Spi 19-103-1 Class Zz Minus Plug Pin Gage 0.103 in

Product Description

The SPI 19-103-1 is a Class ZZ minus plug pin gage with a 0.103-inch nominal diameter, designed for go/no-go dimensional inspection of drilled, reamed, and punched holes in production and quality-control environments. Built from steel, it holds a tolerance of 0.0002 inches, meeting Class ZZ standards for general-purpose inspection work. Machinists, quality technicians, and toolroom professionals use pin gages like this one to verify bore diameter quickly and accurately without relying on electronic measurement equipment. The minus designation means the gage is ground below nominal, confirming the minimum acceptable hole size.

This gage is suited for incoming inspection, in-process quality checks, and tooling verification on the shop floor or in the inspection lab. Its compact size and single-pin format make it easy to incorporate into standard gage pin sets or use as a standalone check gage. Applications include verifying hole size in metal, plastic, and composite workpieces across light manufacturing, aerospace sub-assembly, and precision machining operations.

Key Features

• Class ZZ minus designation for general-purpose go/no-go hole inspection
• 0.103-inch nominal diameter for precise bore verification
• 0.0002-inch tolerance for reliable dimensional conformance checks
• Steel construction for durability and resistance to wear during repeated use
• Compact single-pin format compatible with standard gage pin handle sets

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage suitable for use with standard gage pin handles and sets accepting 0.103-inch diameter pins.

Installation Notes

Pin gages should be handled and stored with care to prevent nicking or corrosion that would affect measurement accuracy. Clean the gage and the bore being checked before use, and apply a light coat of instrument oil after use to prevent rust. Do not force the pin into a hole; excessive force will damage the gage and yield false readings. Periodic recalibration against a traceable standard is recommended to confirm the gage remains within tolerance.