Spi 19-301-1 Class Zz Minus Plug Pin Gage 0.301 in

Product Description

The SPI 19-301-1 is a Class ZZ minus plug pin gage machined from steel, designed to verify bore and hole diameters to a nominal size of 0.301 inches. Class ZZ gages are the standard working-class gage used in production inspection and quality control environments. This minus gage is manufactured to a tolerance of 0.0002 inches, ensuring accurate go/no-go inspection of machined parts. Machinists, toolmakers, and quality technicians use plug pin gages like this one to confirm that drilled, reamed, or bored holes meet dimensional requirements before parts advance through production.

This gage is suited for use in machine shops, production floors, and inspection departments handling precision metalwork. It is appropriate for verifying hole diameters in ferrous and non-ferrous workpieces where tight dimensional control is required. The 0.301-inch nominal diameter makes it a direct fit for inspection tasks targeting that specific bore size in components produced to inch-standard drawings.

Key Features

• Class ZZ minus tolerance classification for production-grade go/no-go inspection
• Nominal diameter of 0.301 inches for targeted bore verification
• Tolerance of 0.0002 inches for precise dimensional control
• Steel construction for durability in shop environments
• Compact and lightweight at 0.2 pounds for easy single-hand use

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with conventional gage handle systems accepting the 0.301-inch diameter range.

Installation Notes

Plug pin gages require no installation but should be handled with care to prevent surface damage that could affect measurement accuracy. Clean the gage and the bore to be measured before use to remove chips, coolant, or debris. Store the gage in its protective case when not in use, and periodically verify the gage against a calibrated master to confirm it remains within tolerance. Gaging should be performed at standard reference temperature conditions, typically 68 degrees F, per common metrology practice.