Standard: GB /T 39949.1
Available sizes: 12 to 63 (8 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 12 | 12500 | 18 | 19 | 16.018 | 16 | 22 | M14×1.5 | 20.5 | 44 | 16 | 15.82 |
| 16 | 32000 | 27 | 29 | 25.021 | 25 | 31 | M20×1.5 |
| 32 |
| 65 |
| 25 |
| 24.79 |
| 20 | 80000 | 41 | 46 | 40.025 | 40 | 47 | M33×2 | 50 | 97 | 40 | 39.75 |
| 25 | 200000 | 62 | 64 | 63.03 | 63 | 70 | M48×2 | 72.5 | 140 | 63 | 62.7 |
| 32 | 500000 | 98 | 9196 | 100.035 | 100 | 110 | M72M80×3 | 114 | 210 | 100 | 99.65 |
| 40 | 1250000 | 150 | 126 | 160.04 | 160 | 165 | M125×4 | 200 | 310 | 160 | 159.6 |
| 50 | 3200000 | 265 | 205 | 250.046 | 250 | 300 | M200×4 | 320 | 530 | 250 | 249.54 |
| 63 | 5000000 | 325 | 260 | 320.057 | 320 | 360 | 250×6 | 375 | 640 | 320 | 319.43 |
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.