Spi 19-335-9 Class Zz Minus Plug Pin Gage 0.3350 in

Product Description

The SPI 19-335-9 is a Class ZZ minus plug pin gage designed to verify bore and hole diameters in precision machining and inspection applications. This single-ended gage measures 0.3350 inches in diameter with a tolerance of 0.0002 inches, built to Class ZZ standards for general-purpose go/no-go inspection work. Constructed from steel for dimensional stability, the 19-335-9 is a standard tool on the shop floor for machinists, quality control technicians, and tool-and-die professionals who need reliable, repeatable hole measurement on production parts.

This plug gage is used in manufacturing and inspection environments where bore size verification is required before assembly or finishing. Typical applications include checking drilled, reamed, or bored holes in metal and plastic components. The Class ZZ tolerance designation makes it appropriate for inspection of commercial-grade work rather than high-precision or laboratory-grade tolerances. It is well suited to job shops, production facilities, and maintenance departments performing dimensional checks on mechanical parts.

Key Features

• 0.3350-inch nominal diameter for direct hole-size verification
• Class ZZ minus tolerance of 0.0002 inches for general-purpose inspection
• Steel construction for durability and dimensional stability under shop conditions
• Single-ended design for straightforward go-side checking
• Compact and lightweight at 0.2 pounds for easy handling

Compatibility

Designed as an OEM-style replacement or standard addition for Class ZZ plug gage sets used in general-purpose bore inspection applications requiring a 0.3350-inch diameter measurement.

Installation Notes

Plug pin gages are handled and used by machinists and quality control inspectors following standard metrology practices. Clean the gage and the bore being checked before use to prevent measurement errors caused by debris or oil buildup. Store the gage in its case or a protected location to prevent nicks and corrosion that would compromise the tolerance. Do not force the gage into an undersized bore, as this can damage the gage surface and invalidate its accuracy.