Spi 19-175-9 Class Zz Minus Plug Pin Gage 0.175 in

Product Description

The SPI 19-175-9 is a Class ZZ minus plug pin gage machined from steel, used to verify that a hole or bore meets its minimum acceptable size. This gage measures 0.175 inches in diameter and holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work on the shop floor or in a quality-control environment. Class ZZ is the standard precision class for production gaging, balancing cost-effective manufacturing with reliable dimensional verification. Machinists, tool-and-die makers, and QC inspectors use pin gages like this one to confirm drilled, reamed, or punched hole sizes before assembly.

This plug pin gage is intended for production inspection in machining, fabrication, and assembly operations. It is used wherever a 0.175 inch nominal hole must be verified for minimum acceptable diameter. The minus designation means the gage is ground to the low side of the nominal diameter, functioning as the go member in a go/no-go gage pair or as a standalone minimum-size check. It is appropriate for light industrial and precision manufacturing environments.

Key Features

• Class ZZ tolerance class for production-grade dimensional inspection
• Minus designation grounds the gage to the low side of nominal for go-member applications
• 0.0002 inch tolerance ensures repeatable, accurate hole verification
• Steel construction provides durability under regular shop-floor use
• 0.175 inch diameter covers a common small-bore nominal size

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in go/no-go gage sets or as a standalone inspection tool for 0.175 inch nominal diameter holes in production machining and fabrication applications.

Installation Notes

Pin gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Before use, inspect the gage surface for nicks or burrs that could affect measurement accuracy. Store in a protective case away from other metal tooling to prevent surface damage. Periodic cleaning and light oiling will extend the service life of the gage.