- Grade 8 Hex Head Cap screws are medium carbon steel that is quenched and tempered
- Zinc plated with a minimum yield strength of 130,000 PSI
- Proof load of 120,000 PSI and a minimum Tensile strength of 150,000 PSI
- The top of the head is marked with 6 radial lines
| Type | Bolt |
| Style | Cap Screw |
| Size | 5/16"-18 |
| Material | Carbon Steel |
| Grade/Class | 8 |
| Thread Type | UNC, USS |
| Thread Style | Fully Threaded |
| Head Width | 1/2" |
