Spi 29-480-1 Class Zz Plus Plug Gage 0.48 Inch

Product Description

The SPI 29-480-1 is a Class ZZ Plus plug gage designed to verify the inside diameter of bored, drilled, or reamed holes to a precise 0.48-inch nominal measurement. It holds a tolerance of 0.0002 inches, making it appropriate for inspection and quality-control work where close-tolerance hole sizing must be confirmed. Constructed from steel, the gage provides the dimensional stability and wear resistance expected in a production or job-shop environment. Machinists, tool-and-die technicians, and quality inspectors use plug gages like this one as a fast, reliable go/no-go reference during part verification.

This gage is suited for applications in precision machining, manufacturing inspection, and mechanical assembly where a 0.48-inch diameter hole must meet a defined tolerance. It is appropriate for use on ferrous and non-ferrous workpieces across both light production and one-off inspection scenarios. The compact form factor and steel construction make it practical for use at a machine or inspection bench.

Key Features

• Class ZZ Plus tolerance grade for inside-diameter inspection at 0.48 inches nominal
• 0.0002-inch tolerance for precise go/no-go hole verification
• Steel construction for dimensional stability and long service life
• Single-piece design suited for bench or floor inspection use
• Lightweight at 0.2 pounds for easy one-hand handling

Compatibility

Designed as an OEM-style Class ZZ Plus plug gage for inspection of 0.48-inch nominal inside diameters in standard machining and quality-control applications.

Installation Notes

Plug gages are handled and used by machinists and quality-control technicians following standard metrology practices. Ensure the workpiece hole is clean and free of burrs, chips, and coolant before gauging to avoid false readings or gage wear. Store the gage in a protective case away from other tooling to prevent surface damage. Calibration against a reference standard should be performed periodically in accordance with your facility quality plan.