Spi 29-135-1 Class Zz Plus Plug Gage 0.135 in Dia

Product Description

The SPI 29-135-1 is a Class ZZ Plus plug gage designed for precision hole diameter inspection. It measures a nominal bore diameter of 0.135 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go dimensional verification in quality control and machining workflows. Constructed from steel for durability and dimensional stability, this gage is a standard hand-tool used by machinists, toolmakers, and quality technicians to verify that drilled, reamed, or bored holes fall within specified tolerances.

This plug gage is used in production inspection environments, toolroom applications, and job shop settings where tight dimensional control is required. The Class ZZ Plus designation indicates a commercial-grade tolerance standard appropriate for checking work-part holes in general manufacturing. It is well suited for incoming inspection, in-process quality checks, and final part verification on small-diameter bores in the 0.135-inch range.

Key Features

• 0.135-inch nominal diameter for precise small-bore measurement
• 0.0002-inch tolerance meets Class ZZ Plus dimensional standards
• Steel construction provides wear resistance and long service life
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Single-piece package ready for immediate use upon receipt

Compatibility

Designed as a standard Class ZZ Plus plug gage for go/no-go inspection of 0.135-inch nominal diameter bores in machined components across general manufacturing and toolroom applications.

Installation Notes

Plug gages are handled and used by machinists and quality control personnel and do not require installation in the traditional sense. Store the gage in its protective case when not in use to prevent damage to the precision ground surfaces. Clean bore and gage surfaces before use to ensure accurate measurement readings. Avoid dropping or striking the gage, as impact can alter the ground diameter and invalidate measurements.