Spi 19-431-6 Class Zz Minus Plug Pin Gage 0.431 in

Product Description

The SPI 19-431-6 is a Class ZZ minus plug pin gage machined from steel and used to verify bore and hole dimensions to a tolerance of 0.0002 inches. Class ZZ gages are the standard go/no-go reference tools for general-purpose inspection work in production and maintenance environments. This gage checks a nominal diameter of 0.431 inches and is designed for use by machinists, quality control technicians, toolmakers, and maintenance trades who need reliable, repeatable dimensional verification without the cost of higher-class laboratory gages.

Plug pin gages in the Class ZZ range are widely used on production floors, in fabrication shops, and in field maintenance settings where quick hole-size confirmation is needed. This minus gage is used as the go member in a go/no-go gage pair, confirming that a bore meets minimum acceptable size. Typical applications include checking drilled, reamed, or bored holes in metal, plastic, and composite workpieces across industrial, HVAC equipment manufacturing, and mechanical assembly operations.

Key Features

• Class ZZ tolerance class for general-purpose production inspection
• Minus designation for use as the go member in a go/no-go gage pair
• 0.431 inch nominal diameter for precise bore verification
• 0.0002 inch tolerance for consistent, repeatable measurement
• Steel construction for durability in shop and field environments

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage suitable for use with standard gage handle sets accepting 0.431 inch diameter pin gage blanks.

Installation Notes

Pin gages should be handled with clean, dry gloves or a lint-free cloth to prevent corrosion from skin oils. Store the gage in its protective case when not in use and keep it away from heat sources that could affect the steel. Periodically clean contact surfaces with a light instrument oil to maintain accuracy. Calibration should be verified against a traceable standard at intervals appropriate to the frequency of use and shop environment.