Spi 29-126-0 Class Zz Plus Plug Gage 0.126 in Dia

Product Description

The SPI 29-126-0 is a Class ZZ Plus plug gage designed for precision go/no-go inspection of drilled, reamed, or bored holes with a nominal diameter of 0.126 inches. Built to Class ZZ Plus tolerances of 0.0002 inches, this gage provides a reliable reference for confirming bore size conformance in production and quality-control environments. Constructed from steel for durability and dimensional stability, it is used by machinists, toolmakers, quality inspectors, and precision measurement technicians who require repeatable, traceable results on small-diameter features.

Class ZZ Plus plug gages are suited for inspection of holes in manufactured parts where dimensional accuracy is critical. This gage is appropriate for use in machine shops, fabrication facilities, and quality labs performing inspection on parts produced to close-tolerance drawings. The 0.126-inch diameter range covers common small-bore applications in precision machined components. It is intended for use as part of a standard inspection process and pairs with complementary ring gages or calibrated measuring equipment during full dimensional verification workflows.

Key Features

• Class ZZ Plus tolerance rating of 0.0002 inches for precision bore inspection
• 0.126-inch nominal diameter measurement range
• Steel construction for dimensional stability and resistance to wear
• Go/no-go style inspection tool for fast, reliable pass/fail determination
• Single-piece package quantity suitable for individual workstation use

Compatibility

Designed as an OEM-style inspection gage for verifying 0.126-inch nominal diameter bores in precision machined parts and assemblies requiring Class ZZ Plus tolerance conformance.

Installation Notes

Plug gages should be handled and stored carefully to prevent surface damage that could affect measurement accuracy. Before use, clean the gage and the bore being inspected to remove chips, coolant, or debris. Apply light gage oil when appropriate to reduce wear and protect the steel surface. Calibration and use should follow ASME B89 or applicable shop standards for dimensional inspection tools.