What is TPG and TRG?

A ring gauge, or ring gage, is a cylindrical ring of a thermally stable material, often steel, whose inside diameter is finished to gauge tolerance and is used for checking the external diameter of a cylindrical object.[1]

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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.

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

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 gauge's dimensions are based on the maximum OD tolerance of the round bar or part being gauged. A go plug gauge's dimensions are based on the minimum 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 gauge's 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.

Link to RTP GAUGE

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.

Similar to gage blocks, ring gauges are sold under different accuracy grades. The higher the grade, the lower the allowable variance from the nominal diameter. This diameter tolerance varies, within each grade, based on the nominal diameter. US standard grades are defined per ANSI/ASME B89.1.5.

Thread Ring Gauges are used for comparative gauging as well as for checking, calibrating, or setting of gauges or other standards. Thread Ring Gauges are manufactured from selected steel, machined and precision lapped and then meticulously inspected in every thread element. We offer these thread ring gauges in different sizes, shapes and dimensions.

A cylinder of heavy metal with threaded ends used to check ID threads. A Thread Plug Gauge is also used to calibrate thread ring gages. This Thread Plug Gauges is made from supreme quality tungsten oil hardened non shrinking steel and latest technology for giving long lasting service, durability and high precision. These Thread Plug Gauges are available in different sizes and shapes based on the specifications of the client.

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