Spi 29-084-1 Class Zz Plus Plug Gage 0.084 Inch

Product Description

The SPI 29-084-1 is a Class ZZ Plus plug gage used to verify the inside diameter of precision bores and holes to a nominal measurement of 0.084 inches. Built from steel, this go/no-go style gage gives machinists, quality technicians, and tool-room professionals a fast, reliable method for checking whether a drilled or reamed hole falls within tolerance. The Class ZZ Plus designation indicates a tighter tolerance grade than standard Class ZZ, with a tolerance of 0.0002 inches, making this gage appropriate for precision inspection work where dimensional accuracy is critical.

This plug gage is suited for use in machine shops, manufacturing facilities, and precision fabrication environments. It is commonly used during in-process inspection or final quality checks on parts with small-diameter bores. Ideal for use on hardened or ground steel components where hole diameter conformance must be confirmed before assembly or further machining operations.

Key Features

• Nominal measurement diameter of 0.084 inches for small-bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for precision go/no-go verification
• Steel construction for durability and wear resistance in shop environments
• Compact form factor suited to tight-access bore locations
• Single-piece package ready for immediate use on receipt

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for precision inspection applications requiring a 0.084 inch nominal bore diameter and Class ZZ Plus tolerance grade.

Installation Notes

Plug gages are handled by quality control technicians or machinists and require no permanent installation. Before use, clean the gage and the bore being inspected to remove chips, oil, or debris that could affect the reading. Store the gage in a protective case when not in use to prevent wear or corrosion on the gage surfaces. Do not force the gage into an undersized bore, as this can damage the gage or distort the workpiece.