TM 5-3895-382-24
Table 7
Nuts for 37 Degree Flared Fittings
Outer Diameter
Thread Size
Standard
Of the
Inch
Torque
Nominal Tube
3.18 mm
5.0 ± 1.5 Nm
(.125 inch)
5/16
(4 ± 1 lb-ft)
4.76 mm
11 ± 2 Nm
(.188 inch)
3/8
(8 ± 1 lb-ft)
6.35 mm
16 ± 4 Nm
(.250 inch)
7/16
(12 ± 3 lb-ft)
7.94 mm
20 ± 5 Nm
(.312 inch)
1/2
(15 ± 4 lb-ft)
9.52 mm
25 ± 5 Nm
(.375 inch)
9/16
18 ± 4 lb-ft)
9.52 mm
35 ± 5 Nm
(.375 inch)
5/8
(26 ± 4 lb-ft)
12.70 mm
50 ± 7 Nm
(.500 inch)
3/4
(37 ± 5 lb-ft)
15.88 mm
65 ± 7 Nm
(.625 inch)
7/8
(48 ± 5 lb-ft)
19.05 mm
100 ± 10 N m
(.750 inch)
1 1/16
(75 ± 7 lb-ft)
22.22 mm
120 ± 10 N m
(.875 inch)
1 3/16
(90 ± 7 lb-ft)
25.40 mm
135 ± 15 N m
(1.000 inch)
1 5/16
(100 ± 11 lb-ft)
31.75 mm
180 ± 15 N m
(1.250 inch)
1 5/8
(135 ± 11 lb-ft)
38.10 mm
225 ± 15 N m
(1.500 inch)
1 7/8
(165 11 lb-ft)
50.80 mm
320 ± 30 N m
(2.000 inch)
2 1/2
(240 ± 22 lb-ft)
NOTE:
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
Thread Size
Standard
Of the
Inch
Torque
Nominal Tube
3.18 mm
5.0 ± 1.5 Nm
(.125 inch)
5/16
(4 ± 1 lb-ft)
4.76 mm
8 ± 1.5 Nm
(.188 inch)
3/8
(6 ± 1 lb-ft)
6.35 mm
11 ± 2 Nm
(.250 inch)
7/16
(8 ± 1 lb-ft)
7.94 mm
17 ± 3 Nm
(.312 inch)
1/2
(13 ± 2 lb-ft)
9.52 mm
30 ± 3 Nm
(.375 inch)
5/8
(22 ± 2 lb-ft)
11.11 mm
30 ± 3 Nm
(.438 inch)
1 1/16
(22 ± 2 lb-ft)
12.70 mm
38 ± 4 Nm
(.500 inch)
3/4
(28 ± 3 lb-ft)
15.88 mm
50 ± 5 Nm
(.625 inch)
7/8
(37 ± 4 lb-ft)
19.05 mm
90 ± 8 Nm
(.750 inch)
1 1/16
(65 ± 6 lb-ft)
22.22 mm
100 ± 10 N m
(.875 inch)
1 1/14
(75 ± 7 lb-ft)
Air Conditioning Fittings
SMCS Code: 7553
Illustration 6
(1) O-ring seal. (2) 45 degree flare fitting.
4-8
