TM 5-3805-291-23-1
TORQUE LIMITS - CONTINUED
0234 00
FLARE FITTINGS
37 Degree Flare Fittings
427-C2076
(1) 37 Degree Flare Fitting
(2) Swivel Nuts
Table 15. Nuts for 37 Degree Flare Fittings.
Nominal Outer
Thread Size
Standard Torque
Diameter of the Tube
(In.)
.125 in. (3.18 mm)
5/16
44 13 lb-in. (5.0 1.5 Nm)
.188 in. (4.76 mm)
3/8
100 15 lb-in. (11 2 Nm)
.250 in. (6.35 mm)
7/16
12 3 lb-ft (16 4 Nm)
.312 in. (7.94 mm)
1/2
15 4 lb-ft (20 5 Nm)
.375 in. (9.52 mm)
9/16
18 4 lb-ft (24 5 Nm)
.375 in. (9.52 mm)
5/8
26 4 lb-ft (35 5 Nm)
.500 in. (12.70 mm)
3/4
37 5 lb-ft (50 7 Nm)
.625 in. (15.88 mm)
7/8
48 5 lb-ft (65 7 Nm)
.750 in. (19.05 mm)
1 1/16
75 7 lb-ft (102 9 Nm)
.875 in. (22.22 mm)
1 3/16
90 7 lb-ft (122 9 Nm)
1.000 in. (25.40 mm)
1 5/16
100 11 lb-ft (136 15 Nm)
1.250 in. (31.75 mm)
1 5/8
135 11 lb-ft (183 15 Nm)
1.500 in. (38.10 mm)
1 7/8
165 11 lb-ft (224 15 Nm)
2.000 in. (50.80 mm)
2 1/2
240 22 lb-ft (325 30 Nm)
Note: Use 50 percent of torque values from Table 15 when the fitting or port material is nonferrous.
0234 00-16