Spi 19-512-3 Class Zz Minus Plug Pin Gage 0.512 in

Product Description

The SPI 19-512-3 is a Class ZZ minus plug pin gage designed for dimensional inspection of holes, bores, and machined features. Built from steel, this go/no-go style gage checks that a hole falls within a specified tolerance by verifying the minimum acceptable diameter. The 0.512-inch nominal diameter is held to a minus tolerance of 0.0002 inches, meeting Class ZZ specifications for general-purpose inspection work. Machinists, quality control technicians, and tool room personnel use plug gages like this one to verify part conformance quickly without complex measurement setups.

This plug pin gage is suited for use in manufacturing, machine shops, and quality inspection environments where precise hole sizing must be confirmed. It is appropriate for checking drilled, reamed, or bored holes in metal, plastic, or composite workpieces. Class ZZ tolerance gages are widely used in production inspection where general-purpose accuracy is required rather than master-grade precision. The 0.512-inch size fits a range of common fastener and bore applications encountered in general machining and fabrication work.

Key Features

• Class ZZ minus tolerance for general-purpose go/no-go hole inspection
• 0.512-inch nominal diameter for precise bore verification
• Tolerance of 0.0002 inches ensuring repeatable dimensional checks
• Steel construction for durability and wear resistance in shop use
• Compact single-piece gage suitable for handheld inspection

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for dimensional inspection of 0.512-inch nominal diameter holes and bores in standard machining and quality control applications.

Installation Notes

Plug pin gages are used by machinists and QC technicians and require no installation tools. Before use, clean the gage and the hole being inspected to remove chips, coolant, or debris that could affect accuracy. Do not force the gage into an undersized hole, as this can damage the gage surface and affect calibration. Store the gage in its protective case when not in use to prevent wear and corrosion.