Spi 29-355-5 Class Zz Plus Plug Gage 0.355 Inch

Product Description

The SPI 29-355-5 is a Class ZZ Plus plug gage designed to verify the dimensional accuracy of machined holes with a nominal diameter of 0.355 inches. Built from steel, this go/no-go style measurement tool provides a tolerance of 0.0002 inches, making it suitable for inspection tasks that require close dimensional control. Plug gages in the Class ZZ Plus designation are widely used in production and quality control environments where hole size conformance must be confirmed quickly and reliably. Machinists, toolroom technicians, and quality inspection personnel use this gage as part of standard in-process and final inspection routines.

This gage is suited for use in manufacturing, machining, and metalworking environments where bore inspection of 0.355-inch diameter holes is required. It is appropriate for both in-process inspection on the shop floor and final quality checks in inspection departments. Its compact form and steel construction make it durable enough for repeated use in production settings. Typical applications include checking drilled, reamed, or otherwise finished holes in ferrous and non-ferrous workpieces.

Key Features

• Class ZZ Plus tolerance grade for production-level hole inspection
• 0.355-inch nominal measurement diameter
• Tolerance of 0.0002 inches for precise dimensional verification
• Steel construction for durability and wear resistance in shop environments
• Single-piece package suitable for individual inspection station use

Compatibility

Designed as a standard Class ZZ Plus plug gage for inspection of machined holes with a 0.355-inch nominal diameter. Confirm tolerance requirements and gage class specifications against your inspection standards before use.

Installation Notes

Plug gages are installed and used by machinists, toolroom technicians, and quality control inspectors following standard metrology practices. Clean both the gage and the workpiece bore before use to avoid false readings caused by chips or debris. Handle with care to prevent drops or impacts that can alter gage geometry. Store in a protected case away from moisture and abrasive contamination to maintain calibration integrity.