(Sunnen Products: St. Louis) -- From Sunnen Products Co., manufacturer and distributor of bore sizing machines and engine-building products, the PG bore gauge takes an intuitive approach to hole gauging with a mechanical design and speedometer-type scale for quick visual confirmation of inside diameter.

The gauge combines lab-precision accuracy (±0.000025 in./0.0006 mm) with a shop-hardened design that is compact, portable, and mountable on machining stations. PG gauges can be used to examine the entire bore for diameter, taper, barrel, bell mouth, out-of-round, and lobing.

A sliding face plate with adjustable stops permits end-to-end examination of bores. Stops can be set to allow examination of a particular section of the bore, with accuracy right up to the edge of ports, lands, and ends. The speedometer-type scale provides read-outs down to 0.000050 in. (0.001 mm) for 100-percent inspection of machining operations or fast sampling of large vendor lots. Various models are available for gauging inside diameters from 0.090 in. to 4.310 in. Metric models cover inside diameters from 2.0 mm to 109.47 mm.

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