The hexagon socket bolts are divided into iron bolts and stainless steel bolts according to the material. The iron grades are 4.8 bolts, 8.8 bolts, 10.9 hexagon socket bolts and 12.9 hexagon socket bolts. Stainless steel hexagon socket bolts are divided into stainless steel SUS202 hexagon socket bolts, stainless steel SUS304 cylinder head hexagon socket bolts, SUS316 stainless steel hexagon socket bolts, etc.
There are several common specifications for hexagon socket bolts:
1. The hexagonal mouth is allowed to be slightly rounded or countersunk;
2, the end chamfer d <= M4 is the end of the tanning;
3, the length of the incomplete thread Ù <= 2P;
4, the top edge of the head may be round or chamfered, optional by the manufacturer;
5, the bottom edge can be round or chamfered to Dw, but no burrs;
6, the inner six bolt standard: GB / T2672, GB / T2673, GB / T2674, GB / T6190 and GB / T6191.