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JIS 30° Flare connections include the series of inch (BSP) threads and metric threads. This section is dedicated to JIS 30° Flare Metric, or “KOMATSU” connection (due to its near exclusive use on KOMATSU brand equipment).

Measurement Procedure:
1) With calipers, measure the O.D. (outside diameter) of the male threads or the I.D. (inside diameter) of the Female Threads.

2) Check the thread pitch with thread pitch gauge.

3) Check the flare angle (30°) with the seat angle gauge.

4) Compare measurements against chart.

Dash Size Thread Pitch Male Thread O.D.

mm | inch
Female Thread I.D.

mm | inch
12 1.5 12 | .472 10.5 | .473
14 1.5 14 | .551 12.5 | .492
16 1.5 16 | .630 14.5 | .571
18 1.5 18 | .709 16.5 | .650
20 1.5 20 | .787 18.5 | .728
22 1.5 22 | .866 20.5 | .807
24 1.5 24 | .945 22.5 | .886
30 1.5 30 | 1.181 28.5 | 1.122
33 1.5 33 | 1.299 31.5 | 1.240
36 1.5 36 | 1.417 34.5 | 1.358
42 1.5 42 | 1.654 40.5 | 1.594