Standard: GOST 28919 - 1991
Available sizes: M20 to M42 (8 sizes)
| Size | P | r | k_max | k_min | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|
| M20 | 2.5 | 50×105 | 36.9 | 22 | 32 | 0.093 | 65×70 | 31.38 | 21.48 |
| M22 | 3 | 100×70 | 45.9 | 27 | 41 | 0.194 | 80×105 | 40.38 | 26.48 |
| M24 | — | 80×140 | 60.8 | 36 | 55 |
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.
| 0.43 |
| 100×105 |
| 54.26 |
| 35.38 |
| M27 | — | — | 73.1 | 42 | 65 | 0.777 | 350×35 | 64.26 | 41.38 |
| M33 | — | 425×35 | 84.5 | 48 | 75 | 1.197 | 230×105 | 74.26 | 47.38 |
| M36 | — | 350×105 | 94.5 | 56 | 85 | 1.63 | 480×70 | 83.6 | 55.26 |
| M39 | — | — | 112 | 70 | 100 | 2.96 | 280×140 | 98.6 | 69.26 |
| M42 | — | 350×140 | 117.1 | 76 | 110 | 5.4 | 480×105 | 108.6 | 75.26 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.