Spi 19-473-8 Class Zz Minus Plug Pin Gage 0.473 in

Product Description

The SPI 19-473-8 is a Class ZZ minus plug pin gage ground to a nominal diameter of 0.473 inches with a minus tolerance of 0.0002 inches. Pin gages in this class are used for go/no-go inspection of drilled, reamed, or punched holes to verify dimensional conformance during production or incoming inspection. The 19-473-8 is manufactured from steel, providing the hardness and wear resistance required for repeated insertion into bored or machined features. Machinists, quality technicians, and tool room professionals use Class ZZ gages as a cost-effective solution for general-purpose hole checking where higher gage-class tolerances are not required by the inspection plan.

Class ZZ plug gages are suited to general workshop and production floor inspection across a wide range of industries including metalworking, fabrication, and light manufacturing. This gage is appropriate for checking hole sizes in steel, aluminum, and plastic workpieces where moderate tolerance control is the objective. At 0.473 inches nominal diameter, it fits into applications requiring inspection of mid-range bore sizes typically produced by twist drill or reaming operations. Individual gage members like the 19-473-8 can be used standalone or integrated into a set for comprehensive size coverage.

Key Features

• 0.473 inches nominal diameter for direct go/no-go hole inspection
• Class ZZ minus tolerance of 0.0002 inches for general-purpose inspection use
• Steel construction provides hardness and durability for repeated use
• Compact individual gage member — sold as a single unit (package quantity of 1)
• Minus designation ensures the gage member falls below nominal for correct go-gage function

Compatibility

Designed as an OEM-style replacement or supplemental member for Class ZZ plug gage sets used in general-purpose hole inspection applications. No specific system or model compatibility data was provided in the product input.

Installation Notes

Pin gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils, and should be lightly oiled with instrument oil for storage. Before use, verify the gage and the workpiece bore are at or near the same ambient temperature to avoid thermal expansion error. Do not force a plug gage into a hole — apply only light hand pressure to avoid springing the gage or damaging the workpiece. Inspection procedures should follow applicable dimensional standards such as ASME B89.1.5 for gage calibration and care.