Jet 505402 Extended Die Grinder 1/4 Inch Air Inlet

Product Description

The JET 505402 is a pneumatic extended die grinder designed for demanding trade and industrial applications. Part of the R6 Series, it is built for sustained use in heavy-duty environments, with full-size aluminum construction that keeps weight low without sacrificing durability. The extended body provides additional reach in confined or deep workspaces. A built-in air regulator gives operators precise speed control, and the variable-speed throttle ramps smoothly up to maximum RPM. This grinder is rated for performance at 90 psi and accepts a 1/4 inch NPT air inlet with a minimum 3/8 inch hose size.

The JET 505402 is suited for metalworking, fabrication, and maintenance applications where standard-length die grinders cannot reach. The extended design is particularly useful for porting, grinding, and deburring in recessed areas on machinery, engine components, or structural steel. It is installed and operated by machinists, millwrights, pipefitters, and general industrial maintenance technicians. The R6 Series is rated for workdays up to 6 hours of continuous use, making it appropriate for production-floor environments.

Key Features

• Extended die grinder body provides additional reach in confined or deep work areas
• Full-size lightweight aluminum construction reduces operator fatigue during extended use
• Sealed ball bearing design resists contaminant ingress and supports smooth operation
• Safety throttle lock prevents accidental engagement during positioning or tool changes
• Variable-speed throttle with built-in air regulator for precise RPM control
• Rear-facing exhaust directs air away from the work surface and operator
• Rated for up to 6 hours of daily operation in rigorous applications

Compatibility

Designed as an OEM-style replacement or direct-use pneumatic die grinder compatible with standard 1/4 inch NPT air supply lines and 3/8 inch minimum diameter air hoses used in industrial and trade shop setups.

Installation Notes

Installation and operation of pneumatic die grinders should be performed by qualified trades personnel familiar with compressed air systems. Verify the air supply is depressurized before connecting or disconnecting the tool. Ensure the air line meets the 3/8 inch minimum hose size requirement and that supply pressure is regulated to 90 psi for rated performance. Follow applicable OSHA and shop safety standards for abrasive wheel and rotary tool use, including use of appropriate PPE.

Technical Specifications

• Operating Pressure: 90 psi
• Air Inlet Size: 1/4 inch NPT
• Minimum Hose Size: 3/8 inch
• Body Material: Aluminum
• Bearing Type: Sealed ball bearing
• Exhaust Direction: Rear-facing

Standard Information

• Brand: JET
• Manufacturer Part Number: 505402