Standard: GB /T 878 - 1986
Available sizes: Φ10 to Φ8 (4 sizes)
| Standard Body | Standard Number |
|---|---|
| GB | GB /T 878 |
| DIN | DIN EN ISO 2342 |
| ISO | ISO 2342 |
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Φ10 | 20 | 2.5 | 6 |
| 17 |
| 3 |
| 19.67 |
| M20 |
| 3.06 |
| 6.8 |
| 22 |
| 3.31 |
| Φ4 | 6 | 1 | 2.5 | 4.6 | 1 | 5.82 | M6 | 1.06 | 2.9 | 6.6 | 1.2 |
| Φ6 | 10 | 1.5 | 3.75 | 8 | 1.6 | 9.78 | M10 | 1.66 | 4.25 | 11 | 1.91 |
| Φ8 | 16 | 2 | 4.8 | 13.6 | 2.5 | 15.73 | M16 | 2.56 | 5.5 | 17.6 | 2.81 |
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.