Spi 29-239-1 Class Zz Plus Plug Gage 0.239 in Steel

Product Description

The SPI 29-239-1 is a Class ZZ Plus plug gage used to verify bore diameters to a nominal size of 0.239 inches with a tolerance of 0.0002 inches. Constructed from steel, this go/no-go style gage provides a reliable pass-fail check for machinists, quality control technicians, and precision measurement professionals. Class ZZ tolerances are recognized for general-purpose inspection work where close dimensional control is required. The compact, lightweight design at 0.2 pounds makes it easy to handle during repetitive inspection tasks on the shop floor or in a metrology environment.

This plug gage is suited for use in manufacturing, fabrication, and quality assurance applications where bore diameter verification is part of standard inspection protocol. It is appropriate for use on drilled, reamed, or bored holes in metal, plastic, or composite workpieces. Typical users include machinists, QC inspectors, and toolroom professionals working to tight dimensional tolerances in production or job-shop environments.

Key Features

• Nominal measurement diameter of 0.239 inches for precise bore inspection
• Class ZZ Plus tolerance rating of 0.0002 inches for general-purpose gauging
• Steel construction for durability and wear resistance in production environments
• Lightweight at 0.2 pounds for comfortable single-hand use
• Go/no-go design enables fast pass-fail inspection without interpretation

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for any application requiring inspection of 0.239-inch nominal bore diameters to Class ZZ Plus tolerance standards.

Installation Notes

Plug gages should be handled by metrology or quality control personnel following standard gauging practices. Clean the gage and workpiece bore before use to remove chips, coolant, or debris that could affect measurement accuracy. Do not force the gage into an undersized bore, as this can damage the gage land and compromise tolerance integrity. Store in a protective case away from moisture and temperature extremes to maintain calibration.