Glastonbury Southern Gage
Glastonbury Southern Gage Company is the largest manufacturer in the USA of thread gages (plug and ring), as well as cylindrical plug and ring gages, surveillance masters, thread wires, CMM and vision verification gages, and optical flats. In fact, they have the largest on-the-shelf stock of thread gages. Also, their line of Centerline Flex Plug Gages allow fast and accurate inspection of threaded hole locations with your coordinate measuring machine.