Spi 19-753-3 Class Zz Minus Plug Pin Gage 0.753 in

Product Description

The SPI 19-753-3 is a Class ZZ minus plug pin gage machined from steel and used to verify bore and hole dimensions in precision inspection and quality-control workflows. At 0.753 inches in diameter with a minus tolerance of 0.0002 inches, this gage checks whether a feature is at or above its minimum acceptable size. Class ZZ designates a commercial-grade tolerance class commonly used in production inspection rather than master or reference gage applications. The steel construction provides the rigidity needed for repeatable contact measurements. This gage is a single-piece inspection tool used by machinists, quality technicians, and tool-room professionals in manufacturing environments.

This plug pin gage is suited for verifying drilled, reamed, or bored holes in production parts where a go/no-go decision is required. It is commonly used on shop floors, in inspection departments, and in tool-crib applications where consistent hole-size verification is needed. The 0.753-inch diameter covers a specific bore size in inch-dimensioned workpieces. It is packaged individually and sold in single-unit quantities, making it practical for spot replacement of worn or out-of-tolerance gages in an existing set.

Key Features

• Class ZZ minus tolerance designation for commercial-grade hole inspection
• 0.753-inch nominal diameter for inch-dimensioned bore verification
• Minus tolerance of 0.0002 inches ensures the gage sits within the low end of the tolerance band
• Steel construction for rigidity and wear resistance in production use
• Single-piece packaging supports individual replacement without purchasing a full set

Compatibility

Designed as an OEM-style replacement or standalone inspection tool for use with standard Class ZZ plug gage handles and gage sets sized for 0.753-inch diameter bores in inch-dimensioned workpieces.

Installation Notes

Plug pin gages are handled and used by quality technicians and machinists and do not require power or mechanical installation. Before use, clean both the gage and the workpiece bore to remove chips, coolant, and debris that could affect the measurement. Do not force the gage into a bore; controlled hand pressure is sufficient for a valid reading. Store the gage in a protective case away from other metal tooling to prevent surface damage that could alter the tolerance.