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Other Fasteners
Hex flange bolts with an integrated flange that spreads load
Product Center · Others
Hexagon Flange Bolts
Hex flange bolts with an integrated flange that spreads load and replaces a flat washer.
Key specifications
- Installationtorque wrench
- StandardGB/T 5787 (hex flange bolts)
- Typical substratesheet metal, castings, structures
- Key inspectionsflange dimensions, mechanical properties, coating
- Head TypeFlange
- Head styleflanged
Product overviewOverview
A flange bolt integrates the washer into the head. The flange diameter exceeds that of a standard hex head, so bearing area grows and contact stress falls — which is why thin sheet and soft castings survive without a separate washer. It also removes one part and one handling step.
installed by torque wrench.
Key featuresFeatures
- Flange increases bearing area and lowers the risk of dimpling thin sheet.
- Integrated washer function reduces part count and assembly steps.
- Controlled under-head fillet lowers fatigue crack risk.
- Serrated flange versions available for anti-rotation.
Typical applicationsApplications
- Automotive chassis and body
- Construction machinery
- Sheet-metal cabinets and brackets
Selection notesSelection
Flange diameter sets bearing area; for thin sheet choose the larger flange series.
Frequently asked questionsFAQ
How do I specify the Hexagon Flange Bolts?
Flange diameter sets bearing area; for thin sheet choose the larger flange series. installed by torque wrench.
What matters during installation of the Hexagon Flange Bolts?
Tighten it to the torque stated on the drawing with a torque wrench. Flange increases bearing area and lowers the risk of dimpling thin sheet.
Specifications
| Head Type | Flange |
|---|---|
| Standard | GB/T 5787 (hex flange bolts) |
| Head style | flanged |
| Installation | torque wrench |
| Typical substrate | sheet metal, castings, structures |
| Key inspections | flange dimensions, mechanical properties, coating |
Manufacturing and inspection
Flange diameter, head height and width across flats checked to GB/T 5787.We recommend a pilot assembly at the actual torque and mating part before locking the process parameters for volume.
