TM 5-3805-290-23-1
TORQUE LIMITS - CONTINUED
0207 00
FLARE FITTINGS
37 Degree Flare Fittings
427-B0165
Table 15. Nuts for 37 Degree Flare Fittings.
Nominal Outer
Thread Size
Standard Torque
Diameter of the Tube
(Inches)
.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% of torque values from Table 15 when the fitting or port material is nonferrous.
0207 00-16
