Standard: GB 9074.24 - 1988
Available sizes: 2.5 to 5 (4 sizes)
| Standard Body | Standard Number |
|---|---|
| GB | GB /T 97.4(N) |
| DIN | DIN EN ISO 10673(N) |
| ISO | ISO 10673(N) |
| Size | P | k_max | k_min | s_max | s_min | ds_max | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|
| 2.5 | 2.83 | 0.5 | 0.55 | 2.73 | 7 | 0.11 | 6.64 | 0.45 |
| 3 | 4.75 | 1 | 1.1 | 4.57 | 10 | 0.44 | 9.64 | 0.9 |
| 4 | 7.64 | 2 | 2.2 | 7.42 | 16 |
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.
| 2.3 |
| 15.57 |
| 1.8 |
| 5 | 11.53 | 3 | 3.3 | 11.26 | 24 | 7.8 | 23.48 | 2.7 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.