Spi 19-908-3 Class Zz Minus Plug Pin Gage 0.908 in

Product Description

The SPI 19-908-3 is a Class ZZ minus plug pin gage designed for precision bore and hole measurement in machining and quality control applications. It measures at a nominal diameter of 0.908 inches with a minus tolerance of 0.0002 inches, conforming to Class ZZ specifications for go/no-go inspection work. Constructed from steel, this gage provides the hardness and dimensional stability required for repetitive use in production environments. Machinists, quality technicians, and tool room professionals use pin gages like this one to verify that drilled, reamed, or bored holes fall within specified tolerance limits.

This gage is suited for use in manufacturing shops, job shops, and inspection departments where hole size verification is part of standard quality control workflow. It is commonly used to inspect holes in metal, plastic, and composite workpieces where tight dimensional control is required. The Class ZZ tolerance class is appropriate for general-purpose inspection rather than master or reference gage applications. Individual pin gages of this type are often used alongside gage block sets and ring gages as part of a broader dimensional inspection program.

Key Features

• Nominal diameter of 0.908 inches for direct hole inspection at that size
• Class ZZ minus tolerance of 0.0002 inches for general-purpose go/no-go inspection
• Steel construction for durability and dimensional stability under repeated use
• Single-pin format allows targeted measurement without a full set
• Lightweight at 0.2 pounds for easy handheld use at the machine or inspection bench

Compatibility

Designed as an OEM-style replacement or supplemental pin for standard Class ZZ plug gage handle sets used in general-purpose dimensional inspection of 0.908-inch nominal bores.

Installation Notes

Pin gages are handled and used by machinists and quality control technicians — no power source or shutoff is required. Keep the gage clean and lightly oiled when not in use to prevent corrosion and preserve dimensional accuracy. Do not force the pin into a bore; controlled hand pressure is the correct technique to avoid damaging the gage or the workpiece. Store individually or in a designated gage tray to prevent contact damage that could alter the measured diameter.