Spi 19-669-1 Class Zz Minus Plug Pin Gage 0.669 in

Product Description

The SPI 19-669-1 is a Class ZZ minus plug pin gage used to verify hole diameters in precision machining, fabrication, and inspection applications. Ground to a nominal diameter of 0.669 inches with a minus tolerance of 0.0002 inches, this gage provides a reliable no-go or go reference for quality control checks. The steel construction delivers the hardness and dimensional stability required for repeated use in shop-floor and inspection-room environments. Machinists, tool and die makers, and QC inspectors use plug gages like this to confirm that drilled, reamed, or bored holes fall within specified tolerances before parts advance to the next stage of production.

This Class ZZ minus plug pin gage is suited for general-purpose inspection of hole sizes in manufacturing and fabrication settings. Class ZZ is the standard commercial tolerance class for plug gages, making this an appropriate choice for production inspection where high-precision master-grade gages are not required. It is used across metalworking, industrial maintenance, and light manufacturing operations wherever hole diameter verification is part of the quality process.

Key Features

• Nominal diameter of 0.669 inches for direct hole-size verification
• Class ZZ minus tolerance of 0.0002 inches for consistent, repeatable inspection results
• Steel construction provides durability and dimensional stability under normal shop conditions
• Single-piece design suitable for use as a go or no-go gage depending on inspection setup
• Compact and lightweight at 0.2 pounds for easy handling during inspection

Compatibility

Designed as a general-purpose Class ZZ plug pin gage for use in standard hole-inspection applications where a 0.669-inch nominal diameter reference is required.

Installation Notes

Plug pin gages are handled and used by machinists, QC inspectors, and metrology technicians. Clean the gage and the test hole thoroughly before use to prevent debris from affecting readings. Apply light gage oil when storing to protect the steel surface from corrosion. Do not force the gage into a hole that resists entry, as this can cause wear or damage to the gage surface and compromise accuracy.