Spi 19-661-8 Class Zz Minus Plug Pin Gage 0.661 in

Product Description

The SPI 19-661-8 is a Class ZZ minus plug pin gage machined from steel, designed to verify that a hole or bore meets its minimum acceptable size. The gage measures 0.661 inches in diameter and carries a tolerance of 0.000200 inches, providing reliable go/no-go inspection capability for precision machining and quality control work. Class ZZ gages follow standard industry tolerance grades for general-purpose inspection. At 0.2 pounds, this is a compact, hand-held tool suited for shop-floor and inspection-room use by machinists, toolmakers, and quality technicians.

This plug pin gage is used in manufacturing, machining, and fabrication environments where bore diameter verification is required. It is suited for inspecting drilled, reamed, or bored holes in metal, plastic, or composite workpieces. The minus designation means the gage is ground to the lower limit of the nominal diameter, making it appropriate for confirming that a hole is no smaller than the specified minimum dimension. Typical applications include production line inspection, incoming material checks, and first-article verification.

Key Features

• 0.661 inch nominal diameter for precise bore measurement
• Class ZZ tolerance grade suitable for general-purpose inspection
• Minus plug designation verifies minimum acceptable hole size
• 0.000200 inch tolerance for consistent, repeatable measurement
• Steel construction for durability in shop-floor environments
• Lightweight at 0.2 pounds for easy single-hand operation

Compatibility

Designed as a standard Class ZZ minus plug pin gage for general-purpose bore inspection in machining and manufacturing applications where a 0.661 inch nominal diameter check is required.

Installation Notes

Plug pin gages are handled and used by machinists, toolmakers, and quality control inspectors — no installation in the traditional sense applies. Store the gage in its case or protective holder when not in use to prevent damage to the ground surface. Clean the gage and the bore being measured before use to avoid false readings caused by chips or debris. Periodically verify the gage against a calibrated master reference to confirm it remains within tolerance.