Dynabrade 54775 Air Angle Grinder 4 Inch 13500 Rpm

Product Description

The DYNABRADE 54775 is a pneumatic angle grinder designed for grinding, cutting, and surface preparation tasks in industrial and trade environments. It accepts a 4-inch wheel and runs at 13,500 RPM, powered by a 90 psi air supply consuming 40 CFM at peak load. The 3/8-24 spindle provides a standard thread for a broad range of abrasive accessories. A trigger-lock mechanism allows sustained operation during extended work cycles. Weighing 2.9 pounds, this tool is well-suited for overhead and confined-space applications where reducing operator fatigue matters. It is installed and serviced by industrial maintenance technicians, fabricators, and mechanical contractors.

The 54775 fits into general industrial fabrication, weld dressing, deburring, and surface blending operations. The rear exhaust configuration directs spent air away from the workpiece and operator, which is a practical advantage in close-tolerance grinding and in environments where debris control is a priority. The 1/4-inch NPT air inlet is compatible with standard shop-air fittings and quick-connect systems common in production and field-service settings. This grinder is appropriate for both fixed shop installations and portable service work wherever a reliable compressed-air supply is available.

Key Features

• 4-inch wheel diameter accommodates standard depressed-center and Type 27 grinding wheels
• 13,500 RPM free speed for aggressive material removal
• 0.70 HP pneumatic motor operates at 90 psi supply pressure
• 3/8-24 spindle thread matches a wide range of abrasive wheel arbors
• Rear exhaust directs air away from the work surface and operator
• Trigger-lock feature supports sustained operation without continuous grip pressure

Compatibility

Designed as an OEM pneumatic angle grinder for use with 4-inch abrasive wheels mounted on a 3/8-24 spindle thread, compatible with standard 1/4-inch NPT shop-air supply lines and fittings.

Installation Notes

Installation and operation should be performed by qualified personnel familiar with pneumatic tool safety and applicable OSHA standards for abrasive wheel machinery. Always depressurize and disconnect the air supply before mounting or changing wheels, and inspect wheels for cracks or damage before each use. Verify that the air supply pressure does not exceed 90 psi and that the line delivers adequate volume to sustain 40 CFM during operation. Ensure all wheel guards are in place and that the spindle nut is properly torqued per the wheel manufacturer's instructions before starting the tool.