Spi 29-637-6 Class Zz Plus Plug Gage 0.637 in

Product Description

The SPI 29-637-6 is a Class ZZ Plus plug gage designed to verify the dimensional accuracy of bored, drilled, or reamed holes with a nominal diameter of 0.637 inches. Built to Class ZZ Plus tolerance standards, this gage holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work in production and maintenance environments. The body is steel construction for durability under repeated use. Machinists, tool-and-die technicians, and quality control personnel use this gage to confirm hole size conformance to print specifications without the need for calipers or bore micrometers at the point of inspection.

The SPI 29-637-6 is used in machine shops, manufacturing facilities, and maintenance operations where hole diameter verification is part of a standard inspection process. It is appropriate for checking drilled or reamed through-holes and blind holes in metal, plastic, or composite workpieces. This gage is a hand-held, single-size instrument intended for use at 0.637 inches nominal diameter and is suited to both bench inspection and in-process floor checks.

Key Features

• Class ZZ Plus tolerance rating at 0.0002 inches for precise go/no-go inspection
• Nominal measurement diameter of 0.637 inches
• Steel construction for wear resistance and long service life
• Single-piece plug gage format for fast, repeatable hole checks
• Compact form factor supports both bench and in-process inspection use

Compatibility

Designed as a standard Class ZZ Plus plug gage for inspecting holes with a 0.637-inch nominal diameter in general manufacturing and maintenance inspection applications.

Installation Notes

Plug gages are handled and used by machinists or quality control technicians and require no installation. Clean the gage and the hole to be checked before use to prevent debris from affecting the reading. Do not force the gage into an undersized hole, as this can damage the gage land and compromise accuracy. Periodic calibration against a certified master is recommended to maintain traceability.