Spi 29-319-1 Class Zz Plus Plug Gage 0.319 in Steel

Product Description

The SPI 29-319-1 is a Class ZZ Plus plug gage used to verify inside diameter tolerances in precision machining and inspection work. It measures a nominal diameter of 0.319 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection of bored holes, drilled passages, and machined features where tight dimensional control is required. Constructed from steel, this gage is built to withstand repeated use in shop-floor and quality-control environments. Machinists, toolmakers, and quality inspectors rely on this type of gage to confirm that a finished bore falls within acceptable dimensional limits before parts move to the next stage of production.

This plug gage is appropriate for use in manufacturing, machine shops, and precision fabrication settings where inside diameter verification is part of standard inspection protocol. It suits applications involving close-tolerance holes in metal components and is well suited to both incoming material inspection and in-process quality checks. The compact size and straightforward design allow it to be used at the machine or at a dedicated inspection station.

Key Features

• Class ZZ Plus tolerance grade for standard inspection and go/no-go diameter verification
• 0.319 inches nominal measurement diameter
• 0.0002 inches tolerance for precise dimensional control
• Steel construction for durability and wear resistance in shop environments
• Compact and lightweight at 0.2 pounds for easy handling during inspection

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for inside diameter inspection of 0.319-inch nominal bores in standard machining and quality-control applications.

Installation Notes

Plug gages are used by machinists and quality inspectors and do not require power or mechanical installation. Handle with clean, dry hands or inspection gloves to avoid surface contamination that could affect measurement accuracy. Store in a protective case away from extreme temperature changes to maintain dimensional stability. Follow your facility's gage calibration schedule and handle with care to avoid dropping, which can alter the gage surface and compromise accuracy.