TM 5-3895-382-24
Table 4
Inch Taperlock Studs
Thread Size
Inch
Standard Torque
1/4
8 ± 3 Nm (6 ± 2 lb-ft)
5/16
17± 5 Nm (13 ± 4 lb-ft)
3/8
35 ± 5 Nm (26 ± 4 lb-ft)
7/16
45 ± 10 N m (33 ± 7 lb-ft)
1/2
65 ± 10 N m (48 ± 7 lb-ft)
5/8
110 ± 20 N m (80 ± 15 lb-ft)
3/4
170 ± 30 N m (125 ± 22 lb-ft)
7/8
260 ± 40 N m (190 ± 30 lb-ft)
1
400 ± 60 N m (300 ± 44 lb-ft)
1 1/8
525 ± 60 N m (390 ± 44 lb-ft)
1 1/4
750 ± 80 N m (550 ± 60 lb-ft)
1 3/8
950 ± 125 Nm (700 ± 90 lb-ft)
1 1/2
1200 ± 150 Nm (880 ± 110 lb-ft)
Standard Torque for O-Ring Face Seal Fittings and
37 Degree Flared Fittings
SMCS Code: 7553
Illustration 1
(A) O-ring face seal. (B) 37 degree flare. (C) O-ring plug with a
hexagon head. (1) O-ring seal. (2) Hexagon head.
Table 5
Ferrous Straight Thread O-Ring Fitting Torques for
Mating with Ferrous Materials
Outer Diameter
of the
Nominal Tube
Thread Size
Inch
Standard
Torque
3.18 mm
(.125 inch)
5/16 - 24
5.0 ± 1.5 Nm
(4 ± 1 lb-ft)
4.76 mm
(.188 inch)
3/8 - 24
12 ± 2 Nm
(9 ± 1 lb-ft)
6.35 mm
(.250 inch)
7/16 - 20
22 ± 2 Nm
(16 ± 1 lb-ft)
7.94 mm
(.312 inch)
1/2 - 20
30 ± 3 Nm
(22 ± 2 lb-ft)
9.52 mm
(.375 inch)
9/16 - 18
48 ± 5 Nm
(35 ± 4 lb-ft)
12.70 mm
(.500 inch)
3/4 - 16
82 ± 8 Nm
(60 ± 6 lb-ft)
15.88 mm
(.625 inch)
7/8 - 14
143 ± 15 N m
(105 ± 11 lb-ft)
19.05 mm
(.750 inch)
1 1/16 - 12
190 ± 20 N m
(140 ± 15 lb-ft)
22.22 mm
(.875 inch)
1 3/16 - 12
250 ± 25 N m
(185 ± 18 lb-ft)
25.40 mm
(1.000 inch)
1 5/16 - 12
300 ± 30 N m
(220 ± 22 lb-ft)
31.75 mm
(1.250 inch)
1 5/8 - 12
350 ± 30 N m
(260 ± 22 lb-ft)
38.10 mm
(1.500 inch)
1 7/8 - 12
430 ± 40 N m
(320 ± 30 lb-ft)
50.80 mm
(2.000 inch)
2 1/2 - 12
450 ± 45 N m
(330 ± 33 lb-ft)
NOTE: Use 50 percent of the torque
values from Table 5 when the
fitting, the plug or the port
material is nonferrous.
4-5
