Spi 29-617-8 Class Zz Plus Plug Gage 0.617 in

Product Description

The SPI 29-617-8 is a Class ZZ Plus plug gage used to verify the internal diameter of machined holes to a nominal size of 0.617 inches. It provides a go/no-go style reference point for dimensional inspection in manufacturing, machine shop, and quality-control environments. Built from steel, this gage holds a tolerance of 0.0002 inches, making it appropriate for general-purpose inspection work where Class ZZ accuracy is specified. Machinists, quality technicians, and toolroom personnel use plug gages like this one to confirm bore dimensions meet print tolerances before parts move to the next production stage.

This gage is suited for use in job shops, production facilities, and inspection departments where hole diameter verification is a routine part of the workflow. It applies to any application requiring a 0.617-inch nominal bore check, including hydraulic components, bushings, bearing bores, and similar precision-machined features. Class ZZ is the standard tolerance class for general inspection use and is not intended for master or reference gage applications.

Key Features

• Nominal measurement diameter of 0.617 inches for precise bore inspection
• Class ZZ Plus tolerance grade at 0.0002 inches for general-purpose inspection
• Steel construction for durability in production and toolroom environments
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Single-piece packaging suitable for individual replacement or bench stock

Compatibility

Designed as a general-purpose Class ZZ plug gage for verifying 0.617-inch nominal bore diameters in standard inspection and quality-control applications.

Installation Notes

Plug gages are handled by machinists and quality technicians during in-process or final inspection. Clean both the gage and the bore being checked before use to prevent false readings caused by chips or debris. Do not force the gage into a hole; excessive insertion force can damage the gage or the workpiece and will produce inaccurate results. Store the gage in a protective case away from temperature extremes to maintain dimensional stability.