Chicago Pneumatic 8941091200 Air Angle Grinder 4 Inch

Product Description

The CHICAGO PNEUMATIC 8941091200 is a pneumatic angle grinder built for metalworking, fabrication, and surface preparation tasks in industrial and trade environments. It accepts a 4-inch grinding wheel and spins at up to 12,000 RPM, driven by a compressed air supply at 90 psi. Air consumption runs at 23.3 CFM through a 1/4-inch NPT inlet, with exhaust directed out the front of the tool to keep debris away from the operator. The helical bevel gear design supports smooth power transfer, and the overall length of 9.3 inches gives technicians solid control during extended use. Licensed trades and industrial mechanics are the primary installers and operators.

This grinder is suited for grinding, deburring, and blending operations on metal in both shop and field settings. The ergonomic aluminum alloy side handle and trigger-lock feature reduce operator fatigue during continuous work. The keyless adjustable protective guard allows quick wheel-position changes without additional tools, making it practical in production environments where downtime matters. It is appropriate for use on fabrication benches, maintenance applications, and structural metalwork where a compact 4-inch pneumatic tool is the right fit.

Key Features

• 4-inch wheel diameter at 12,000 RPM free speed
• Helical bevel gear design for smooth, efficient power transfer
• Keyless adjustable protective guard for fast wheel-position changes
• Ergonomic aluminum alloy side handle reduces operator fatigue
• Trigger-lock for sustained grinding without constant grip pressure
• Front exhaust directs air and debris away from the work surface and operator

Compatibility

Designed for use with standard 4-inch grinding wheels and abrasive discs fitted to a 3/8-24 spindle. Requires a compressed air supply capable of delivering at least 23.3 CFM at 90 psi through a 1/4-inch NPT connection.

Installation Notes

Installation and operation should be performed by qualified personnel familiar with pneumatic tool safety. Before mounting or changing a wheel, disconnect the air supply completely and verify the line is depressurized. Ensure the air system is equipped with a filter-regulator-lubricator unit to protect internal components and maintain rated performance. Always confirm the abrasive wheel speed rating meets or exceeds the tool free speed before mounting, per applicable ANSI and OSHA abrasive wheel standards.