Spi 19-612-1 Class Zz Minus Plug Pin Gage 0.612 in

Product Description

The SPI 19-612-1 is a Class ZZ minus plug pin gage machined from steel and sized at 0.612 inches in diameter. It is used to verify bore and hole dimensions by checking whether a feature meets minimum size requirements. Class ZZ is the standard tolerance grade for shop-floor go/no-go inspection work, and the minus designation means the gage is ground to the low side of the tolerance. The 19-612-1 carries a tolerance of 0.0002 inches, making it suitable for general-purpose dimensional inspection in production and maintenance environments. Machinists, toolmakers, and quality technicians are the primary users.

This pin gage is used in shop-floor and inspection-room settings wherever bore diameter verification is required. Typical applications include checking drilled, reamed, or punched holes in metal fabrication, machined components, and assembly fixtures. It is appropriate for both production inspection and incoming quality control. The 0.612-inch diameter fits a specific range of bore sizes and is selected when that nominal dimension is the inspection target. It is sold individually and can be added to an existing pin gage set or used as a standalone check gage.

Key Features

• Class ZZ tolerance grade for general shop-floor inspection use
• Minus designation — ground to the low side of the nominal diameter
• 0.0002 inches tolerance for consistent and repeatable measurement
• 0.612 inches nominal diameter for precise bore verification at that size
• Steel construction for durability and wear resistance in production environments

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in general-purpose bore inspection applications requiring a 0.612-inch nominal diameter check.

Installation Notes

Pin gages are handled and used by machinists, toolmakers, and quality control technicians. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain accuracy. Do not force the gage into a bore — if resistance is felt, the bore is undersize or the gage is misaligned. Store separately from other gages to prevent surface damage that could affect dimensional accuracy.