Spi 19-409-2 Class Zz Minus Plug Pin Gage 0.409 in

Product Description

The SPI 19-409-2 is a Class ZZ minus plug pin gage used to verify bore and hole diameters in precision machining and inspection work. It measures a nominal diameter of 0.409 inches with a minus tolerance of 0.0002 inches, confirming that a hole meets its lower acceptance limit. The gage is constructed from steel for durability and dimensional stability under shop conditions. Machinists, quality control technicians, and tool-and-die professionals use pin gages like this one as part of go/no-go inspection routines or as a standalone check tool during production runs.

This gage is suited for inspection of machined bores, drilled holes, punched openings, and reamed passages where tight dimensional control is required. Class ZZ gages are the working-grade standard for production inspection environments. The 0.409-inch diameter covers a common range used in light mechanical assemblies, jig and fixture work, and quality audits in both job-shop and production-floor settings.

Key Features

• Nominal diameter of 0.409 inches for precise hole verification
• Class ZZ minus tolerance of 0.0002 inches for production-grade inspection
• Steel construction for wear resistance and dimensional stability
• Single-piece design suitable for go/no-go and attribute inspection use
• Lightweight at 0.2 pounds for easy handling during inspection routines

Compatibility

Designed as a standard Class ZZ minus plug gage for use with any inspection setup, gage block set, or pin gage handle that accepts a 0.409-inch diameter pin in production or quality control environments.

Installation Notes

Pin gages should be handled with clean cotton or nitrile gloves to prevent corrosion from skin oils. Store the gage in its original case or a protective sleeve when not in use to avoid nicks or surface damage that would affect accuracy. Calibrate or verify against a traceable standard at regular intervals per your shop quality plan. No power source or special tooling is required for use.