Spi 29-904-0 Class Zz Plus Plug Gage 0.904 in

Product Description

The SPI 29-904-0 is a Class ZZ Plus plug gage designed to verify bore and hole diameters with precision in production and inspection environments. Built to a diameter of 0.904 inches with a tolerance of 0.0002 inches, this gage provides reliable go/no-go measurement confirmation for machined components. The steel construction delivers the durability needed for repeated use on the shop floor or in a quality control lab. Machinists, tool room technicians, and quality assurance inspectors use plug gages like this one to confirm that finished holes meet specification before parts move to assembly.

This plug gage is suited for dimensional inspection tasks in manufacturing, job shop, and quality lab settings. It is commonly used when verifying drilled, reamed, or bored holes in metal or plastic workpieces that require tight-tolerance confirmation. The 0.904-inch diameter targets a specific bore size that must be verified consistently across production runs. A single-unit package quantity makes this a practical choice for individual inspection stations or as a replacement for a worn gage in an existing set.

Key Features

• 0.904-inch measurement diameter for precise bore verification
• Class ZZ Plus tolerance rating at 0.0002 inches for production-grade 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 direct replacement or individual station use

Compatibility

Designed as a standard Class ZZ Plus plug gage for use in any inspection or quality control application requiring 0.904-inch bore diameter verification.

Installation Notes

Plug gages are handled and used by machinists, quality technicians, and tool room personnel — no installation in the traditional sense is required. Store the gage in a protective case away from contaminants and temperature extremes to preserve calibration. Clean the gage and the bore surface before use to prevent false readings caused by chips or debris. Periodically inspect the gage for wear and recalibrate or replace it according to your facility measurement system assurance program.