Spi 19-515-6 Class Zz Minus Plug Pin Gage 0.515 in

Product Description

The SPI 19-515-6 is a Class ZZ minus plug pin gage machined from steel for dimensional inspection of holes and bores. It measures 0.515 inches in diameter and carries a minus tolerance of 0.0002 inches, meaning the gage is manufactured to the low side of the nominal dimension. Class ZZ is the standard tolerance grade for general-purpose go/no-go inspection work in production and quality-control environments. Machinists, tool-and-die makers, and quality technicians use plug gages to verify bore diameter conformance quickly and repeatably without requiring a measuring instrument readout.

This gage is suited for use in machine shops, manufacturing facilities, and maintenance departments where hole diameter verification is part of a standard inspection routine. It fits into go/no-go gage handle sets for single-end or double-end use. Applications include checking drilled, reamed, or bored holes in metal, plastic, and composite workpieces where dimensional accuracy is critical to part function or assembly fit.

Key Features

• Class ZZ tolerance grade for general-purpose production inspection
• Minus plug configuration — manufactured to the low side of nominal diameter
• 0.515 inches nominal diameter for direct hole size verification
• Tolerance of 0.0002 inches for reliable go/no-go discrimination
• Steel construction for durability in shop environments
• Compatible with standard gage handle sets for efficient single-hand operation

Compatibility

Designed as a standard replacement or addition to Class ZZ plug gage sets used in general-purpose dimensional inspection applications. Compatible with gage handles sized for 0.515-inch diameter pin gages.

Installation Notes

Plug pin gages are installed and used by machinists and quality-control technicians without special tooling. Ensure the workpiece bore and gage are clean and free of chips or debris before use to prevent false readings or gage wear. Handle gages with care to avoid dropping, which can alter the calibrated diameter. Periodic recalibration against traceable standards is recommended to maintain measurement integrity.