Spi 19-227-8 Class Zz Minus Plug Pin Gage 0.227 in

Product Description

The SPI 19-227-8 is a Class ZZ minus plug pin gage manufactured from steel, designed to check the dimensional accuracy of holes and bores in precision machining and inspection applications. With a nominal diameter of 0.227 inches and a tolerance of 0.0002 inches (0.0002 mm), this gage provides reliable go/no-go verification at the shop floor or inspection bench. Class ZZ is the standard tolerance grade for general-purpose plug gages, making this tool appropriate for production inspection where tight process control is required. Machinists, quality technicians, and tool room personnel are the primary users.

This pin gage is suited for use in manufacturing environments where hole diameter verification is part of a routine inspection process. It is commonly used alongside gage blocks and other precision measuring instruments in quality assurance workflows. The 0.227-inch diameter targets a specific bore size frequently encountered in precision mechanical assemblies. Its compact, hand-held form factor allows use in both bench inspection and in-process checks on the production floor.

Key Features

• Nominal diameter of 0.227 inches for precise bore verification
• Class ZZ tolerance grade at 0.0002 inches for general-purpose inspection
• Steel construction for durability and dimensional stability
• Minus designation indicates the gage is ground to the lower end of the tolerance band
• Compact form factor suitable for bench or in-process inspection

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for use in standard go/no-go inspection of holes and bores with a nominal diameter of 0.227 inches.

Installation Notes

Plug pin gages are handled and used by quality technicians and machinists; no power tools or utilities need to be shut down for gage use, but always ensure the workpiece is secured and free of chips or coolant before gauging. Handle with clean, dry hands or cotton inspection gloves to prevent corrosion from skin oils. Store in a protective case away from temperature extremes to maintain calibration integrity. Periodic recalibration against a traceable standard is recommended per ASME B89 guidelines.