Spi 29-669-9 Class Zz Plus Plug Gage 0.669 in

Product Description

The SPI 29-669-9 is a Class ZZ Plus plug gage designed to verify hole diameters of 0.669 inches with a tolerance of 0.0002 inches. Built from steel, it delivers the dimensional accuracy required for precision inspection work in machine shops, manufacturing facilities, and quality control environments. Class ZZ Plus gages meet the tighter end of the ZZ tolerance range, making them suitable for applications where consistent, repeatable go/no-go measurement is critical. Machinists, quality technicians, and tool-and-die professionals use this type of gage as a fast, reliable method to confirm bore size compliance without requiring CMM equipment.

This plug gage is used in inspection of drilled, reamed, or bored holes where dimensional accuracy must be verified against a print tolerance. Typical applications include production floor inspection, incoming part verification, and tooling qualification. The steel construction holds up to repeated use in shop environments. It is suited for both job shop and production settings where hole diameter conformance is checked frequently against a nominal 0.669-inch specification.

Key Features

• Class ZZ Plus tolerance class for high-accuracy go/no-go hole inspection
• Nominal measurement diameter of 0.669 inches
• Tolerance of 0.0002 inches for precise dimensional verification
• Steel construction for durability and wear resistance in shop use
• Compact and lightweight at 0.2 pounds for easy handling at the inspection station

Compatibility

Designed as a standard Class ZZ Plus plug gage for go/no-go inspection of 0.669-inch nominal diameter holes in machined components. Compatible with standard gage handle sets that accept the appropriate gage member size.

Installation Notes

Plug gages are handled and used by quality technicians and machinists performing dimensional inspection. Clean the gage and bore before use to remove chips, coolant, or debris that could affect the reading. Do not force the gage into an undersized hole, as this can damage the gage member and compromise calibration. Store the gage in its protective case when not in use to prevent wear and corrosion.