The difference between using the right screw and one thats almost right can be the difference between securing a part and ruining it. A screw thread pitch gauge is essential to match a screw or bolt with a threaded fitting or nut. Using the gauge is easy. Reading a thread pitch takes only a moment and can save time that might otherwise be spent cleaning and tapping stripped or cross-threaded fittings.

 A ring gauge, or ring gage, is a cylindrical ring of steel whose inside diameter is finished to gauge tolerance and is used for checking the external diameter of a cylindrical object.

Ring gauges are used for comparative gauging as well as for checking, calibrating, or setting of gauges or other standards. Individual ring gauges or ring gauge sets are made to variety of tolerance grades in metric and English dimensions for master, setting, or working applications.

 Plug gauge There are three main types of ring gauges: go, no go, and master or setting ring gaug

Go ring gauges provide a precision tool for production comparative gauging based on a fixed limit. Go gauges consist of a fixed limit gauge with a gauging limit based on the plus or minus tolerances of the inspected part. A go ring gauges dimensions are based on the maximum OD tolerance of the round bar or part being gauged. A go plug gauges dimensions are based on the minimum thread gauge ID tolerance of the hole or part being gauged. The go plug (ID) gauge should be specified to a plus gaugemakers tolerance from the minimum part tolerance. The go ring (OD) gauge should be specified to a minus gaugemakers tolerance from the maximum part tolerance.

        No-go or not-go gauges provide a precision tool for production comparative gauging based on a fixed limit. No-go gauges consist of a fixed limit gauge with a gauging limit based on the minimum or maximum tolerances of the inspected part. A no-go ring gauges dimensions are based on the minimum OD tolerance of the round bar or part being gauged. The no go ring (OD) gauge should be specified to a plus gaugemakers tolerance from the minimum part tolerance.

           Master and setting ring gauges includes gauge blocks, master or setting discs, and setting rings are types of master gauges used to calibrate or set micrometers, optical comparators, or other gauging systems. Working gauges are used in the shop for dimensional inspection and periodically checked against a master gauge Screw pitch gauge