Spi 19-805-1 Class Zz Minus Plug Pin Gage 0.805 in

Product Description

The SPI 19-805-1 is a Class ZZ minus plug pin gage machined to a 0.805-inch nominal diameter with a tolerance of 0.0002 inches. Plug pin gages are precision go/no-go measurement tools used to verify hole diameter and concentricity in machined parts, castings, and fabricated components. The minus designation means the gage is ground to the lower boundary of the tolerance band, making it suitable for checking maximum material condition. This gage is constructed from steel for durability and dimensional stability across repeated use in shop-floor or inspection environments. Metrology technicians, machinists, and quality control inspectors are the primary users.

This pin gage is suited for dimensional inspection in manufacturing, machining, and fabrication settings where hole-size verification is required. It is used in both production-line go/no-go checks and incoming inspection of drilled, reamed, or bored holes nominally sized at 0.805 inches. The Class ZZ designation places it in the general-purpose inspection grade, appropriate for production gaging rather than laboratory or master-standard applications. Individual unit packaging makes it practical for tool-crib stocking and field inspection kits.

Key Features

• Class ZZ minus tolerance ground to 0.0002 inches for reliable go/no-go inspection
• 0.805-inch nominal diameter targets common drilled and reamed hole sizes
• Steel construction provides durability and resistance to wear during repeated use
• Minus designation ensures gage falls at the lower tolerance boundary for maximum material condition checks
• Individual unit packaging supports tool-crib and field inspection stocking

Compatibility

Designed as a general-purpose Class ZZ plug pin gage for inspecting holes with a nominal diameter of 0.805 inches in machined, cast, or fabricated parts across a wide range of manufacturing applications.

Installation Notes

Plug pin gages are handled by qualified machinists or quality control inspectors following standard metrology practices. Clean and deburr the hole being inspected before inserting the gage to avoid false readings or gage damage. Store the gage in its protective sleeve or case when not in use to prevent nicks and corrosion that would affect calibration. Periodic recalibration against a traceable master standard is recommended to maintain measurement integrity.