For Grade 8 Bolts?

Grade 8 – Grade 8 bolts are made from medium carbon alloy steel. The bolts of this grade feature 6 radial lines. The nominal size of the grade 8 bolts can be from 1/4″ to 1 1/2″. The minimum yield strength of this grade bolt is 130,000 psi.

Is Grade 8 or 8.8 Stronger?

In terms of strength, 8.8 is equivalent to Grade 5, 10.9 is equivalent to grade 8. There are also 12.9 metric bolts, which are a little stronger than 10.9, and are a higher alloy steel.

Do you need Grade 8 nuts for Grade 8 bolts?

No, you should not use a mild steel tensile nut with a high tensile bolt. Match the bolt and nut grade or opt for a nut of a higher grade than the bolt.