Spi 19-122-1 Class Zz Minus Plug Pin Gage 0.122 in

Product Description

The SPI 19-122-1 is a Class ZZ minus plug pin gage machined to a 0.122-inch nominal diameter with a minus tolerance of 0.0002 inches. Pin gages are used to verify hole diameters, slot widths, and feature locations to tight dimensional tolerances. The Class ZZ designation identifies this as a working gage grade, suitable for shop-floor inspection and go/no-go verification tasks. The steel construction provides the wear resistance and dimensional stability required for repeated use in production and maintenance environments. Machinists, quality technicians, and tool-and-die professionals are the primary users.

This gage is suited for dimensional inspection in manufacturing, machining, and fabrication settings where hole diameter verification is required. It is used to check drilled, reamed, or punched holes against a 0.122-inch nominal specification. The minus tolerance means the gage is ground to the lower allowable boundary, making it appropriate for go-gage applications where confirming minimum acceptable hole size is the objective.

Key Features

• 0.122-inch nominal diameter for direct hole-size verification
• Class ZZ working gage grade for shop-floor inspection use
• Minus tolerance configuration: 0.0002 inches below nominal
• Steel construction for wear resistance and dimensional stability
• Single-piece gage format for straightforward go/no-go checks

Compatibility

Designed as a working-grade plug pin gage for use in any inspection process requiring verification of a 0.122-inch nominal hole or feature diameter to Class ZZ tolerance standards.

Installation Notes

Plug pin gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Apply a light film of instrument oil when storing to protect the ground surface. Do not force the gage into a hole; resistance indicates the feature is undersize. Calibrate or re-verify the gage against a traceable standard at intervals appropriate to your quality management system.