Spi 29-447-0 Class Zz Plus Plug Gage 0.447 in Dia

Product Description

The SPI 29-447-0 is a Class ZZ Plus plug gage designed to verify the diameter of precision bores and holes. It measures a nominal diameter of 0.447 inches with a tolerance of 0.0002 inches, placing it in the ZZ Plus accuracy class used for general-purpose inspection work. Machined from steel for durability, this plug gage is a go/no-go style tool used by machinists, quality control technicians, and tool-and-die professionals to confirm that machined holes fall within specified dimensional limits.

This gage is suited for precision measurement tasks in machine shops, manufacturing facilities, and quality inspection departments. It is used when verifying hole diameters in production parts, fixtures, and assemblies where dimensional accuracy at the 0.447-inch nominal size must be confirmed. The compact, single-piece form factor makes it a standard bench-inspection tool for day-to-day hole verification.

Key Features

• Class ZZ Plus accuracy class suitable for general-purpose inspection and production gaging
• Nominal measurement diameter of 0.447 inches with 0.0002 inches tolerance
• Steel construction for resistance to wear during repeated use
• Lightweight at 0.2 pounds, easy to handle at the inspection bench
• Single-piece plug design for straightforward go/no-go hole verification

Compatibility

Designed as an OEM-style precision inspection tool for verifying 0.447-inch nominal bore diameters in general machining and quality control applications.

Installation Notes

Plug gages are handled and used by quality technicians and machinists during inspection, not installation. Clean both the gage and the bore before use to prevent false readings caused by debris or cutting fluid residue. Do not force the gage into an undersized hole, as this can damage the gage surface and compromise its accuracy. Store the gage in a protected case away from other metal tooling to prevent nicks and wear on the gaging surface.