Spi 19-189-0 Class Zz Minus Plug Pin Gage 0.189 in

Product Description

The SPI 19-189-0 is a Class ZZ minus plug pin gage machined to a 0.189-inch nominal diameter with a tolerance of 0.0002 inches. Plug pin gages are precision hand tools used to verify that a drilled, reamed, or bored hole meets a specified diameter tolerance. The minus designation means the gage is ground to the lower boundary of the tolerance range, making it suitable for go/no-go inspection workflows where confirming the minimum acceptable hole size is required. Constructed from steel, this gage is built to hold its geometry through repeated use in shop-floor and inspection environments.

This gage is used in machine shops, manufacturing facilities, and quality control departments where tight hole tolerances must be verified quickly and consistently. It is appropriate for checking holes in metal, plastic, or composite workpieces. Inspectors, machinists, and tool-and-die technicians reach for plug gages when calibrated verification of a bore diameter is needed without relying on a bore micrometer or other measuring instrument. The 0.189-inch size fits applications common in precision-machined components, fastener hole inspection, and fixture verification.

Key Features

• Class ZZ tolerance classification for standard shop-use go/no-go inspection
• Minus designation ground to the lower limit of the nominal diameter range
• 0.189-inch nominal diameter suits a range of precision hole inspection tasks
• 0.0002-inch tolerance for reliable dimensional verification
• Steel construction provides durability and dimensional stability under normal handling

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with any go/no-go gage handle or pin gage set holder accepting 0.189-inch diameter pins.

Installation Notes

Plug pin gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Always clean and deburr the hole to be checked before inserting the gage to avoid damaging the ground surface. Store the gage in its case or a protective sleeve when not in use to maintain calibration. Periodic re-calibration against a certified master is recommended per your facility quality plan.