Standard: ASME B 18.6
Available sizes: 4# to 8# (5 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4# | 0.1250 | 0.035 | 0.043 | 0.244 | 0.202 | 0.188 | 0.181 | 0.070 | 0.058 | 0.250 | 0.272 |
| 5# | 0.1510 | 0.039 | 0.048 | — | 0.272 | 0.250 | 0.244 |
| 0.093 |
| 0.080 |
| — |
| — |
| 6# | 0.1900 | 0.050 | 0.060 | — | 0.340 | 0.312 | 0.305 | 0.120 | 0.105 | — | — |
| 7# | 0.2420 | 0.064 | 0.075 | 0.428 | 0.409 | 0.375 | 0.367 | 0.190 | 0.172 | 0.438 | 0.477 |
| 8# | 0.3720 | 0.081 | 0.094 | — | 0.614 | 0.562 | 0.551 | 0.295 | 0.270 | — | — |
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.