Spi 19-384-7 Class Zz Minus Plug Pin Gage 0.384 in

Product Description

The SPI 19-384-7 is a Class ZZ minus plug pin gage with a 0.384-inch nominal diameter, manufactured from steel for durability and dimensional stability. Designed for go/no-go gauging applications, it checks whether a hole, bore, or internal feature meets its specified tolerance. The minus designation means the gage is ground to the low side of the tolerance band, following standard Class ZZ specifications with a tolerance of 0.0002 inches. Machinists, quality control inspectors, and tool room technicians use this type of gage to verify part acceptance during production and inspection workflows.

This plug pin gage is suited for use in precision machining shops, manufacturing facilities, and inspection departments where internal hole size verification is required. It is appropriate for checking drilled, reamed, or bored holes in metal components where tight dimensional control is critical. The 0.384-inch diameter makes it suitable for medium-small bore inspection tasks commonly encountered in general machining and tool room environments.

Key Features

• Class ZZ tolerance class with minus ground designation for low-side tolerance verification
• 0.384-inch nominal diameter for precise internal bore gauging
• Steel construction for wear resistance and dimensional stability
• 0.0002-inch tolerance for reliable go/no-go inspection
• Single-piece package quantity suitable for individual replacement or kit supplement

Compatibility

Designed as an OEM-style replacement or direct-use plug pin gage for quality inspection setups requiring a Class ZZ minus gage at 0.384-inch diameter in standard steel construction.

Installation Notes

Plug pin gages are handled and used by machinists, quality inspectors, and tool room technicians — no power source or lockout procedure is required. Clean the gage and the bore being checked before use to prevent debris from affecting measurement accuracy. Avoid applying excessive force when inserting the gage into a bore, as forcing can damage the gage or the part. Store the gage in a protective case away from moisture and temperature extremes to maintain calibration integrity.