Spi 19-022-3 Class Zz Minus Plug Pin Gage 0.022 in

Product Description

The SPI 19-022-3 is a Class ZZ minus plug pin gage machined from steel, designed for go/no-go dimensional inspection of small-diameter holes and bores. The 0.022-inch nominal diameter and minus tolerance grind of 0.000200 inches make this gage suitable for verifying tight-tolerance features in precision machined parts. Class ZZ is the standard commercial-grade designation for plug gages used in general inspection work rather than master or reference applications. Machinists, quality technicians, and tool-room personnel use this type of gage for production floor and incoming inspection tasks.

This pin gage is used in precision manufacturing environments where hole diameter verification is required on small-bore features. Typical applications include inspection of drilled, reamed, or punched holes in metal, plastic, and composite workpieces. The 0.022-inch size is common in fine-pitch fastener applications, electronics hardware, and instrument components. The minus tolerance grind ensures the gage sits at or below nominal, consistent with standard go-gage practice.

Key Features

• Class ZZ tolerance class for general commercial inspection use
• Minus tolerance grind at 0.000200 inches for consistent go-gage application
• 0.022-inch nominal diameter for small-bore inspection
• Steel construction for durability and dimensional stability
• Single-piece package quantity suitable for individual replacement or kit supplementing

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with conventional pin gage handles and holders accepting 0.022-inch diameter pins in general-purpose inspection setups.

Installation Notes

Pin gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils that can affect dimensional accuracy. Insert the pin gage into the feature being inspected with light, consistent hand pressure — never force the pin. Store pin gages in a protective case away from other metal tools to prevent surface damage. Calibration should be verified against a traceable standard at regular intervals per your facility quality plan.