Dynabrade 54787 Air Angle Grinder 4 Inch 12000 Rpm

Product Description

The DYNABRADE 54787 is a pneumatic angle grinder built for grinding, blending, and surface preparation work in industrial and fabrication environments. It accepts a 4-inch grinding wheel and runs at 12,000 RPM, delivering 0.70 HP through a 3/8-24 spindle. Air supply connects through a 1/4-inch NPT inlet and the tool requires 40 CFM at 90 psi for rated performance. The rear exhaust directs spent air away from the work surface, reducing debris blown back toward the operator. A trigger-lock mechanism allows sustained operation without constant grip pressure. Licensed tradespeople and production floor technicians typically install and maintain this class of tool.

The 54787 is suited for metal fabrication shops, weld finishing, automotive bodywork, and general industrial maintenance applications where a compact right-angle grinder is required. At 11.5 inches long and 3.7 pounds, it is sized for single-hand control during extended grinding passes. The 4-inch wheel diameter makes it appropriate for tight clearance work where a larger grinder would not fit. This tool is intended for professional use in environments with a regulated compressed-air supply capable of sustaining the required flow rate.

Key Features

• 4-inch wheel diameter capacity for compact grinding and blending tasks
• 12,000 RPM free speed delivers aggressive material removal
• 0.70 HP pneumatic motor operates on standard shop air at 90 psi
• Rear exhaust routes airflow away from the operator and workpiece
• Trigger-lock engages for sustained operation without continuous hand pressure
• 1/4-inch NPT air inlet compatible with standard shop-air fittings

Compatibility

Designed for use with 4-inch grinding wheels threaded to a 3/8-24 spindle. Requires a compressed-air source capable of supplying 40 CFM at 90 psi through a 1/4-inch NPT connection.

Installation Notes

Installation and wheel changes should be performed by qualified personnel following ANSI B11 and applicable OSHA standards for abrasive wheel tools. Always depressurize the air line and disconnect the tool from the air supply before mounting or removing a grinding wheel. Verify that the wheel's rated RPM meets or exceeds the tool's 12,000 RPM free speed before use. Inspect the wheel for cracks or damage prior to each use and use the correct wheel guard per the manufacturer's instructions.