Spi 19-188-2 Class Zz Minus Plug Pin Gage 0.188 in

Product Description

The SPI 19-188-2 is a Class ZZ minus plug pin gage with a 0.188-inch diameter, designed for go/no-go dimensional inspection of bored holes, drilled passages, and machined features in production and toolroom environments. Manufactured from steel, this pin gage holds a tolerance of 0.0002 inches, placing it within the Class ZZ specification for working-grade gages used in general inspection applications. Technicians and quality control personnel use this gage to verify that a feature is at or above its minimum acceptable size, making it a standard tool in machining shops and maintenance facilities.

This gage is suited for use in manufacturing, fabrication, and maintenance inspection settings where accurate bore and hole verification is required. It is appropriate for checking clearance holes, pilot holes, and other cylindrical features in both metals and engineered plastics. The minus designation means the gage is ground to the lower boundary of the nominal size, consistent with standard plug gage practice for go-type applications. It is typically used by machinists, toolroom technicians, and quality inspectors working to drawing tolerances.

Key Features

• Class ZZ working-grade tolerance for general production inspection
• 0.188-inch nominal diameter for precise bore and hole verification
• Minus designation ground to the lower tolerance boundary
• Steel construction for durability in shop environments
• 0.0002-inch tolerance for repeatable, accurate measurement

Compatibility

Designed as a working-grade Class ZZ minus plug pin gage for use with standard go/no-go gage handle sets accepting 0.188-inch diameter pin gages.

Installation Notes

Pin gages are handled by quality technicians and machinists and require no permanent installation. Before use, clean the gage and the feature being measured to remove chips, coolant, and debris that could affect reading accuracy. Store pin gages in a protective case away from other tools to prevent surface damage. Handle with care to avoid dropping, as impact can alter the ground diameter and invalidate the gage.