Spi 19-272-4 Class Zz Minus Plug Pin Gage 0.272 in

Product Description

The SPI 19-272-4 is a Class ZZ minus plug pin gage with a 0.272-inch nominal diameter, used to verify bore and hole dimensions in precision machining and inspection applications. Manufactured from steel, this pin gage holds a minus tolerance of 0.000200 inches from the nominal size, making it suitable for go/no-go inspection work where part acceptance depends on tight dimensional control. Toolroom inspectors, machinists, and quality control technicians use Class ZZ plug gages to check that drilled, reamed, or bored holes fall within specified limits. The steel construction provides durability and resistance to wear under repeated use in shop-floor or inspection-bench environments.

Class ZZ plug pin gages are designed for general-purpose inspection of hole diameters in production and toolroom settings. The 0.272-inch diameter range covers a common fastener and bore size encountered in both light manufacturing and precision assembly operations. This gage is handled as an individual pin and is suited for benchtop inspection use or integration into a modular pin gage set. It applies to any industry where dimensional verification of holes is part of quality assurance, including metal fabrication, aerospace component inspection, and general machining.

Key Features

• Class ZZ minus tolerance of 0.000200 inches for general-purpose hole inspection
• Nominal diameter of 0.272 inches covers a widely used bore and fastener size
• Steel construction for durability and wear resistance in shop environments
• Minus designation confirms the pin is ground below nominal for go-gage applications
• Individual pin format for standalone use or addition to a modular gage set

Compatibility

Designed as a general-purpose Class ZZ plug pin gage suitable for use in standard modular pin gage handles and holders that accept 0.272-inch diameter pins. No specific compatible system families or replacement part numbers were provided in the product data.

Installation Notes

Plug pin gages are handled and used by machinists, toolroom technicians, and quality control inspectors. Clean the gage and the bore being checked before use to prevent debris from affecting measurement accuracy. Store pin gages in a protective case away from other tools to prevent surface damage. Apply light gage oil when storing for extended periods to inhibit corrosion on the steel surface.