Spi 19-128-8 Class Zz Minus Plug Pin Gage 0.128 in

Product Description

The SPI 19-128-8 is a Class ZZ minus plug pin gage designed for go/no-go dimensional inspection of machined bores, drilled holes, and precision-tolerance features. Manufactured from hardened steel, it checks a nominal hole diameter of 0.128 inches with a minus tolerance of 0.000200 inches, placing it within the Class ZZ specification for inspection-grade gaging tools. Machinists, toolroom technicians, and quality control inspectors use plug pin gages to verify that a feature falls within acceptable dimensional limits before assembly or final inspection sign-off.

This gage is suited for incoming inspection, in-process quality checks, and final part acceptance in machine shops, manufacturing cells, and toolrooms. The 0.128-inch diameter range covers small-bore applications common in precision-machined components. Class ZZ tolerancing makes this gage appropriate for general-purpose inspection work where production-grade accuracy is required without the tighter tolerances of Class Z or Class X gages.

Key Features

• Nominal diameter of 0.128 inches for small-bore and drilled-hole inspection
• Class ZZ minus tolerance of 0.000200 inches for production-grade dimensional verification
• Hardened steel construction for wear resistance and dimensional stability
• Single-ended pin gage format for straightforward go/no-go inspection workflow
• Compact and lightweight at 0.2 pounds for easy bench or portable use

Compatibility

Designed as a Class ZZ minus plug pin gage for general-purpose inspection of 0.128-inch nominal bores and holes in machined parts across manufacturing and toolroom environments.

Installation Notes

Plug pin gages are handled and used by quality control technicians and machinists — no power tools or utilities need to be shut down before use. Clean the gage and bore thoroughly before measurement to avoid false readings caused by debris or oil film. Do not force the gage into a feature; controlled hand pressure is sufficient for accurate go/no-go results. Store in a protective case away from temperature extremes to maintain dimensional integrity.