When to Use an Underhung Bridge Crane – Features, Benefits, and Ideal Conditions
For operations requiring light to medium lifting in facilities with limited headroom or no overhead runway beams, the underhung bridge crane (also known as a suspension crane) offers an efficient and cost-effective solution.
This article explains what underhung cranes are, how they differ from top-running designs, and when they are the best fit for your lifting needs.
What Is an Underhung Bridge Crane?
An underhung bridge crane is a type of overhead crane where the bridge is suspended from the bottom flange of a runway beam. These runway beams are typically attached to the ceiling or roof trusses, allowing the crane to “hang” rather than sit on top.
The hoist and trolley are mounted below the bridge, making underhung cranes ideal for low-clearance areas.
How Does It Work?
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The bridge is suspended below overhead runways.
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The trolley hoist runs along the bottom flange of the bridge beam.
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The runway beams can be supported by roof trusses or hangers—no need for supporting columns or runways on the floor.
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Movement is possible along 3 axes (X/Y/Z) like all bridge cranes.
Underhung vs Top Running Bridge Cranes
| Feature | Underhung Bridge Crane | Top Running Bridge Crane |
|---|---|---|
| Mounting | Suspended from roof or structure | Runs on top of runway beams |
| Load Capacity | Typically up to 10 tons | Can handle 20–200 tons |
| Building Requirements | No runway supports needed | Requires runway beams or columns |
| Hook Approach | Excellent side approach | Slightly more limited side access |
| Ideal Usage | Light to medium loads, small spaces | Heavy-duty, large-scale operations |
| Floor Obstruction | No floor interference | May require columns/foundations |
Advantages of Underhung Cranes
✅ 1. No Floor Obstruction
Because the crane is fully suspended, there are no columns or runways that block movement or reduce usable floor space.
✅ 2. Excellent for Tight or Low-Headroom Spaces
Ideal for buildings where overhead space is limited and floor space must be maximized.
✅ 3. Cost-Effective for Smaller Loads
Underhung systems are generally less expensive than top-running cranes, particularly for capacities below 10 tons.
✅ 4. Flexibility in System Expansion
You can easily extend the runway length or add monorails for new production lines without major structural changes.
✅ 5. Smooth Operation
Suspended systems offer reduced vibration and smoother transitions when handling sensitive or precision materials.
When to Choose an Underhung Bridge Crane
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Your building lacks columns or structural capacity for top-mounted runways
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You handle loads under 10 tons
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You need clear floor space for forklifts, carts, or conveyors
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You operate in tight or low-height facilities
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You want to suspend a monorail or branching tracks for multiple workstations
Common Applications
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Manufacturing assembly lines
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Mechanical workshops
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Maintenance bays
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Packaging and logistics centers
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Small-scale fabrication units
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Warehouse loading zones
At Nybon Machinery, we manufacture both single and double girder bridge cranes to meet various industrial needs. With capacities ranging from 1 ton to 200 tons, we offer:
When to Choose an Underhung Bridge Crane
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Your building lacks columns or structural capacity for top-mounted runways
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You handle loads under 10 tons
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You need clear floor space for forklifts, carts, or conveyors
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You operate in tight or low-height facilities
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You want to suspend a monorail or branching tracks for multiple workstations
Nybon Machinery – Your Partner for Top Running Bridge Cranes
Nybon Machinery provides high-performance top running bridge cranes customized for industrial and heavy-duty operations.
FAQ – Top Running Cranes
What is the maximum capacity of a top running bridge crane?
Nybon can provide top running cranes with lifting capacities up to 200 tons, with full customization available.
Are top running cranes suitable for outdoor use?
Yes. When combined with weatherproof components, they can be used in semi-outdoor or even full outdoor environments.
Can top running cranes be mounted on existing buildings?
Yes, if the building structure can support the loads. Nybon engineers can evaluate your facility for structural suitability.
How long is the delivery time for a top running crane?
Standard production time is 30–45 days depending on design complexity and quantity.
At Nybon Machinery, we specialize in custom-engineered gantry crane systems tailored to your operational needs. With years of experience and advanced production capabilities, we ensure quality, safety, and performance in every system we deliver.
Need a Crane System?
Contact us for a free consultation and customized solution.
📧 info@nybonmachinery.com | 📞 WhatsApp: +86-15936506686
As a professional Industrial Crane Supplier, Nybon offers
- Customizable Solutions – Available in various load capacities, speeds, and configurations to meet specific industrial requirements.
- High-Quality Manufacturing – Built with strict quality standards to ensure durability, reliability, and long service life.
- Low Maintenance Requirements – Engineered for minimal maintenance, reducing downtime and operational costs.
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- Overhead Cranes
- Electrci Hoist
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