Dimensions, Physical Properties
Hexagon Nuts DIN 934-Melric Series
Dimensions	Properties

Nominal Thread Size	Pitch	F Max                   G Max		H Max	Nut  Size		Properties Class 5			Properties Class 6			Properties Class 8			Properties Class 10
M6	1.0	10.0	11.05	5.00	Over	To	Proof load Stress Hardness HR			Proof load Stress Hardness HR			Proof load Stress Hardness HR			Proof load Stress Hardness HR
M 8	1.25	13.0	14.38	6.00	M 4	M 7	N/mm2	Min.	Max.	N/mm2	Min.	Max.
M10	1.50	17.0 16.0 18.90 17.77		8.00	M 7	M 10	580			670			855			1040
M12	1.75	19.0 19.0 21.10 20.03		10.00	M 10	M 16	590	B 71	C 30	680	B79	C 30	870	B 92	C 30	1040
M14	2.0	22.0 21.0 24.49 23.35		11.00	M 16	M 100	610			700			880			1050	C 26
M16	2.0	24.0	26.75	13.00	For Use with Bolts of Property class		630	B 76	C 30	720	B 85	C 30	920	B 97	C 36	1060
M18	2.5	27.0	29.56	15.00			4.6, 5,6, 5.8			4.6,5.6,6.8			4.6, 5.6, 5.8, 6.8, & 8.8			8.8 and 10.9
M 20	2.5	30.0	32.95	16.00
M 22	2.5	32.0 34.0 35.03 37.29		18.00
M 24	3.0	36.0	32.95	19.00
M 27	3.0	41.0	45.20	22.00
M 30	3.5	46.0	50.85	24.00
M 33	3.5	50.0	55.37	26.00
M 36	4.0	55.0	60.79	29.00
M 39	4.0	60.0	66.44	31.00
M 42	4.5	65.0	71.30	31.00
M 45	4.5	70.0	76.95	36.00
M 48	5.0	75.0	82.6	38.00
M 52	5.0	80.0	88.25	42.00
M 56	5.5	85.0	93.56	45.00
M 60	5.5	90.0	99.21	48.00
M64	6.0	95.0	104.86	51.00
M68	6.0	100	110.16	54.00
M 72	---	105	116.16	58.00
M 76	---	110	121.81	61.00
M 80	---	115	127.44	64.00
M 84	---	120	133.11	68.00
M 88	---	---	---	---
M 92	---	130	144.08	72
M 96	---	---	---	---
M 100		145	161.04	80

Metric hex nuts are the world standard, and we carry most types you may ever need There are quite a few factors which determine the durability and stress bearing strength of a particular fastener, including material, how the fastener was heat treated, and the major diameter of the threads. The strength of metric nuts is determined by standards known the world over in the fastener industry.

The rating system for commercial grade fasteners among the world of metric nuts and bolts is known as the "property class" numbering system. The Society of Automotive Engineers, on the other hand, uses a symbolic rating system that is used in product labels for fasteners. This is to avoid the problem of counterfeit manufacturers selling cheaper, lower quality fasteners.

The main thing to keep in mind is that the little symbol used in the SAE system is a means of assuring quality. Such fasteners are designed to withstand grade 8 specifications. The same is not true of metric fasteners. A metric nut or bolt can be manufactured to withstand various grade standards. Some metric fasteners are marked for quality assurance, while others aren't.

his is why you need to make sure you are buying from someone you can trust. We have been in the fastener business for over 20 years. We carry only the highest quality fasteners, designed and approved to withstand the most stressful conditions. We stand behind the quality of all our products, metric or otherwise.