The official name of the parallel pipe screw thread standard ISO
228 is: Pipe Threads Where Pressure-Tight Joints Are Not Made On
This parallel pipe screw thread standard ISO 228 comes in two parts:
ISO 228; 2000: Part 1 Dimensions, Tolerances and Designation
ISO 228; 1987: Part 2 Verification by Means of Limit Gauges
Older standards that define the same thread are: BS
2779; DIN 2999.
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