Spi 29-623-6 Class Zz Plus Plug Gage 0.623 Inch

Product Description

The SPI 29-623-6 is a Class ZZ Plus plug gage designed to verify the dimensional accuracy of bored or drilled holes with a nominal diameter of 0.623 inches. Manufactured from steel, this go/no-go style inspection tool holds a tolerance of 0.0002 inches, meeting Class ZZ Plus requirements for general-purpose inspection work. Machinists, toolmakers, and quality control technicians use plug gages like this to quickly confirm whether a feature falls within specification without the need for calipers or bore micrometers. The hardened steel construction resists wear under repeated use in production and shop-floor inspection environments.

This plug gage is suited for use in machine shops, manufacturing facilities, and maintenance environments where hole-size verification is part of standard quality control procedure. It is appropriate for inspecting holes in metal, plastic, or composite workpieces where a 0.623-inch nominal diameter is the target dimension. The gage is handled directly by the inspector and requires no power source or calibration equipment beyond standard gage block traceability practices.

Key Features

• 0.623-inch nominal measurement diameter for precise hole inspection
• Class ZZ Plus tolerance of 0.0002 inches for general-purpose go/no-go gauging
• Steel construction for durability and resistance to wear during repeated use
• Compact, single-piece design requires no setup or tooling
• Compatible with standard gage handle systems used in shop-floor inspection

Compatibility

Designed as a general-purpose Class ZZ Plus plug gage for verifying 0.623-inch diameter holes in production inspection and quality control applications.

Installation Notes

Plug gages are handled and used by machinists or quality technicians and do not require power or mechanical installation. Keep the gage clean and lightly oiled when not in use to prevent corrosion. Do not force the gage into an undersized hole, as this can damage the gage surface and compromise measurement accuracy. Periodic recalibration against a traceable standard is recommended to maintain inspection integrity.