Standard: JB /T 6994 - 2007
Available sizes: 10.5 to 9 (7 sizes)
| Size | P | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|
| 10.5 | S | 9±0.8 | 4 | 7.9 | VD25S | 25 | d1+2 | d1+12 | 24~27 | 10.5 |
| 12.5 | S | 9±0.8 | 4 | 7.9 | VD30S | 30 | d1+3 | d1+12 | 29~31 | 10.5 |
| 4 | S | 4.5±0.4 |
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 |
| 3.9 |
| VD6S |
| 6 |
| d1+1 |
| d1+6 |
| 5.5~6.5 |
| 5.2 |
| 5 | S | 4.5±0.4 | 2 | 3.9 | VD8S | 8 | d1+1 | d1+6 | 8~9.5 | 5.2 |
| 6 | S | 6.7±0.6 | 3 | 5.6 | VD12S | 12 | d1+2 | d1+9 | 11.5~13.5 | 7.7 |
| 7 | S | 6.7±0.6 | 3 | 5.6 | VD16S | 16 | d1+2 | d1+9 | 15.5~17.5 | 7.7 |
| 9 | S | 9±0.8 | 4 | 7.9 | VD20S | 20 | d1+2 | d1+12 | 19~21 | 10.5 |
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