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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 SIZE
DIN 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 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
7984
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
 
 
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 SIZE
DIN 911
S
 
 
 
2
2.5
3
4
5
6
8
10
12
14
 
 
931
933
960
961
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
84
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
 
7985
DIA
d2
 
 
 
6
8
10
12
16
20
 
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
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
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
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