---
title: "International Thread Types: Japanese Pipe Threads"
description: Learn about international thread types, such as identifying and understanding combinations with Japanese pipe threads.
image: https://blog.brennaninc.com/hubfs/dominik-vanyi-1HEDPbH6HIE-unsplash.jpg
---
[](https://brennaninc.com/)
Posted on [December 12, 2019](https://blog.brennaninc.com/japanese-threads)
# International Thread Types: Japanese Pipe Threads
Written by
### [Ally Pulskamp](https://blog.brennaninc.com/author/ally-pulskamp)
Posted in
[Thread Identification & Measurement](https://blog.brennaninc.com/topic/thread-identification-measurement)
### **Japanese Threads**
As a leading Japanese equipment manufacturer, all of Komatsu® Limited’s equipment uses Japanese couplings with a 30° seat and metric fine Japanese pipe threads. Most other Japanese heavy equipment manufacturers use fittings with a 30° seat and [BSPP](https://brennaninc.com/fitting-identification-introduction/) (British Standard Pipe Parallel) threads. This combination is referred to as JIS (Japanese Industrial Standard). However, they are not interchangeable with standard British couplings because[JIC](https://brennaninc.com/fitting-identification-introduction/) fittings do not have an inverted flare.
Primary Japanese threads include:
- Japanese Tapered Pipe Thread
- Japanese 30° Flare Parallel Threads
Japanese 30° flare male threads will only mate with Japanese 30° flare female because the male and female incorporate straight threads with a 30° seat where the seal is made.
Though both Japanese 30° flare and BSPP have a 30° seat and each conform to JIS B 0202 they are not interchangeable due to the British inverted seat.
And like U.S. manufacturer Caterpillar, Komatsu’s fittings are mostly unique to them.
- Komatsu Style Flange Fittings, Code 61 or Code 62
- Komatsu Style 30° Flare Parallel Threads
The Komatsu and Japanese 30° flare parallel connectors are identical except for the threads, so are not compatible. Komatsu uses metric fine threads conforming to JIS B 0207 and Japanese 30° conform to JIS B 0202.
[](https://hubspot-cta-redirect-eu1-prod.s3.amazonaws.com/cta/redirect/1793404/201e8b37-e225-414d-977f-d23fccf7b5ff)
[International Flanges: JIS 4-Bolt](https://blog.brennaninc.com/-jis-4-bolt) [International Flanges: GAZ Poclain 24° Flange](https://blog.brennaninc.com/international-flanges-gaz-poclain-24-flange)
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