Standard: DIN 931
Available sizes: (M3.5) to M4 (6 sizes)
| Standard Body | Standard Number |
|---|---|
| EN | EN 24014 |
| GB | GB /T 5782 |
| IS | IS 1364-1 |
| NF | NF E 25-112 |
| DIN | DIN EN ISO 4014 |
| ISO | ISO 4014 |
| UNI | UNI 5737 |
| Size | P | e | k_max | k_min | s_max | s_min | ds_max | ds_min |
|---|
| ds_nominal |
|---|
| (M3.5) | 1.25 | 11.6 | 0.15 | 0.6 | 22 | 28 | 8 | 7.78 | 9.2 |
| M1.6 | 0.4 | 3.2 | 0.1 | 0.25 | 10 | — | 2 | 1.86 | 2.6 |
| M2 | 0.5 | 4.6 | 0.15 | 0.4 | 12 | — | 3 | 2.86 | 3.6 |
| M2.5 | 0.7 | 5.9 | 0.15 | 0.4 | 14 | — | 4 | 3.82 | 4.7 |
| M3 | 1 | 8.9 | 0.15 | 0.5 | 18 | 24 | 6 | 5.82 | 6.8 |
| M4 | 1.75 | 17.4 | 0.15 | 0.6 | 30 | 36 | 12 | 11.73 | 13.7 |
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.