Spi 29-197-1 Class Zz Plus Plug Gage 0.197 in

Product Description

The SPI 29-197-1 is a Class ZZ Plus plug gage designed for precision bore and hole measurement in machining, inspection, and quality control applications. Built to Class ZZ Plus tolerances of 0.0002 inches, this gage provides reliable go/no-go verification for a 0.197-inch nominal diameter. The steel construction ensures durability under repeated use in shop-floor and inspection environments. Licensed metrology technicians, machinists, and quality inspectors rely on plug gages like this one to confirm that drilled, reamed, or punched holes meet drawing callout specifications without the variability of handheld measuring tools.

This plug gage is suited for use in manufacturing, tool and die, aerospace, and general metalworking shops where tight-tolerance hole verification is required. It is appropriate for both incoming inspection of raw components and in-process verification during production runs. The 0.197-inch diameter makes it a practical fit for small-bore inspection tasks where micrometer or caliper measurement may introduce operator error. Typical users include QC inspectors and machinists working to ASME B89.1.5 or similar gage-tolerance standards.

Key Features

• Class ZZ Plus tolerance rating at 0.0002 inches for precise hole verification
• 0.197-inch nominal measurement diameter for small-bore applications
• Steel construction for wear resistance and dimensional stability
• Compact form factor suited for bench inspection and in-process use
• Single-piece package for individual replacement or kit supplementation

Compatibility

Designed as a standard Class ZZ Plus plug gage for go/no-go inspection of 0.197-inch nominal diameter holes in steel, aluminum, and similar workpiece materials.

Installation Notes

Plug gages are handled and used by trained machinists or metrology technicians following established gage-handling procedures. Clean the gage and workpiece bore thoroughly before use to prevent false readings caused by chips or coolant residue. Store the gage in its protective case when not in use to prevent surface damage that would affect measurement accuracy. Do not force the gage into an undersized hole, as this can damage the gage surface and compromise tolerance integrity.