Spi 19-348-2 Class Zz Minus Plug Pin Gage 0.348 in

Product Description

The SPI 19-348-2 is a Class ZZ minus plug pin gage with a 0.348-inch nominal diameter, designed for go/no-go tolerance verification in production and inspection environments. Built from steel, it delivers a tolerance of 0.0002 inches on the minus side of nominal, making it suitable for checking hole sizes in manufactured parts where dimensional accuracy is critical. Machinists, quality technicians, and tool room personnel use plug pin gages like this one to verify bore diameters quickly and reliably without the need for complex measuring setups.

Class ZZ is the most commonly used gage tolerance class for general-purpose inspection of production parts. The 19-348-2 is appropriate for shop floor and quality lab use in metalworking, fabrication, and precision machining applications. Its steel construction holds up under normal production use and provides consistent results across repeated measurements. The minus designation means the gage is manufactured to the low side of the nominal diameter, following standard gage-maker conventions for plug gage sizing.

Key Features

• Class ZZ tolerance class for general-purpose hole inspection
• Minus designation ground to the low side of 0.348-inch nominal diameter
• 0.0002-inch tolerance for reliable dimensional verification
• Steel construction for durability under shop floor conditions
• Compact single-piece design for fast go/no-go checks

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for verifying 0.348-inch nominal bore diameters in standard go/no-go inspection applications.

Installation Notes

Plug pin gages are handled and used by quality technicians and machinists following standard metrology practices. Before use, clean both the gage and the workpiece bore to remove chips, oil, or debris that could affect readings. Store the gage properly when not in use to prevent corrosion or surface damage to the ground diameter. Do not force the gage into an undersized bore, as this can alter the gage diameter and compromise measurement accuracy.