TM 5-3895-383-24
Table 9
Air Conditioning Fittings
O-Ring Fitting End
45 Degree Flare
Fitting End
Thread
Size
Inch
Standard
Torque
Steel
Tubes
Standard
Torque
Aluminum
Tubes
Standard
Torque
5/8 - 18
14 4 Nm
(10 3 lb-ft)
30 3 Nm
(22 2 lb-ft)
23 3 Nm
(17 2 lb-ft)
3/4 - 16
27 4 Nm
(20 3 lb-ft)
52 5 Nm
(38 4 lb-ft)
33 4 Nm
(24 4 lb-ft)
7/8 - 14
40 4 Nm
(30 3 lb-ft)
60 7 Nm
(44 5 lb-ft)
38 4 Nm
(28 3 lb-ft)
1 1/16 - 14
45 5 Nm
(33 4 lb-ft)
75 8 Nm
(55 6 lb-ft)
50 5 Nm
(37 4 lb-ft)
Tapered Pipe Thread Fittings
SMCS Code: 7553
Table 10
Tapered Pipe for Thread Fittings
Standard Torque
Thread Size
Of the Pipe
Inch
Threads with
5p - 3413
Pipe Sealant
Threads without
Pipe Sealant
1/16 - 27
10 Nm (7 lb-ft)
10 Nm (7 lb-ft)
1/ - 27
16 Nm (12 lb-ft)
16 Nm (12 lb-ft)
1/4 - 18
20 Nm (15 lb-ft)
25 Nm (18 lb-ft)
3/8 - 18
35 Nm (26 lb-ft)
45 Nm (3 lb-ft)
1/2 - 14
45 Nm (33 lb-ft)
60 Nm (4 lb-ft)
3/4 - 14
60 Nm (4 lb-ft)
75 Nm (55 lb-ft)
1 - 11 12
75 Nm (55 lb-ft)
90 Nm (65 lb-ft)
1 1/4 - 11 1/2
90 Nm (65 lb-ft)
110 N m (80 lb-ft)
11 - 11 1/2
110 N m (80 lb-ft)
130 N m (95 lb-ft)
2 - 11 1/2
130 N m (95 lb-ft)
160 N m (120 lb-ft)
NOTE:
Use 50 percent of the torque values from Table 10
when the fitting, the plug or the port material is
nonferrous.
Tightening Other Fittings
SMCS Code: 7553
Hi Duty Tube Fittings (Shear Sleeve)
Illustration 7
After the tube has been put through the nut and after the tube
makes contact against the tube shoulder in the fitting body,
turn the nut with a wrench until a small decrease in torque Is
felt. The small decrease in torque indicates that the sleeve has
been broken off of the nut. Hold the tube in order to prevent
the tube from turning. Tighten the nut for an additional 1-1/2
turns.
Hi Seal Fittings
Illustration 8
Put the nut and the sleeve over the tubing so that the end of
the sleeve that is short and heavy is facing the end of the
tubing. Put the tube end against the counterbore in the body of
the fitting and tighten the nut until the nut is over the last thread
on the body. The remainder of the space is used whenever
the fitting is removed and installed again.
Tube Fittings that are Not Flared
Illustration 9
4-9
