Coupling Identification - Japanese
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There are five coupling systems generally used for hydraulic
connections today. They are identified geographically or by
country as:
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Japanese Thread Types
There are two popular coupling styles in Japan:
- All Komatsu equipment uses couplings with a 30° seat
and metric fine threads. All flanges are Code 61 or Code
62 (except -10)*.
- Most other Japanese equipment uses couplings with a 30°
seat and British Standard Pipe Parallel threads, usually
called JIS (Japanese Industrial Standard) couplings. They
are not interchangeable with British couplings, since the
flare is not inverted. All flanges are Code 61 or Code 62
(except -10)*.
*(-10 is a non-SAE size flange)
Japanese 30° Flare Parallel Threads
Japanese Tapered Pipe Thread
Komatsu Style 30° Flare Parallel Threads
Komatsu Style Flange Fitting
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Japanese 30° Flare
Parallel Threads
These Japanese 30° flare male connector will mate with a
Japanese 30° flare female only.
The male and female have straight threads and a 30° seat.
The seal is made on a 30° seat.
The threads on the Japanese 30° flare connector conform
to JIS B 0202, which are the same as the BSPP threads. Both
the British and Japanese connectors have a 30° seat, but
they are not interchangeable, because the British seat is
inverted.
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Dash Size
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Nominal
Size
(in.)
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Thread
Size
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Male
Thread
O.D. (in.)
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Female
Thread
I.D. (in.)
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-2
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1/8
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1/8-28
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3/8
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11/32
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-4
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1/4
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1/4-19
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17/32
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7/16
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-6
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3/8
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3/8-19
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21/32
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19/32
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-8
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1/2
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1/2-14
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13/16
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3/4
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-10
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5/8
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5/8-14
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29/32
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13/16
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-12
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3/4
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3/4-14
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1 1/32
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15/16
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-16
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1
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1-11
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1 5/16
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1 3/16
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-20
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1 1/4
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1 1/4-11
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1 21/32
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1 17/32
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-24
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1 1/2
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1 1/2-11
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1 7/8
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1 25/32
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-32
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2
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2-11
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1 11/32
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2 7/32
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Japanese 30° Flare Parallel Threads
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top of page
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Japanese Tapered Pipe Thread
The Japanese tapered pipe thread connector is identical to
and fully interchangeable with the BSPT (tapered) connector.
The Japanese connector does not have a 30° Flare, and
will not mate with the BSPP female.
The threads conform to JIS B 0203, which are the same as
BSPT threads.
The seal on the Japanese tapered pipe thread connector is
made on the threads.
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Dash Size
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Nominal
Size
(in.)
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Thread
Size
|
Male Parallel
Thread
O.D. (in.)
|
Female Parallel
Thread
I.D. (In.)
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-2
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1/8
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1/8-28
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3/8
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11/32
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-4
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1/4
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1/4-19
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17/32
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7/16
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-6
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3/8
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3/8-19
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21/32
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19/32
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-8
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1/2
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1/2-14
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13/16
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3/4
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-12
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3/4
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3/4-14
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1 1/32
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15/16
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-16
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1
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1-11
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1 5/16
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1 3/16
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-20
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1 1/4
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1 1/4-11
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1 21/32
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1 17/32
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-24
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1 1/2
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1 1/2-11
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1 7/8
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1 25/32
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-32
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2
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2-11
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2 11/32
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2 7/32
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Japanese Tapered Pipe Thread
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top of page
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Komatsu Style 30°
Flare Parallel Threads
The Komatsu Style 30° Flare parallel thread connector
is identical to the Japanese 30° Flare parallel thread
connector except for the threads. The Komatsu style connector
uses Metric fine threads which conform to JIS B 0207.
The Komatsu style connector seals on the 30° Flare.
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Dash Size
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Nominal
Size
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Metric
Thread
Size
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Male
Parallel
Thread
O.D. (mm)
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Female
Parallel
Thread
I.D. (mm)
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(in.)
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(mm)
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-6
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3/8
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9.5
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M18x1.5
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18
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16.5
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-8
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1/2
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13
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M22x1.5
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22
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20.5
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-10
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5/8
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16
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M24x1.5
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24
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22.5
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-12
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3/4
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19
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M30x1.5
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30
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28.5
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-16
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1
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25
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M33x1.5
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33
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31.5
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-20
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1 1/4
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32
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M36x1.5
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36
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34.5
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-24
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1 1/2
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38
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M42x1.5
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42
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40.5
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Komatsu Style 30° Flare Parallel Threads
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Komatsu Style Flange
Fitting
The Komatsu Style Flange fitting is nearly identical
to and fully interchangeable with the SAE Code 61 flange fitting.
In all sizes the O-ring dimensions are different. When replacing
a Komatsu style flange with an SAE style flange, an SAE style
O-ring must always be used.
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Dash Size
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Nominal
Size
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Flange
O.D.
(In.)
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A
(in.)
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B
(in.)
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(in.)
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(mm)
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-8
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1/2
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12.7
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1.188
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.728
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.984
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-10*
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5/8
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15.9
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1.345
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.728
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1.102
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-12
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3/4
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19.1
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1.500
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.846
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1.220
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-16
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1
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25.4
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1.750
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1.122
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1.496
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-20
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1 1/4
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31.8
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2.000
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1.358
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1.732
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-24
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1 1/2
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38.1
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2.375
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1.750
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2.125
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-32
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2
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50.8
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2.812
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2.225
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2.559
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*(-10 is a non-SAE size flange)
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Komatsu Style Flange Fitting
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This page last modified on Tuesday, May 13, 2008.
Copyright 2000 - 2008 JGB Enterprises, Inc.
Phone: (315) 451-2770 ext. 365
Fax: (315) 234-6460
Contact Us
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NOTE:
The product
data on the web site is based on catalog information
from the manufacturer.
JGB is not
responsible for any errors or changes to that data
made by the manufacturer.
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