Spi 19-734-3 Class Zz Minus Plug Pin Gage 0.734 in

Product Description

The SPI 19-734-3 is a Class ZZ minus plug pin gage machined from steel and used to inspect and verify the diameter of bored holes, drilled passages, and precision-machined features. Rated at a 0.000200-inch tolerance, this minus-type gage is designed to check minimum material conditions, confirming that a hole falls within its lower acceptable limit. At 0.734 inches in diameter, it fits standard inspection workflows in precision machining, tool and die, quality control, and general metrology applications. Weighing 0.2 pounds, it is lightweight and easy to handle during repeated gauging cycles.

This gage is suited for use in machine shops, manufacturing facilities, and quality inspection departments where consistent hole-size verification is required. A minus-style plug gage checks that a hole is not undersized, making it a go-type reference in typical go/no-go gage pairing setups. It is appropriate for both production-floor spot checks and dedicated inspection station use by machinists, quality technicians, and metrologists working to tight dimensional tolerances.

Key Features

• Class ZZ tolerance class — suitable for reference, inspection, and setting applications
• Minus tolerance designation for checking minimum material condition of bored or drilled holes
• 0.000200-inch tolerance provides repeatable, traceable dimensional verification
• 0.734-inch diameter covers a common production bore size
• Steel construction for durability and dimensional stability under normal shop conditions

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in go/no-go gage sets and general hole-inspection applications requiring a 0.734-inch nominal diameter reference.

Installation Notes

Plug pin gages are handled and applied by machinists and quality technicians and do not require power tools or mechanical installation. Clean the gage and the bore being checked before use to prevent debris from affecting readings. Store the gage in its protective case when not in use to prevent surface damage and avoid dropping, which can alter the calibrated tolerance. Periodic recalibration against certified reference standards is recommended to maintain traceability.