Standard: ANSI B 18.6
Available sizes: M1 to M2.5 (6 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M1 | 2.3 | 0.2 | 0.3 | 0.72 | 0.44 | 2.05 | 0.8 | 0.4 | 0.58 | 0.88 | 0.3 |
| M1.2 | 3 | 0.2 | 0.5 | 1.08 | 0.54 | 2.75 | 1.2 | 0.6 |
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.
| 0.78 |
| 1.32 |
| 0.4 |
| M1.4 | 4.2 | 0.20 | 0.8 | 1.68 | 0.74 | 3.9 | 1.8 | 1 | 1.3 | 1.92 | 0.6 |
| M1.6 | 7 | 0.4 | 1.3 | 2.6 | 1.25 | 6.64 | 2.8 | 1.5 | 1.8 | 3 | 1 |
| M2 | 10 | 0.4 | 2.3 | 3.76 | 1.75 | 9.64 | 4 | 2.5 | 2.8 | 4.24 | 1.5 |
| M2.5 | 15 | 0.5 | 3.25 | 5.76 | 2.75 | 14.57 | 6 | 3.5 | 3.85 | 6.24 | 2.5 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.