ISO 261 · manufacturer catalogue dimensions
A straight metric thread with a 30 degree cone seat. The metric counterpart of the JIS 30 degree flare, and not interchangeable with it despite the identical seat.
7 sizes60 degree flanksParallel thread30 degree flare cone or seat
A deep, narrow cone - noticeably more pointed than a 37 degree flare. Common on Japanese equipment, usually with a loose female swivel nut.
Where it seals: Metal to metal, a 30 degree female seat against a 30 degree male cone.
Mating two different cone angles is the classic way to make a joint that holds pressure on the bench and weeps in service: the two cones touch on a line instead of a face, and tightening harder cold-flows the softer of the two rather than sealing it.
Sized by metric thread designation rather than by tube size.
Where you will find it: Komatsu and other Japanese construction equipment.
Also searched as: Komatsu, Komatsu flare, metric 30 degree flare, KOM.
All sizes
| Size | Thread | TPI / pitch | Basic major Ø | Measured across crests | Tube OD | Working pressure |
|---|---|---|---|---|---|---|
| M18 x 1.5 Komatsu 30 | M18 x 1.5 | 1.5 mm pitch | 18 mm / 0.709 in | Not published | M18 x 1.5 metric thread | Manufacturer-specific |
| M22 x 1.5 Komatsu 30 | M22 x 1.5 | 1.5 mm pitch | 22 mm / 0.866 in | Not published | M22 x 1.5 metric thread | Manufacturer-specific |
| M24 x 1.5 Komatsu 30 | M24 x 1.5 | 1.5 mm pitch | 24 mm / 0.945 in | Not published | 16 mm | Manufacturer-specific |
| M30 x 1.5 Komatsu 30 | M30 x 1.5 | 1.5 mm pitch | 30 mm / 1.181 in | Not published | 19 mm | Manufacturer-specific |
| M33 x 1.5 Komatsu 30 | M33 x 1.5 | 1.5 mm pitch | 33 mm / 1.299 in | Not published | 25 mm | Manufacturer-specific |
| M36 x 1.5 Komatsu 30 | M36 x 1.5 | 1.5 mm pitch | 36 mm / 1.417 in | Not published | 32 mm | Manufacturer-specific |
| M42 x 1.5 Komatsu 30 | M42 x 1.5 | 1.5 mm pitch | 42 mm / 1.654 in | Not published | 38 mm | Manufacturer-specific |
No working pressure is published for this standard. No two independent sources in the register give the same figure under conditions they both state, and a generic number would be a decoration rather than a rating. Read it from the manufacturer's catalogue.
On paper
Dimensions are as defined by ISO 261, manufacturer catalogue dimensions. FittingKey is an independent reference and is not affiliated with, endorsed by or approved by any standards body or fitting manufacturer.
Every value on this page was checked against 2 independent published sources:
| Column | Sources | What they gave |
|---|---|---|
| Dash and trade size | gates-idchart, mcgill-id | Two identification guides agree on seven threads. One carries an M14 x 1.5 the other does not, and it is recorded as a gap. |
| Basic major diameter | gates-idchart, mcgill-id | The basic major diameter is the M number, and both charts print exactly that. |
| Tube outside diameter | gates-idchart, mcgill-id | The two disagree on the tube diameter for M18 x 1.5 and M22 x 1.5, so no tube size is published for those two threads. |
Sources disagree: Komatsu tube diameter at M18 x 1.5 and M22 x 1.5.
One chart appears to be giving the inch tube sizes these threads serve converted to millimetres (3/8 in and 1/2 in), the other the nearest metric tube. No tube size is published for those two threads. The thread and the seat are agreed and are what identifies the fitting.