Nominal
diameter
Outside
diameter
(mm)
Wall
thickness
(mm)
A (mm)
R410A flaring
tool, clutch
type
Conventional flaring tool
Clutch type Wing-nut type
1/4 6.35 0.8 0 - 0.5 0.5 - 1.0 1.0 - 1.5
3/8 9.52 0.8 0 - 0.5 0.5 - 1.0 1.0 - 1.5
1/2 12.70 0.8 0 - 0.5 0.5 - 1.0 1.5 - 2.0
Table 13 R410A flaring and flare nut dimensions Unit: mm
Nominal
diameter
Outside
diameter
(mm)
Wall
thickness
(mm)
A +0, -0.4 B
dimension
C
dimension
D
dimension
Flare
width
1/4 6.35 0.8 9.1 9.2 6.5 13 17
3/8 9.52 0.8 13.2 13.5 9.7 20 22
1/2 12.70 0.8 16.6 16.0 12.9 23 26
Table 14 R410A flaring and flare nut dimensions Unit: mm
Nominal
diameter
Outside
diameter
(mm)
Wall
thickness
(mm)
A +0, -0.4 B
dimension
C
dimension
D
dimension
Flare
width
1/4 6.35 0.8 9.0 9.2 6.5 13 17
3/8 9.52 0.8 13.0 13.5 9.7 20 22
1/2 12.70 0.8 16.2 16.0 12.9 20 24
2. Procedure and precautions for flare connection
A. Check to make sure there are no scratches, dust, etc., on the
flare and union.
B. Align the flared surface with the axial center of the union.
C. Use a torque wrench, and tighten to the specified torque. The
tightening torque for R410A is the same as the conventional
torque value for R22. Be careful, because if the torque is too
weak, it may lead to a gas leak. If it is too strong, itmay split the
flare nut or make it impossible to remove the flare nut.
Table 15 R410A tightening torque
Nominal
diameter
Outside
diameter (mm)
Tightening torque
N.m (kgf.cm)
Torque wrench
tightening torque
N.m (kgf.cm)
1/4 6.35 14 - 18 (140 - 180) 18 (180)
3/8 9.52 33 - 42 (330 -420) 42 (420)
1/2 12.70 55 (550) 55 (550)
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