Spi 29-124-5 Class Zz Plus Plug Gage 0.124 in Dia

Product Description

The SPI 29-124-5 is a Class ZZ Plus plug gage used to verify the inside diameter of machined holes and bores to a nominal measurement of 0.124 inches. Built from steel, it delivers a tolerance of 0.0002 inches, making it suitable for dimensional inspection tasks where close-tolerance verification is required. Machinists, quality control technicians, and tool room professionals use plug gages like this one to confirm that drilled, reamed, or broached holes fall within acceptable size limits before parts advance to assembly or final inspection.

This gage is appropriate for use in machine shops, manufacturing facilities, and job shops performing precision inspection of small-diameter holes. At 0.124 inches nominal diameter, it fits applications involving small bores common in light mechanical assemblies, instrumentation components, and precision-machined parts. Its compact size and straightforward go/no-go style operation make it a standard tool at inspection benches and in-process quality checkpoints.

Key Features

• Nominal diameter of 0.124 inches for small-bore inspection
• Class ZZ Plus tolerance rating of 0.0002 inches for close-tolerance verification
• Steel construction for durability and dimensional stability
• Single-piece gage design suited for bench inspection and in-process checks
• Lightweight at 0.2 pounds for easy handling at the inspection station

Compatibility

Designed as an OEM-style precision measurement tool for verifying 0.124-inch nominal diameter holes in steel, aluminum, and other machined workpieces across standard shop inspection applications.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians, not installed in the traditional sense. Store the gage in a protective case away from abrasive surfaces to prevent wear on the gaging surface. Clean the gage and the hole being checked before use to avoid false readings caused by chips or coolant residue. Do not force the gage into an undersized hole, as this can damage the gage surface and compromise measurement accuracy.