Hex bolt is six sided hexagonal bolts and most commonly used fastener. Hex bolt comes in different materials and strength.
Mild Steel (M.S) hex bolt strength is measured by its grade, such as 4.8, 8.8, 10.9 and 12.9
Stainless Steel (S.S) Hex bolt comes in different grades. Most commonly S.S bolt available are grade 304 (A2-70) and 316 (A4-70)