Dynabrade 54771 Air Angle Grinder 4 Inch 12000 Rpm

Product Description

The DYNABRADE 54771 is a pneumatic angle grinder built for demanding metalworking and fabrication applications. It accepts a 4-inch Type 27 grinding wheel and runs at 12,000 RPM, driven by a 0.70 HP air motor requiring a 1/4-inch NPT air inlet at 90 psi and 40 CFM. The tool features a rear exhaust design to direct airflow away from the work surface and operator. At 2.9 pounds and 8 inches in overall length, the 54771 is compact enough for tight work areas while delivering the power needed for weld grinding, surface prep, and material removal tasks common in industrial and shop environments.

This angle grinder is suited for use in metal fabrication shops, maintenance and repair operations, and production environments where consistent pneumatic tooling is standard. The composite side handle and trigger-lock feature support extended-duration use by reducing operator fatigue. The adjustable wheel guard and aluminum right angle head are included, making this unit ready for use out of the box. Licensed trades and skilled metalworkers who rely on pneumatic grinders for daily production or heavy-duty finishing work will find the 54771 a direct fit for those workflows.

Key Features

• 12,000 RPM free speed with 0.70 HP air motor for consistent stock removal
• 4-inch Type 27 wheel compatibility for weld grinding and surface preparation
• Rear exhaust routes air away from operator and work surface
• Composite side handle with trigger-lock for reduced fatigue during extended use
• Adjustable wheel guard, aluminum right angle head, and side handle included
• Compact 8-inch overall length and 2.9-pound weight for access in tight spaces

Compatibility

Designed for use with 4-inch Type 27 grinding wheels on a 3/8-24 spindle. Requires a compressed air supply capable of maintaining 90 psi and 40 CFM at a 1/4-inch NPT inlet connection.

Installation Notes

Installation and operation should be performed by qualified personnel familiar with pneumatic tooling and applicable shop safety standards. Before mounting or changing a wheel, disconnect the air supply and verify the line is fully depressurized. Confirm the air supply delivers clean, dry air at the rated pressure and flow to maintain tool performance and extend service life. Always inspect the wheel guard and grinding disc for damage before operation.