GENERAL TORQUE SPECIFICATION CHART FOR I.S.O.** METERIC FASTENERS*** (when SAE 10 oil is used as a lubricant
Minimum
Tensile
Strength
kg/mm2
P.S.I.
40
50
60
80
100
120
56900
71100
85340
113800
142200
170700
Proof
kg/mm2
22.6
29.1
28.2
36.4
33.9
43.7
47.5
58.2
79.2
95
Load
P.S.I.
32150
41390
40110
51770
48220
62160
67560
82780
112650
135130
Property Class
4.6
4.8
5.6
5.8
6.6
6.8
6.9
8.8
10.9
12.9
Bolt Diameter
Figures are KILOGRAM METER except those that are bolded which are KILOGRAM CENTEMETER
Metric
Inch
6mm
0.236
49
63
61
79
74
95
103
126
172
206
8mm
0.315
119
153
148
191
178
230
250
306
417
500
10mm
0.394
235
303
294
379
353
455
495
606
8.2
10
12mm
0.472
411
529
427
662
616
7.9
8.6
10.5
14
17
14mm
0.551
654
8.4
8.2
10.5
10
12
13
17
23
27
16mm
0.63
10
13
12
16
15
20
21
26
36
43
18mm
0.709
14
18
17
23
21
27
30
36
49
59
22mm
0.866
27
35
34
44
41
52
57
70
95
114
*** NOTE: Use
only when manufacture's specifications are not available, these values are
for stiff metal-to-metal joints and are based on 90% of proof load. DO NOT
USE for gasket joints or joints of soft materials
** I.S.O.= International Standardization Organization.
Fastener
Type
Minimum
Tensile
Strength
Material
PRODUCTION TORQUE GUIDE
Body size of Outside Diameter
2
3
4
5
6
8
10
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1-1/8
1-1/4
1-3/8
1-1/2
S.A.E 2 Steel
74000 P.S.I
Low Carbon
6
12
20
32
47
69
96
155
206
310
480
675
900
1100
S.A.E. 5 Steel
120000 P.S.I
Medium Carbon Heat Treat
10
19
33
54
78
114
154
257
382
587
794
1105
1500
1775
S.A.E. 7 Steel
133000 P.S.I.
Medium Carbon Alloy
13
25
44
71
110
154
215
360
570
840
1325
1825
2500
3000
S.A.E. 8 Steel
150000 P.S.I.
Medium Carbon Alloy
14
29
47
78
119
169
230
380
600
900
1430
1975
2650
3200
Socket Head
Cap Screw
160000 P.S.I.
High Carbon Quenched Tempered
16
33
54
84
125
180
250
400
640
970
1520
2850
2130
3450
Socket Set
Screw
212000 P.S.I.
High Carbon Quenched Tempered
9*
16*
30*
70*
140*
18
29
43
63
100
146
Machine Screw
Stainless
18-8
2.6*
4*
5.5*
8*
10*
20*
23*
75*
132*
20
31
43
58
95
130
194
260
400
500
725
Machine Screw
Stainless
316
2.7*
4*
5.7*
8*
10*
22*
25*
80*
140*
22
34
46
60
100
135
210
280
425
515
750
Machine Screw
Yellow Brass
60000 P.S.I.
CU 63 ZN 37
2*
3.3*
4.4*
6.4*
8*
16*
20*
65*
110*
17
27
37
49
78
104
160
215
325
400
595
Silicone Bronze
Type "B"
70000 P.S.I.
CU 96 ZNI-5 Min.
2.3*
3.7*
4.9*
7.2*
10*
19*
22*
70*
125*
20
30
41
53
88
117
180
250
365
450
655
Machine Screw
Aluminum
55000 P.S.I.
CU 3.8-4.9 1.2-1.8 MN .3-.9
1.4*
2.1*
2.9*
4.3*
5.4*
12*
15*
46*
82*
13
20
27
36
62
83
128
170
255
315
460
Machine Screw
Monel
82000 P.S.I.
NI 67 CU 30 FE 1.4
2.5*
4*
5.5*
8*
11*
21*
27*
87*
155*
23
36
50
67
115
155
235
315
475
585
850
Sems Heat
Treated Steel
120000 P.S.I.
1018 1022
4*
5*
7*
11*
15*
27*
37*
90*
200*
300*
Studs
Use SAE 2.5 and 8 values when grade is known, with nut of
sufficient strength.
All figures are POUND FEET except those
marked with an ASTERISK( * ) WHICH ARE pound inches.
These values are for lubricated fasteners.
Tapping Screw
Set up joint as it will be in production use 70% of over-torque
failure as production specifications.
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