Metric: Sockets, Bolts, Screws, Nuts

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SOCKETS, BOLTS, SCREWS,
NUTS

DIMENSIONS OF MOST COMMON HEADS

(ALL
MEASUREMENTS IN mm)

DIN	DIA		ILLUSTRATION	M1.6	M2	M2.5	M3	M4	M5	M6	M8	M10	M12	M16	M20	M24	M30	M36
912	DIA	d₂		3	3.8	4.5	5.5	7	8.5	10	13	16	18	24	30	36	45	54
	HEIGHT	K		1.6	2	2.5	3	4	5	6	8	10	12	16	20	24	30	36
	HEX KEY SIZEDIN 911	S		1.5	1.5	2	2.5	3	4	5	6	8	10	14	17	19	22	27
6912	DIA	d₂		DIN 6912 IS LOW HEADDIN 6911 IS A HEX KEY WITH GUIDE				7	8.5	10	13	16	18	24	30	36	45	54
	HEIGHT	K						2.8	3.5	4	5	6.5	7.5	10	12	14	17.5	21.5
	HEX KEY SIZEDIN 6911	S						3	4	5	6	8	10	14	17	19	22	27
7984	DIA	d₂		SIMILAR TODIN 6912 BUT HEX SOCKET IS WITHOUT GUIDE			5.5	7	8.5	10	13	16	18	24	30	36
	HEIGHT	K					2	2.8	3.5	4	5	6	7	9	11	13
	HEX KEY SIZEDIN 911	S					2	2.5	3	4	5	7	8	12	14	17
7991	DIA	d₂					6	8	10	12	16	20	24	30	36	39
	HEIGHT	K					1.7	2.3	2.8	3.3	4.4	5.5	6.5	7.5	8.5	14
	HEX KEY SIZEDIN 911	S					2	2.5	3	4	5	6	8	10	12	14
931	ACROSS FLATS(WRENCH SIZE)	S					5.5	7	8	10	13	17	19	24	30	36	46	55
931	HEIGHT	K					2	2.8	3.5	4	5.5	7	8	10	13	15	19	23
84	DIA	d₂		3	3.8	4.5	5.5	7	8.5	10	13	16
84	HEIGHT	K		1	1.3	1.6	2	2.6	3.3	3.9	5	6
7985	DIA	d₂					6	8	10	12	16	20
7985	HEIGHT	K					2.4	3.1	3.8	4.6	6	7.5
934	ACROSS FLATS(WRENCH SIZE)	S		3.2	4	5	5.5	7	8	10	13	17	19	24	30	36	46	55
934	HEIGHT	m		1.3	1.6	2	2.4	3.2	4	5	6.5	8	10	13	16	19	24	29

MECHANICAL
PROPERTIES OF FASTENERS

CLASS

New Designation

4.6

4.8

5.6

5.8

6.6

6.8

6.9

8.8

10.9

12.9

14.9

Formerly

4D

4S

5D

5S

6D

6S

6G

8G

10K

12K

—

U.S. GRADE

1

2

2

2

3

3

3

5

8

—

—

Brinell

min.

max.

110

170

140

215

170

245

225

300

280

365

330

425

390

—

Rockwell

min.

max.

63

88

78

97

88

102

—

—

—

—

—

—

—

—

min.

max.

—

—

—

18

31

27

38

34

44

40

49

Yield Point
psi

45,000

56,000

76,000

76,000

91,000

128,000

153,000

180,000

TensileStrength psi

min.

max.

56,000

78,000

70,000

100,000

85,000

113,000

85,338

99,561

113,784

128,000

142,230

170,676

170,000

200,000

200,000

230,000

MECHANICAL PROPERTIES OF NUTS

NOMINAL DIAMETER mm	PITCH mm	NOMINAL STRESS AREAmm²	PROPERTY CLASSES OF NUTS
			4	5	6	8	10	12	14
			PROOF LOAD kfg
M6 M7	1 1	20.1 28.9	800 1,150	1,000 1,450	1,200 1,730	1,600 2,300	2,000 2,900	2,400 3,470	2,800 4,000
M8 M10 M12	1.25 1.5 1.75	36.6 5884.3	1,450 2,300 3,350	1,830 2,900 4,210	2,200 3,500 5,050	2,900 4,600 6,700	3,650 5,800 8,400	4,300 6,950 10,000	5,100 8,100 11,800
M14 M16	2 2	115 157	4,600 6,300	5,750 7,850	6,900 9,400	9,200 12,600	11,500 15,700	13,800 18,800	16,100 22,000
M20 M24	2.5 3	245 353	9,800 14,100	12,200 17,600	14,700 21,200	19,600 28,200	24,500 35,300	29,400 42,300	34,300 49,400
M27 M30 M33	3 3.5 3.5	459 561 694	18,400 22,400 27,800	23,000 28,000 34,700	27,600 33,600 41,600	36,700 44,800 55,500	45,900 56,100 69,400	55,000 67,300 83,300	64,300 78,500 97,000
M36	4	817	32,700	40,800	49,000	65,300	81,700	98,000	114,400
M8	1	39.2	1,570	1,960	2,350	3,100	3,900	4,700	5,500
M10 M12 M16	1.25 1.25 1.5	61.2 92.1 167	2,400 3,700 6,700	3,060 4,600 8,350	3,700 5,500 10,000	4,900 7,400 13,400	6,100 9,200 16,700	7,350 11,000 20,000	8,550 12,900 23,400
M20 M24	1.5 2	272 384	10,900 15,400	13,600 19,200	16,300 23,000	21,800 30,700	27,200 38,400	32,600 46,000	38,000 53,800

TIGHTENING TORQUES IN KILOGRAM
METERS

GRADE		NOMINAL DIAMETER – REGULAR PITCH
GRADE		M4	M5	M6	M7	M8	M10	M12	M14	M16	M18	M20	M22	M24	M27	M30
8.8	kpm	0.29	0.57	1	1.6	2.5	5	8	13	20	26	36	51	65	98	134
8.8	Pound-Feet	2	4	7	11	18	32	58	94	144	190	260	368	470	707	967
10.9	kpm	0.4	0.8	1.4	2.3	3.5	6	12	18	27	37	51	72	92	138	188
10.9	Pound-Feet	2.9	6	10	16	25	47	83	133	196	269	366	520	664	996	1357
12.9	kpm	0.5	1	1.6	2.7	4	8	14	22	33	45	61	87	110	167	226
12.9	Pound-Feet	3.6	7	11	20	29	58	100	159	235	323	440	628	794	1205	1630

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