BS 4882

Table 3. British Standard specifications for steels to be used in the manufacture of bolting complying with BS 1768, BS 1769, BS 3692 and BS 6104 : Part 1 for pressure containing applications

Steel		Bolting		Bolting specification¹⁾
British Standard	Steel type/grade	Nominal size		BS 1768 strength grade	BS 1769 strength grade	BS 3692 / BS 6104 : Part 1 strength grade
British Standard	Steel type/grade	Metric series	Inch series	BS 1768 strength grade	BS 1769 strength grade	BS 3692 / BS 6104 : Part 1 strength grade
BS 3111 BS 970	0/3	≤ 24 mm	≤ 1 in	B	B	4.8
BS 3111 BS 970	070M20	> 24 mm	> 1 in	B	B	4.8
BS 970 BS 3111 BS 3111 BS 970	080M40	≤ 20 mm	≤ ¾ in	P	–-	6.8
	1/3	≤ 20 mm	≤ ¾ in
	10/2	≤ 30 mm	≤ 1⅛ in
	135M44	> 20 mm	> ¾ in
BS 1506 BS 970 BS 970 BS 3111 BS 3111	630	≤ 68 mm	≤ 2½ in	S	–-	8.8
	708M40	≤ 68 mm	≤ 2½ in
	135M44	≤ 29 mm	≤ 1⅛ in
	1/3	≤ 20 mm	≤ ¾ in
	10/2	≤ 30 mm	≤ 1⅛ in
¹) See 1.4.1 and 1.3.1 NOTE. See table 4 for general notes.