Spi 19-554-5 Class Zz Minus Plug Pin Gage 0.554 in

Product Description

The SPI 19-554-5 is a Class ZZ minus plug pin gage with a nominal diameter of 0.554 inches and a tolerance of 0.0002 inches. It is used to verify that a hole or bore meets minimum dimensional acceptance criteria. The minus designation means the gage is manufactured to the lower end of the tolerance band, making it suitable for go/no-go inspection workflows where confirming minimum acceptable hole size is the objective. Constructed from steel, this gage is a standard hand-measurement tool used in machine shops, manufacturing facilities, and quality control environments by machinists, inspectors, and metrology technicians.

This pin gage is suited for precision inspection applications where hole diameter verification is required on machined components, castings, or assemblies. Class ZZ is a commercial-grade tolerance class appropriate for general inspection use rather than master or reference gage applications. The 0.554-inch size fits common bore inspection tasks encountered in production and maintenance environments. Technicians working in fabrication, tooling, and quality assurance departments will find this gage compatible with standard pin gage handle systems used in day-to-day dimensional inspection workflows.

Key Features

• Class ZZ tolerance class for commercial-grade hole inspection
• Minus designation for lower-tolerance-band go/no-go gauging
• 0.554-inch nominal diameter for precise bore verification
• 0.0002-inch tolerance for consistent measurement accuracy
• Steel construction for durability in production environments

Compatibility

Designed for use with standard pin gage handle sets as an OEM-style replacement or addition to Class ZZ minus pin gage sets used in general commercial inspection applications.

Installation Notes

Pin gages are handled and stored by quality control and machining personnel and do not require mechanical installation. Keep the gage clean and lightly oiled when not in use to prevent corrosion on the steel surface. Do not force the gage into a bore; if resistance is encountered, the hole may be undersized or contain burrs that should be addressed before gauging. Store separately from other gages to prevent contact damage to the precision-ground surface.