Spi 29-179-9 Class Zz Plus Plug Gage 0.179 in

Product Description

The SPI 29-179-9 is a Class ZZ Plus plug gage designed to verify hole diameters to a nominal size of 0.179 inches with a tolerance of 0.0002 inches. Plug gages are go/no-go inspection tools used to confirm that a drilled, reamed, or bored hole falls within an acceptable dimensional range. This gage is constructed from steel for wear resistance and dimensional stability. It is a standard hand tool used by machinists, quality control inspectors, and toolroom technicians during part inspection and process verification on the shop floor or in the inspection lab.

This plug gage is suited for small-diameter hole inspection in precision machining environments, including manufacturing, fabrication, and toolroom applications. The Class ZZ Plus designation indicates a commercial-grade tolerance class appropriate for general inspection of production parts where close dimensional control is required. Typical use cases include incoming inspection, in-process quality checks, and final part verification on components with 0.179-inch nominal hole features.

Key Features

• Nominal measurement diameter of 0.179 inches for precise small-hole inspection
• Class ZZ Plus tolerance class rated at 0.0002 inches for reliable go/no-go inspection
• Steel construction provides durability and dimensional stability under repeated use
• Compact, lightweight design at 0.2 pounds for easy single-hand operation
• Standard single-piece packaging suitable for individual toolroom or bench use

Compatibility

Designed as a standard Class ZZ Plus plug gage for general-purpose inspection of 0.179-inch nominal diameter holes in machined components across a wide range of manufacturing and toolroom applications.

Installation Notes

Plug gages are used by machinists and quality inspectors and do not require power or mechanical installation. Before use, clean the gage and the hole being inspected to remove chips, coolant, or debris that could affect the reading. Apply light, even hand pressure when inserting the gage — never force a plug gage, as this can damage the gage or the workpiece. Store the gage in its case or on a clean surface away from abrasive materials to preserve its calibrated tolerance.