Spi 19-198-1 Class Zz Minus Plug Pin Gage 0.198 in

Product Description

The SPI 19-198-1 is a Class ZZ minus plug pin gage designed for go/no-go dimensional inspection of bored holes, drilled passages, and machined features requiring precise diameter verification. With a nominal diameter of 0.198 inches and a tolerance of 0.0002 inches, this gage gives quality-control technicians and machinists a reliable, repeatable reference for checking hole conformance to print. Constructed from steel for durability and dimensional stability, it is suited for shop-floor use in manufacturing, tooling, and inspection environments. This is a minus-type gage, meaning the gage pin diameter is ground to the minus side of the nominal size.

Class ZZ plug pin gages are the standard working-gage classification used in general manufacturing and production inspection. The 19-198-1 is appropriate for incoming material inspection, in-process quality checks, and final inspection of parts where a 0.198-inch hole diameter must be confirmed. Typical users include machinists, CNC operators, quality engineers, and tool room technicians working in metal fabrication, automotive, aerospace, and general industrial settings.

Key Features

• Nominal diameter of 0.198 inches for direct hole-size verification
• Class ZZ tolerance classification for general-purpose working gage applications
• Minus designation indicates gage is ground to the minus side of nominal diameter
• Tolerance of 0.0002 inches for consistent, repeatable inspection results
• Steel construction provides durability and dimensional stability in shop environments

Compatibility

Designed as a general-purpose plug pin gage for use with standard gage handle sets and pin gage holders compatible with 0.198-inch diameter gage pins. Verify handle range compatibility before use.

Installation Notes

Pin gages should be handled with clean cotton or nitrile gloves to prevent oil and debris transfer that can affect measurement accuracy. Store gages in a protective case away from other metal tooling to avoid nicks or burrs on the gage surface. Verify the gage and workpiece are at the same temperature before performing inspection, as thermal expansion can affect readings. Periodic calibration against a traceable standard is recommended to maintain measurement integrity.