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The British Standard Pipe (BSP) technical standards for screw threads has been adopted internationally for interconnecting and sealing pipes and fittings by mating an external (male) thread with an internal (female) thread. It has been adopted as standard in plumbing and pipe fitting. BSPT is also known as R (external thread) and Rc (internal thread), with 1:16 taper thread. It has a pitch angle of 55°
R ISO-based JIS
Taper pipe threads (R) specified in JIS are used to connect fluid equipments, plumbing parts, pipes where density resistance is necessary for their mechanical connection. The Ojiyas gauges for taper pipe threads (R) are used for inspecting the dimension of such the threads.
PT Conventional JIS
Taper pipe threads (PT) specified in JIS are used to connect fluid equipments, plumbing parts, pipes where density resistance is necessary for their mechanical connection. The gauges for taper pipe threads (PT) are used for inspecting the dimension of such the threads.
Female parallel pipe threads are used for male taper pipe threads. Their limit deviation tolerances are different from the female parallel pipe threads (G) or (PF).
Ojiyas (Ojiya Seiki Co., Ltd.) manufactures high quality thread gauge, measuring gauges and various inspection jigs. The company pursues a high level of precision manufacturing technologies and measurements to produce high quality products. Ojiyas products are widely used in various industries – automotive, aerospace, bicycle etc.
Ojiyas gauges undergo heat treatment to attain maximum hardness and increase its resistance to corrosion.
Sub-zero treatment of gauges changes the phase structure and improves the gauge’s quality and performance. Ojiyas gauges undergoes professional sub-zero treatment for better wear resistance & dimensional stability.
You can find out more about the complete Ojiyas range of products by viewing the Ojiyas Catalog on our support page. LFC is the authorized distributor for Ojiyas in Singapore and Indonesia. Contact us if you wish to discuss your gauging applications further.
Ojiyas Taper Pipe Threads
The taper thread plug gauge is used to inspect the coupling between the male taper thread and the female taper thread.
The gauge should stop when it is fitted to the threads to be inspected.
According to conventional JIS (PT), the female taper thread is passed when the inserted taper thread plug ① stops within the range of notch 2c. Similarly, the male taper thread is passed when the inserted taper thread ring ② stops within the range of notch 2b. In the case of taper thread plug (R) ISO-based JIS ③, the female taper thread is passed when the end of inserted taper thread plug stops within the range of T2. And the male taper thread is passed when the inserted taper thread ring (R) ④ stops within the range of T1. The inspection plug (CP) ⑤ is used to confirm whether the effective diameter of taper thread ring (R) ④ exceeds the specified wear limit.
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