Hex flange bolts, also known as flange bolts or hex flange screws, feature a wide, integrated flange beneath the head that distributes clamping loads over a larger surface area. This eliminates the need for a separate washer, simplifies assembly, and reduces component inventory.
Available Types
| Type | Description |
|---|---|
| Plain Flange Bolt (Non-Serrated) | Flange has a smooth underside; provides load distribution without marring the mounting surface. Ideal for applications where surface protection is required. |
| Serrated Flange Bolt | Underside of the flange features radial serrations that bite into the mating surface upon tightening, creating a mechanical lock that resists loosening under vibration and dynamic loads . Suitable for high-vibration environments where minor surface marring is acceptable. |
Applicable Standards
| Standard | Description |
|---|---|
| ASME B18.2.1 | Hex cap screws and hex bolts – inch series |
| DIN 6921 | Hexagon flange bolts – metric series (replaced by EN 1665; dimensions partially differ) |
| Custom | Manufactured per customer drawings or samples |
Materials
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Carbon Steel
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Stainless Steel 304 (A2)
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Stainless Steel 316 (A4)
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Brass
Surface Finishes
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Black Oxide
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Zinc Plating (clear, yellow)
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Hot-Dip Galvanizing (HDG)
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Passivation (stainless steel)
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Plain finish
Size Range
| Series | Size |
|---|---|
| Inch | 1/4″ to 3/4″ (larger sizes available upon request) |
| Metric | M6 to M20 (standard; custom sizes available) |
Thread Requirements
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Inch: ASME B1.1, UNC or UNF, Class 2A
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Metric: ISO metric coarse thread, 6g tolerance
Common Applications
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Automotive assemblies (engine, chassis, suspension)
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Heavy equipment and machinery
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Construction and structural connections
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Appliances and industrial equipment
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Applications requiring vibration resistance (serrated type)
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