Are Grade 8 Nuts Weldable?

Grade 8 fasteners are made of 4140 type alloy then heat treated. Excellent weld stock although the heat may anneal them some.

Are there Grade 8 nuts?

Class 8. This is a metric nut grading similar to the SAE grade 5 classification, which is used in conjunction with Class 8.8 bolts. This is a medium strength nut.

Can you harden Grade 8 bolts?

Higher carbon steels can be hardened, while low carbon steels are considered non-hardenable. ... ASTM A325, ASTM A490 SAE grade 5 and SAE grade 8 fasteners are made of higher carbon plain or alloy steels, which can be hardened through a quenching and tempering process.