Spi 19-476-1 Class Zz Minus Plug Pin Gage 0.476 in

Product Description

The SPI 19-476-1 is a Class ZZ minus plug pin gage with a 0.476-inch nominal diameter, designed for go/no-go inspection of drilled, reamed, or bored holes in production and quality-control environments. Built from steel, it delivers a tolerance of 0.0002 inches in the minus direction, meaning the gage is made slightly below the nominal size to function as a go-type check. Machinists, tool-and-die makers, and quality technicians use pin gages like this one to verify hole size conformance on the shop floor or in an inspection lab.

This gage is suited for dimensional inspection tasks in manufacturing, fabrication, and precision machining operations. It applies wherever hole diameter verification is required, including aerospace, automotive, and general metalworking environments. The 0.476-inch size targets holes in that nominal range, and its Class ZZ designation places it in the general-purpose inspection tier, appropriate for production-level checking rather than laboratory-grade master gaging.

Key Features

• Class ZZ tolerance class — suitable for production go/no-go hole inspection
• Minus designation — gage manufactured below nominal for go-type fit checking
• 0.0002-inch tolerance for reliable, repeatable measurement
• Steel construction provides durability in shop-floor conditions
• Compact and lightweight at 0.2 pounds for easy single-hand use

Compatibility

Designed as an OEM-style replacement and standard inspection tool for use in any application requiring a 0.476-inch nominal diameter Class ZZ minus plug pin gage.

Installation Notes

Pin gages are handled and stored by quality technicians and machinists — no power tools or utility shutoffs are required for use. Keep the gage clean and lightly oiled to prevent corrosion, and store it in its protective case when not in use. Do not force the gage into a hole that resists entry, as this can damage the gage or the workpiece. Calibration should be verified periodically against traceable standards per your facility quality plan.