TM 5-3895-383-24
Table 7
Nuts for 37 Degree Flared Fittings
Outer Diameter
Of the
Nominal Tube
Thread Size
Inch
Standard
Torque
3.18 mm
(.125 inch)
5/16
5.0 1.5 Nm
(4 1 lb-ft)
4.76 mm
(.188 inch)
3/8
11 2 Nm
(8 1 lb-ft)
6.35 mm
(.250 inch)
7/16
16 4 Nm
(12 3 lb-ft)
7.94 mm
(.312 inch)
1/2
20 5 Nm
(15 4 lb-ft)
9.52 mm
(.375 inch)
9/16
25 5 Nm
(18 4 lb-ft)
9.52 mm
(.375 inch)
5/8
35 5 Nm
(26 4 lb-ft)
12.70 mm
(.500 inch)
3/4
50 7 Nm
(37 5 lb-ft)
15.88 mm
(.625 inch)
7/8
65 7 Nm
(48 5 lb-ft)
19.05 mm
(.750 inch)
1 1/16
100 10 Nm
(75 7 lb-ft)
22.22 mm
(.875 inch)
1 3/16
120 10 Nm
(90 7 lb-ft)
25.40 mm
(1.000 inch)
1 5/16
135 15 Nm
(100 11 lb-ft)
31.75 mm
(1.250 inch)
1 5/8
180 15 Nm
(135 11 lb-ft)
38.10 mm
(1.500 inch)
1 7/8
225 15 Nm
(165 15 lb-ft)
50.80 mm
(2.000 inch)
2 1/2
320 30 Nm
(240 22 lb-ft)
NOTE:
Use 50 percent of the torque values from Table 7
when the fitting, the plug or the port material is
nonferrous.
45 Degree Flared and 45 Degree Inverted
Flare Fittings
Illustration 5
(1) 45 degree inverted flared fittings. (2) 45 degree flared
fittings.
Table 8
45 Degree Flared Fittings and
45 Degree Inverted Flare Fittings
Outer Diameter
Of the
Nominal Tube
Thread Size
Inch
Standard
Torque
3.18 mm
(.125 inch)
5/16
5.0 1.5 Nm
(4 1 lb-ft)
4.76 mm
(.188 inch)
3/8
8 1.5 Nm
(6 1 lb-ft)
6.35 mm
(.250 inch)
7/16
11 2 Nm
(8 8 lb-ft)
7.94 mm
(.312 inch)
1/2
17 4 Nm
(13 2 lb-ft)
9.52 mm
(.375 inch)
5/8
30 3 Nm
(22 2 lb-ft)
11.11 mm
(.438 inch)
11/16
30 3 Nm
(22 2 lb-ft)
12.70 mm
(.500 inch)
3/4
38 4 Nm
(28 3 lb-ft)
15.88 mm
(.625 inch)
7/8
50 5 Nm
(37 4 lb-ft)
19.05 mm
(.750 inch)
1 1/16
90 8 Nm
(65 6 lb-ft)
22.22 mm
(.875 inch)
1 1/14
100 10 Nm
(75 7 lb-ft)
Air Conditioning Fittings
SMCS Code: 7553
Illustration 6
(1) O-ring seal. (2) 45 degree flare fitting.
4-8
