Coarse Thread Series (English
Units)
(print PDF) |
|
GRADE
1 |
GRADE
2 |
GRADES
5, 5.2 & 5.1 |
GRADES
8, 8.1 & 8.2 |
Thread
Size & Pitch |
Clamp
Load (lb) |
Tightening
Torque (tt-lb) |
Clamp
Load (lb) |
Tightening
Torque (tt-lb) |
Clamp
Load (lb) |
Tightening
Torque (tt-lb) |
Clamp
Load (lb) |
Tightening
Torque (tt-lb) |
|
6 - 32 |
225 |
0.52 |
375 |
0.86 |
579 |
1.33 |
818 |
1.88 |
| 8
- 32 |
347 |
0.95 |
578 |
1.58 |
893 |
2.44 |
1260 |
3.44 |
| 10
- 24 |
433 |
1.37 |
722 |
2.29 |
1116 |
3.53 |
1575 |
4.99 |
| 12
- 24 |
599 |
2.16 |
998 |
3.59 |
1543 |
5.55 |
2178 |
7.84 |
| 1/4
- 20 |
787 |
3.28 |
1312 |
5.47 |
2027 |
8.45 |
2862 |
11.9 |
| 5/16
- 18 |
1297 |
6.75 |
2162 |
11.3 |
3341 |
17.4 |
4716 |
24.6 |
| 3/8
- 16 |
1918 |
12.0 |
3197 |
20.0 |
4941 |
30.9 |
6975 |
43.6 |
| 7/16
- 14 |
2631 |
19.2 |
4385 |
32.0 |
6777 |
49.4 |
9567 |
69.8 |
| 1/2
- 13 |
3512 |
29.3 |
5853 |
48.8 |
9046 |
75.4 |
12771 |
106 |
| 9/16
- 12 |
4505 |
42.2 |
7508 |
70.4 |
11603 |
109 |
16380 |
154 |
| 5/8
- 11 |
5594 |
58.3 |
9323 |
97.1 |
14408 |
150 |
20340 |
212 |
| 3/4
- 10 |
8267 |
103 |
8267 |
103 |
21293 |
266 |
30060 |
376 |
| 7/8
- 9 |
11435 |
167 |
11435 |
167 |
29453 |
430 |
41580 |
606 |
| 1
- 8 |
14999 |
250 |
14999 |
250 |
33633 |
561 |
54540 |
909 |
| 1-1/8
- 7 |
18884 |
354 |
18884 |
354 |
42347 |
794 |
68670 |
1288 |
| 1-1/4
- 7 |
23983 |
500 |
23983 |
500 |
53780 |
1120 |
87210 |
1817 |
| 1-3/8
- 6 |
28586 |
655 |
28586 |
655 |
64103 |
1469 |
103950 |
2382 |
| 1-1/2
- 6 |
34774 |
869 |
34774 |
869 |
77978 |
1949 |
126450 |
3161 |
|
|
Fine Thread Series (English
Units)
(print PDF)
|
|
GRADE
1 |
GRADE
2 |
GRADES
5, 5.2 & 5.1 |
GRADES
8, 8.1 & 8.2 |
| Thread
Size & Pitch |
Clamp
Load (lb) |
Tightening
Torque (tt-lb) |
Clamp
Load (lb) |
Tightening
Torque (tt-lb) |
Clamp
Load (lb) |
Tightening
Torque (tt-lb) |
Clamp
Load (lb) |
Tightening
Torque (tt-lb) |
| 6
- 40 |
251 |
0.58 |
419 |
0.96 |
647 |
1.49 |
914 |
2.10 |
| 8
- 36 |
365 |
1.00 |
608 |
1.66 |
940 |
2.57 |
1327 |
3.63 |
| 10
- 32 |
495 |
1.57 |
825 |
2.61 |
1275 |
4.04 |
1800 |
5.70 |
| 12
-28 |
639 |
2.30 |
1064 |
3.83 |
1645 |
5.92 |
2322 |
8.36 |
| 1/4
- 28 |
901 |
3.75 |
1502 |
6.26 |
2321 |
9.7 |
3276 |
13.7 |
| 5/16
- 24 |
1436 |
7.48 |
2393 |
12.5 |
3698 |
19.3 |
5220 |
27.2 |
| 3/8
- 24 |
2173 |
13.6 |
3622 |
22.6 |
5597 |
35.0 |
7902 |
49.4 |
| 7/16
- 20 |
2938 |
21.4 |
4896 |
35.7 |
7567 |
55.2 |
10683 |
77.9 |
| 1/2
- 20 |
3958 |
33.0 |
6596 |
55.0 |
10194 |
84.9 |
14391 |
120 |
| 9/16
- 18 |
5024 |
47.1 |
8374 |
78.5 |
12941 |
121 |
18270 |
171 |
| 5/8
- 18 |
6336 |
66.0 |
10560 |
110 |
16320 |
170 |
23040 |
240 |
| 3/4
- 16 |
9232 |
115 |
9232 |
115 |
23779 |
297 |
33570 |
420 |
| 7/8
- 14 |
12598 |
184 |
12598 |
184 |
32449 |
473 |
45810 |
668 |
| 1
- 12 |
16409 |
273 |
16409 |
273 |
36797 |
613 |
59670 |
995 |
| 1-1/8
- 12 |
21186 |
397 |
21186 |
397 |
47508 |
891 |
77040 |
1445 |
| 1-1/4
- 12 |
26557 |
553 |
26557 |
553 |
59552 |
1241 |
96570 |
2012 |
| 1-3/8
- 12 |
32546 |
746 |
32546 |
746 |
72983 |
1673 |
118350 |
2712 |
| 1-1/2
- 12 |
39130 |
978 |
39130 |
978 |
87746 |
2194 |
142290 |
3557 |
|
The values presented in these tables are representative and have
been compiled for the user's benefit. Results can be influenced
by any number of variables including: 1) excessive lubrication;
2) excessive design clamp load; 3) nicked or binding threads; 4)
non-parallel mating surfaces; and 5) inadequate torque control,
to name a few. Therefore; C-I, Inc. expressly disclaims
liability of any kind associated with the approach of the data
shown herein. |