Standard: JB /T 7934 - 1999
Available sizes: 20 to 35 (8 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 | 47 | 14 | 54 | 26 | 53 | 48 | 42 | 7 | 0.6 | 29 | M6 |
| 22 | 50 | 14 | 54 | 26 | 56 | 48 | 42 | 7 | 0.68 |
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.
| 29 |
| M6 |
| 24 | 55 | 14 | 54 | 26 | 61 | 48 | 42 | 7 | 0.82 | 29 | M6 |
| 25 | 60 | 14 | 82 | 26 | 66 | 48 | 42 | 11 | 1.44 | 29 | M6 |
| 28 | 65 | 14 | 82 | 26 | 71 | 48 | 42 | 11 | 1.64 | 29 | M6 |
| 30 | 75 | 41 | 101 | 30 | 81 | 59 | 51 | 6 | 2.28 | 34.4 | M8 |
| 32 | 80 | 41 | 101 | 30 | 86 | 59 | 51 | 6 | 2.53 | 34.4 | M8 |
| 35 | 90 | 41 | 152 | 30 | 96 | 59 | 51 | 9 | 4.56 | 34.4 | M8 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.