TM 5-6675-348-13&P
(2)
Measure out 1 in. with a ruler and
count the number of threads per inch.
(3)
Under the heading SIZE, look down
the left-hand column until you find
the diameter of the screw you are
installing (there will usually be two
lines beginning with the same size).
(4)
In the second column under SIZE, find
the number of threads per inch that
matches the number of threads per
inch you counted in Step (2). (Not
required for metric screws.)
(5)
To find the grade screw you are
installing, match the markings on the
head to the correct picture of
CAPSCREW HEAD MARKINGS on
the torque table.
(6)
Look down the column under the
picture you found in Step (5). until you
find the torque limit (lb-ft or Nm) for
the diameter and threads per inch of
the screw you are installing.
(7)
Use wet torque values.
Table J-1. Torque Limits for Wet Flange Nuts
Diameter
Torque
Spiralock Flange Nut
Threads
Markings Grade 8
In.
mm
per In.
lb-ft
Nm
1/4
6.35
20
15
20
5/16
7.94
18
25
34
3/8
9.53
16
45
61
1/2
12.70
13
110
149
5/8
15.87
11
210
285
3/4
19.05
10
375
508
Table J-2. Torque Limits for Wet Socket Head Capscrews
Torque in Ft Lb (Capscrews) Lubed
Size
Socket Head or 12 Pt
Socket Flat Head
0.10-24
55
2.5
0.25-20
12
6
0.31-18
25
12
0.38-16
44
22
0.50-13
70
36
