Spi 19-173-4 Class Zz Minus Plug Pin Gage 0.173 in

Product Description

The SPI 19-173-4 is a Class ZZ minus plug pin gage with a 0.173-inch nominal diameter, manufactured from steel for reliable dimensional inspection work. Plug pin gages are precision go/no-go measurement tools used to verify that a drilled, reamed, or bored hole falls within a specified tolerance range. The Class ZZ designation indicates a commercial-grade tolerance level suited for inspection of production parts where high-volume checking is required. With a tolerance of 0.0002 inches on the minus side, this gage allows machinists and quality control technicians to confirm hole size conformance quickly and consistently.

This plug pin gage is used in machine shops, manufacturing facilities, and quality inspection environments where hole diameter verification is part of standard process control. It is appropriate for checking holes in metal, plastic, or composite workpieces where a 0.173-inch nominal diameter is specified. Machinists, toolmakers, and QC inspectors regularly use Class ZZ pin gages during in-process and final inspection stages to ensure parts meet drawing tolerances before assembly or shipment.

Key Features

• Class ZZ minus tolerance classification for commercial-grade dimensional inspection
• 0.173-inch nominal diameter for precise hole checking at that size
• Tolerance of 0.0002 inches for consistent and repeatable measurement results
• Steel construction provides durability and resistance to wear during repeated use
• Compact single-pin gage format for fast go/no-go inspection workflow

Compatibility

Designed as an OEM-style replacement or direct-use plug pin gage for standard Class ZZ minus inspection applications requiring a 0.173-inch diameter check pin.

Installation Notes

Pin gages are handled and used by machinists and quality control technicians following standard metrology practices. Store pin gages in a protected case away from moisture and contaminants to preserve calibration. Clean the gage and the hole being checked before use to prevent false readings caused by chips or debris. Do not force a plug gage into an undersized hole, as this can damage the gage and compromise its calibration.