Spi 19-109-8 Class Zz Minus Plug Pin Gage 0.109 in

Product Description

The SPI 19-109-8 is a Class ZZ minus plug pin gage machined from steel and used to verify that a drilled, reamed, or punched hole falls within a specified minimum size tolerance. At 0.109 inches in diameter, this gage is used in a GO/NO-GO inspection process where the minus designation means the gage is ground to the low end of the tolerance band. The tolerance on this gage is 0.000200 inches (0.0002 mm), which meets Class ZZ standards for general-purpose inspection work. Machinists, tool and die makers, and quality control technicians use pin gages like this one to quickly confirm hole size conformance on the shop floor or in an inspection lab.

This plug pin gage is suited for use in manufacturing, fabrication, and precision machining environments where hole diameter verification is part of standard quality control procedures. It is appropriate for inspecting production parts, checking tooling, and validating fixtures in both job-shop and high-volume production settings. The 0.109 inch diameter makes it a practical choice for applications involving small fastener holes, pilot holes, and similar close-tolerance features in metal and other rigid materials.

Key Features

• Class ZZ minus tolerance designation for low-end hole size verification
• 0.000200 inch (0.0002 mm) gage tolerance for general-purpose inspection accuracy
• Steel construction provides durability for repeated shop-floor use
• 0.109 inch nominal diameter suits small hole inspection applications
• Single-piece design requires no assembly before use

Compatibility

Designed as an OEM-style replacement or direct addition to standard pin gage sets used for general-purpose hole inspection in machining and fabrication environments.

Installation Notes

Plug pin gages are handled and used by machinists or quality control technicians and require no installation. Clean the gage and the workpiece hole before use to prevent debris from affecting measurement results. Store pin gages in a protective case away from other tools to prevent surface damage that could affect accuracy. Calibrate or verify the gage against a traceable standard at regular intervals per your facility quality plan.