Image:GaugePlugThreadGoNoGo.jpg

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[edit] Summary

Description	Go NoGo plug gauges with interchangable (replacable) ends. Top gauge is a thread gauge for 1/2 inch BSW. 'Go' end identifies a Pitch diameter of 0.4466" as optimum size, 'NoGo' identifies 0.4516 as the upper limit. Lower gauge is a plain plug gauge of 12.60mm for 'Go' and 12.90mm as 'NoGo' (etched number is a job identification number, probably the job sheet number of the manufactured part it checks)
Source	Own photo
Date	26th March 2005
Author	Glenn McKechnie
Permission	see below

[edit] Licensing

I, the author of this work, hereby publish it under the following licenses:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".