ISO 7.2 - 2008

Pipe threads where presure-tight joints are made on the threads.

Plain taper ring gauge No. 4 is available in sizes from 1/16" to 6". Gauges are manufactured from through hardened tool steel and heat treated to a hardness of 60-64 HRc.  

Gauge No. 4

This gauge is a 1:16 taper plain ring gauge and is suitable for checking the major diameter and the related useful thread length of taper external (R) threads. The gauge incorporates a step equal to the total tolerance. (AS ISO 7.2 - 2008 p8) 

Applicable Standard

  • AS ISO 7.2 - 2008
  • Pipe threads where presure-tight joints are made on the threads.
  • Note prevoius standard was AS 1722 Part 1 - 1975.

Delivery

No. 4 gauges from 1/8" to 4"  are held in stock ready for immediate delivery.

 Guide for selecting gauges External threads  (AS ISO 7.2 - 2008 Table A.2)

Thread

Pith diameter together with minor diameter

Useful thread length*

Major diameter

Taper, R

Gauge No. 3

Gauge No. 4

Gauge No. 4

*The threads in the fitting allowance should be checked visually or by other means to ensurethe roots are correctly formed.

 

Reference List

AS ISO 7.2 - 2008   Pipe threads where presure-tight joints are made on the threads. Part 2: Verification by means of limit gauges

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