Standard: JIS B 1301
Available sizes: (7) to 8 (8 sizes)
| Size | P | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|
| (7) | 16 | 0.40~0.60 | M5 | 15.957 | 10 | 5.5 | 3.7 | 9.91 | 10 |
| 10 | 24 | 0.60~0.80 | M8 | 23.948 | 16 | 9 | 5.7 | 15.89 | 15 |
| 2 | 3 | 0.16~0.25 | / | 2.975 | 3 |
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.
| / |
| / |
| 2.975 |
| / |
| 3 | 5 | 0.25~0.40 | / | 4.97 | 5 | / | / | 4.97 | / |
| 4 | 7 | 0.25~0.40 | / | 6.964 | 7 | / | / | 6.964 | / |
| 5 | 10 | 0.40~0.60 | M3 | 9.964 | 8 | 3.4 | 2.3 | 7.91 | 6 |
| 6 | 14 | 0.40~0.60 | M5 | 13.957 | 9 | 5.5 | 3.7 | 8.91 | 10 |
| 8 | 20 | 0.60~0.80 | M6 | 19.948 | 12 | 6.6 | 4.3 | 11.89 | 11.5 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.