Capacity, span, headroom and building structure โ the four decisions that separate a suspension crane that pays for itself from one that fights your roof for years. Written for buyers in low buildings who want the floor space, not a sales pitch.
A suspension crane is the right choice when you need overhead lifting in a low building, want to keep the floor completely free of columns, and your regular loads stay under 5 tons: the underslung track hangs from the roof structure instead of standing on floor columns, which is why assembly lines, warehouses, electronics and pharmaceutical plants pick it. It is not a smaller version of a top-running crane โ it is a different sizing problem, because the building roof, not the crane itself, sets the real limits. Capacity, span, headroom and duty class each follow a simple rule: start from your heaviest regular load, measure the roof structure rather than the floor, and match the duty class to actual hours of use. This guide walks through each decision with typical ranges (0.25-5 tons capacity, 3-16 m span, 3-12 m lift height, A3-A5 duty classes) and closes with a specification template you can send to any supplier for an accurate quote.
Capacity is where buyers overshoot more often than with any other crane type. The reason is simple: a suspension crane's load is carried by the roof. Every extra ton means heavier track, stronger brackets and more load on the building frame, so oversizing costs you twice: once in the crane, once in the structure.
Start with the heaviest single item you move on a regular basis. Not the one-off job โ the regular one. Then apply the standard margin: sizing to at least 125% of that load covers the load test requirement and leaves room for slings and spreader beams. A 2-ton suspension crane routinely lifting 1.8-ton dies is working near its test limit, and that is a structure problem waiting to happen, not just a duty problem.
| Capacity | Typical regular loads | Where it fits |
|---|---|---|
| 0.25 - 0.5 t | Small parts, tooling, light subassemblies | Electronics assembly, precision instrument shops, small workstations |
| 1 t | Pumps, motors, packaged goods to 0.8 t | Light manufacturing, warehouse picking, packaging lines |
| 2 - 3 t | Engines, transmissions, molds to 2.4 t | Automotive assembly, machine shops, pharmaceutical production |
| 5 t | Heavy machine components to 4 t | Upper practical limit for roof-mounted tracks, food & beverage plants |
If your heaviest regular load is over 4 tons, stop and question the suspension route. Above 5 tons the roof structure almost always needs reinforcement that eats the cost advantage, and a single girder top-running crane with its own runway usually becomes the cheaper answer. Suspension cranes win in the 0.25-5 ton zone โ that is their home turf, and that is where the economics work.
Span for a suspension crane is the distance between the runway track centerlines, measured where the trolley runs. It should match your building bay (typically the distance between roof trusses or main frames), not the building width. Measure the actual support points in millimeters so there is no ambiguity with the manufacturer.
Standard suspension cranes cover spans from 3 to 16 meters. Because the track hangs from the roof and is supported at multiple points, deflection is normally controlled to span/500 to span/700, more relaxed than a top-running crane and fine for the light, precise positioning these machines do. Beyond 16 meters, the track weight and bracket loads climb quickly, and a top-running crane starts to look better.
Lift height is the vertical distance from the floor to the hook at its highest position. Suspension cranes deliver 3 to 12 meters, and the number is set by the building, not by choice: the track sits at roof level, so hook travel is whatever the roof height gives you minus the crane profile. In a low mezzanine or a 5-meter workshop, that might mean 3 meters of usable lift โ perfectly fine for workstation feeding, useless for stacking. Measure from the floor to the underside of the roof structure, subtract the crane dimensions plus hook path clearance, and you have your real lift height. Do not try to force more; there is no column to raise.
This is the question nobody asks early enough, and it is the one that decides whether the project sails through or dies in the structural review. A suspension crane is only as good as the roof it hangs from.
The track mounts to purlins, trusses or roof beams, and each suspension point must carry its share of the crane weight plus the rated load plus dynamic impact. In our field experience across more than 150 installations, roughly 68% of suspension crane problems trace back to track mounting details on the roof structure: bracket spacing, connection bolts, or assuming a purlin is stronger than it is. That is why every responsible supplier asks for a building drawing before quoting.
| Check | Why it matters |
|---|---|
| Roof structure type and member sizes | Purlins, trusses and beams carry load very differently; sizes determine what the roof can hold |
| Suspension point spacing | Closer spacing spreads the load but adds brackets; wider spacing needs stronger members |
| Connection bolts and brackets | Most mounting failures start at the connection, not the track itself |
| Existing roof condition | Corrosion or previous modifications reduce the structure's real capacity |
| Structural engineer sign-off | Required for the load test certificate and for your insurance in most regions |
Send the supplier a simple roof cross-section โ member layout, sizes, spacing, roof level. It costs nothing to attach and it removes more guesswork than any written description. For the full inspection and compliance picture, our suspension crane safety & compliance guide covers the checklists and standards in detail.
Duty class tells you how many hours a day the crane can work and how often it can lift near its rated load. Suspension cranes are built light to protect the roof structure, so they stay in the light-to-medium classes โ and that is a design decision, not a quality difference.
| Duty class | Working hours / day | Typical applications |
|---|---|---|
| A3 | A few hours, occasional lifts | Maintenance bays, light assembly, tool rooms |
| A4 | 4 - 8 hours | Assembly lines, warehouse picking, packaging |
| A5 | 8 - 16 hours | Automotive component lines, high-throughput production |
A quick way to think about it: a maintenance shop that lifts a few times a day is A3. A packaging line running one shift is A4. An automotive component line feeding presses all day is A5. If you need more than 16 hours a day of continuous work with heavy lifts, the honest answer is a top-running crane โ pushing an A5 suspension crane past its design duty shortens its life and loads the roof harder than the structure was sized for.
Both work on suspension cranes; the choice comes down to lift height, speed and how often the hoist runs. There is no universal winner โ there is a fit.
| Factor | Chain hoist | Wire rope hoist |
|---|---|---|
| Typical capacity | 0.25 - 5 t | 0.5 - 5 t (up to 20 t in double girder form) |
| Lift height | Up to ~8 m standard | Up to 12 m and beyond |
| Lifting speed | Slower, single speed typical | Faster, two-speed or variable speed common |
| Headroom profile | Compact โ good for very low buildings | Slightly taller hoist profile |
| Price | Lower, typically 15-25% less | Higher |
For light assembly workstations with short lifts and tight headroom, a chain hoist is usually the sensible pick โ cheaper, compact, and plenty for the job. For longer lifts, faster cycles or heavier loads at the top of the range, a wire rope hoist earns its extra cost. If you are comparing hoists across crane types, our suspension crane guide covers the specification differences in more depth.
Prices below are 2026 FOB estimates for CE-certified Chinese suspension cranes with hoist, controls and electrification, excluding track, brackets, freight and installation. Expect total installed cost to run roughly 30-60% above the equipment price โ the roof-mounted track work is simpler than a full runway on columns, which is one reason suspension cranes beat top-running units on total project cost.
| Configuration | Equipment price (FOB) | Typical installed total |
|---|---|---|
| 0.5 t, 6 m span, chain hoist | USD 3,000 - 4,000 | USD 4,000 - 6,500 |
| 1 t, 8 m span, chain hoist | USD 3,500 - 5,000 | USD 5,500 - 8,500 |
| 2 t, 10 m span, wire rope hoist | USD 5,500 - 7,500 | USD 8,500 - 12,000 |
| 3 t, 12 m span, wire rope hoist | USD 8,000 - 11,000 | USD 12,000 - 17,000 |
| 5 t, 12-16 m span, wire rope hoist | USD 12,000 - 22,000 | USD 19,000 - 35,000 |
Two notes on comparing quotes. First, confirm every supplier quotes the same duty class and hoist type โ a 2-ton wire rope hoist unit costs more than a 2-ton chain hoist unit, and comparing them as if they were the same machine will mislead you. Second, ask what is included: some prices cover the crane only, others include track, brackets and installation. Our suspension crane cost & 10-year TCO guide breaks down installation, maintenance and energy costs in detail, including the 19-30% lifetime saving versus top-running single girder cranes.
A vague enquiry gets a vague quote. A complete specification gets comparable quotes โ and saves you from paying for a change order later. Send every supplier the same ten items:
If you plan to run multiple cranes on the same runway, say so in the enquiry โ multi-crane systems on shared tracks are a suspension crane specialty, and the supplier needs to design the electrification and anti-collision logic from the start, not bolt it on later.
Start from your heaviest regular single load, multiply by at least 1.25 to cover the load test margin, and round up to a standard capacity. 0.25-0.5 tons covers small parts handling, 1 ton light manufacturing and warehousing, 2-3 tons automotive and pharmaceutical work, 5 tons the practical ceiling for roof-mounted tracks. Above 5 tons, a top-running crane is usually the better choice.
Standard suspension cranes cover spans from 3 to 16 meters, with the practical limit set by the roof structure rather than the crane. Deflection is normally controlled to span/500 to span/700 because the track hangs from multiple roof suspension points. Beyond 16 meters, track weight and bracket loads climb quickly and a top-running crane becomes more attractive.
Yes โ that is a core advantage of the design. The track mounts to the roof structure with no floor columns, so it retrofits into existing buildings. The condition is structural verification: purlins, trusses or roof beams must carry the crane plus rated load at every suspension point, and roughly 68% of installation problems in our experience trace back to track mounting details. Lifting height is limited to 3-12 meters because the track sits at roof level.
A3 for occasional lifting of a few hours per day, A4 for regular single-shift work of 4-8 hours, A5 for continuous medium work of 8-16 hours. Suspension cranes are deliberately built in light-to-medium classes to protect the roof structure. For continuous heavy duty beyond 16 hours a day, a top-running crane with its own runway is the honest recommendation.
Equipment prices run USD 3,000-22,000 FOB for CE-certified units from 0.5 to 5 tons. A 1-ton, 8-meter span unit is about USD 3,500-5,000; a 2-ton, 10-meter span unit about USD 5,500-7,500; a 5-ton, 12-16 meter span unit about USD 12,000-22,000. Installed totals add roughly 30-60% for track, brackets, electrification and installation, and 10-year total cost of ownership typically lands 19-30% below an equivalent top-running single girder crane.
Send us your roof cross-section, heaviest load and operating hours โ our engineering team will verify the structure and confirm the right capacity, span and duty class before you commit to anything. Quotes include a full specification sheet you can compare with other suppliers.
Request a Quote View Suspension Crane ProductsRelated articles:
Suspension (Underslung) Crane Guide: Specs, Prices & Applications (2026)
Suspension Crane Cost & Total Cost of Ownership Guide: 2026 Pricing, Installation & 10-Year TCO Breakdown
Suspension Crane Installation Guide: Building Requirements, Clearance & Cost (2026)
Suspension Crane Safety & Compliance Guide: 2026 Inspection Checklists & Standards
How to Size a Single Girder Crane: Capacity, Span, Lift Height & Duty Class Selection Guide (2026)