Frequently asked questions.
Every question answered across the eme site, on one page. Each answer links to the product page or reference article it comes from.
Which gantry crane, and how heavy is it?
Crane weights, configurations and typical lifts for each capacity class, from the 1/2 ton 1100 Series to the 10 ton 22000 Series.
How much does a 1/2 ton gantry crane weigh?
The eme 1100 Series — a 1/2 ton portable aluminum gantry crane rated 1,100 lb — has a crane weight of roughly 235 lb. It breaks down into components one or two people carry and assemble with two wrenches, two bolts per side; no facility equipment is required.
From 1/2 Ton · 1100 Series→
What is a 1/2 ton gantry crane used for?
Pump pulls, light mechanical work, and rooftop service — the lifts where getting equipment to the work matters more than raw capacity. Like every gantry in the line, it is designed to roll while fully loaded on level, prepared surfaces.
From 1/2 Ton · 1100 Series→
Is 1/2 ton enough, or should I size up?
Size to the heaviest lift with margin, not the average. If loads approach 1,100 lb, the 1 ton 2200 Series shares the same trolley family, so stepping up keeps fleet parts compatible. The capacity selection guide walks the sizing call.
From 1/2 Ton · 1100 Series→
How much does a 1 ton gantry crane weigh?
The eme 2200 Series — a 1 ton portable aluminum gantry crane rated 2,200 lb — has a crane weight of roughly 235 lb. One or two people set it up with two wrenches and two bolts per side, with no facility equipment required.
From 1 Ton · 2200 Series→
What lift heights does a 1 ton gantry crane cover?
Four standard models cover the widest lift-range coverage in the line — from 66 in on the R-8 for shop and service-truck work up to 252 in on the MAX-15 for tall mechanical-room installs.
From 1 Ton · 2200 Series→
What does a 1 ton gantry crane lift?
The majority of pumps, motors, HVAC components, and light-industrial equipment — 1 ton covers the lift most maintenance and contracting crews need most days. If your heaviest loads run past 2,200 lb, step up to the 2 ton 4400 Series, which shares the same trolley family.
From 1 Ton · 2200 Series→
How much does a 2 ton gantry crane weigh?
The eme 4400 Series — a 2 ton portable aluminum gantry crane rated 4,400 lb — has a crane weight of roughly 335 lb and assembles from the ground up with a crew of one to three using standard tools, two bolts per side. Once assembled it works as a mobile gantry crane, rolling on locking casters while loaded on level, prepared surfaces.
From 2 Ton · 4400 Series→
What configurations does a 2 ton gantry crane come in?
Six standard models — the widest configuration spread in the line — with lift heights from 5′6″ to 16′5″ and beam lengths from 5 to 30 ft, so the same 2 ton rating fits a basement mechanical room or a tall industrial bay.
From 2 Ton · 4400 Series→
What is a 2 ton gantry crane used for?
Engine pulls, transmission service, and helicopter MRO component lifts — the workhorse tier of portable lifting. Above 4,400 lb, the 3 & 4 ton 6600/8800 Series is the next step.
From 2 Ton · 4400 Series→
Is there a 4 ton version of this gantry crane?
Yes — the series is offered at 6,600 lb (3 ton) or 8,800 lb (4 ton, the 8800 MAX) on an identical chassis with identical dimensions; the 8,800 lb build weighs 885 lb assembled versus 875 lb. Same footprint, higher rating.
How much does a 3 ton gantry crane weigh?
The eme 6600 Series — a 3 ton portable aluminum gantry crane rated 6,600 lb — has a crane weight of roughly 550 lb and is set up by a four-person crew with standard facility equipment, two bolts per side.
Does the 3 & 4 ton series share parts with other capacities?
It shares its trolley family with the 5 ton 11000 Series, so fleets running both stock one trolley class across the two capacities.
How much does a 5 ton gantry crane weigh?
The eme 11000 Series — a 5 ton portable aluminum gantry crane rated 11,000 lb — has a crane weight of roughly 680 lb and is designed for forklift-assisted ground-up assembly, two bolts per side.
From 5 Ton · 11000 Series→
What spans does a 5 ton gantry crane come in?
Two standard models at the same 11,000 lb rating, differentiated by beam length — a 15 ft span for shorter-span work and a 25 ft span for wider jobsite coverage.
From 5 Ton · 11000 Series→
What is a 5 ton gantry crane used for?
Serious industrial lifting and plant equipment moves where loaded mobility still matters. Below this class, the 3 & 4 ton 6600/8800 Series shares the same trolley family; above it, the 10 ton 22000 Series is the top of the portable aluminum line.
From 5 Ton · 11000 Series→
How much does a 10 ton gantry crane weigh?
The eme 22000 Series — a 10 ton portable aluminum gantry crane rated 22,000 lb, stamped 10 TON / 22,000 LBS on the trolley — has a crane weight of roughly 1,030 lb and is designed for forklift-assisted ground-up assembly, so many jobsites deploy it without a crane truck.
From 10 Ton · 22000 Series→
Is 10 ton the largest portable aluminum gantry crane?
It is the top of the eme line — the flagship, with a dedicated beam and trolley family engineered for 10 ton portable lifting. Above this class, applications generally shift to fixed steel infrastructure.
From 10 Ton · 22000 Series→
Can a 10 ton gantry crane still move while loaded?
Yes — like the rest of the line, it is designed to roll while fully loaded on level, prepared surfaces within the operator manual’s limits, and the floor must be rated for the load.
From 10 Ton · 22000 Series→
What a gantry crane is, rolling under load, trolleys and parts.
What a portable gantry is, what it is made of, what it can do once assembled, and the surface and operator requirements that go with it.
What are the main parts of a gantry crane?
Five structural groups — the beam, the trolley that rides it, two A-frame leg assemblies, the height-adjustment hardware, and the casters — plus the chain hoist that hangs from the trolley and does the lifting. Each part, what it does, and what to check at inspection is covered in gantry crane parts.
From What Is a Gantry Crane? Fixed, Adjustable & Portable Types→
Is a gantry crane the same as an overhead crane?
No. "Overhead crane" usually means a bridge crane running on elevated building rails. A gantry crane is freestanding — its legs carry the load to the floor, so it works in buildings (and outdoor sites) with no crane infrastructure at all.
From What Is a Gantry Crane? Fixed, Adjustable & Portable Types→
How much weight can a portable gantry crane lift?
Portable aluminum gantry cranes span ½ ton (1,100 lb) to 10 ton (22,000 lb) rated capacity. eme's line covers that full range across six series, each load-tested to 125% of rated capacity before shipping.
From What Is a Gantry Crane? Fixed, Adjustable & Portable Types→
Do I need a permit or special foundation for a gantry crane?
Portable gantries need no foundation — they roll on casters over sound, level floor. Fixed rail-mounted gantries require engineered rail foundations and civil work. Workplace requirements (operator training, inspection programs) apply to both under OSHA and provincial regulation; a portable crane arrives with its pre-service load test already documented by the manufacturer.
From What Is a Gantry Crane? Fixed, Adjustable & Portable Types→
What does a portable gantry crane cost compared to a bridge crane?
A bridge crane's true cost includes runway steel, building reinforcement, installation, and permitting — often several times the crane itself. A portable gantry is a single line item with no installation. Where a facility needs occasional lifts in changing locations rather than constant lifts in one aisle, the portable gantry is usually the lower total cost by a wide margin. For a specific configuration, request a quote.
From What Is a Gantry Crane? Fixed, Adjustable & Portable Types→
Is it safe to roll a gantry crane while it's carrying a load?
It is safe when the gantry is specifically engineered and rated for roll-while-loaded service, operated on level prepared surfaces within the manufacturer's documented operational limits, with appropriate caster options for the surface. It is not safe when the gantry is not rated for the service. Always consult the operator manual.
Why can't all gantry cranes roll while loaded?
Rolling under load requires caster ratings, structural design, and documentation specifically developed for in-motion service. Static-only gantries may have casters rated only for standing loads, frame geometry not engineered for in-motion stability, or operator manuals that explicitly prohibit rolling under load. Most steel gantries and most cheap imported portable gantries fall into this category.
Can an eme gantry roll at its full rated capacity?
Yes. Every eme portable aluminum gantry is designed to be rolled at its full rated capacity on level, prepared surfaces. This is a core design specification of the gantry line, not an add-on or a limited service.
What kind of surface do I need to roll a loaded gantry on?
Level, prepared, and capable of supporting the caster load. Concrete shop floors in good condition are the standard. Surface irregularities (expansion joints, cracks, level transitions), slopes, and rough surfaces reduce rolling safety and may require specialty casters or disqualify rolling entirely. Consult the operator manual for your specific model.
Do I need a certified operator to roll a loaded gantry?
Operator training and competency requirements follow the same framework as any crane operation under ASME B30.17 — the operator must be trained on the specific equipment and competent in the operating procedures. Rolling under load is covered in the eme operator manual.
What are the risks of rolling a loaded gantry that isn't rated for it?
Risks include: caster failure under dynamic loading, tip-over from side loads or surface irregularities, structural fatigue in components not designed for in-motion service, and loss of load control. A gantry not rated for roll-while-loaded service should not be rolled with a load — full stop.
Can you roll a gantry crane up or down a slope?
In general, no. Rolling a loaded gantry requires a level surface. Slopes introduce lateral loads, rolling dynamics, and potential for runaway motion that most rolling-rated gantries are not engineered to handle safely. Consult the specific operator manual; assume "no" unless the manual explicitly permits slope operation with defined limits.
How fast can you roll a loaded gantry?
Walking pace, typically. Rolling a loaded gantry is a controlled procedure, not a transportation method. Higher speeds introduce momentum, dynamic loading, and control issues that reduce safety. Consult the operator manual for specific speed guidance.
What are the main parts of a gantry crane?
Five structural groups — beam, trolley, two A-frame leg assemblies, height-adjustment hardware, and casters — plus the chain hoist that hangs from the trolley and does the lifting. On portable aluminum gantries the structure assembles from these components with hand tools.
Does a gantry crane come with the trolley?
A complete eme crane configuration includes the beam and its matched trolley — the trolley is part of the crane, not a separate accessory. The hoist is separate equipment, sized to the crane's rated capacity.
What part of a gantry crane carries the load?
The whole load path does: hook to hoist, hoist to trolley shackle, trolley to beam, beam into the legs, legs into the casters and floor. A crane is rated as a system — which is why every eme unit is load-tested to 125% of rated capacity as an assembled crane, not as parts.
Can I use an eme trolley on another beam?
No. eme trolleys are profile-specific — the surround-beam geometry is machined to eme's proprietary box extrusions and is sold only as part of an eme gantry configuration. A trolley matched to its beam is a load-path pairing, not a universal accessory.
From What Is a Beam Trolley? The Surround-Beam Design Explained→
Does a gantry crane come with a trolley?
A complete eme crane configuration includes the beam and its matched trolley. The hoist hangs from the trolley's shackle and is purchased separately, sized to the crane's rated capacity.
From What Is a Beam Trolley? The Surround-Beam Design Explained→
What's the advantage of a surround-beam trolley?
It's captive: because the trolley wraps the beam and rides on top, there's no bottom flange for a wheel to walk off — the trolley cannot leave the beam in service. Positioning works the same as any push trolley; the security is structural, not procedural.
From What Is a Beam Trolley? The Surround-Beam Design Explained→
Is an A-frame crane the same as a gantry crane?
Yes — "A-frame crane" describes the leg shape of a portable gantry crane. The formal taxonomy (full vs. semi, fixed vs. adjustable, portable vs. rail-mounted) is covered in types of gantry cranes; nearly every portable gantry you'll see uses A-frame legs.
How much can an A-frame crane lift?
Portable A-frame gantries commonly run from 1/2 ton to 10 ton. The eme line spans 1,100 lb to 22,000 lb, every unit load-tested to 125% of rated capacity before shipment with a Certificate of Test.
Can you move an A-frame crane while it's loaded?
Only on a crane designed and rated for it, on level, prepared surfaces, within the operator manual's limits — and the floor must be rated for the load. Every eme gantry is engineered to roll while fully loaded under those conditions.
Running more than one crane.
How beams, trolleys and leg sets interchange across the line, and how fleet pricing works.
Does the rated capacity drop when I put a longer beam on the same legs?
No. The rating belongs to the leg set. A 2200 on a 30 ft 3×12 beam is rated 2,200 lb; a 4400 is rated 4,400 lb. The beam profile is chosen so the beam carries that rating at the span, and every configuration ships on an engineer-stamped drawing.
From Fleet Standardization→
Which eme gantry series share trolleys?
Trolleys follow the beam profile, not the series. Any leg set on a 3×6 beam runs the 2-roller trolley (1100, 2200, 4400). Any leg set on a 3×12 runs the 4-roller (2200 and 4400 on long spans; 6600, 8800 and 11000 as standard). The 3×15 takes its own 4-roller, or the 22000's 8-roller. The 22000 runs the 8-roller on its own beam.
From Fleet Standardization→
Can I move a beam from one leg set to another?
Yes. Every set of legs within a capacity class can use the same beam: a 4400 beam fits any 4400 leg set in the fleet. Beams do not move across classes. A 25 ft 3×15 rated to 11,000 lb for the 11000 is not put into 6600 legs. What carries across classes is the beam profile and the trolley.
From Fleet Standardization→
Can I add a 3×15 beam to a 6600R or 11000R I already own?
Ask. The 6600R and 11000R take 3×15-specific cheek plates, so the beam is quoted with the legs it will run on. Send the leg set and the span you need and eme will quote it.
From Fleet Standardization→
Is there fleet pricing?
Fleet and volume pricing is quoted. Send the capacity classes you run, the spans you see, and the number of sites or branches, and eme will spec the leg sets, the beam and trolley pool, spares and transport frames with it.
From Fleet Standardization→
ASME B30.17, ASME BTH-1 and CSA W47.2.
What each standard covers, what "designed to" means in a spec, and what documentation to ask any manufacturer for.
Is ASME B30.17 the same as ASME B30.2?
No. B30.2 covers top-running bridge and gantry cranes with top-running trolley hoists, but the standard's scope assumes a fixed runway with dedicated rails — permanent installations. It does not apply to portable, caster-mounted gantries like eme's, which have no runway. eme's portable aluminum gantries are designed to ASME B30.17 (the closest-scoped B30 volume), with engineering judgment supplied for the portable configuration that the B30 framework doesn't fully cover. They are separate volumes with different scopes.
From What is ASME B30.17?→
Is ASME B30.17 required by law?
ASME B30.17 itself is a voluntary consensus standard, not a law. However, OSHA regulations in the United States (and provincial regulations in Canada) frequently reference ASME B30 series standards as the accepted engineering practice for crane safety. A jurisdiction, employer, insurer, or jobsite may require ASME B30.17 compliance as a condition of operation.
From What is ASME B30.17?→
Does ASME B30.17 apply to aluminum gantry cranes?
ASME B30 standards apply based on a crane's configuration, not its construction material. eme's portable aluminum gantry cranes are top-running single-girder box-beam cranes designed to ASME B30.17 (comprehensive single-girder provisions), with CSA S157 for structural aluminum applied on top and structural welds produced by a company certified by CWB to CSA W47.2.
From What is ASME B30.17?→
How do I verify that a manufacturer's crane actually meets ASME B30.17?
Request the documentation. A compliant manufacturer will provide: engineer-stamped structural drawings, a Certificate of Test showing the rated-capacity load test result (often 125% of rated load), the operator's manual with B30.17-aligned procedures, and the applicable ASME B30.17 edition year the equipment is designed to. If the manufacturer cannot produce this documentation, treat the compliance claim with skepticism.
From What is ASME B30.17?→
What is the design factor under ASME B30.17?
B30.17 itself addresses the crane system. For below-the-hook lifting devices attached to the crane (spreader beams, lifting beams, custom attachments), ASME BTH-1 applies — typically Category B for portable applications, with a 3:1 design factor on yield stress for load-carrying members.
From What is ASME B30.17?→
Is every eme gantry evaluated against ASME B30.17?
Yes. Every eme aluminum gantry crane — a top-running single-girder box-beam design — is designed to ASME B30.17, load-tested to 125% of rated capacity with a load cell before shipping, and shipped with a Certificate of Test and engineer-stamped drawing. Documentation is included with the equipment; additional copies are available on request.
From What is ASME B30.17?→
Is ASME BTH-1 the same as ASME B30.20?
No — they are companion standards that address different lifecycle phases. BTH-1 is the design standard for below-the-hook devices. B30.20 is the operation, inspection, and maintenance standard. A below-the-hook device should be designed to BTH-1 and operated per B30.20. Both are voluntary consensus standards under the ASME B30 series framework.
From What is ASME BTH-1?→
What does "below-the-hook" mean?
A below-the-hook lifting device is anything that attaches between a crane's load hook and the load being lifted. Spreader beams, lifting beams, plate clamps, magnets, vacuum lifters, coil grabs, C-hooks, and custom attachments are all below-the-hook devices. The crane, hook, and sling are not below-the-hook devices — they have their own standards (B30.17, B30.10, B30.9 respectively).
From What is ASME BTH-1?→
What is the design factor on a BTH-1 Category B device?
3:1 on the yield stress of load-bearing members. This means a Category B device with a 5,000 lb rated capacity is engineered to handle 15,000 lb of applied load before the load-bearing members reach yield stress, with additional margin before ultimate failure.
From What is ASME BTH-1?→
Why Category B instead of Category A?
Category A (2:1 design factor) applies to controlled environments with predictable loading — fixed facilities with dedicated equipment and trained operators. Category B (3:1 design factor) applies to more severe service with variable loading, multiple operators, and potential for shock loads. Portable industrial lifting equipment almost always uses Category B because the service pattern (multiple jobsites, different operators, occasional shock loading) matches the Category B profile.
From What is ASME BTH-1?→
What BTH-1 category and design factor does Eagle Beam use?
Eagle Beam is designed to ASME BTH-1 Category B with a 3:1 design factor on yield stress — the more conservative of the two BTH-1 categories, appropriate to portable, variable-operator, multi-jobsite service.
From What is ASME BTH-1?→
What standard applies to the eme gantry crane itself?
The gantry crane is covered by the crane standards, not BTH-1 (BTH-1 applies to below-the-hook lifting devices like spreaders and lifting beams, not the crane itself). eme's gantries are top-running single-girder box-beam cranes, designed to ASME B30.17. Every eme gantry is load-tested to 125% of rated capacity before shipment, with a Certificate of Test.
From What is ASME BTH-1?→
What eme product is a below-the-hook lifting device?
The Eagle Beam aluminum lifting beam is eme's only below-the-hook lifting device. It is designed to ASME BTH-1 Category B with a 3:1 design factor. Other eme accessories (spreader beams, Split Beam, Cantilever Option, Grip Eye, cable holder, pneumatic casters, transport frames) are not classified as below-the-hook lifting devices under eme's product architecture — they serve other roles in the lifting system.
From What is ASME BTH-1?→
Is BTH-1 legally required?
BTH-1 is a voluntary consensus standard, not a law. However, OSHA regulations in the United States (and provincial regulations in Canada) frequently reference ASME standards as the accepted engineering practice for lifting equipment. A jurisdiction, employer, insurer, or jobsite compliance officer may require BTH-1 compliance as a condition of use.
From What is ASME BTH-1?→
Does BTH-1 apply to gantry cranes?
BTH-1 applies to below-the-hook devices — the attachments between a crane's hook and the load. The gantry crane itself is covered by the crane standard: eme's top-running single-girder box-beam gantries are designed to ASME B30.17. The hook is covered by B30.10. The slings are covered by B30.9. A lifting beam or spreader beam hung from the gantry's hook is the device BTH-1 applies to.
From What is ASME BTH-1?→
What's the difference between BTH-1 Category A and Category B design factors?
Category A uses a 2:1 design factor on yield stress; Category B uses 3:1. The higher factor for Category B reflects the more severe service pattern — higher frequency, multiple operators, variable loading, potential for shock. The practical effect is that a Category B device is more conservatively sized than a Category A device of the same rated capacity.
From What is ASME BTH-1?→
Is CSA W47.2 a Canadian-only standard?
Yes — CSA W47.2 is a Canadian standard issued by CSA Group and administered by the Canadian Welding Bureau. It is a Canadian-market compliance instrument; US market compliance is satisfied through ASME, OSHA, and AWS standards. That said, W47.2 certification is widely recognized in the United States as a quality signal for aluminum welding specifically. It is not required for a US buyer to accept a product, but its presence meaningfully differentiates the manufacturer from the pro-sumer and offshore tiers. In short: required in Canada, optional-but-credibility-building in the US.
From What is CSA W47.2?→
Does W47.2 apply to individual welds or to the whole company?
W47.2 certifies the company's welding capability — its procedures, welders, supervisors, and quality systems. It does not certify individual welds or individual products. The expectation is that a W47.2-certified company produces welds meeting its qualified procedures, and its internal quality system catches and addresses any that don't.
From What is CSA W47.2?→
What's the difference between W47.1 and W47.2?
W47.1 covers fusion welding of steel. W47.2 covers fusion welding of aluminum. The standards are structurally similar (same kind of procedure/welder/supervisor qualification framework), but the technical requirements reflect the different metallurgy, consumables, and inspection methods of each base metal. A company certified under W47.1 is not certified for aluminum welding — and vice versa.
From What is CSA W47.2?→
Is W47.2 required by law for aluminum lifting equipment?
Not universally. Some jurisdictions, insurers, and purchasers require W47.2 as a condition of supply, purchase, or operation. Others treat it as a quality benchmark without making it mandatory. In practice, serious industrial buyers of aluminum lifting equipment increasingly expect the certification, and its absence is a meaningful red flag.
From What is CSA W47.2?→
How is CSA W47.2 different from ASME B30.17?
ASME B30.17 is a design standard for cranes and monorails — a manufacturer builds its equipment to B30.17's requirements and self-declares compliance. CSA W47.2 is a third-party certification for aluminum welding — the Canadian Welding Bureau independently evaluates the certified welding operation and issues the certification. Both apply to aluminum gantry cranes; they address different aspects (structural design vs. welding). A well-built aluminum gantry is designed to B30.17, with every structural weld produced by a company certified by CWB to CSA W47.2.
From What is CSA W47.2?→
Are eme products welded by a company certified by CWB to CSA W47.2?
Yes — with one nuance. Every structural weld on an eme aluminum gantry or davit is produced by a company certified by CWB to CSA W47.2. The Eagle Beam aluminum lifting beam is a separate case: it uses an all-bolted construction with Grade L9 fasteners, with no welded joints in the load-bearing structure — so W47.2 does not apply to the beam itself, because the beam has no production welds to certify. This is an intentional design choice that eliminates welding-related quality risk from the lifting-beam product line entirely. Documentation for both the welding certification covering gantries and davits, and the bolted-construction specifications on Eagle Beam, is available on request.
From What is CSA W47.2?→
The 125% test, the Certificate of Test and 6061-T6.
How every rated unit is proof-tested before it ships, and why the structure is 6061-T6 aluminum.
What percentage of rated capacity is used for a proof load test?
Typically 125% of rated capacity for portable industrial gantry cranes. This is the industry-standard proof-load percentage that verifies the design factor is intact while remaining below a level that would cause damage during testing.
Do I need to load-test a new crane before using it?
OSHA 1910.179(k)(2) puts a crane's rated-load test at 125% of rated capacity unless the manufacturer specifies otherwise — the regulation's ceiling, and the level OSHA ties to rating a crane at 100% of its design intended loading. eme completes a 125% proof-load test on every crane and ships a Certificate of Test documenting it, so the pre-service proof test is already done and documented when the crane arrives, and a separate end-user load test is typically not needed for initial acceptance. Some jurisdictions or specific employer programs may require additional testing; check your local and facility-specific requirements.
Who can perform a load test?
The initial (manufacturing) test is performed by the manufacturer. Post-repair and periodic tests may be performed by the manufacturer, a qualified third-party inspection service, or the end user's qualified personnel, depending on jurisdictional requirements and the owner's program. The test must be documented by a qualified person using calibrated measurement equipment.
How long does a gantry crane load test take?
For a portable aluminum gantry at the manufacturing level, the load test typically takes 30 minutes to two hours including setup, test execution, inspection, and documentation. Periodic in-service load tests have similar duration.
What's the difference between a load test and a daily inspection?
A daily or pre-use inspection is a visual and functional check performed by the operator — confirming the crane looks correct, brakes and controls operate, no visible damage, proper setup on the surface. A load test is a formal proof-load application with documented results. Daily inspections happen every time the crane is used; load tests happen at manufacturing, after repair, and on periodic intervals.
What happens if a crane fails a load test?
The crane is removed from service. The failure mode (structural deformation, hoist malfunction, control anomaly, brake slippage) is investigated. Repairs are made, and the crane is re-tested before being returned to service. A manufacturing-level load-test failure triggers investigation of the production process; a service-level failure triggers investigation of the specific unit and often a review of the service history.
What is a load cell?
A load cell is a calibrated transducer that measures force. Most load cells produce an electrical signal proportional to the applied force; the signal is read by an indicator or data recorder and converted to a force measurement (in pounds or kilograms). Load cells are the standard measurement tool for proof-load testing — they are more accurate and more repeatable than deadweight-only testing methods.
How do I verify that a manufacturer's load test was done correctly?
Request the Certificate of Test. A properly documented test will specify the crane's serial number, the rated capacity, the proof load applied (typically 125%), the date of the test, the load cell used and its calibration traceability, and any observations or measurements. If the Certificate is vague, lacks serial-number traceability, or doesn't specify the proof load applied, the documentation is insufficient.
Does the load test damage the crane?
A properly performed proof load test does not damage a properly designed crane. The 125% proof load is well below the crane's ultimate capacity and consumes a minimal portion of the crane's fatigue life. Over-testing (applying higher-than-specified loads) can consume fatigue life or cause damage; follow the manufacturer's specified proof load and procedure.
What does the "6061" in 6061-T6 aluminum stand for?
The "6061" is an Aluminum Association alloy designation. The leading "6" indicates the 6xxx series (alloys with magnesium and silicon as primary alloying elements). The remaining three digits identify the specific composition within the series. "6061" is a specific aluminum-magnesium-silicon alloy composition that balances strength, corrosion resistance, and workability.
What does "T6" mean?
"T6" is a temper designation meaning the alloy has been solution heat-treated and artificially aged. The heat treatment process produces the alloy's structural strength. T6 is the standard temper for structural applications of 6061 aluminum because it yields the highest strength.
How strong is 6061-T6 aluminum?
Typical mechanical properties for 6061-T6: - Yield strength: ~40,000 psi (275 MPa) - Ultimate tensile strength: ~45,000 psi (310 MPa) - Elongation at break: ~12%
These are Aluminum Association published values for the general-purpose form. Specific supplier lots may vary slightly.
Is 6061-T6 strong enough for a gantry crane?
Yes. 6061-T6 is the standard structural alloy for portable aluminum gantry cranes, engineered to support rated capacities from 1,100 lb to 22,000 lb under ASME B30.17 (gantry cranes) and, where applicable, ASME BTH-1 Category B for below-the-hook lifting beams. The concern that aluminum "is not strong enough" for lifting reflects unfamiliarity with structural aluminum, not a limitation of the material. Aluminum is used in aircraft, bridges, and critical load-bearing applications across industry.
Can 6061-T6 be welded?
Yes. 6061-T6 is weldable using fusion processes (GMAW/MIG and GTAW/TIG) with appropriate aluminum filler alloys — 4043 or 5356 are standard choices. Welding reduces the strength of 6061-T6 in the heat-affected zone, which the structural designer accommodates in load calculations. Aluminum welding is technically different from steel welding — different filler metals, different joint preparation, different heat management — and should be performed by certified aluminum welders. In Canada, CSA W47.2 is the certification framework; eme's gantry and davit structural welds are produced by a company certified by CWB to CSA W47.2.
Does 6061-T6 corrode?
6061-T6 is highly corrosion-resistant in most environments. It forms a self-healing oxide layer on exposure to air that protects the underlying material. It performs well in wet, chemical, marine, and outdoor environments without paint or coatings. In extreme or specialized corrosive environments (certain industrial chemicals, direct contact with dissimilar metals without isolation), additional protection may be warranted, but for typical industrial and outdoor applications the alloy's native corrosion resistance is sufficient.
Is 6061-T6 safe for food-contact applications?
6061-T6 itself is not specifically a food-contact material, but aluminum alloys are used in many food-industry applications where direct contact is isolated or the application does not involve direct product exposure. For specific food-contact design, consult the applicable FDA or equivalent regulatory guidance.
Where else is 6061-T6 used?
Extensively. Aerospace (aircraft frames, fuselages, wings), transportation (trucks, trailers, rail), marine (ship superstructures, small craft), bridges and infrastructure, structural construction, pressure vessels, bicycles, specialty machinery, and industrial lifting equipment. The alloy's engineering pedigree spans more than half a century of structural use.
Socket-mounted lifting.
How a davit and socket network works, what it lifts, and where it fits next to a gantry.
What is the difference between a davit and a crane?
A davit crane is a crane — the term names a configuration, not a separate class of machine. Specifically it's a single-mast, socket-mounted crane that swings its load in an arc, as opposed to a gantry (two legs, load travels along a beam) or a bridge crane (runway rails overhead).
From What Is a Davit Crane? Socket-Mounted Lifting Explained→
Are there lightweight davit cranes for easy transport?
Yes — that's the main argument for aluminum. eme's 1100 Series is 38 lb and its 2200 Series is 43 lb, both light enough for one person to carry between sockets and install without tools. Steel davits at comparable capacities are generally a two-person or equipment-assisted lift.
From What Is a Davit Crane? Socket-Mounted Lifting Explained→
What are the best materials for davit cranes in corrosive environments?
Aluminum is the usual answer for wastewater, washdown, coastal, and chemical exposure — it doesn't rust, and there's no coating to chip and undercut. eme davits are built from 6061-T6 aluminum; see what is 6061-T6 aluminum? for why that alloy specifically. Where the environment is aggressive enough to attack the anchoring hardware too, stainless socket hardware is the usual companion specification.
From What Is a Davit Crane? Socket-Mounted Lifting Explained→
Can a davit crane rotate while carrying a load?
Rotating the load around the mast is the davit's normal working motion — that's how the load gets from over the hatch to over the truck. What matters is that rotation stays smooth and controlled rather than jerking, and that the load stays within the rated capacity for the radius it's at. Operating limits are in the manual for the specific model.
From What Is a Davit Crane? Socket-Mounted Lifting Explained→
How do you select the right davit crane for a load?
Four inputs: the weight of the heaviest load, the working radius from mast centerline to load, the mounting condition at each lift point (deck, wall, flush floor), and how many lift points the crane needs to serve. Those four determine crane model, socket family, and how many sockets to anchor. Send the geometry to eme and you'll get a configuration back rather than a catalog.
From What Is a Davit Crane? Socket-Mounted Lifting Explained→
Renting through the authorized network.
What the network carries, how a request moves, what ships with a rental, and when buying makes more sense.
Can I rent a 5 ton or 10 ton gantry crane?
Yes. The network rents eme portable aluminum gantry cranes from 1/2 ton (1,100 lb) up to 10 ton (22,000 lb). The 11000 Series covers 5 ton lifts and the 22000 Series covers 10 ton lifts. Put the capacity in the form and we'll confirm a partner near your jobsite carries it before we make the introduction.
From Rental Network→
How does the eme rental network work?
You submit a request and an eme rental specialist reviews it. We may reach out directly to better understand your project — capacity, timeline, jobsite conditions, regulatory requirements — so we can suggest the right partners. Within one business day, you'll receive a list of authorized partners that fit your request, and you choose who to work with.
From Rental Network→
What equipment is available to rent through the network?
The authorized rental network carries aluminum gantry cranes (1,100 to 22,000 lb capacity), Eagle Beam aluminum lifting beams, and accessories — pneumatic casters, extra trolleys, different beam sizes, cantilever options, and transport frames.
Davit cranes are sold direct, not through the rental network. If you need a davit, see the davit page or talk to eme directly.
From Rental Network→
What happens after I submit the form?
You'll see a confirmation message immediately. An eme rental specialist reviews your request — region, project type, capacity, timeline — and may follow up with you directly if we need more detail to suggest the right partners. Within one business day, you'll receive a list of authorized partners in your area that fit your project. From there, you choose who to work with.
From Rental Network→
What documentation comes with the rental?
Every eme rental ships with: Certificate of Test (load-tested at 125% of rated capacity), engineer-stamped drawings, the operating manual for the specific model, and crane dimensions. This documentation is a hard requirement for regulated worksites — ports, utilities, nuclear facilities, refineries — and our partners ship it as standard, not as an add-on.
From Rental Network→
Can eme equipment be used at nuclear, utility, port, and other regulated worksites?
eme equipment ships with the documentation commonly required for regulated-site review — Certificate of Test, engineer-stamped drawings, operating manuals, and model dimensions. eme gantries are designed to ASME B30.17, CSA B167, the Aluminum Design Manual (ADM), and CSA S157; davits to the same engineering framework, with a design factor on yield stress well in excess of the proof-test load; Eagle Beam lifting beams to ASME BTH-1 Category B and ASME B30.20. All structural welds are produced by a company certified by CWB to CSA W47.2.
Site-specific requirements — nuclear QA, material traceability, utility-specific procedures, customs paperwork for cross-border jobs, or other owner-specific documentation — should be confirmed before rental or purchase. Tell us what your site requires in the form and we'll confirm with the partner before the introduction.
From Rental Network→
Can I rent for a single day, or is there a minimum period?
Rental terms — minimums, daily/weekly/monthly rates, deposits, delivery fees — are negotiated directly with the partner once we make the introduction. Most authorized partners offer flexible periods with discounts at longer durations. eme sets baseline service expectations across the network, but pricing is between you and the partner.
From Rental Network→
Who do I contact if there's an issue during the rental?
Your first call is to the rental partner — they'll respond fastest because they have the equipment, the parts, and the local knowledge. If the partner can't resolve the issue, eme is the factory backstop: engineering escalation, warranty support, and direct technical answers from the people who designed the equipment. Every authorized partner has the eme support line at hand.
From Rental Network→
When does it make sense to buy instead of rent?
Renting fits one-off projects, jobs in unfamiliar regions, and capacity you only need occasionally. Buying fits when your annual rental spend exceeds about a third of the purchase price, or when you need on-demand availability without coordination.
If you're not sure which way the math goes, talk to eme — we'll give you a straight read on your operation. We're not trying to push you one direction; either path keeps the relationship.
From Rental Network→
Origin, Buy Canadian and Buy Ontario.
Where the aluminum comes from, where the crane is built, and how to cite it in a domestic-supply plan.
Is the whole crane made in Canada?
The structure is. Aluminum is smelted in Canada and extruded, machined, welded, powder-coated and assembled in Ontario. Casters and fasteners are imported, which is why the claim is Made in Canada with domestic and imported parts.
From Made in Canada→
Is the aluminum Canadian?
Yes. It is smelted in Canada and extruded in Ontario. All eme structural aluminum is 6061-T6.
From Made in Canada→
Does an eme crane qualify under the Buy Ontario Procurement Directive?
eme is an Ontario-based manufacturer producing in Ontario, not a distributor of imported equipment. Confirm the specific requirements with your procurement office; we can supply a supplier attestation on request.
From Made in Canada→
Can a general contractor cite eme in a federal Buy Canadian domestic supply chain plan?
Yes. The federal Buy Canadian Policy requires aluminum used in federal contracts to be Canadian-produced. eme aluminum is smelted in Canada and extruded in Ontario. We can provide origin documentation for the bid.
From Made in Canada→
Where in Ontario?
Southern Ontario. Facility visits by appointment — contact us.
From Made in Canada→
Question not here?
Tell us the load, lift height, span and jobsite. An engineer answers within one business day.