Standard: BS 916 - 1953
Available sizes: 1/2 to 9/16 (8 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 10 | 0.636 | 0.666 | 0.992 | 1.480 | 8 | 1.040 | 1.71 | 1/32 | 1.000 | 1.450 |
| 1/4 | 22 | 0.198 | 0.218 | 0.3090 | 0.525 | 18 | 0.342 |
| 0.61 |
| 1/32 |
| 0.3125 |
| 0.515 |
| 3/4 | 8 | 1.02 | 1.08 | 1.615 | 2.410 | 5 | 1.685 | 2.78 | 3/64 | 1.625 | 2.365 |
| 3/8 | 16 | 0.345 | 0.375 | 0.5585 | 0.920 | 12 | 0.592 | 1.06 | 1/32 | 0.5625 | 0.900 |
| 5/16 | 18 | 0.282 | 0.302 | 0.4335 | 0.710 | 14 | 0.468 | 0.82 | 1/32 | 0.4375 | 0.695 |
| 5/8 | 8 | 0.96 | 1.00 | 1.490 | 2.220 | 6 | 1.550 | 2.56 | 3/64 | 1.500 | 2.175 |
| 7/16 | 12 | 0.470 | 0.500 | 0.744 | 1.200 | 10 | 0.790 | 1.39 | 1/32 | 0.750 | 1.175 |
| 9/16 | 9 | 0.79 | 0.83 | 1.242 | 1.860 | 7 | 1.300 | 2.15 | 3/64 | 1.250 | 1.815 |
Standard corrosion protection for indoor and mild outdoor environments.
Salt spray: 96–200 hours | RoHS compliant (trivalent chromium)
High-performance coating for automotive, marine, and harsh environments.
Salt spray: 720–1500 hours | Recommended for grade 8.8+
Heavy-duty protection for structural and outdoor applications.
Salt spray: 500–1000 hours | Thread tolerance adjustment required
Note for high-strength fasteners (Grade 10.9, 12.9): Electroplating processes require hydrogen embrittlement relief baking (minimum 4 hours at 200°C within 4 hours of plating). Contact our engineering team for grade-specific plating recommendations.
Request detailed technical specifications, material certifications, and availability information for your application requirements. Our engineering team can provide product recommendations, custom specifications, and technical documentation.
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