Standard: BS 2470 - 1973
Available sizes: 0# to 4# (5 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|
| 0# | 0.0730 | 0.073 | 0.070 | 0.0695 | 0.118 | 0.031 | 0.625 | 0.112 | 0.050 |
| 1# | 0.0990 | 0.099 | 0.095 | 0.0949 | 0.161 | 0.044 | 0.625 | 0.154 | 5/64 |
| 2# |
| 0.1250 |
| 0.125 |
| 0.121 |
| 0.1202 |
| 0.205 |
| 0.057 |
| 0.750 |
| 0.198 |
| 3/32 |
| 3# | 0.1640 | 0.164 | 0.159 | 0.1585 | 0.270 | 0.077 | 0.875 | 0.262 | 1/8 |
| 4# | 0.1900 | 0.190 | 0.185 | 0.1840 | 0.312 | 0.090 | 0.875 | 0.303 | 5/32 |
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.
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.