JIS Fittings and JIS Adapters conform to the JIS B8363 specification. Japanese Industrial Standard (JIS) Fittings and 316 Stainless Steel JIS Fittings, in sizes from 1/8″ up to 2″.
JIS Fittings Tapered Pipe Thread
The Japanese tapered pipe thread connector is identical and interchangeable with the BSPT (tapered) connector. Japanese male thread does not have a 30 ° flare and will not mate with tapered seated BSPP female thread.
The seal on the Japanese tapered pipe thread connector is made on the threads. The use of a thread sealant is recommended. Thread shape according to JIS B 0203 (identical to BSPT)
JIS Fittings 30 ° Flare (female internal taper seat)
This connection uses a 60 ° concave (inverted) seat and parallel threads of British standard pipe. They are not interchangeable with BSPP tapered seat couplings, because the tapered seats are opposite. Thread shape according to JIS B 0202 (identical to BSPP)
Komatsu flared 30 ° (female internal tapered seat)
The threads commonly used on Komatsu equipment (30 ° taper) are metric thread-shaped. Komatsu Style Flange Fitting JIS B 8363
The Komatsu style flange fitting is nearly identical and fully interchangeable with the SAE Code 61 * flange fitting. The dimensions of the O-ring are different between all sizes. When replacing a Komatsu style flange with an SAE style flange, an SAE style O-ring should always be used. * 5/8 ”is not in SAE standards.