Standard: BS 450 - 1958
Available sizes: 1/4 to 7/32 (6 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/4 | 0.5000 | 0.031 | 0.145 | 0.958 | 0.281 | 12 | 16 | 0.104 | 0.092 | 0.987 | 0.260 |
| 1/8 | 0.1875 | 0.015 | 0.061 | 0.357 | 0.110 | 24 | (32) |
| 0.050 |
| 0.042 |
| 0.373 |
| 0.099 |
| 3/16 | 0.2500 | 0.031 | 0.078 | 0.473 | 0.144 | 20 | 26 | 0.061 | 0.051 | 0.492 | 0.130 |
| 3/8 | 0.7500 | 0.031 | 0.213 | 1.209 | 0.419 | 10 | 12 | 0.148 | 0.134 | 1.250 | 0.390 |
| 5/16 | 0.6250 | 0.031 | 0.179 | 1.090 | 0.350 | 11 | 14 | 0.126 | 0.113 | 1.125 | 0.325 |
| 7/32 | 0.3750 | 0.031 | 0.112 | 0.716 | 0.212 | 16 | 20 | 0.082 | 0.072 | 0.740 | 0.195 |
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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