Spi 19-634-5 Class Zz Minus Plug Pin Gage 0.634 in

Product Description

The SPI 19-634-5 is a Class ZZ minus plug pin gage machined from steel, designed to verify hole diameters in precision inspection and quality control applications. It checks whether a drilled, reamed, or bored hole falls within the lower acceptable tolerance boundary. With a nominal diameter of 0.634 inches and a tolerance of 0.0002 inches, this gage delivers the dimensional accuracy required for production floor and inspection room use. Machinists, tool and die makers, and quality control technicians rely on Class ZZ pin gages for go/no-go verification without the need for measuring instruments. The steel construction provides durability and resistance to wear under repeated use.

This pin gage is suited for use in manufacturing, machine shops, and fabrication environments where hole size verification is part of standard inspection protocol. It applies to metalworking, plastics, and general industrial applications where hole tolerances must be confirmed before assembly. The minus designation means the gage is ground to the lower limit of the nominal diameter, making it appropriate for go-side inspection of close-tolerance bores and holes.

Key Features

• Class ZZ tolerance class for general-purpose inspection use
• Minus designation ground to lower diameter limit for go-side verification
• 0.634 inch nominal diameter
• 0.0002 inch tolerance for reliable dimensional confirmation
• Steel construction for durability and resistance to wear

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with conventional pin gage handle sets and holders sized to accept 0.634 inch diameter pins in general industrial and machine shop inspection applications.

Installation Notes

Pin gages are handled and used by machinists, quality technicians, and inspection personnel. Clean the gage and the hole being checked before use to prevent debris from affecting the measurement. Store pin gages in a protective case or roll when not in use to avoid surface damage. Do not force the gage into an undersized hole, as this can damage the gage or alter its calibration.