Spi 19-446-4 Class Zz Minus Plug Pin Gage 0.446 in

Product Description

The SPI 19-446-4 is a Class ZZ minus plug pin gage designed to verify hole diameters in precision machining and inspection applications. This gage measures a nominal diameter of 0.446 inches and is manufactured from steel for durability and dimensional stability. It carries a tolerance of 0.0002 inches, which meets Class ZZ specifications for go/no-go gauging in production and quality control environments. Machinists, toolmakers, and quality technicians use plug pin gages like this one to confirm that drilled, reamed, or bored holes fall within acceptable tolerance ranges before parts advance in the production process.

This pin gage is suited for use in machine shops, manufacturing facilities, and inspection departments where precise hole verification is required. The minus designation indicates the gage is ground to the lower boundary of the nominal diameter, making it appropriate for checking minimum material condition in standard go/no-go setups. It is a straightforward hand-measurement tool that integrates into conventional gage block and pin gage set workflows.

Key Features

• 0.446 inch nominal diameter for direct hole verification at that dimension
• Class ZZ tolerance of 0.0002 inches for production-grade accuracy
• Minus designation confirms minimum material condition boundary gauging
• Steel construction provides wear resistance and dimensional stability
• Compact single-pin format compatible with standard pin gage handles and sets

Compatibility

Designed as a replacement or supplemental pin for standard Class ZZ plug pin gage sets requiring a 0.446 inch minus member.

Installation Notes

Pin gages are hand-measurement instruments installed by machinists or quality technicians without special tools. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain dimensional accuracy. Do not force the pin into an undersized hole, as this can damage the gage or the workpiece. Store separately or in a designated gage holder to avoid contact damage.