TM 5-3990-264-13&P
0037
HOW TO USE THE TORQUE TABLE - Continued
NOTE
Step (d) is not required for metric screws.
d.
Under the heading THREADS PER INCH, find the number of threads per inch that matches the number
you counted in Step (b).
e.
To find the grade of the screw you are installing, match the markings on the head of the screw to the
correct picture (Figure 3) under CAPSCREW HEAD MARKINGS on the torque table.
Figure 3. Capscrew Head Markings.
f.
Look down the column under the picture you found in Step (e) until you find the torque limit (lb-ft or Nm)
for the diameter and threads per inch of the screw you are installing.
1.
Table 1 lists the torque limits for wet flange nuts.
Table 1.
Torque Limits for Wet Flange Nuts
SPIRALOCK
FLANGE NUT
DIAMETER
THREADS
TORQUE
MARKINGS
GRADE 8
IN.
mm
PER INCH
LB-FT
Nm
1/4
6.35
20
15
20
5/16
7.94
18
25
34
3/8
9.65
16
45
61
1/2
12.70
13
110
149
5/8
15.75
11
210
285
3/4
19.05
10
375
508
2.
Table 2 lists the torque limits for wet socket head capscrews.
03/15/2011Rel(1.8)root(torquewp)wpno(M06021)