Spi 19-030-6 Class Zz Minus Plug Pin Gage 0.03 in

Product Description

The SPI 19-030-6 is a Class ZZ minus plug pin gage used to verify bore and hole dimensions in precision machining and quality control applications. Measuring 0.03 inches in diameter, this gage checks whether a hole falls within acceptable dimensional tolerances. It is manufactured from steel for durability and dimensional stability under shop conditions. The Class ZZ designation indicates a standard commercial tolerance grade, and the minus configuration means the gage is made to the lower end of the tolerance range, providing a go-gage function. Machinists, quality technicians, and tool-and-die professionals use this type of gage in production inspection routines.

This pin gage is suited for use in machine shops, manufacturing facilities, and inspection departments where hole diameter verification is required. It is used with standard gage handle sets for single-pin or set-based inspection workflows. The 0.03-inch diameter makes it appropriate for verifying small-bore features common in precision components, instrument housings, and tight-tolerance assemblies.

Key Features

• Class ZZ tolerance grade for standard commercial inspection use
• Minus plug configuration for go-gage hole diameter verification
• 0.03-inch nominal diameter for small-bore applications
• Tolerance of 0.000200 inches (0.0002 mm) for precise dimensional checking
• Steel construction for wear resistance and dimensional stability
• Compatible with standard pin gage handle sets

Compatibility

Designed as an OEM-style replacement or supplemental gage for standard pin gage handle sets used in Class ZZ minus plug gage inspection systems.

Installation Notes

Pin gages are installed and used by machinists and quality control technicians. Before use, clean the gage and the bore being inspected to remove debris, oil, or chips that could affect measurement accuracy. Handle gages by the body or handle, not the gage pin, to avoid introducing measurement error from heat or contamination. Store pin gages in a protective case away from other tools to prevent nicks or surface damage that would compromise accuracy.