Spi 19-274-0 Class Zz Minus Plug Pin Gage 0.274 in

Product Description

The SPI 19-274-0 is a Class ZZ minus plug pin gage with a 0.274-inch nominal diameter, manufactured from steel for durability in precision measurement applications. Class ZZ is the standard tolerance class for go/no-go inspection gaging in general industrial and shop-floor use. This gage carries a minus tolerance of 0.0002 inches, meaning the actual diameter is ground slightly under nominal to function as a go or no-go member in a two-piece gage set. Machinists, quality control technicians, and tool-room professionals use plug pin gages to verify bore and hole diameters to tight tolerances during production and incoming inspection.

This plug pin gage is suited for verifying hole and bore dimensions on machined parts, castings, and fabricated components in manufacturing, metalworking, and tool-and-die environments. It is appropriate for use with standard gage handles and gage handle sets designed to accept pin-style gages of this diameter class. The 0.274-inch size falls within a common range for drilled and reamed holes used in mechanical assemblies and fixture work.

Key Features

• Class ZZ tolerance class for general-purpose go/no-go plug gaging
• Minus tolerance ground to 0.0002 inches under nominal diameter
• 0.274-inch nominal diameter for precise bore verification
• Steel construction for wear resistance in shop-floor conditions
• Compatible with standard pin gage handles for convenient use

Compatibility

Designed for use with standard plug gage handles that accept pin gages in the 0.274-inch diameter range. No specific model or system compatibility data was provided in the product information.

Installation Notes

Plug pin gages should be handled and stored carefully to avoid nicks, burrs, or surface damage that can affect measurement accuracy. Clean the gage and the workpiece bore before use to remove chips, coolant, or debris that could cause false readings. Do not force the gage into a bore; insert with light hand pressure only. Calibration and periodic comparison against a certified master gage or gage block set is recommended to confirm dimensional accuracy over time.