Spi 19-510-7 Class Zz Minus Plug Pin Gage 0.51 in Steel

Product Description

The SPI 19-510-7 is a Class ZZ minus plug pin gage used to verify bore and hole diameters in precision machining and inspection applications. This gage checks whether a hole is at or above the minimum acceptable size by using a minus tolerance ground to 0.0002 inches under nominal, confirming the hole falls within spec when the gage passes through. The 0.51-inch nominal diameter steel body is precision-ground for consistent, repeatable results. Machinists, quality technicians, and tool-and-die professionals use pin gages like this one as a fast, reliable go/no-go check during in-process or final inspection.

This plug pin gage is suited for use in machine shops, manufacturing facilities, and quality control departments where tight dimensional tolerances must be verified on drilled, reamed, or bored holes. Class ZZ is the standard commercial-grade tolerance class for plug gages, appropriate for general-purpose inspection work where high-volume checking is performed and extreme precision gage tolerances are not required. The minus designation means the gage is ground below nominal, functioning as a go gage to confirm minimum hole size compliance.

Key Features

• Class ZZ tolerance class for general-purpose commercial inspection use
• Minus designation ground 0.0002 inches under nominal for go-gage function
• 0.51-inch nominal diameter for direct bore verification at that size
• Steel construction for durability and resistance to wear during repeated use
• Compact, single-piece pin form for fast manual inspection workflow

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in general-purpose bore and hole inspection applications requiring a 0.51-inch nominal diameter check.

Installation Notes

Pin gages are handled and used by machinists and quality control technicians and require no installation in the traditional sense. Store the gage in a protective case away from other metal tools to prevent damage to the ground surface. Before use, clean both the gage and the bore with a lint-free cloth to remove chips, oil, or debris that could affect the reading. Do not force the gage through a hole; if resistance is encountered, the bore is undersize.