- Diameter - Thread Size: 1/4-20
- Grade: 8
- Hardness: 33 to 39 HRC
- Head Size: 5/32 in H
- Head Type: Hex
- Length Under Head: 1-3/8 in
- Material: Alloy Steel
- Material Specification: SAE J429
- Measurement System: Imperial
- Tensile Strength: 150000 psi
- Thread Type: UNC
- Surface Treatment: Plain
- Application
- Standards
For machinery and constructions
ANSI B18.2.1-1996