Spi 19-756-6 Class Zz Minus Plug Pin Gage 0.756 in

Product Description

The SPI 19-756-6 is a Class ZZ minus plug pin gage with a nominal diameter of 0.756 inches, manufactured from steel. Plug pin gages are precision measuring tools used to verify that a drilled, reamed, or bored hole falls within a specified dimensional tolerance. The Class ZZ designation indicates a commercial-grade tolerance suitable for general inspection work. The minus configuration means the gage is ground to the lower limit of the nominal size, allowing a go/no-go inspection workflow when paired with the appropriate plus gage. A tolerance of 0.0002 inches governs the gage's own dimensional accuracy.

This gage is used in machine shops, fabrication facilities, and quality control environments where hole diameter verification is required. It is appropriate for inspecting bored or drilled holes in metal components across a range of industries including manufacturing, aerospace fabrication, and general mechanical assembly. Inspectors, machinists, and quality technicians are the primary users. The 0.756-inch diameter makes it suitable for medium-bore inspection work where precise fit verification is needed before assembly.

Key Features

• Class ZZ tolerance classification for commercial-grade go/no-go inspection
• Minus configuration ground to the lower limit of the nominal 0.756-inch diameter
• Steel construction for durability and dimensional stability under repeated use
• Dimensional tolerance of 0.0002 inches on the gage itself for reliable measurements
• Single-piece design — no assembly required, ready to use out of the package

Compatibility

Designed as a standard Class ZZ minus plug pin gage for general hole inspection applications requiring a 0.756-inch nominal diameter check.

Installation Notes

Plug pin gages are hand tools and do not require mechanical installation. Ensure the workpiece is clean and free of burrs, chips, or debris before attempting to gage a hole, as contamination will affect reading accuracy and may damage the gage surface. Handle the gage with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Store in a protective case away from other metal tools to preserve the precision-ground surface.