Spi 19-475-3 Class Zz Minus Plug Pin Gage 0.475 in

Product Description

The SPI 19-475-3 is a Class ZZ minus plug pin gage designed to check the minimum acceptable diameter of drilled, reamed, or bored holes in precision machining and quality control applications. The gage measures 0.475 inches in diameter with a tolerance of 0.0002 inches, conforming to Class ZZ specifications for go/no-go inspection work. Constructed from steel for durability and dimensional stability, it is a standard tool in manufacturing inspection, toolroom setups, and incoming part verification. Machinists, quality technicians, and toolroom specialists rely on this type of gage for fast, reliable hole-size confirmation without the need for electronic measurement equipment.

This plug pin gage is suited for inspection tasks in machine shops, production floors, and quality control departments. It is used wherever consistent hole-diameter verification is required, including checking tolerance compliance on machined components, fixtures, and assemblies. The minus designation means the gage is ground to the lower boundary of the specified diameter, making it appropriate for checking that a hole has not been undercut beyond the minimum allowable size. It is a single-ended gage intended for hand use in bench or floor inspection settings.

Key Features

• Class ZZ tolerance class for general-purpose go/no-go hole inspection
• Minus designation confirms hole minimum acceptable diameter
• 0.0002 inch tolerance for reliable dimensional verification
• Steel construction provides dimensional stability and wear resistance
• 0.475 inch nominal diameter for standard drilled and reamed hole sizes

Compatibility

Designed as a standard Class ZZ minus plug pin gage for general-purpose hole inspection in machining and quality control environments. No specific equipment compatibility is stated by the manufacturer for this part.

Installation Notes

Plug pin gages are hand tools used by machinists and quality technicians and require no installation. Store the gage in a clean, dry environment to prevent corrosion and maintain dimensional accuracy. Do not force the gage into a hole; apply light, steady hand pressure only. Clean the gage and the hole being inspected before use to avoid debris-related false readings.