Stainless Steel Hexagonal Head Bolts Required In All 3 Grades :316 Grade 304grade 201 Grade Thickness Length 6 12,15,20,25,30,35,40,50,60,75 8 20,25,30,35,40,50,60,65,75,80,100 10 20,25,30,35,40,50,60,65,75,80,100 12 20,25,30,35,40,50,60,65,75,80,100 16 20,25,30,35,40,50,60,65,75,80,100 ? ?, ?, 1, 1 ? , 1 ?, 2 , 2 ? , 3, 3 ? , 4 5/16 ?, ?, 1, 1 ? , 1 ?, 2 , 2 ? , 3, 3 ? , 4 3/8 ?, ?, 1, 1 ? , 1 ?, 2 , 2 ? , 3, 3 ? , 4 ? 1, 1 ? , 1 ? , 2 ,, 2 ?, 3 , 3 ? , 4, 5 , 6 5/8 1, 1 ? , 1 ? , 2 ,, 2 ?, 3 , 3 ? , 4, 5 , 6