Spi 29-304-3 Class Zz Plus Plug Gage 0.304 in Dia

Product Description

The SPI 29-304-3 is a Class ZZ Plus plug gage designed for precision inspection of 0.304-inch diameter holes and bores. Manufactured from steel, it provides machinists, quality control technicians, and tool-room professionals with a reliable go/no-go reference for verifying bore dimensions to a tolerance of 0.0002 inches. Class ZZ Plus gages meet widely recognized industry standards for inspection-grade tooling and are suited for incoming inspection, production floor checking, and quality audits where dimensional accuracy is critical.

This plug gage is used in metalworking and manufacturing environments where consistent bore verification is required. It is appropriate for single-piece or low-volume inspection work and fits standard gage handle configurations common in shop environments. The 0.304-inch nominal size makes it a practical choice for checking drilled, reamed, or bored holes in ferrous and non-ferrous workpieces across light industrial and precision machining applications.

Key Features

• Class ZZ Plus tolerance rating for inspection-grade dimensional verification
• 0.304-inch nominal measurement diameter for precise bore checking
• 0.0002-inch tolerance for tight dimensional control
• Steel construction for durability and wear resistance
• Compact and lightweight at 0.2 pounds for easy handling

Compatibility

Designed as a standard plug gage replacement or addition for inspection setups requiring a 0.304-inch Class ZZ Plus gage member; fits standard plug gage handles compatible with this nominal size range.

Installation Notes

Plug gages should be handled and stored carefully to prevent nicks, burrs, or surface contamination that can affect accuracy. Clean the gage and the bore being inspected before use to remove chips, oil, and debris. Do not force the gage into a bore; apply light, controlled hand pressure only. Periodic recalibration against certified masters is recommended to maintain traceability in quality-controlled environments.