Material Handling Crane
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This page explains how Bridge Girder is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.
The primary horizontal structural beam of an overhead crane that supports the trolley and hoist.
Technical details and manufacturing context for Bridge Girder
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Span Length | 7.5–31.5 m | Standard spans; custom up to 40 mGB/T 14405 |
| Rated Lifting Capacity | 5–100 t | Higher capacities require twin girder designGB/T 14405 |
| Crane Duty Class | A5–A7 | A7 for heavy continuous useGB/T 3811 |
| Max Deflection | ≤L/800 mm | At rated load; L is span in mmGB/T 14405 |
| Material Grade | Q235B–Q355B | Higher strength for longer spansGB/T 700, GB/T 1591 |
| Girder Height | 500–2000 mm | Depends on span and capacity |
| Girder Width | 300–800 mm | Box girder width |
| Weight | 2–20 t | Per girder; affects crane deadload |
| Surface Treatment | Sa2.5 | Blast cleaning before primerISO 8501-1 |
| Paint Thickness | 80–120 μm | For C3 corrosion environmentISO 12944 |
| Operating Temperature | -20–60 °C | Below -20°C requires low-temp steel |
| Rail Type | P18–P50 | Matched to wheel loadGB/T 11264 |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is essential for the following industrial systems and equipment:
| pressure: | N/A (structural load bearing, not fluid pressure) |
| other spec: | Max dynamic load capacity: 1-500 tons, Span: 5-50 meters, Deflection limit: L/800 to L/1000 |
| temperature: | -20°C to +60°C |
Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.
Quoted from the published standard.
3 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.
Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.
A practical evidence checklist for RFQ preparation and supplier evaluation.
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Standard spans range from 7.5 to 31.5 meters, with custom spans up to 40 meters, per GB/T 14405. The actual span depends on the crane's application and runway layout.
Bridge girders are typically made of structural steel or high-strength low-alloy steel, with material grades such as Q235B to Q355B. The choice depends on span, capacity, and operating conditions.
The maximum deflection at rated load is limited to L/800, where L is the span in millimeters, per GB/T 14405. This ensures proper alignment and safe operation.
Key standards include GB/T 14405 for general specifications, GB/T 3811 for design rules, and ISO 8501-1 and ISO 12944 for surface treatment and painting. Always verify compliance with the manufacturer.
Editorial classification, named public sources where available, and source-reviewed manufacturer records.
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