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METRIC

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