Standard: BS 1083 - 1965
Available sizes: 1/4 to 7/16 (4 sizes)
| Size | P | k_max | k_min | s_max | s_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|
| 1/4 | 18 | 0.166（0.192） | 0.156（0.182） | 22 | 0.525 | 0.518 | 0.61 |
| 3/8 | 12 | 0.333 | 0.323 | 16 | 0.920 | 0.912 | 1.06 |
| 5/16 | 14 | 0.250 | 0.240 | 18 | 0.710 | 0.702 | 0.82 |
| 7/16 | 10 | 0.458 | 0.448 | 12 | 1.200 | 1.190 | 1.39 |
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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