Spi 19-875-4 Class Zz Minus Plug Pin Gage 0.875 in

Product Description

The SPI 19-875-4 is a Class ZZ minus plug pin gage machined from steel and used to verify hole diameters in precision inspection and quality control work. It checks a 0.875 inch nominal diameter with a minus tolerance of 0.0002 inches, confirming that a bore or hole meets minimum size requirements. Class ZZ gages are the standard for general-purpose shop-floor inspection. Machinists, toolmakers, and quality technicians use plug gages like this one to quickly pass or reject drilled, reamed, or bored holes without complex measurement setups.

This gage is suited for use in machine shops, manufacturing cells, and inspection departments handling general-purpose dimensional verification. A minus plug gage checks that a hole is at or above the minimum acceptable diameter, making it useful for go-gage applications where undersized bores need to be identified before assembly. It works with standard gage blocks and holders and is appropriate for both production-floor checks and incoming inspection of machined components.

Key Features

• Class ZZ tolerance grade for general-purpose shop and production inspection
• Minus designation confirms minimum bore diameter acceptance
• 0.875 inch nominal diameter for direct hole verification
• 0.0002 inch tolerance for reliable dimensional control
• Steel construction for durability and wear resistance in shop environments

Compatibility

Designed as a general-purpose Class ZZ minus plug gage for verifying 0.875 inch nominal diameter holes in machined components across standard shop and inspection applications.

Installation Notes

Plug pin gages are handled by machinists and quality inspection personnel. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain accuracy. Do not force the gage into a hole; if resistance is felt, the bore may be undersized and should be measured with calibrated instruments before further work. Store in a protective case away from temperature extremes to preserve dimensional stability.