Flange nuts are hex nuts with a built-in, non-spinning washer at the base. The integrated flange distributes clamping load evenly across the mounting surface, eliminating the need for a separate washer and simplifying assembly.
Applicable Standards
| Standard | Description | Notes |
|---|---|---|
| DIN EN 1661 / DIN 6923 | Hexagon flange nuts – metric series | DIN EN 1661 is the current European standard, superseding DIN 6923. Dimensions largely interchangeable; M10 across flats changed from 15 mm to 16 mm. Available in serrated or plain versions. |
| DIN 6926 | Hexagon flange nuts with nylon insert – metric series | Prevailing torque locking type; nylon insert provides vibration resistance. |
| DIN 6331 | Hexagon collar nuts (height 1.5 × thread diameter) – metric series | Plain flange, taller design for clamping applications requiring frequent assembly/disassembly. |
| ASME B18.16.6 | Serrated hex flange locknuts and serrated nylon insert flange locknuts – inch series | Locking type; includes both all-metal and nylon insert configurations. |
| ASME B18.2.2 | Square and hex nuts – inch series | Covers plain hex flange nuts (non‑locking) for general industrial use. |
Material & Grade Options
| Material | Inch Grades | Metric Property Classes |
|---|---|---|
| Carbon Steel | Grade 2, Grade 5, Grade 8 | 8, 10, 12 |
| Stainless Steel | 304 (A2), 316 (A4) | A2-70, A4-80 |
| Brass | – | – |
Surface Finishes
Zinc plating (clear, yellow), black oxide, hot-dip galvanizing, passivation (stainless steel), plain finish
Additional Configurations Available:
We also manufacture custom flange nuts per customer drawings or samples, including:
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12-point flange lock nuts
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Large flange lock nuts
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High collar flange lock nuts
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Non-standard thread sizes
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Custom flange diameters and thicknesses
Common Applications
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Automotive assemblies (engine, chassis, suspension)
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Heavy equipment and machinery
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Electrical enclosures and control panels
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Appliances and consumer products
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Structural connections where surface protection is critical (plain flange)
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