TB Woods 4JSC35-7/8 Flange

When you are looking for a drop-in replacement or a new build component that handles high-torque demands without the maintenance headaches of lubricated couplings, the TB Woods 4JSC35-7/8 flange is the standard for the trade. This Size 4 high strength cast iron spacer flange is engineered for the Sure-Flex Plus series, offering a 30% increase in torque capacity compared to previous generations. With a precision-machined 7/8" bore and a standard 3/16" x 3/32" keyseat, it provides a secure, interference-fit grip on the shaft, critical for preventing keyway wallow in high-cycle centrifugal pump or HVAC blower applications. The Type SC spacer design is specifically built for easy maintenance; it allows for the removal of the coupling sleeve and the spacer hub without disturbing the drive or driven equipment alignment. This torsionally flexible coupling component excels at absorbing 4-way shock and parallel or angular misalignment, significantly reducing the mechanical stress on your motor bearings and seals.

• Enhanced Torque Capacity: Utilizes high-strength cast iron to support the upgraded Sure-Flex Plus ratings, allowing for potential downsizing of coupling assemblies.
• Spacer Serviceability: Designed for an SC spacer coupling configuration, enabling quick sleeve replacement without decoupling motors or repositioning heavy equipment.
• Standardized Precision: Features a factory-bored 7/8 inch diameter and a single setscrew over the 3/16" x 3/32" keyseat for reliable shaft retention.
• High Speed Stability: Rated for operation up to 7,600 RPM, making it suitable for high-speed industrial fans and high-pressure pumping systems.
• Zero Maintenance Design: Requires no lubrication, eliminating the risk of oil or grease contamination in clean HVACR or food-processing environments.

Common Questions

Is the 4JSC35-7/8 compatible with older Sure-Flex sleeves?
Yes, this Type SC spacer flange is 100% retrofittable. While it is optimized for the increased torque of Sure-Flex Plus EPDM and Neoprene sleeves, it maintains full backward compatibility with existing industry-standard sleeves.

What is the primary difference between the Type SC and Type S flanges?
The Type SC flange is a two-piece design consisting of this spacer flange and a separate spacer hub. This configuration is used when you need to maintain a specific distance between shafts (DBSE) to allow for pump maintenance without moving the motor.

Do I need special tools for alignment with this flange?
No special proprietary tools are required. Because it is a precision-machined flange, you can verify parallel and angular alignment effectively using a standard straightedge and calipers.

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.