Spi 19-658-4 Class Zz Minus Plug Pin Gage 0.658 in

Product Description

The SPI 19-658-4 is a Class ZZ minus plug pin gage machined from steel for use in dimensional inspection and quality control applications. Designed to verify hole sizes and bore diameters, this pin gage checks whether a feature meets its specified lower-limit tolerance. At 0.658 inches in diameter with a tolerance of 0.000200 inches, it provides the accuracy needed for go/no-go inspection routines in production and maintenance environments. Machinists, quality technicians, and tool-and-die professionals rely on Class ZZ pin gages as an economical standard for general-purpose hole checking.

This pin gage is suited for use in manufacturing facilities, machine shops, and maintenance departments where frequent hole inspection is required. It applies to ferrous and non-ferrous workpieces where bore size verification is part of an inspection process. The minus designation means the gage is ground to the lower boundary of the nominal diameter, making it appropriate for checking minimum acceptable hole size in standard go/no-go gage setups. Single-pin packaging makes it straightforward to replace or supplement an existing gage set.

Key Features

• Class ZZ tolerance class for general-purpose dimensional inspection
• Minus designation ground to the lower boundary of the nominal diameter
• 0.000200 inch tolerance for reliable go/no-go measurement
• Steel construction for durability in shop environments
• 0.658 inch nominal diameter for precise bore verification

Compatibility

Designed as a standard Class ZZ minus plug pin gage suitable for use with conventional pin gage handles and gage blocks in general-purpose hole inspection applications.

Installation Notes

Pin gages are handled and used by quality technicians and machinists following standard metrology practices. Clean the gage and the workpiece bore before use to prevent debris from affecting measurement accuracy. Store pin gages in a protective case away from other tools to avoid surface damage that could compromise tolerance accuracy. Do not force a pin gage into a bore; light hand pressure is the correct technique for go/no-go checks.