Coating: Zinc Phosphate + Oil offers corrosion protection up to the point of assembly (recommend painting for external applications). Salt spray resistance of 72 hours to red rust. Coating color - dark grey to black.
Grip Length (mm): 50.8
Thread: Coarse
Head Height (mm): 7.14375
Thread Size (mm): .375
Grade: 8
Material Description: SAE J429 Grade 8 (ISO Class 10.9)