Spi 19-879-6 Class Zz Minus Plug Pin Gage 0.879 in

Product Description

The SPI 19-879-6 is a Class ZZ minus plug pin gage used to verify bore diameters and hole tolerances in precision machining and inspection work. Built from steel, it measures a nominal diameter of 0.879 inches with a tolerance of 0.0002 inches, making it suited for go/no-go dimensional verification tasks on the shop floor or in a quality control environment. This type of single-end pin gage is a standard tool for machinists, toolmakers, and quality technicians who need a reliable, consistent reference for checking hole size conformance to print specifications.

Class ZZ plug gages are the most common grade used in production inspection where high-precision laboratory-grade gages are not required. The 19-879-6 fits typical applications in manufacturing, fabrication, and machine shop environments where verifying a 0.879-inch nominal bore is part of routine part acceptance. It is appropriate for use on machined components, castings, and fabricated assemblies requiring dimensional verification at this diameter.

Key Features

• Class ZZ minus tolerance designation for production-grade go/no-go inspection
• 0.879-inch nominal diameter for precise bore verification
• 0.0002-inch tolerance for consistent and repeatable measurement
• Steel construction for durability in shop-floor environments
• Single-piece design compatible with standard pin gage handle sets

Compatibility

Designed as an OEM-style replacement or direct-use pin gage for standard handle-style plug gage sets accepting 0.879-inch diameter pins in production and inspection applications.

Installation Notes

Pin gages should be handled with clean cotton gloves or lint-free cloths to prevent corrosion from skin oils. Store in a protective case away from temperature extremes to maintain dimensional stability. When using in a handle-style gage set, confirm the collet or chuck is clean and secure before gauging. Follow your facility quality procedures and applicable ASME B89 standards for gage calibration and use intervals.