FUSED-PAD SELF-LOCKING FASTENERS
Specification No. 124, September 1973, for class 2A bolts in class 2B nuts
Note:
The imperial unit of torque measurement is - inch - lb (force) and the
Metric unit is
the Newton-Metre and is designated by Nm.
For Conversion - 1
inch-lb = .113 Nm
|
Max Prev. Torque |
Minimum Prevailing Torques |
|||||||
|
1st Installation |
1st Removal |
5th Removal |
||||||
|
Imp. Diam. |
Metric Diam. |
Inch-lb |
Nm. |
Inch-lb |
Nm approx |
Inch-lb |
Nm approx |
|
|
1.8" |
3mm |
8 |
.9 |
2 |
.23 |
1 |
.11 |
|
| . |
4mm |
13 |
1.47 |
2.5 |
.28 |
1.5 |
0.17 |
|
|
3/16" |
5mm |
18 |
2.0 |
3 |
.34 |
2 |
.23 |
|
|
1/4" |
6mm |
40 |
4.5 |
5 |
.57 |
3 |
.34 |
|
|
5/16" |
8mm |
85 |
9.6 |
8 |
.9 |
5 |
.57 |
|
|
3/8" |
10mm |
110 |
12.4 |
14 |
1.6 |
9 |
1.0 |
|
|
7/16" |
11mm |
150 |
17.0 |
20 |
2.3 |
12 |
1.4 |
|
|
1/2" |
12mm |
220 |
24.9 |
26 |
2.9 |
16 |
1.8 |
|
|
9/16" |
14mm |
270 |
29.9 |
35 |
4.0 |
22 |
2.5 |
|
|
5/8" |
16mm |
350 |
39.6 |
45 |
5.1 |
30 |
3.4 |
|
|
3/4" |
20mm |
460 |
52.0 |
60 |
6.8 |
45 |
5.1 |
|
|
7/8" |
22mm |
700 |
79.1 |
95 |
10.7 |
65 |
7.4 |
|
|
1" |
25mm |
900 |
101.7 |
130 |
14.7 |
85 |
9.6 |
|
A standard
locking element will normally cover up to 1 1/2 diameters in length and
approximately 150
degrees of circumference, at its central point.