If you need to check the calibration of your measuring equipment or gauge parts directly, this VERMONT GAGE 301127040 Go/No Go Plug Gage Assy is the tool for you. The chrome plated plug gage has a 2B class and overall length of 1/2" for the go size and 5/16" for the no-go size. This plus/minus plug gage is made of tool steel and has a thread size of 1/4"-28 UNF with a thread type of UNF. It also has a handle length of 2 3/4". You will want to make sure that your measuring equipment is calibrated correctly with this VERMONT GAGE 301127040 Plus Minus Plug Gage Assy.
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