SELECTION OF PIPE SIZE
Coupling size of brazed pipe
(Unit: mm)
Screw size and tightening torque
Connected section
External size
Internal size
Standard outer dia.
of connected
copper pipe
Connected section
Min. thickness
of coupling
External size
Internal size
Min. depth of
insertion
Oval value
Standard outer dia.
(Allowable difference)
C
F
K
G
6.35
6.35 (±0.03)
6.45 (
)
7
6
0.06 or less
0.50
9.52
9.52 (±0.03)
9.62 (
)
8
7
0.08 or less
0.60
12.70
12.70 (±0.03)
12.81 (
)
9
8
0.10 or less
0.70
15.88
15.88 (±0.03)
16.00 (
)
9
8
0.13 or less
0.80
19.05
19.05 (±0.03)
19.19 (
)
11
10
0.15 or less
0.80
22.22
22.22 (±0.03)
22.36 (
)
11
10
0.16 or less
0.82
28.58
28.58 (±0.04)
28.75 (
)
13
12
0.20 or less
1.00
Screw size
Tightening torque
(N•m)
0
.
3
o
t
5
.
2
6
M
l
a
n
i
m
r
e
t
y
l
p
p
u
s
r
e
w
o
P
6
.
6
o
t
5
.
5
8
M
w
e
r
c
s
h
t
r
a
E
1.2 to 1.4
l
a
n
i
m
r
e
t
e
r
i
w
n
o
i
t
a
c
i
n
u
m
m
o
C
K
ØC
G
ØF
+0.04
-0.02
+0.04
-0.02
+0.04
-0.02
+0.04
-0.02
+0.03
-0.03
+0.03
-0.03
+0.06
-0.02
M
4
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