Spi 29-661-6 Class Zz Plus Plug Gage 0.661 Inch

Product Description

The SPI 29-661-6 is a Class ZZ Plus plug gage designed for go/no-go hole inspection in precision machining and quality control applications. It measures bore diameters at a nominal 0.661 inches with a tolerance of 0.0002 inches, providing the close-tolerance verification required for tight-fit assemblies. Constructed from steel, this gage delivers the wear resistance and dimensional stability that production floors and inspection departments depend on. It is a single-piece instrument used by machinists, toolmakers, and QC inspectors to confirm that drilled, reamed, or bored holes fall within specification.

Class ZZ Plus plug gages are suited for general-purpose inspection of production workpieces where moderate accuracy requirements apply. This gage is appropriate for use in machine shops, manufacturing facilities, and maintenance environments where hole diameter verification is part of a standard inspection workflow. Its compact size and 0.2-pound weight make it easy to handle at the machine or at a dedicated inspection station.

Key Features

• Nominal measurement diameter of 0.661 inches for precise hole gauging
• Tolerance of 0.0002 inches meets Class ZZ Plus accuracy requirements
• Steel construction provides durability and dimensional stability under repeated use
• Lightweight at 0.2 pounds for easy single-hand operation
• Single-piece package quantity simplifies individual tool procurement

Compatibility

Designed as a standard Class ZZ Plus plug gage for go/no-go inspection of holes with a nominal diameter of 0.661 inches in general production and quality control environments.

Installation Notes

Plug gages require no installation, but proper use technique is essential for accurate results. Clean the gage and bore thoroughly before gauging to prevent debris from causing false readings or accelerated wear. Store the gage in its protective case when not in use to maintain surface finish and dimensional integrity. Periodic recalibration against a certified master is recommended to ensure ongoing measurement traceability.