Hexagonal Head Structural Bolts DIN 7990

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Hexagonal Head Structural Bolts DIN 7990

Metric Series:

Physical Properties
Property Class	5.8	6.8	8.8		10.9
Diameter	All Diameter	All Diameter	<M16	>M16	All Diameter
Unit	N/mm2	N/mm2	N/mm2		N/mm2
Tensile Strength (Min)	520	600	800	830	1040
Yield Strength 0.2% offset (Min)	420	480	640	660	940
Proof Load Stress	380	440	580	600	830
Impact Strength (Min) (J)	N/A	N/A	30	30	20
Hardness Rockwell [HR]	B82-B95	B89-B100	C22-C32	C23-C34	C32-C39
Elongation (Min.) [%]	N/A	N/A	12	12	9
Reduction of Area (Min). [%]	N/A	N/A	52	52	48

Recommended Tightening Torques and Induced Loads
Nominal Thread Size	Stress Are (mm2)	5.8		6.8		8.8		10.9
		Unlubricated Finish	Induced Load	Lubricated Finish	Induced Load	Unlubricated Finish	Induced Load	Unlubricated Finish	Induced Load
		Nm	Kn	Nm	Kn	Nm	Kn	Nm	Kn
M12	84.3	59.48	24.78	67.98	28.32	90.64	37.77	133.13	55.47
M16	157.0	147.71	46.16	168.81	52.75	225.08	7034	330.58	103.31
M20	245.0	288.12	72.03	392.28	82.32	452.76	113.20	644.84	161.21
M22	303.0	391.96	89.08	447.95	101.81	615.94	140.00	877.25	199.37
M24	353.0	498.15	103.78	569.32	118.61	782.81	163.08	1114.91	232.27
M27	459.0	728.71	134.95	832.81	154.22	1145.11	212.06	1630.92	302.02
M30	561.0	989.61	164.93	1130.97	188.50	1555.10	259.18	2214.83	369.14

Note:

The Tightening torques are calculated to induce approximately stresses as detailed below:

294 N/mm2 for Property Class 5.8

336 N/mm2 for Property Class 6.8

448 N/mm2 for Property Class M<16

448 N/mm2 for Property Class 8.8 >16

658 N/mm2 for Property Class 10.9

The tightening torques of lubricated finished is 75% of the values stated unlubricated finish.

Nominal Thread Size	Pitch	F Max.	G Max.	B Max.	H Max.	R Max.	Length of Thread	Length Range L
Nominal Thread Size	Pitch	F Max.	G Max.	B Max.	H Max.	R Max.	LT	Length Range L
M12	1.75	19.0	21.10	12.70	8.0	0.60	17.75	25-120
M16	2.00	24.0	26.16	16.70	10.0	0.60	21.00	30-150
M20	2.50	30.0	32.95	20.84	13.0	0.80	23.50	35-200
M22	2.50	32.0	35.03	22.84	14.0	0.80	25.50	45-200
M24	3.00	36.0	39.55	24.84	15.0	0.80	26.00	50-200
M27	3.00	41.0	45.20	27.84	17.0	1.00	29.00	7-200
M30	3.50	46.0	50.85	30.84	19.0	1.00	30.50	80-200

Metric Series Dimensions:

The Bolts and Screws will generally conform to DIN 7990

Thread will conform to Class 6g of DIN 13 Coarse Series

Material: Carbon / Alloy Steel

Heat Treatment: To achieve mechanical properties of Class 8.8 and 10.9

All dimensions are in millimeters