Spi 19-522-2 Class Zz Minus Plug Pin Gage 0.522 in

Product Description

The SPI 19-522-2 is a Class ZZ minus plug pin gage with a nominal diameter of 0.522 inches and a tolerance of 0.0002 inches. It is used to verify hole sizes and bore diameters in precision machining and inspection applications. The gage is machined from steel for durability and dimensional stability. Class ZZ is a general-purpose tolerance class suited for production inspection where high-volume checking is performed. Machinists, quality control technicians, and tool and die professionals use this gage as part of go/no-go or attribute inspection routines.

This pin gage is suited for shop floor and inspection room use in manufacturing, fabrication, and machine shops. The minus designation indicates the gage is ground to the low side of the nominal diameter, following standard gage-maker conventions for plug gages. It is appropriate for checking drilled, reamed, or bored holes where dimensional conformance is required. The 0.522-inch size fits into common hole-checking applications across general metalworking and light industrial production environments.

Key Features

• Nominal diameter of 0.522 inches for precise hole inspection
• Class ZZ tolerance class rated for general production inspection use
• Minus designation ground to the low side of nominal per standard gage conventions
• Steel construction for wear resistance and dimensional stability
• Tolerance of 0.0002 inches for consistent measurement performance
• Lightweight at 0.2 pounds for easy single-hand operation

Compatibility

Designed as an OEM-style replacement or direct-use Class ZZ plug pin gage compatible with standard pin gage handle sets and holders that accept 0.522-inch diameter pins.

Installation Notes

Pin gages should be installed into a handle or holder by a qualified machinist or quality technician following the tool manufacturer's insertion guidelines. Clean the gage and the hole being checked before use to prevent debris from affecting measurement accuracy. Store pin gages in a protective case away from moisture to prevent corrosion and dimensional changes. Do not force a pin gage into an undersized hole, as this can damage the gage surface and compromise measurement integrity.