Spi 29-247-4 Class Zz Plus Plug Gage 0.247 in

Product Description

The SPI 29-247-4 is a Class ZZ Plus plug gage designed to verify bore and hole diameters with a nominal measurement diameter of 0.247 inches and a tolerance of 0.0002 inches. Constructed from steel, this go/no-go style gage provides the dimensional accuracy required for production inspection, incoming quality control, and machine-shop floor verification. It is used by machinists, quality technicians, and tool-room professionals who need reliable, repeatable measurement of small-diameter bores in manufactured components.

This plug gage is suited for applications in precision machining environments where tight hole tolerances must be confirmed before assembly. Typical use cases include checking drilled, reamed, or bored holes in metal parts on production lines or in job-shop settings. The Class ZZ Plus designation indicates a commercially standard tolerance grade appropriate for general-purpose inspection of work-piece features that do not require master-gage-level accuracy.

Key Features

• Nominal measurement diameter of 0.247 inches for direct bore verification
• Class ZZ Plus tolerance grade suited for general-purpose production inspection
• 0.0002-inch tolerance provides consistent, repeatable go/no-go checking
• Steel construction for durability in machine-shop and inspection environments
• Compact, lightweight form factor at 0.2 pounds for easy bench or floor use

Compatibility

Designed as a general-purpose Class ZZ Plus plug gage for verifying 0.247-inch nominal diameter bores in machined metal components across standard production inspection applications.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians; no power source or electrical lockout is required. Keep the gage clean and lightly oiled when not in use to prevent corrosion and preserve accuracy. Do not force the gage through an undersized bore, as this can damage the gage surface and compromise measurement integrity. Store the gage in its case away from temperature extremes to maintain dimensional stability.