Spi 19-426-6 Class Zz Minus Plug Pin Gage 0.426 in

Product Description

The SPI 19-426-6 is a Class ZZ minus plug pin gage used to verify bore and hole diameters in precision inspection and quality-control workflows. It measures 0.426 inches in diameter and is manufactured from steel for consistent dimensional stability under shop-floor conditions. The minus tolerance configuration means the gage is made to the low side of the nominal diameter, following standard GO/NO-GO gage practice. With a tolerance of 0.0002 inches, this gage is suited for checking machined holes where tight dimensional control is required. Machinists, quality technicians, and tool-room professionals use plug pin gages as part of standard dimensional verification procedures.

This gage is appropriate for use in manufacturing, machine shop, and quality assurance environments where hole diameter conformance must be verified to close tolerances. It is a hand-held, single-diameter inspection tool used in conjunction with gage blocks, ring gages, or other reference standards in a complete inspection program. Typical applications include checking drilled, reamed, or bored holes in metal components across general machining and precision manufacturing operations.

Key Features

• 0.426 inch nominal diameter for direct hole inspection at that size
• Class ZZ tolerance class — the standard commercial-grade class for plug gages
• Minus configuration — manufactured to the low side of nominal for proper GO gage practice
• 0.0002 inch tolerance for reliable close-tolerance inspection
• Steel construction for dimensional stability and wear resistance in shop use
• Single-piece plug gage format — no assembly required, ready for immediate use

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with compatible gage handle sets in dimensional inspection of machined holes at 0.426 inch nominal diameter.

Installation Notes

Plug pin gages are handled and used by quality technicians or machinists — no power tools or utilities need to be shut down for inspection use. Store gages in a protective case away from moisture to prevent corrosion on the steel body. Clean and lightly oil the gage after use following standard metrology handling practices. Calibrate or verify against a traceable reference standard at intervals appropriate to your facility's quality management program.