Spi 19-604-8 Class Zz Minus Plug Pin Gage 0.604 in

Product Description

The SPI 19-604-8 is a Class ZZ minus plug pin gage machined from steel and used to verify bore and hole dimensions to a high degree of accuracy. The gage measures 0.604 inches in diameter and holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work in production and quality control environments. Class ZZ designates the lowest tolerance class in the ANSI pin gage standard, commonly used for general inspection of parts where high-precision master gages are not required. Machinists, toolmakers, and quality technicians use plug pin gages as part of routine dimensional inspection procedures.

This pin gage is suited for inspecting drilled, reamed, or bored holes in machined components across manufacturing, maintenance, and repair operations. The minus designation indicates the gage is manufactured to the minus side of the nominal diameter, which is standard practice for plug gages used to check minimum hole size acceptance. It is appropriate for use in machine shops, production lines, and metrology labs where consistent, repeatable hole inspection is required.

Key Features

• 0.604 inches nominal diameter for direct bore inspection at that size
• Class ZZ tolerance class per ANSI standards for general inspection use
• Minus designation — manufactured to the minus side of nominal for minimum hole acceptance checking
• Steel construction for durability and dimensional stability during repeated use
• 0.0002 inches tolerance for reliable go/no-go measurement results

Compatibility

Designed as a standard ANSI Class ZZ minus plug pin gage for general-purpose hole inspection of 0.604 inch diameter bores in machined parts and assemblies.

Installation Notes

Plug pin gages are handled and used by machinists, toolmakers, and quality control technicians — no installation in the traditional sense applies. Clean the gage and the bore before use to prevent debris from affecting measurement accuracy. Store the gage in a protective case away from other tooling to prevent nicks or surface damage that could compromise dimensional accuracy. Do not force the gage into an undersized hole, as this can damage the gage surface and introduce measurement error.