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Page Title:
Table E-1. Torque Limits for Wet Flange Nuts |
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 TM 10-3930-673-20-1
f. Look down the column under the picture you found in
Capscrew Head Markings
Step e. until you find the torque limit (lb-ft or Nm) for the
diameter and threads per inch of the screw you are
Metric screws are of three grades:
Manufacturer's marks may vary.
8.8, 10.9, and 12.9. Grades and
These are all SAE Grade 5 (3-
installing.
manufacturer's marks appear on
line).
the screw head.
8.8
10.9
12.9
Standard
Metric
Diameter
Torque
Threads
Spiralock Flange Nut
per inch
Markings Grade 8
In.
mm
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
SL
5/8
15.87
11
210
285
3/4
19.05
10
375
508
Torque in Ft Lbs (Capscrews) Lubed
Socket Head/12 Pt.
Size
Socket Head or 12 Pt
Socket Flat Head
0.10-24
5
2.5
0.25-20
12
6
0.31-18
25
12
0.38-16
44
22
0.50-13
70
36
Socket Flat Head
0.56-12
106
53
0.62-11
212
106
0.75-10
375
187
1.00-8
781
E-2
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