Spi 19-225-2 Class Zz Minus Plug Pin Gage 0.225 in

Product Description

The SPI 19-225-2 is a Class ZZ minus plug pin gage machined to a 0.225-inch nominal diameter with a tolerance of 0.0002 inches. Plug pin gages are go/no-go precision inspection tools used to verify bore and hole dimensions to a known standard. The Class ZZ designation indicates a working-grade gage suited for shop-floor inspection rather than lab-grade metrology. Constructed from steel for durability and dimensional stability, this gage is a standard tool for machinists, quality control technicians, and tool-and-die professionals verifying drilled, reamed, or punched hole sizes during production and incoming inspection.

This gage is appropriate for inspecting small-diameter bores in machined components, sheet metal fabrications, and plastic or composite parts where hole size conformance is critical. It is used in manufacturing environments, machine shops, and production facilities where consistent dimensional verification is required. The minus designation means the gage is ground to the lower limit of the nominal diameter, making it suitable for go-gage applications where the part must accept the gage to pass.

Key Features

• Class ZZ working-grade tolerance for reliable shop-floor hole inspection
• 0.225-inch nominal diameter with 0.0002-inch tolerance for precise measurement
• Minus designation ground to lower limit for go-gage dimensional verification
• Steel construction for wear resistance and long service life
• Compact single-piece design for straightforward manual inspection use

Compatibility

Designed as an OEM-style working gage for use in standard plug gage handles and holders sized to accept 0.225-inch diameter pin gages.

Installation Notes

Plug pin gages are handled and used by quality control technicians and machinists and require no permanent installation. Clean the gage and the bore being inspected before use to prevent false readings caused by debris or oil contamination. Handle with care to avoid dropping, as impact damage can alter the ground diameter and invalidate the gage. Store in a protective case away from other metal tools to prevent surface damage and maintain calibration integrity.