Standard: BS 4174 - 1972
Available sizes: 0# to 6# (5 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0# | 2.95 | 0.112 | 0.116 | 5.36 | 4.90 | 2.84 | 2.44 | 1.90 | 7 | 2.34 | 2.18 |
| 00# | 1.90 | 0.072 | 0.075 | 3.22 | 3.00 | 1.83 | 1.60 |
| 1.04 |
| 6 |
| 1.52 |
| 1.24 |
| 2# | 3.91 | 0.150 | 0.154 | 7.24 | 6.70 | 3.81 | 3.20 | 2.51 | 8 | 3.10 | 2.82 |
| 4# | 4.62 | 0.177 | 0.182 | 9.12 | 8.48 | 4.50 | 3.81 | 3.12 | 8 | 3.71 | 3.48 |
| 6# | 6.15 | 0.236 | 0.242 | 11.61 | 10.90 | 6.00 | 5.13 | 3.94 | 9 | 5.03 | 4.32 |
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.