Spi 19-458-9 Class Zz Minus Plug Pin Gage 0.458 in

Product Description

The SPI 19-458-9 is a Class ZZ minus plug pin gage ground to a nominal diameter of 0.458 inches with a minus tolerance of 0.0002 inches. Plug pin gages are precision measuring tools used to verify hole diameters and bore tolerances in machined parts. This gage is constructed from steel for durability and dimensional stability under shop conditions. Class ZZ designates the tolerance grade appropriate for general-purpose inspection and production floor use. Machinists, quality control technicians, and tool-and-die tradespeople use pin gages like this one to confirm that a drilled or reamed hole falls within an acceptable size range before assembly.

This pin gage is suited for incoming inspection, in-process quality checks, and final inspection tasks where a 0.458-inch nominal bore must be verified. It is commonly used in metal fabrication shops, machine shops, and manufacturing facilities that work with close-tolerance components. The minus tolerance grind means the gage body measures slightly under nominal, which is the standard configuration for go-gage applications where the gage must pass through an acceptable hole.

Key Features

• Nominal diameter of 0.458 inches for direct bore verification at that size
• Class ZZ tolerance grade for general-purpose production and inspection use
• Minus tolerance grind of 0.0002 inches provides a go-gage style fit
• Steel construction for shop-floor durability and long service life
• Single-piece design with no adjustable components to go out of calibration

Compatibility

Designed as a general-purpose plug pin gage for any inspection or production application requiring verification of a 0.458-inch nominal diameter bore.

Installation Notes

Pin gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Before use, verify the gage surface is free of burrs, debris, or damage that could affect measurement accuracy. Store in a protective case away from other tooling to prevent nicks on the ground surface. Periodic recalibration against a certified reference standard is recommended to maintain measurement traceability.