carbon-steelSAE J429
SAE J429 Grade 2
Low carbon steel inch fastener. Head marked with no radial lines.
Tensile Rm414 MPa
Yield Rp0.2393 MPa
HardnessHRB 70–100
Nut class—
Mechanical properties
- Property class
- SAE J429 Grade 2
- Defined in
- SAE J429
- Tensile strength Rm (min)
- 414 MPa
- Yield strength Rp0.2 (min)
- 393 MPa
- Hardness
- HRB 70–100
- Matching nut class
- —
- Material
- Carbon Steel
Where this grade is used
Property classes are stamped on the head of bolts and screws above 5 mm diameter. A SAE J429 Grade 2 fastener is specified where the joint needs a proof load of roughly 354 MPa or less. Always match the bolt class with a nut of class — or higher so the bolt fails before the thread strips.