Spi 19-424-1 Class Zz Minus Plug Pin Gage 0.424 in

Product Description

The SPI 19-424-1 is a Class ZZ minus plug pin gage used to verify bore and hole diameters in precision machining and inspection applications. It measures 0.424 inches in diameter and is manufactured from steel for durability and dimensional stability under repeated use. The minus tolerance configuration means the gage diameter is ground to the low side of the nominal dimension, making it a go-style reference tool for confirming minimum acceptable hole size. Machinists, quality control technicians, and toolroom professionals use this gage as part of standard dimensional inspection routines on production and prototype parts.

This pin gage is suited for use in machine shops, manufacturing facilities, and quality assurance environments where hole diameter verification is required. It applies to inspection of drilled, reamed, or bored holes in metal, plastic, and composite workpieces. The 0.424-inch size fits within a standard pin gage set or can be used as a standalone replacement gage for that specific diameter. It is appropriate for both incoming inspection and in-process quality checks on the production floor.

Key Features

• Class ZZ tolerance grade suitable for general-purpose inspection and shop-floor use
• Minus plug configuration ground to the low side of nominal for go-gage applications
• 0.424-inch nominal diameter for precise bore verification at that dimension
• Steel construction provides wear resistance and dimensional stability
• 0.0002-inch tolerance ensures reliable and repeatable measurement results

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for use in standard pin gage handles and holders sized for 0.424-inch diameter gage pins.

Installation Notes

Pin gages are handled and used by machinists and quality technicians following standard metrology practices. Store the gage clean and lightly oiled to prevent corrosion and protect the ground surface. When inserting the gage into a bore, apply light, controlled hand pressure only — never force the gage, as this can damage the gage or the workpiece. Clean both the gage and the bore before use to ensure accurate results.