Spi 19-248-4 Class Zz Minus Plug Pin Gage 0.248 in

Product Description

The SPI 19-248-4 is a Class ZZ minus plug pin gage used to verify bore and hole diameters in precision machining and inspection work. It measures 0.248 inches in diameter and is manufactured from steel for durability and dimensional stability. The minus tolerance configuration means the gage is made undersized relative to the nominal diameter, confirming that a hole meets its minimum acceptable size. This tool is used by machinists, quality control technicians, and tool-and-die professionals performing go/no-go inspection on drilled, reamed, or bored features.

Class ZZ pin gages are suited for general-purpose inspection where production-grade accuracy is required but Class Z or ZZ-plus tolerances are not specified. The 19-248-4 is appropriate for inspection stations, machine shops, and manufacturing environments where hole size verification is part of a standard quality process. Its compact, single-pin format allows quick manual insertion checks on workpieces across a range of materials and production volumes.

Key Features

• Class ZZ minus tolerance classification for general-purpose go/no-go inspection
• 0.248 inch nominal diameter for precise bore verification
• Tolerance of 0.000200 inches for consistent measurement accuracy
• Steel construction for wear resistance and long service life
• Single-pin format enables fast, manual insertion checks

Compatibility

Designed as a general-purpose plug pin gage for use in standard go/no-go inspection applications where a 0.248 inch diameter Class ZZ minus gage is specified.

Installation Notes

Pin gages are handled by quality control technicians and machinists and require no power tools or fasteners for use. Clean the gage and the bore being checked before each measurement to prevent contamination from affecting results. Store the gage in a protective case away from moisture and extreme temperatures to maintain dimensional integrity. Do not force the gage into undersized holes, as this can damage the gage surface and compromise calibration.