– 31 –
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
1/4
3/8
1/2
5/8
3/4
Outer diameter
(mm)
6.4
9.5
12.7
15.9
19.1
Thickness
(mm)
0.8
0.8
0.8
1.0
1.0
Dimension (mm)
A
B
C
D
9.1
9.2
6.5
13
13.0
13.5
9.7
20
16.2
16.0
12.9
20
19.4
19.0
16.0
23
23.3
24.0
19.2
34
Flare nut width
(mm)
17
22
24
27
36
Nominal
diameter
1/4
3/8
1/2
5/8
3/4
Outer diameter
(mm)
6.4
9.5
12.7
15.9
19.1
Thickness
(mm)
0.8
0.8
0.8
1.0
1.2
Dimension (mm)
A
B
C
D
9.1
9.2
6.5
13
13.2
13.5
9.7
20
16.6
16.0
12.9
23
19.7
19.0
16.0
25
24.0
—
19.2
28
Flare nut width
(mm)
17
22
26
29
36
Nominal
diameter
1/4
3/8
1/2
5/8
3/4
Outer
diameter
(mm)
6.4
9.5
12.7
15.9
19.1
Thickness
(mm)
0.8
0.8
0.8
1.0
1.2
A (mm)
Flare tool for
R410A, R22
clutch type
0 to 0.5
0 to 0.5
0 to 0.5
0 to 0.5
0 to 0.5
Conventional flare tool
(R410A or R32)
Clutch type
Wing nut type
1.0 to 1.5
1.5 to 2.0
1.0 to 1.5
1.5 to 2.0
1.0 to 1.5
2.0 to 2.5
1.0 to 1.5
2.0 to 2.5
1.0 to 1.5
2.0 to 2.5
Conventional flare tool
(R22)
Clutch type
Wing nut type
0.5 to 1.0
1.0 to 1.5
0.5 to 1.0
1.0 to 1.5
0.5 to 1.0
1.5 to 2.0
0.5 to 1.0
1.5 to 2.0
—
—
Fig. 6-2-1 Flare processing dimensions
A
ØD
