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Torque Table Hexagon Screws with UNC Threads Table
ANSI Engineering Hardware | Engineering Fastener Torque Specifications
ISO Metric Hard Engineering Data
Preloads and tightening torque for steel shank screws with UNC/UNF threads and head contact area sizes according to ASME B18.2.1, ASME B18.3 and ASME B18.2.2
friction coefficient µ = 0.14, Utilization of minimum yield = 90%
Typical Torque for Hexagon Head Screws with UNC Thrreads
Dimensions |
Preloads Fv (kN) (lbf) for Property Class
|
Tightening torque Ma (Nm) (ft-lbs) for property class
|
||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Grade 5*
|
Grade 8*
|
Type 2*
|
Type 3*
|
Grade 5*
|
Grade 8*
|
Type 2*
|
Type 3*
|
|||||||||||||||
Ø
|
M
|
[kN]
|
[lbf]
|
[kN]
|
[lbf]
|
[kN]
|
[lbf]
|
[kN]
|
[lbf]
|
[Nm]
|
[ft-lbs]
|
[Nm]
|
[ft-lbs]
|
[Nm]
|
[ft-lbs]
|
[Nm]
|
[ft-lbs]
|
|||||
1/4
|
20
|
10.1
|
2260
|
14.2
|
3194
|
-
|
-
|
-
|
-
|
12.1
|
8.95
|
17.1
|
12.6
|
-
|
-
|
-
|
-
|
|||||
5/16
|
18
|
16.7
|
3764
|
23.7
|
5319
|
-
|
-
|
-
|
-
|
25.7
|
18.9
|
36.3
|
26.7
|
-
|
-
|
-
|
-
|
|||||
3/8
|
16
|
24.9
|
5594
|
35.2
|
7904
|
-
|
-
|
-
|
-
|
44.6
|
32.9
|
63
|
46.4
|
-
|
-
|
-
|
-
|
|||||
7/16
|
14
|
34.2
|
7684
|
48.3
|
10858
|
-
|
-
|
-
|
-
|
70.9
|
52.3
|
100
|
73.9
|
-
|
-
|
-
|
-
|
|||||
1/2
|
13
|
45.8
|
10300
|
64.7
|
14554
|
45.8
|
10300
|
45.8
|
10300
|
109
|
80.3
|
154
|
114
|
109
|
80.3
|
109
|
80.3
|
|||||
5/8
|
11
|
73.2
|
16464
|
103
|
232065
|
73.2
|
16464
|
73.2 |
16464
|
213
|
157
|
301
|
222
|
213
|
157
|
213
|
157
|
|||||
3/4
|
10
|
109
|
24485
|
154
|
34599
|
109
|
24485
|
109
|
24485
|
383
|
283
|
541
|
399
|
383
|
283
|
383
|
283
|
|||||
7/8
|
9
|
151
|
33891
|
213
|
47889
|
151 |
33891
|
151
|
33891
|
614
|
453
|
868
|
640
|
614
|
453
|
614
|
453
|
|||||
1
|
8
|
198
|
44499
|
280
|
62879
|
198
|
44499
|
198
|
44499
|
922
|
680
|
1303
|
961
|
922
|
680
|
922
|
680
|
|||||
1-1/8
|
7
|
219
|
49326
|
352
|
79166
|
-
|
-
|
219
|
49326
|
1153
|
850
|
1850
|
1364
|
-
|
-
|
1153
|
850
|
|||||
1-1/4
|
7
|
280
|
62934
|
449
|
101005
|
-
|
-
|
280
|
62934
|
1618
|
1194
|
2597
|
1916
|
-
|
-
|
1618
|
1194
|
|||||
1-3/8
|
6
|
333
|
74796
|
534
|
120043
|
-
|
-
|
333
|
74796
|
2121
|
1565
|
3405
|
2511
|
-
|
-
|
2121
|
1565
|
|||||
1-1/2
|
6
|
406
|
91358
|
652
|
146624
|
-
|
-
|
406
|
91358
|
2806
|
2070
|
4504
|
3322
|
-
|
-
|
1618
|
2070
|
* Grade 5 (~8.8) and Grade 9 (~10.9) according to SAE J 429, Type 2 and type 3 (~8.8) according to ASTM A325
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