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Appendix
Appendix
Installation & Maintenance
Assemblies
Equipment & Accessories
Fittings
Hoses
Fitting Identification
Fitting Standards
Male
JIS 30˚ (Parallel Pipe Threads)
Identification
The male and female have straight threads and a
30-
degree seat.
Seal
The JIS 30-degree male will only connect with the JIS
30-
degree female. The seal is made on the 30-degree seat.
The threads hold the connection in place mechanically.
Comments
The JIC 37-degree flare is very similar to the JIS
30-
degree flare. To determine the difference, carefully
measure the seat angle. The threads on the JIS 30
conform to JIS B 0202. While the BSPP fitting has similar
threads, and also has a 30-degree seat, the JIS 30 is not
interchangeable with the BSPP fitting as the British seat
is inverted.
Thread Identification Table
JIS 30° Flare Parallel
Japanese Thread Types
Female
Dash Size
Nominal
Size
Thread
Size
Male
Thread OD
Female
Thread ID
in.
-2
1/8
1/8-28
3/8
11/32
-4
1/4
1/4-19
17/32
7/16
-6
3/8
3/8-19
21/32
19/32
-8
1/2
1/2-14
13/16
3/4
-10
5/8
5/8-14
29/32
13/16
-12
3/4
3/4-14
1
p
15/16
-16
1
1-11
1
j
1
i
-20
1
e
1
e
-11
1
z
1
x
-24
1
f
1
f
-11
1
d
1
1
-32
2
2-11
2
u
2
s
Male
JIS 30˚ Male Inverted Seat
(
Parallel Pipe Threads) (JIS B 0202)
Identification
The JIS 30 Parallel has straight threads, conforming to
JIS B 0202.
Seal
Both male and female have a straight thread and
30-
degree seat and chamfer. The seal takes place by
compression of the 30-degree seat on the chamfer. The
threads hold the connection mechanically.
Comments
The BSPP fitting is fully interchangeable with the JIS 30,
male inverted seat.
Thread Identification Table
JIS 30° Male Inverted Seat
Female
Dash Size
Nominal
Size
Thread
Size
Male
Thread OD
Female
Thread ID
in.
-4
1/4
1/4-19
8/16
15/32
-6
3/8
3/8-19
21/32
19/32
-8
1/2
1/2-14
13/16
3/4
-12
3/4
3/4-14
1
p
31/32
-16
1
1-11
1
j
1
s
-20
1
e
1
e
-11
1
z
1
l
-24
1
f
1
f
-11
1
d
1
1
-32
2
2-11
2
u
2
e