Spi 29-790-3 Class Zz Plus Plug Gage 0.79 in Dia

Product Description

The SPI 29-790-3 is a Class ZZ Plus plug gage used to verify hole diameters to a tolerance of 0.0002 inches. Built from steel, this fixed-limit gage provides a fast, reliable GO/NO-GO check for production and inspection environments. Class ZZ Plus gages are recognized for tighter tolerances than standard Class ZZ tools, making the 29-790-3 a practical choice when dimensional accuracy is critical. Machinists, quality technicians, and tool-room professionals use plug gages like this to confirm bore sizes without the variability of hand-held measuring instruments. The 0.79-inch nominal diameter covers a common bore size encountered in general machining and manufacturing work.

The 29-790-3 is suited for dimensional inspection of machined holes in production, job-shop, and quality-control settings. It is appropriate for both incoming inspection of purchased components and in-process verification on the shop floor. Typical applications include checking drilled, reamed, or bored holes in metal parts where the 0.79-inch nominal diameter falls within the required specification range. This gage is used by inspection departments and machinists working to tight tolerances in manufacturing environments.

Key Features

• Class ZZ Plus tolerance rating for tighter dimensional control than standard Class ZZ gages
• 0.79-inch nominal diameter for checking common bore sizes
• Tolerance of 0.0002 inches supports high-accuracy inspection requirements
• Steel construction for durability in shop and inspection environments
• Fixed-limit design enables fast GO/NO-GO verification without calculation

Compatibility

Designed as an OEM-style fixed-limit plug gage for use wherever a 0.79-inch nominal diameter Class ZZ Plus gage is required in standard inspection or production workflows.

Installation Notes

Plug gages are handled and used by quality technicians and machinists; no installation trade license is required, but proper gage-handling procedures should be followed to protect the precision ground surfaces. Clean the gage and the bore before use to prevent debris from affecting readings or causing wear. Store the gage in its case when not in use to prevent corrosion and surface damage. Do not force the gage into a hole that resists entry, as this can damage the gage or the workpiece.