44
(c) Insertion of Flare Nut
(d) Flare Processing
Make certain that a clamp bar and copper pipe
have been cleaned.
By means of the clamp bar, perform the flare
processing correctly.
Use either a flare tool for R410A / R32 or
conventional flare tool.
Flare processing dimensions differ according to
the type of flare tool.
When using a conventional flare tool, be sure to
secure “dimension A” by using a gauge for size
adjustment.
Table 6-2-3 Dimensions related to flare processing for R410A or R32 / R22
Table 6-2-4 Flare and flare nut dimensions for R410A or R32
Table 6-2-5 Flare and flare nut dimensions for R22
Nominal
diameter
Outer
diameter
(mm)
Thickness
(mm)
A (mm)
Flare tool for
R410A, R22
clutch type
Conventional flare tool
(R410A or R32)
Conventional flare tool (R22)
Clutch type
Wing nut type
Clutch type
Wing nut type
1/4
6.4
0.8
0 to 0.5
1.0 to 1.5
1.5 to 2.0
0.5 to 1.0
1.0 to 1.5
3/8
9.5
0.8
0 to 0.5
1.0 to 1.5
1.5 to 2.0
0.5 to 1.0
1.0 to 1.5
1/2
12.7
0.8
0 to 0.5
1.0 to 1.5
2.0 to 2.5
0.5 to 1.0
1.5 to 2.0
5/8
15.9
1.0
0 to 0.5
1.0 to 1.5
2.0 to 2.5
0.5 to 1.0
1.5 to 2.0
3/4
19.1
1.2
0 to 0.5
1.0 to 1.5
2.0 to 2.5
-
-
Nominal
diameter
Outer
diameter
(mm)
Thickness
(mm)
Dimension (mm)
Flare nut width
(mm)
A
B
C
D
1/4
6.4
0.8
9.1
9.2
6.5
13
17
3/8
9.5
0.8
13.2
13.5
9.7
20
22
1/2
12.7
0.8
16.6
16.0
12.9
23
26
5/8
15.9
1.0
19.7
19.0
16.0
25
29
3/4
19.1
1.2
24.0
-
19.2
28
36
Nominal
diameter
Outer
diameter
(mm)
Thickness
(mm)
Dimension (mm)
Flare nut width
(mm)
A
B
C
D
1/4
6.4
0.8
9.1
9.2
6.5
13
17
3/8
9.5
0.8
13.0
13.5
9.7
20
22
1/2
12.7
0.8
16.2
16.0
12.9
20
24
5/8
15.9
1.0
19.4
19.0
16.0
23
27
3/4
19.1
1.0
23.3
24.0
19.2
34
36
A
Outer diameter
Fig. 6-2-1 Flare processing dimensions
