Cross-Beam / Bridge for Gantry Frames | Component Specifications

Product Specifications

Technical details and manufacturing context for Cross-Beam / Bridge

Definition

The cross-beam or bridge is a critical horizontal structural component within a gantry's structural frame. It spans between the vertical columns or legs, forming the upper horizontal member that connects the two sides. Its primary role is to provide lateral stability to the entire gantry structure, resist bending moments from overhead loads, and distribute forces evenly across the vertical supports. In many gantry systems, this component also serves as the main support track for moving elements like hoists, cranes, or automated carriers. The cross-beam is typically fabricated from structural steel or aluminum alloy, with material grade selection depending on load and service conditions. Standard spans range from 3000 to 12000 mm, with longer spans requiring special design. Load capacity is rated from 5 to 50 tonnes per bridge, and higher loads necessitate reinforced structure. Beam height varies from 300 to 800 mm, affecting stiffness and clearance. Deflection limits are specified as L/800 to L/1000 under rated load, per ISO 22986. Material grades commonly used are Q235B to Q355B, per GB/T 1591. Surface treatment includes blast cleaning to Sa2.5 per ISO 8501-1, followed by painting with a total dry film thickness of 80 to 120 μm per ISO 12944. Operating temperature range is -20 to 60°C; below -20°C requires low-temperature steel. For outdoor use, maximum wind speed is 20 to 30 m/s per GB/T 3811, and higher wind requires stowage or anchoring. The weight of the cross-beam depends on span and capacity, ranging from 1500 to 8000 kg, affecting foundation design. These values are directory reference ranges; verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The cross-beam functions as a beam in bending, transferring vertical loads from suspended equipment or carried materials to the vertical supports at its ends. It resists deflection through its material strength and cross-sectional geometry. When integrated into a gantry frame, it works with vertical columns to create a rigid portal frame structure that can withstand both vertical and horizontal forces. The beam's stiffness and load capacity are determined by its span, height, material grade, and cross-section. Under rated load, deflection is limited to L/800 to L/1000 to ensure safe operation. The beam also provides a track for moving elements, and its alignment and levelness are critical for smooth travel. Proper installation and maintenance, including checking for wear, corrosion, and bolt tightness, are essential to maintain structural integrity.

Common Materials

Structural steel, Aluminum alloy

Technical Parameters

Parameter	Typical range	Notes & selection driver
Span Length	3000–12000 mm	Standard spans up to 12 m; longer spans require special design.
Load Capacity	5–50 t	Rated load per bridge; higher loads require reinforced structure.ISO 4301
Beam Height	300–800 mm	Affects stiffness and clearance; larger height increases rigidity.
Deflection Limit	L/800–L/1000	Maximum vertical deflection under rated load.ISO 22986
Material Grade	Q235B–Q355B	Higher grade for heavy loads or low-temperature service.GB/T 1591
Surface Treatment	Sa2.5	Blast cleaning before painting; required for corrosion resistance.ISO 8501-1
Paint Thickness	80–120 μm	Total dry film thickness; higher for aggressive environments.ISO 12944
Operating Temperature	-20–60 °C	Below -20°C requires low-temperature steel.
Max Wind Speed	20–30 m/s	For outdoor use; higher wind requires stowage or anchoring.GB/T 3811
Weight	1500–8000 kg	Depends on span and capacity; affects foundation design.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Flange Part
Provides primary bending resistance through top and bottom plates

Material: steel
Web Part
Vertical plate connecting flanges, resists shear forces

Material: steel
Stiffeners Part
Reinforce web against buckling and local deformation

Material: steel
End Plates Part
Connection interface to vertical columns or supports

Material: steel
Rail Mounting Surface Part
Prepared surface for attaching crane or carrier rails

Material: steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Structural Frame (Gantry)

View system integration details

Manufacturers of Cross-Beam / Bridge

Manufacturer profiles associated with Cross-Beam / Bridge.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the typical span range for a cross-beam?

Standard spans range from 3000 to 12000 mm. Longer spans require special design to ensure adequate stiffness and load capacity.

What load capacities are available?

Rated load capacity per bridge is typically 5 to 50 tonnes. Higher loads require reinforced structure and may need custom engineering.

What materials are commonly used?

Structural steel and aluminum alloy are common. Material grades such as Q235B to Q355B are used, with higher grades for heavy loads or low-temperature service.

What deflection limits are specified?

Maximum vertical deflection under rated load is L/800 to L/1000, per ISO 22986. This ensures safe and precise operation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Not applicable (structural load bearing only)
other spec:	Max deflection: L/360 to L/600 (depending on application), Corrosion allowance: 1-3mm (industrial environments)
temperature:	-40°C to +150°C (depending on material)

Cross-Beam / Bridge

Product Specifications

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