Rc 1/8 Metric Pipe Tap Information

Written by les moore
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Rc 1/8 Metric Pipe Tap Information
Pipes can be threaded with a straight or tapered thread. (rusty metal pipe 2 image by jbattx from Fotolia.com)

British standard pipe taper (BSPT) internal thread is called Rc by the International Organization for Standardization (ISO). Rc refers to an internal, tapered thread that decreases along the length of the thread at a taper rate of 3/4-inch per foot.

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1/8 Pipe

A 1/8-inch pipe has an outside diameter (OD) of 10.30mm. Its internal diameter is 9.0mm.

Thread Pitch

The thread pitch is the distance between the threads. For 1/8-inch pipe, the pitch is .907mm between each thread and 28 threads per 25.4mm. The thread is normally right-hand tapped. Tapping pipe for left-hand assembly, is designated as LH in the thread designation.

Thread Diameter

The thread diameter for 1/8-inch pipe is 9.728mm. It is an internal thread and tapers so the diameter gets smaller the deeper the thread goes into the pipe.

Pipe Tap Information

Information for Rc and other pipe tap information is available in charts, manufacturers' and printed sources.

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