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There are two popular coupling styles in Japan:
1. All Komatsu equipment uses couplings with a 30° seat and metric fine threads.
All flanges are Code 61 or Code 62 (except -10)*.
2. 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)*.
Japanese 30° Flare Parallel Threads
These Japanese 30° flare male connectors 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 the 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.
Japanese 30° Flare
| Dash Size |
Nominal Size (In.) |
Thread Size |
Male Parallel Thread O.D. (In.) |
Female Parallel Thread I.D. (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 1/32 |
15/16 |
| -16 |
1 |
1-11 |
1 5/16 |
1 3/16 |
| -20 |
1 1/4 |
1 1/4 -11 |
1 21/32 |
1 17/32 |
| -24 |
1 1/2 |
1 1/2 -11 |
1 7/8 |
1 25/32 |
| -32 |
2 |
2-11 |
2 11/32 |
2 7/32 |
| * (-10 is a non-SAE size flange) |
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