Spi 19-443-1 Class Zz Minus Plug Pin Gage 0.443 in

Product Description

The SPI 19-443-1 is a Class ZZ minus plug pin gage with a 0.443 inch nominal diameter, manufactured from steel for dimensional inspection work. Plug pin gages are precision measurement tools used to verify hole diameters, slot widths, and bore tolerances to confirm a workpiece is within spec. The Class ZZ designation defines this as a general-purpose inspection grade gage, and the minus tolerance configuration means the gage is ground to the low side of the nominal, at 0.0002 inch tolerance. Machinists, toolmakers, quality control technicians, and production floor inspectors rely on this type of gage for fast, reliable go/no-go and dimensional verification tasks.

This gage is suited for use in machine shops, manufacturing facilities, job shops, and quality labs where hole size verification is part of standard inspection procedure. It is appropriate for checking drilled, reamed, or bored holes in metal, plastic, or composite workpieces where the nominal hole diameter is 0.443 inch. The steel construction provides durability under repeated use in production inspection environments.

Key Features

• Class ZZ tolerance grade for general-purpose dimensional inspection
• Minus configuration: gage is ground to the low side of nominal diameter
• 0.443 inch nominal diameter
• 0.0002 inch tolerance for reliable go/no-go and close-tolerance checks
• Steel construction for durability and wear resistance in production environments

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with any inspection fixture, gage handle, or pin gage set that accepts 0.443 inch diameter pins in general-purpose dimensional inspection applications.

Installation Notes

Plug pin gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Before use, clean the gage and the hole being measured to remove chips, coolant, or debris that could affect accuracy. Do not force the gage into an undersized hole, as this can damage the gage surface and compromise calibration. Store in a protective case away from other metal tools to prevent nicking the precision-ground surface.