Spi 19-687-3 Class Zz Minus Plug Pin Gage 0.687 in

Product Description

The SPI 19-687-3 is a Class ZZ minus plug pin gage machined from steel, designed to verify bore and hole diameters in precision measurement applications. With a nominal diameter of 0.687 inches and a tolerance of 0.0002 inches, this gage provides reliable go/no-go style dimensional verification for quality control work on the shop floor or in an inspection environment. Class ZZ represents the standard commercial-grade tolerance class for plug gages, making this tool appropriate for general production inspection where close-tolerance measurement is required.

This pin gage is suited for use in manufacturing, machining, and fabrication environments where hole diameter conformance must be verified against a known standard. Inspection technicians and machinists use plug gages like the 19-687-3 during in-process checks and final inspection to confirm that bored, drilled, or reamed features meet dimensional specifications. The minus designation indicates the gage is ground to the lower end of the nominal diameter tolerance, which is standard practice for plug gage applications.

Key Features

• Class ZZ tolerance classification for general commercial inspection use
• Nominal diameter of 0.687 inches with a 0.0002 inch tolerance
• Minus designation ground to the lower tolerance boundary of the nominal size
• Steel construction for durability in shop and inspection environments
• Compact and lightweight at 0.2 pounds for easy single-hand use

Compatibility

Designed as a standard Class ZZ minus plug pin gage for general inspection of 0.687 inch diameter bores and holes in production and quality control settings.

Installation Notes

Plug pin gages are handled and used by inspection technicians and machinists and do not require installation in the traditional sense. Store the gage in a protected case away from moisture and contaminants to prevent corrosion and dimensional changes. Handle with clean, dry hands or cotton gloves to avoid introducing oils that can affect measurement accuracy. Calibrate or verify the gage against certified reference standards at regular intervals per your facility quality plan.