Spi 19-258-3 Class Zz Minus Plug Pin Gage 0.258 in

Product Description

The SPI 19-258-3 is a Class ZZ minus plug pin gage with a nominal diameter of 0.258 inches, manufactured from steel. Plug pin gages are single-ended or double-ended cylindrical gauging tools used to verify bore and hole diameters to a known tolerance. This gage holds a minus tolerance of 0.0002 inches, placing it within the Class ZZ specification for general-purpose inspection work. Machinists, quality control technicians, and toolroom professionals use plug gages to confirm that drilled, reamed, or bored holes fall within print tolerance before parts advance to the next stage of production or assembly.

This gage is suited for shop-floor and inspection-room use in metal fabrication, machining, and manufacturing environments. It is appropriate for checking hole diameters in ferrous and non-ferrous workpieces where a Class ZZ tolerance level meets the inspection requirement. Class ZZ gages are commonly specified for production inspection of lower-precision fits where a go or no-go check is needed without the tighter tolerances required by Class X, Y, or Z gages.

Key Features

• Nominal diameter of 0.258 inches for direct bore verification
• Class ZZ minus tolerance of 0.0002 inches for general-purpose inspection
• Steel construction for wear resistance and dimensional stability
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Single-unit packaging suitable for individual toolroom or inspection station use

Compatibility

Designed as a standard Class ZZ minus plug pin gage for general-purpose inspection of 0.258-inch nominal diameter holes in machined and fabricated components.

Installation Notes

Plug pin gages are handled and used by machinists and quality control technicians following standard gauging practice. Clean the gage and the bore to be checked before use to prevent debris from affecting the reading. Do not force a plug gage into a hole; interference indicates the bore is undersize. Store the gage properly when not in use to protect the gauging surface from damage or corrosion that would affect accuracy.