Spi 19-228-6 Class Zz Minus Plug Pin Gage 0.228 in

Product Description

The SPI 19-228-6 is a Class ZZ minus plug pin gage used to verify hole diameters and internal bore dimensions in precision machining and inspection work. This gage measures a nominal diameter of 0.228 inches and is manufactured from steel to resist wear during repeated use. The minus designation means the gage is ground to the low side of the nominal dimension, following standard GO gage practice. Machinists, quality control technicians, and toolroom personnel use plug pin gages like this one to confirm that drilled, reamed, or bored holes fall within acceptable tolerance limits before parts move to the next stage of production.

This gage is suited for dimensional inspection tasks in machine shops, toolrooms, and manufacturing quality control environments. It fits applications where a 0.228-inch nominal bore must be checked against a specified tolerance. The 0.0002-inch tolerance class makes it appropriate for moderate-precision inspection work consistent with Class ZZ gage standards. It is typically used as part of a GO/NO-GO gage set or as a standalone check gage for incoming or in-process inspection.

Key Features

• 0.228-inch nominal diameter for direct bore verification at that dimension
• Class ZZ tolerance grade with 0.0002-inch tolerance for standard inspection work
• Minus designation ground to the low side of nominal per standard plug gage convention
• Steel construction provides durability and wear resistance during repeated use
• Compact, single-piece design compatible with standard pin gage handles and holders

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in GO/NO-GO gage sets or as a standalone inspection gage for 0.228-inch nominal diameter bores.

Installation Notes

Plug pin gages are handled and used by qualified inspection or machining personnel following standard gage calibration and handling procedures. Store the gage in a protected case or holder to prevent surface damage that would affect accuracy. Clean both the gage and the bore being checked before use to avoid false readings from debris or coolant residue. Gages should be periodically recalibrated against traceable standards to maintain measurement reliability.