TM 5-2420-230-24-1
(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 with 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
(lbf/ft or Nm) for the diameter and threads
per inch of the screw you are installing.
(7)
Use wet torque values.
Table E-1. Torque Limits for Wet Flange Nuts.
SPIRALOCK FLANGE
DIAMETER
TORQUE
THREADS
NUT MARKINGS
PER INCH
IN.
MM
LBF/FT
NM
GRADE 8
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 E-1. Torque Limits for Wet Socket Head Capscrews.
TORQUE IN LBF/FT (CAPSCREWS) LUBED
SIZE
SOC HD OR 12 PT
SOC FLAT HD
.1024
55
2.5
.2520
12
6
.3118
25
12
.3816
44
22
.5013
70
36
.5612
106
53
.6211
212
106
.7510
375
187
1.008
781
--
E-2
