Spi 19-853-1 Class Zz Minus Plug Pin Gage 0.853 in

Product Description

The SPI 19-853-1 is a Class ZZ minus plug pin gage machined to a 0.853-inch nominal diameter with a minus tolerance of 0.0002 inches. Plug pin gages are precision go/no-go inspection tools used to verify bore and hole diameters to tight dimensional standards. This gage is constructed from steel for durability and dimensional stability under repeated use. Dimensional inspection professionals, machinists, and quality-control technicians use Class ZZ gages for general-purpose production inspection where high-precision tolerance verification is required.

Class ZZ minus plug gages are suited to incoming inspection, in-process quality checks, and final inspection on production floors, tool rooms, and machine shops. The minus designation means the gage is ground to the lower boundary of the nominal diameter, allowing it to function as a go gage in standard application. This gage is appropriate for checking drilled, reamed, or bored holes in metalworking and fabrication environments.

Key Features

• 0.853-inch nominal diameter for precise bore verification
• Class ZZ classification for general-purpose production inspection
• Minus tolerance ground to 0.0002 inches for consistent go-gage performance
• Steel construction for dimensional stability and wear resistance
• Single-piece package suitable for individual replacement or kit supplementation

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for use with standard gage handle holders accepting 0.853-inch diameter pin gages in production inspection and quality-control applications.

Installation Notes

Plug pin gages are handled by dimensional inspection technicians and machinists following standard metrology practices. Store the gage in a protective case away from moisture and contaminants to preserve the ground surface. Clean contact surfaces before each use and apply a light instrument oil to prevent corrosion. Do not force the gage into a bore; apply only hand pressure to avoid damage to the gage or the workpiece.