Spi 19-642-8 Class Zz Minus Plug Pin Gage 0.642 in

Product Description

The SPI 19-642-8 is a Class ZZ minus plug pin gage designed for go/no-go inspection of bored holes, drilled passages, and machined features requiring precise dimensional verification. Built from steel, this pin gage measures a nominal diameter of 0.642 inches with a minus tolerance of 0.0002 inches, making it suitable for standard-tolerance inspection work in production and quality-control environments. Class ZZ gages are the most commonly used grade for general inspection and are typically handled by machinists, toolroom technicians, and quality assurance personnel.

This pin gage is used in manufacturing, fabrication, and inspection settings where consistent hole-diameter verification is required. Typical applications include checking bore sizes on machined parts, verifying drill press output, and confirming hole geometry on sheet metal or cast components. The 0.642-inch diameter targets a specific nominal bore size in standard inch-measurement workflows.

Key Features

• Class ZZ tolerance grade suited for general production inspection
• Minus plug configuration for lower-limit dimensional checking
• 0.642 inch nominal diameter with 0.0002 inch tolerance
• Steel construction for durability in shop environments
• Single-piece packaging for individual replacement or kit supplementation

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with pin gage handles and sets following inch-measurement conventions in general manufacturing inspection applications.

Installation Notes

Pin gages should be handled with clean cotton gloves or lint-free cloths to prevent corrosion from skin oils. Before use, verify the gage and the workpiece bore are at the same ambient temperature to avoid thermal expansion errors. Store the gage in its protective case when not in use, and clean and lightly oil the gage surface periodically to maintain accuracy and prevent rust.