TB Woods 4J-3/4 Coupler Flange

The TB Woods 4J-3/4 Coupler Flange is a Type J Sure-Flex Plus power transmission component engineered for heavy-duty industrial and HVAC applications. Manufactured from high-strength sintered carbon steel using a powdered metal process, this Size 4 flange provides exceptional dimensional accuracy and uniform material properties. It features a precision 3/4" bore with a standard 3/16" x 3/32" keyseat and a primary setscrew positioned over the keyway for secure shaft attachment. Designed for a slip fit on standard shafts, the 4J34 flange allows for easy installation and precise alignment verification using only a straightedge on its machined outside diameter.

This flange is 100% compatible with Sure-Flex Plus EPDM and Neoprene sleeves, offering a 4-way flexing action that effectively absorbs parallel misalignment, angular misalignment, and end float. The 4J34 is rated for a maximum speed of 7600 RPM and can handle a torque capacity of up to 120 in-lbs, making it ideal for close-coupled pump and motor assemblies where vibration damping is critical. Use this component to replace worn 4J flanges without the need for specialized tools or lubrication.

• Enhanced Torque Capacity: Precision-milled teeth lock with elastomeric sleeves to provide smooth power transmission without metal-to-metal contact.
• Durable Construction: The sintered steel material maintains high strength and structural integrity under demanding load cycles.
• Vibration Damping: When paired with the correct Sure-Flex sleeve, it isolates torsional shock to protect bearings and sensitive HVAC equipment.
• Simple Maintenance: The non-lubricated design eliminates the frequent service intervals required by grid or gear-style couplings.

• Is the 4J-3/4 flange compatible with Hytrel sleeves? No, Type J flanges are specifically designed for EPDM and Neoprene sleeves and should not be used with Hytrel inserts.
• Does this flange come with the key? This is a bored-to-size flange with a standard keyway; the shaft key is typically provided by the technician during installation.
• How do I check alignment on this coupling? Because the flange faces and OD are precision-machined, you can verify alignment using standard calipers or a straightedge across the coupling halves.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.