Spi 19-137-9 Class Zz Minus Plug Pin Gage 0.137 in

Product Description

The SPI 19-137-9 is a Class ZZ minus plug pin gage machined to a 0.137-inch nominal diameter with a minus tolerance of 0.0002 inches. Plug pin gages are single-ended or double-ended hardened steel gauging tools used to verify that a drilled, reamed, or punched hole meets a specified size requirement. The Class ZZ designation indicates this is a working-grade gage intended for production floor use rather than laboratory-grade inspection. Machinists, tool-and-die makers, and quality control technicians use plug gages to quickly confirm go/no-go hole acceptance on manufactured parts.

This gage is suited for production inspection environments where hole diameter verification is required on steel, aluminum, or plastic workpieces. The 0.137-inch diameter corresponds to common drill and reamed hole sizes found in light manufacturing, sheet metal fabrication, and precision assembly operations. The minus tolerance grind ensures the gage pin does not exceed nominal, which is the standard approach for go-gage members used in attribute inspection.

Key Features

• Class ZZ working-grade tolerance for production floor hole inspection
• Minus tolerance grind of 0.0002 inches holds the pin below nominal diameter
• 0.137-inch nominal diameter suits common drilled and reamed hole sizes
• Steel construction provides durability for repeated gauging cycles
• Compact, single-pin format for fast go/no-go attribute checks

Compatibility

Designed as a working-grade Class ZZ plug pin gage for use in standard attribute gauging applications where a 0.137-inch nominal hole diameter must be verified per drawing tolerance.

Installation Notes

Plug pin gages are handled and used by machinists and quality control personnel — no installation in the traditional sense applies. Clean the gage and the hole to be checked before use to prevent debris from causing false readings or scoring the gage surface. Store pin gages in a protective case away from other tooling to prevent nicking the gauging surface. Calibrate or verify gage accuracy periodically against a master reference in accordance with your facility quality plan.