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Type 'G' Thread?

Type 'G' Thread?

Type 'G' Thread?

(OP)
Does anyone have any information on this thread standard?  Specifically I have seen it referenced as G1/2A and G2-1/2.  Are these perhaps a metric version of a tapered thread like NPT?

Thanks in advance for any help/advice.

RE: Type 'G' Thread?

MOST METRIC COUNTRIES IN EUROPE AND ASIA USE THE BRITISH BASED INCH SYSTEM (ISO) FOR MEASURING PIPE AND TUBING THREADS.  THREADS EQUIVALENT TO BSPP/BSPF (BRITISH STANDARD PIPE - PARALLEL) ARE DESIGNATED IN GERMANY AS: G 1/4.  THE REFERENCE STANDARDS FOR ISO R228 PARALLEL PIPE THREAD ARE DESIGNATED AS: GERMANY - DIN 259

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