Spi 29-154-2 Class Zz Plus Plug Gage 0.154 in

Product Description

The SPI 29-154-2 is a Class ZZ Plus plug gage designed for precision bore and hole measurement in machining, quality control, and inspection applications. It measures a nominal diameter of 0.154 inches with a tolerance of 0.0002 inches, making it suitable for verifying close-tolerance drilled, reamed, or bored holes. Constructed from steel, this gage provides the wear resistance and dimensional stability required for repeated use in production and inspection environments. Machinists, tool and die makers, and quality technicians use Class ZZ Plus plug gages as a reliable go/no-go or dimensional reference standard.

This plug gage is used in shop floor and inspection room settings where hole diameter verification is required. Typical applications include checking finished bores in machined components, verifying drill and reamer output, and confirming fit before assembly. The 0.154-inch diameter makes it appropriate for small-bore inspection tasks common in precision machining, toolmaking, and manufacturing quality assurance workflows.

Key Features

• Nominal measurement diameter of 0.154 inches for small-bore inspection
• Class ZZ Plus tolerance rating of 0.0002 inches for precise dimensional verification
• Steel construction for durability and dimensional stability under repeated use
• Compact, single-piece gage suitable for bench and floor inspection use
• Package quantity of 1 for individual replacement or toolbox stocking

Compatibility

Designed as an OEM-style replacement or standard plug gage for use in any inspection setup requiring a 0.154-inch diameter Class ZZ Plus go/no-go or dimensional reference standard.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians and do not require power or mechanical installation. Store the gage in a protective case or holder when not in use to prevent damage to the precision-ground surface. Clean the gage and the bore being measured before use to avoid measurement error caused by debris or oil film. Do not force the gage into an undersized hole, as this can damage the gage land and compromise accuracy.