The Grade 12 Nuts with specified proof load values - coarse thread

The ISO 898-2:2013 Grade 12 specification covers carbon steel nuts ranging from M-6 to M-64 diameter. We use high carbon steel material and high alloy steel raw materials to achieve the required properties of Grade 12. There are three popular grades in this standard 8, 10 and 12 which denote material hardness Strength and their respective mechanical properties. Refer to the Mechanical Properties Chart for the subtle Strength differences within each grade.

12

Hex Nuts, Heavy Hex Nuts, Jam nuts, Lock Nuts & Thin Hex Nuts

Property class	Material and heat treatment	Chemical composition limit (cast analysis, %)a
		C		P	S	Mn
		min.	max.	max.	max.	min.
12	CARBON STEEL QUENCHED AND TEMPERED	-	0.58	0.048	0.058	0.45

Mechanical or physical property	Vickers hardness HV			Brinell hardness HB			Rockwell hardness HRC
	min.	max.	min.		max.	min.		max.
M5 ≤ D ≤ M16	295	353	280		336	29		36
M16 < D ≤ M39	272	353	259		336	26		36

Thread Size (D)	Pitch (P)	Proof Loada (N)
M12	1.75	100300
M14	2	136900
M16	2	186800
M18	2.5	230400
M20	2.5	294000
M22	2.5	363600
M24	3	423600
M27	3	550800
M30	3.5	673200
M33	3.5	832800
M36	4	980400
M39	4	1171000