Spi 19-275-7 Class Zz Minus Plug Pin Gage 0.275 in

Product Description

The SPI 19-275-7 is a Class ZZ minus plug pin gage machined from steel, designed to verify hole diameters in production and inspection environments. At 0.275 inches in diameter with a tolerance of 0.0002 inches, this gage gives technicians and quality control professionals a reliable go/no-go reference for confirming dimensional accuracy on machined bores and drilled holes. Class ZZ is the standard tolerance class for plug gages used in general-purpose inspection, making this tool appropriate for shop-floor checks and incoming inspection alike. It weighs 0.2 pounds and ships as a single unit.

This pin gage is suited for use in manufacturing, maintenance, and inspection settings where precise hole sizing must be confirmed. Machinists, tool-and-die makers, and quality technicians reach for this type of gage when checking drilled, reamed, or bored holes to ensure they fall within specification. The minus designation indicates the gage is ground to the lower boundary of the nominal diameter, making it a not-go member in a standard gage pair application.

Key Features

• 0.275 inch nominal diameter for direct hole-size verification
• Class ZZ tolerance class suited for general-purpose shop and inspection use
• Minus designation ground to the lower tolerance boundary of the nominal size
• 0.0002 inch tolerance for precise dimensional control
• Steel construction for durability in production environments
• Single-piece package with a minimum order quantity of one

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for use in standard go/no-go gage sets and standalone hole inspection applications where a 0.275 inch diameter reference is required.

Installation Notes

Plug pin gages are handled and used by machinists, quality technicians, and metrologists — no power tools or utility shutoffs are required. Clean the gage and the workpiece bore before use to prevent debris from affecting measurement results. Store the gage in its protective case away from other metal tools to prevent nicks or corrosion that could compromise the ground surface. Follow ASME B89.1.5 guidelines for gage handling, calibration intervals, and inspection procedures.