Spi 29-231-8 Class Zz Plus Plug Gage 0.231 in Dia

Product Description

The SPI 29-231-8 is a Class ZZ Plus plug gage used to verify the inside diameter of holes to a nominal size of 0.231 inches. It is manufactured from steel and holds a tolerance of 0.0002 inches, making it suitable for inspection and quality control tasks where dimensional accuracy is critical. Machinists, toolmakers, and quality technicians use plug gages to confirm that drilled, reamed, or bored holes fall within the specified acceptance limits. The Class ZZ designation indicates a commercial-grade tolerance class appropriate for production gauging and incoming inspection work.

This plug gage is used in manufacturing and machine shop environments where hole diameter verification is part of a standard inspection process. It is suited to light production inspection, tool room applications, and incoming parts verification. The 0.231-inch nominal diameter makes it a common size for checking clearance holes, threaded hole preparations, and precision-bored features in metal components. It weighs 0.2 pounds and is sold individually.

Key Features

• Nominal measurement diameter of 0.231 inches for precise hole verification
• Class ZZ Plus tolerance class rated at 0.0002 inches for production-grade inspection
• Steel construction for durability and dimensional stability
• Compact and lightweight at 0.2 pounds for easy bench or in-line use
• Single-piece package ready for immediate use upon receipt

Compatibility

Designed as a standard go/no-go style plug gage for inspection of holes with a nominal inside diameter of 0.231 inches in general machining and manufacturing applications.

Installation Notes

Plug gages are used by quality technicians and machinists and require no permanent installation. Before use, clean both the gage and the workpiece bore thoroughly to remove chips, oil, and debris that could cause false readings. Store the gage in a protective case away from abrasive materials to preserve its calibrated tolerance. Periodic recalibration against a reference standard is recommended to maintain measurement traceability.