Spi 29-814-1 Class Zz Plus Plug Gage 0.814 in Dia

Product Description

The SPI 29-814-1 is a Class ZZ Plus plug gage used to verify the inside diameter of bored, reamed, or drilled holes to a nominal measurement of 0.814 inches. It is manufactured from steel and carries a tolerance of 0.0002 inches (0.0051 mm), consistent with Class ZZ Plus standards for go/no-go inspection work. Machinists, quality control technicians, and precision toolroom personnel use this gage to confirm dimensional conformance on production and inspection floors. Each unit ships individually and is suitable for single-piece or low-volume inspection tasks where a dedicated fixed-limit gage is required.

This plug gage is used in manufacturing and machining environments where hole diameter acceptance or rejection must be established quickly and repeatably. Typical applications include incoming inspection, in-process quality checks, and final part verification on components with 0.814-inch diameter bore requirements. It is appropriate for use in both job-shop and production settings where fixed-limit gaging is preferred over adjustable or indicating instruments.

Key Features

• Nominal measurement diameter of 0.814 inches for direct hole acceptance verification
• Class ZZ Plus tolerance of 0.0002 inches provides reliable fixed-limit gaging accuracy
• Steel construction for durability in shop-floor inspection environments
• Single-piece packaging supports individual toolroom and inspection station use
• Go/no-go style inspection eliminates need for indicating instruments in conformance checks

Compatibility

Designed as an OEM-style fixed-limit gage for any application requiring inspection of a 0.814-inch nominal inside diameter bore, consistent with Class ZZ Plus dimensional standards.

Installation Notes

Plug gages are handled and used by quality control technicians and machinists; no installation in the traditional sense is required. Keep the gage clean and lightly oiled when not in use to prevent corrosion and wear on the gaging surface. Do not force the gage into an undersized bore, as this will damage the gage and may produce false readings. Store in a protective case away from temperature extremes to maintain dimensional stability.