Photo: All Thread Check Inc. thread ring gages are root relieved for longer gage life and more accurate gaging. The gages are manufactured with a root clearance in the major diameter which eliminates the possibility of interfearence from the full form section of the thread setting plug and major diameter of the part being gaged. This critical feature assures that the thread flanks are making proper contact.

http://www.threadcheck.com/0-80-unf-2a-go-ring-gage/unified-inch-thread-gages/

http://www.threadcheck.com/m16-x-35-6g-go-thread-ring-gage/unified-metric-thread-gages/
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All Thread Check Inc. thread ring gages are root relieved for longer gage life and more accurate gaging. The gages are manufactured with a root clearance in the major diameter which eliminates the possibility of interfearence from the full form section of the thread setting plug and major diameter of the part being gaged. This critical feature assures that the thread flanks are making proper contact.

http://www.threadcheck.com/0-80-unf-2a-go-ring-gage/unified-inch-thread-gages/

http://www.threadcheck.com/m16-x-35-6g-go-thread-ring-gage/unified-metric-thread-gages/