M20 Bolt Length 85 Mm With One Hex Nut, One Castle Nut And One Split Pin, As Per Is: 1364 (Part-1) Grade A For M 20 Bolt Property Class 5.6 , Is:1364 (Part-3) Grade B For Hex Head Nut Property Class 5, Is:549/2005 For Split Pin, Is:9549/1980 For Hole Of Nut And Is: 2232:1967 Grade - Precision (P) As The Bolt Is Of Grade A For Castle Nut.