Spi 29-866-1 Class Zz Plus Plug Gage 0.866 in Dia

Product Description

The SPI 29-866-1 is a Class ZZ Plus plug gage designed to verify the inside diameter of bores, holes, and machined features to a nominal size of 0.866 inches. Built to Class ZZ Plus tolerances, this gage holds a dimensional tolerance of 0.0002 inches, making it suitable for production inspection and quality control applications where consistent go/no-go verification is required. The gage is constructed from steel for durability and dimensional stability through repeated use. It is used by machinists, quality technicians, and tooling professionals in manufacturing and machining environments.

This plug gage is applied in production floor and inspection room settings where inside diameter conformance must be confirmed quickly and reliably. It is appropriate for checking drilled, reamed, or bored holes in metal and similar materials. The 0.866-inch nominal diameter makes it a common fit for a range of standard bore sizes encountered in general machining, automotive, and industrial fabrication work. It is a single-piece gage intended for one-piece-per-inspection use in go/no-go measurement setups.

Key Features

• Nominal measurement diameter of 0.866 inches for precise bore verification
• Class ZZ Plus tolerance of 0.0002 inches for reliable production inspection
• Steel construction for wear resistance and long service life
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Go/no-go style plug gage for fast pass-fail inspection decisions

Compatibility

Designed as an OEM-style replacement or standard addition to plug gage sets used for inside diameter inspection of 0.866-inch nominal bores in production and quality control applications.

Installation Notes

Plug gages are handled and applied by quality technicians or machinists familiar with dimensional inspection practices. Before use, ensure the bore and gage are clean and free of debris, chips, or cutting fluid that could affect measurement accuracy. Do not force the gage into the bore, as this can damage the gage or the part being inspected. Store the gage in a protective case and calibrate or verify against a reference standard periodically to maintain traceability.