Spi 19-143-7 Class Zz Minus Plug Pin Gage 0.143 in

Product Description

The SPI 19-143-7 is a Class ZZ minus plug pin gage used to verify hole diameter in precision machining and quality control applications. Manufactured from steel, it measures a nominal diameter of 0.143 inches with a tolerance of 0.0002 inches, conforming to Class ZZ minus specifications. Class ZZ gages are the standard go/no-go inspection tool for checking bore dimensions in production and maintenance environments. Machinists, tool-and-die technicians, and quality control inspectors use plug pin gages as part of standard dimensional verification workflows.

This gage is suited for inspecting drilled, reamed, or bored holes in metalworking, fabrication, and manufacturing settings. At 0.143 inches nominal diameter, it fits into inspection routines where small-bore accuracy is critical. The minus designation means the gage is manufactured to the lower tolerance boundary, making it appropriate for go-gage applications where confirming minimum acceptable hole size is required. It is a single-unit gage intended for benchtop or in-process inspection use.

Key Features

• Class ZZ minus tolerance class for go-gage hole inspection
• Nominal diameter of 0.143 inches for small-bore verification
• Tolerance of 0.0002 inches for precise dimensional control
• Steel construction for durability in shop environments
• Single-piece design for straightforward handling and storage

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in dimensional inspection of holes with a nominal diameter of 0.143 inches across general metalworking and manufacturing applications.

Installation Notes

Plug pin gages are handled and used by machinists and quality control technicians following standard metrology practices. Clean the gage and the bore being inspected before use to prevent false readings from debris or oil. Store the gage in a protective case when not in use to prevent damage to the precision-ground surface. Do not force the gage into an undersized bore, as this can damage both the gage and the workpiece.