Spi 19-270-8 Class Zz Minus Plug Pin Gage 0.27 in

Product Description

The SPI 19-270-8 is a Class ZZ minus plug pin gage machined from steel, used to verify that a hole or bore meets a minimum acceptable diameter. At 0.27 inches in diameter with a tolerance of 0.0002 inches, this gage is used in go/no-go inspection routines where dimensional accuracy is critical. Class ZZ designates it as a working-grade gage appropriate for shop-floor inspection rather than laboratory or master-gage applications. Machinists, tool-and-die makers, and quality control technicians use plug pin gages like this to confirm that drilled, reamed, or bored features fall within specified limits before parts move to the next stage of production.

This gage is suited for incoming inspection, in-process quality checks, and final part verification in machine shops, manufacturing cells, and fabrication facilities. The minus designation means the gage is undersized relative to the nominal diameter by the stated tolerance, making it appropriate for checking the low end of a hole tolerance. It is used wherever precision hole sizing must be confirmed quickly and reliably without the use of electronic measurement equipment.

Key Features

• Class ZZ working-grade tolerance for shop-floor go/no-go inspection
• Minus designation confirms low-limit hole sizing
• 0.27 inch nominal diameter with 0.0002 inch tolerance
• Steel construction for durability under repeated use
• Compact and lightweight at 0.2 pounds for easy handling

Compatibility

Designed as a working-grade plug pin gage for use in standard go/no-go inspection applications involving 0.27 inch nominal diameter holes in machined components.

Installation Notes

Plug pin gages are handled and used by machinists and quality control personnel following standard metrology practices. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain accuracy. Do not force the gage into a feature; resistance indicates the hole is undersize. Store separately from other tooling to avoid contact damage to the precision-ground surface.