Spi 29-975-0 Class Zz Plus Plug Gage 0.975 in

Product Description

The SPI 29-975-0 is a Class ZZ Plus plug gage used to verify the inside diameter of machined bores and holes to a nominal size of 0.975 inches. It holds a tolerance of 0.0002 inches, making it a reliable go/no-go inspection tool for production and quality control environments. Constructed from steel, this gage is designed for repeated use on the shop floor without loss of dimensional accuracy. Machinists, quality technicians, and precision manufacturing professionals use this type of gage to confirm that finished bores fall within acceptable tolerance limits before parts move to the next stage of production.

This plug gage is suited for use in precision machining shops, tool rooms, and manufacturing facilities where bore diameter verification is part of standard inspection protocol. It applies to any application requiring confirmation of a 0.975-inch nominal bore, including hydraulic components, mechanical assemblies, and general metalworking. The compact size and steel construction make it practical for both bench inspection and in-process checks at the machine.

Key Features

• Nominal measurement diameter of 0.975 inches for precise bore verification
• Class ZZ Plus tolerance rating of 0.0002 inches for go/no-go inspection use
• Steel construction for durability and dimensional stability under repeated use
• Single-piece package quantity suited for individual technician or toolroom use
• Lightweight at 0.2 pounds for easy handling during inspection tasks

Compatibility

Designed as an OEM-style replacement or direct-use inspection gage for any application requiring a 0.975-inch Class ZZ Plus plug gage in standard steel construction.

Installation Notes

Plug gages are handled and used by quality technicians and machinists as inspection instruments, not installed components. Clean the gage and bore surfaces before use to prevent false readings from chips or coolant residue. Store the gage in its protective case when not in use to prevent wear or corrosion that could compromise tolerance accuracy. Do not force the gage into a bore; resistance indicates the bore is undersize and requires further machining.