Spi 19-645-1 Class Zz Minus Plug Pin Gage 0.645 in

Product Description

The SPI 19-645-1 is a Class ZZ minus plug pin gage with a 0.645-inch nominal diameter, designed for go/no-go dimensional inspection of bored holes, drilled passages, and machined features. Built from steel, this gage provides a tolerance of 0.0002 inches in the minus direction, meaning the gage is manufactured below nominal to function as a minus-tolerance reference. Machinists, quality technicians, and tool-and-die professionals use plug gages like this to verify that a hole or bore falls within an acceptable size range without the need for complex measurement instruments.

This gage is suited for use in machine shops, manufacturing floors, and inspection departments handling close-tolerance work. A 0.645-inch minus plug gage is commonly applied when inspecting holes machined to fit standard shaft or pin diameters. It is appropriate for both production inspection and incoming quality control tasks where consistent, repeatable dimensional verification is required on steel, aluminum, or other machinable workpiece materials.

Key Features

• 0.645-inch nominal diameter for direct hole-size verification
• Class ZZ tolerance grade for general-purpose inspection applications
• Minus tolerance of 0.0002 inches for accurate lower-bound dimensional checking
• Steel construction for durability and wear resistance in production environments
• Compact, single-piece design for handheld use at the point of inspection

Compatibility

Designed as a general-purpose Class ZZ minus plug gage for verifying 0.645-inch diameter holes in machined components across a wide range of manufacturing and inspection applications.

Installation Notes

Plug pin gages are handled and used by quality control technicians and machinists. Before use, clean the gage and the hole being inspected to remove chips, coolant, and debris that could affect the measurement. Apply light gage oil when inserting the gage to prevent galling and premature wear. Do not force the gage into an undersized hole, as this can damage the gage surface and compromise its accuracy.