Standard: ANSI B 18.2
Available sizes: M1.6 to M3.5 (5 sizes)
| Standard Body | Standard Number |
|---|---|
| GB | GB /T 6170 |
| IS | IS 1364(-3) |
| DIN | DIN EN ISO 4032 |
| ISO | ISO 4032 |
| UNI | UNI 5588 |
| ANSI | ASME/ANSI B 18.2.4.1M |
| Size | P | k_max | k_min | s_max | s_min | ds_max | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|
| M1.6 | 0.40 | 4.32 | 1.60 | 4.00 | 3.82 | 3.1 | 4.62 | 1.35 |
| M2 | 0.50 | 6.01 | 2.40 | 5.50 | 5.32 | 4.6 | 6.35 | 2.15 |
| M2.5 | 0.70 | 7.66 | 3.20 | 7.00 | 6.78 |
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.
| 6.0 |
| 8.08 |
| 2.90 |
| M3 | 1.00 | 11.05 | 5.20 | 10.00 | 9.78 | 8.9 | 11.55 | 4.90 |
| M3.5 | 1.25 | 14.38 | 6.80 | 13.00 | 12.73 | 11.6 | 15.01 | 6.44 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.