METRIC (SOCKETS, BOLTS, SCREWS, NUTS)

DIMENSIONS OF MOST COMMON HEADS (ALL MEASUREMENTS IN mm)

ILLUSTRATION

DIA

M1.6

M2

M2.5

M3

M4

M5

M6

M8

M10

M12

M16

M20

M24

M30

M36

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 SIZE
DIN 911

S

1.5

1.5

2

2.5

3

4

5

6

8

10

14

17

19

22

27

DIA

d2

DIN 6912 IS LOW HEAD
DIN 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 SIZE
DIN 6911

S

3

4

5

6

8

10

14

17

19

22

27

DIA

d2

SIMILAR TO
DIN 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 SIZE
DIN 911

S

2

2.5

3

4

5

7

8

12

14

17

 

 

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 SIZE
DIN 911

S

 

 

 

2

2.5

3

4

5

6

8

10

12

14

 

 

ACROSS FLATS
(WRENCH SIZE)

S

 

 

 

5.5

7

8

10

13

17

19

24

30

36

46

55

HEIGHT

K

 

 

 

2

2.8

3.5

4

5.5

7

8

10

13

15

19

23

DIA

d2

3

3.8

4.5

5.5

7

8.5

10

13

16

 

 

HEIGHT

K

1

1.3

1.6

2

2.6

3.3

3.9

5

6

 

DIA

d2

 

 

 

6

8

10

12

16

20

 

HEIGHT

K

 

 

 

2.4

3.1

3.8

4.6

6

7.5

 

ACROSS FLATS
(WRENCH SIZE)

S

3.2

4

5

5.5

7

8

10

13

17

19

24

30

36

46

55

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

HRB

min.

max.

63

88

78

97

88

102

--

--

--

--

--

--

--

--

HRC

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

Tensile
Strength 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 AREA
mm2

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
58
84.3

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

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

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

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

Pound-Feet

3.6

7

11

20

29

58

100

159

235

323

440

628

794

1205

1630

ISO Metric Course Threads

I.S.O. Metric Course Threads

Thread

Core

Pitch

Depth

Tapping
Drill

Clearance
Drill

M1.6

1.17mm

0.35mm

0.21mm

1.25mm

1.65mm

M1.8

1.37mm

0.35mm

0.21mm

1.45mm

1.85mm

M2

1.50mm

0.40mm

0.24mm

1.60mm

2.05mm

M2.2

1.64mm

0.45mm

0.27mm

1.75mm

2.25mm

M2.5

1.94mm

0.45mm

0.27mm

2.05mm

2.60mm

M3

2.38mm

0.50mm

0.30mm

2.50mm

3.10mm

M3.5

2.76mm

0.60mm

0.36mm

2.90mm

3.60mm

M4

3.14mm

0.70mm

0.42mm

3.30mm

4.10mm

M4.5

3.57mm

0.75mm

0.46mm

3.80mm

4.60mm

M5

4.01mm

0.80mm

0.49mm

4.20mm

5.10mm

M6

4.77mm

1.00mm

0.61mm

5.00mm

6.10mm

M7

5.77mm

1.00mm

0.61mm

6.00mm

7.20mm

M8

6.46mm

1.25mm

0.76mm

6.80mm

8.20mm

M10

8.15mm

1.50mm

0.92mm

8.50mm

10.20mm

M12

9.85mm

1.75mm

1.07mm

10.20mm

12.20mm

M14

11.54mm

2.00mm

1.22mm

12.00mm

14.25mm

M16

13.54mm

2.00mm

1.22mm

14.00mm

16.25mm

M18

14.93mm

2.50mm

1.53mm

15.50mm

18.25mm

M20

16.93mm

2.50mm

1.53mm

17.50mm

20.25mm

M22

18.93mm

2.50mm

1.53mm

19.50mm

22.25mm

M24

20.31mm

3.00mm

1.84mm

21.00mm

24.25mm

M27

23.31mm

3.00mm

1.84mm

24.00mm

27.25mm

M30

25.7mm

3.50mm

2.14mm

26.50mm

30.50mm