Spi 19-408-4 Class Zz Minus Plug Pin Gage 0.408 in

Product Description

The SPI 19-408-4 is a Class ZZ minus plug pin gage ground to a nominal diameter of 0.408 inches with a minus tolerance of 0.0002 inches. Pin gages are single-ended cylindrical measurement tools used to verify hole diameters, slot widths, and feature locations to a defined tolerance class. This gage is manufactured from steel for dimensional stability and wear resistance. Class ZZ is the general-purpose tolerance class defined for production inspection and shop-floor use, making this gage appropriate for machinists, quality technicians, and tool-room professionals who need reliable go/no-go or attribute measurement capability.

This gage is suited for production and inspection environments where hole feature acceptance must be verified at 0.408 inches nominal diameter. Common applications include verifying drilled, reamed, or punched holes in metal fabrication, machined components, and stamped parts. The minus designation means the gage is ground below nominal, which is standard for go-gage applications where the gage must freely enter an acceptable hole. Machinists and quality inspectors in job shops, production facilities, and tool rooms are the primary users.

Key Features

• Class ZZ tolerance class for general production and shop-floor inspection use
• Minus tolerance ground below nominal — suited for go-gage attribute inspection
• 0.0002 inch tolerance for consistent, repeatable diameter verification
• Steel construction for dimensional stability and extended service life
• 0.408 inch nominal diameter covers a common drilled and reamed hole size

Compatibility

Designed as a direct-use plug pin gage for any inspection or quality application requiring attribute measurement of a 0.408 inch nominal diameter hole feature in accordance with Class ZZ tolerance standards.

Installation Notes

Pin gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin contact. Before use, verify the gage and workpiece surfaces are free of burrs, chips, and contaminants that could affect measurement accuracy or damage the gage. Store the gage in a protective case or designated gage block storage when not in use to prevent nicks and wear. Periodic recalibration against traceable standards is recommended to confirm dimensional integrity over time.