Standard: NF E 27
Available sizes: 11~13 to 9~11 (8 sizes)
| Size | P | s_max | s_min | k_nominal |
|---|---|---|---|---|
| 11~13 | 27.5 | 20.3 | 7.5 | 1.2 |
| 13~15 | 31.5 | 23.3 | 9 | 1.3 |
| 14~17 | 35.5 | 27.3 | 9 | 1.3 |
| 15~18 | 40 | 31.3 | 9.5 | 1.4 |
| 17~20 | 44 | 34.3 | 9.5 | 1.4 |
| 5~7 | 13.5 |
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.
| 9.3 |
| 7 |
| 0.7 |
| 7~9 | 19 | 13.3 | 7 | 0.9 |
| 9~11 | 24 | 17.3 | 7.5 | 1.2 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.