Spi 29-123-7 Class Zz Plus Plug Gage 0.123 in Dia

Product Description

The SPI 29-123-7 is a Class ZZ Plus plug gage used to verify the inside diameter of drilled, reamed, or bored holes to a nominal size of 0.123 inches. Built from steel, this gage is engineered to a tolerance of 0.0002 inches, providing reliable go/no-go measurement in production and inspection environments. Class ZZ Plus gages are suited for general-purpose inspection where consistent dimensional control is required. Machinists, toolmakers, and quality control technicians use this type of gage to confirm bore dimensions during in-process checks and final inspection.

This plug gage is appropriate for use in machine shops, fabrication facilities, and manufacturing lines where small-diameter bore verification is part of standard quality assurance workflow. It fits inspection applications across industrial and trade settings wherever hole tolerances must be confirmed before assembly. The 0.123-inch nominal diameter makes it well suited for close-tolerance drilled or reamed holes in metal components.

Key Features

• Nominal measurement diameter of 0.123 inches for precise small-bore inspection
• Class ZZ Plus tolerance rating of 0.0002 inches for general-purpose dimensional verification
• Steel construction for durability in production and inspection use
• Compact and lightweight at 0.2 pounds for easy single-hand operation
• Single-piece package quantity allows individual purchase for targeted tooling needs

Compatibility

Designed as an OEM-style inspection gage for general-purpose go/no-go bore verification in applications requiring a 0.123-inch nominal hole diameter.

Installation Notes

Plug gages are handled and used by machinists, toolmakers, and quality inspectors rather than installed in a permanent sense. Clean the bore and gage surfaces before use to ensure accurate readings and prevent premature wear. Store the gage in a protective case away from chips, coolant, and temperature extremes to maintain calibration integrity. Periodically verify the gage against calibration standards in accordance with your facility quality program.