Spi 19-001-7 Class Zz Minus Plug Pin Gage 1 Inch

Product Description

The SPI 19-001-7 is a Class ZZ minus plug pin gage machined from steel and used to verify bore diameters to a tight tolerance standard. At 1 inch nominal diameter with a minus tolerance of 0.0002 inches, this gage checks that a hole is at or just below the nominal size, confirming it falls within the acceptable lower limit. Class ZZ is the standard tolerance grade for general-purpose inspection gaging in production and quality-control environments. Machinists, tool-and-die makers, and quality technicians use plug gages like this one to perform go/no-go verification quickly without requiring measurement instruments such as bore micrometers or CMMs.

This gage is suited for use in manufacturing facilities, machine shops, and inspection departments where bore diameter verification is part of a standard quality workflow. It applies to any application requiring confirmation that a 1-inch nominal bore meets dimensional requirements at the lower tolerance boundary. Typical uses include incoming inspection of machined parts, in-process checks on CNC or manual turning operations, and final inspection before assembly.

Key Features

• Class ZZ tolerance grade for general-purpose minus plug gaging
• 1 inch nominal diameter for direct bore verification at that size
• Minus tolerance of 0.0002 inches for lower-limit inspection
• Steel construction for durability in production inspection use
• Compact form factor suitable for handheld go/no-go checks

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for inspecting 1-inch nominal diameter bores in standard production and quality-control applications.

Installation Notes

Plug pin gages are handled and used by machinists, quality technicians, and inspection personnel. Store the gage in its protective case when not in use to prevent nicks or surface contamination that could affect accuracy. Clean the gage and the bore being checked before use to ensure debris does not affect the reading. Do not force the gage into a bore; interference or resistance indicates the bore is undersize and further machining may be required.