Spi 19-287-2 Class Zz Minus Plug Pin Gage 0.287 in

Product Description

The SPI 19-287-2 is a Class ZZ minus plug pin gage designed for go/no-go inspection of machined holes and bored features. It is manufactured from steel and holds a tolerance of 0.0002 inches, making it suitable for dimensional verification in production and quality control environments. At 0.287 inches in diameter, this pin gage is used to confirm that a hole or bore meets minimum size requirements. Machinists, quality technicians, and tool room professionals use plug pin gages as part of standard inspection workflows on the shop floor or in a metrology lab.

This gage is appropriate for use in both light manufacturing and precision machining environments where hole location and diameter conformance must be verified. The Class ZZ designation indicates a commercial-grade tolerance class, commonly specified for general-purpose inspection rather than master or reference gage applications. It is well suited for incoming inspection, in-process checks, and final part verification on machined components, castings, and fabricated assemblies.

Key Features

• Class ZZ minus tolerance class for go/no-go hole inspection
• 0.287 inches nominal diameter for precise hole verification
• Tolerance of 0.0002 inches for reliable dimensional conformance
• Steel construction for durability in production environments
• Single-piece unit quantity suitable for individual tool room or inspection station use

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for use with standard go/no-go gage handles and holders sized to accept 0.287-inch diameter pins.

Installation Notes

Plug pin gages are handled and used by machinists and quality control technicians. Before use, clean the gage and the hole to be inspected to remove chips, coolant, and debris that could affect the measurement. Apply a light coat of gage oil or rust preventative when storing to protect the steel surface. Do not force a minus plug gage into an undersize hole, as this can damage the gage land and compromise accuracy.