Spi 30-394-1 Protractor Half Round Head 6 Inch Blade

Product Description

The SPI 30-394-1 is a half-round head protractor with a 6 inch blade, designed for precise angle measurement in trade and industrial applications. The dial reads 0 to 90 to 0 degrees with 1-degree graduations and an accuracy of 5 minutes of arc, making it suitable for layout, fabrication, and inspection work. The maximum measurable angle is 180 degrees. Technicians and tradespeople across HVAC, sheet metal, plumbing, and general mechanical service use this tool when accurate angular measurement is required for cutting, fitting, or alignment tasks.

This protractor is a hand tool suited for both shop and field use. Its half-round head design provides a stable reference surface for reading angles on ductwork, pipe, structural members, and fabricated components. The 6 inch blade length gives enough reach for common layout tasks without becoming unwieldy. Typical users include sheet metal fabricators, HVAC installers, pipefitters, and maintenance technicians who need a reliable, readable angle tool in their kit.

Key Features

• 6 inch blade length for layout and measurement reach
• Half-round head design provides stable angular reference
• 180-degree maximum measurement range
• 1-degree dial graduation for clear, readable increments
• 5-minute accuracy for precise angular work
• Dial range reads 0 to 90 to 0, covering both directions from center

Compatibility

Designed as a general-purpose hand protractor for trade and industrial angle measurement applications where a half-round head style and 6 inch blade are appropriate.

Installation Notes

No installation is required for this hand measurement tool. Keep the blade and dial face clean and free of debris to maintain reading accuracy. Store the protractor in a protective case or tool pouch to prevent damage to the blade and dial. Calibration should be verified periodically against a known reference angle if the tool is used for precision quality inspection work.