Standard: JIS B 1251
Available sizes: (Φ4.5) to Φ5 (4 sizes)
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| (Φ4.5) | 8.4 | 1.85 | 1.715 | 1.4 | 1.47 | 8.65 | 17 | 1.8 | 1.885 | 16.7 | 1.33 |
| Φ3 | 4.3 | 0.95 | — | 0.7 | 0.745 | 4.5 | 9 |
| — |
| — |
| 8.75 |
| 0.655 |
| Φ4 | 5.3 | 1.1 | — | 0.8 | 0.85 | 5.5 | 10 | — | — | 9.75 | 0.75 |
| Φ5 | 13 | 2.7 | 2.4 | 2.2 | 2.3 | 13.3 | 24 | 2.5 | 2.6 | 23.6 | 2.1 |
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.
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