Spi 29-347-2 Class Zz Plus Plug Gage 0.347 in Dia

Product Description

The SPI 29-347-2 is a Class ZZ Plus plug gage used to verify bore and hole diameters with a nominal measurement diameter of 0.347 inches and a tolerance of 0.0002 inches. Class ZZ is a working-grade tolerance class suited for production inspection where a precise go/no-go check is required. The gage is constructed from steel for durability and dimensional stability over repeated use. Machinists, quality control technicians, and tool-and-die professionals use plug gages like this one to confirm that drilled, reamed, or bored features fall within acceptable limits without relying on variable measuring instruments.

This plug gage is appropriate for shop-floor inspection of small-diameter holes in manufacturing and precision machining environments, both in job shops and production facilities. It is used wherever a quick, reliable attribute check of a 0.347-inch hole is needed, including fixture verification, incoming inspection of machined components, and process control during drilling or reaming operations. The single-ended design and compact form factor make it practical for use at the machine or at an inspection bench.

Key Features

• Nominal measurement diameter of 0.347 inches for direct go/no-go hole inspection
• Class ZZ Plus tolerance of 0.0002 inches provides working-grade accuracy for production use
• Steel construction for wear resistance and long service life
• Compact and lightweight at 0.2 pounds for easy handling at the machine or bench
• Single-unit packaging suits individual replacement or toolbox stocking

Compatibility

Designed as a working-grade attribute gage for inspection of 0.347-inch nominal diameter holes in machined components across general manufacturing and precision machining applications.

Installation Notes

Plug gages are used by machinists and quality control technicians and require no permanent installation. Before use, ensure the gage and workpiece are at the same ambient temperature to avoid thermal expansion errors. Clean the gage and the hole being checked before each measurement to prevent debris from causing false rejections or gage wear. Store the gage in its protective case when not in use to preserve dimensional accuracy.