TB Woods 7H Coupler Insert

As a seasoned technician, you know that high-torque demands require a coupling insert that doesn’t forfeit durability for flexibility. The TB Woods 7H is a single piece Hytrel solid sleeve insert engineered specifically for size 7 Sure-Flex Plus Couplers. Unlike standard EPDM or Neoprene sleeves, Hytrel is a heavy-duty thermoplastic elastomer designed to transmit up to four times the power, making it the industry standard for high-torque HVACR applications. This orange-coded sleeve handles a rated torque of 2,875 in-lbs and operates reliably within a wide temperature range of -65°F to +250°F. The 1-piece solid construction is built to minimize maintenance by eliminating the need for lubrication while providing 4-way flexing action to absorb parallel misalignment up to 0.012 inches and angular gaps. When your system relies on power transmission for pumps, compressors, or blowers, this 7H Sure-Flex sleeve provides the torsional stiffness required to protect your drivetrain under load.

• High Torque Capacity: Transmits 4x the horsepower of standard flexible sleeves, ideal for industrial-grade motor shafts.
• Chemical & Temperature Resilience: The Hytrel material provides superior resistance to hydrocarbons and extreme thermal conditions.
• Maintenance-Free Design: No lubrication or internal maintenance is required, reducing downtime for your clients.
• Precision Compatibility: Designed exclusively for use with S, C, and SC flanges; ensures a secure, slip-free fit for size 7 assemblies.
• Shock Absorption: Dampens torsional vibrations and handles up to 0.25 degrees of angular misalignment to protect bearings.

Can I use a 7H Hytrel sleeve with J or B type flanges?
No. The TB Woods 7H coupler insert is only compatible with Type S, C, or SC flanges. Using them with J or B flanges will lead to premature failure and is not recommended in the field.

How does Hytrel compare to EPDM in terms of flexibility?
Hytrel is significantly stiffer than EPDM. While EPDM sleeves wind up approximately 21° at rated torque, the Hytrel 7H sleeve only winds up about 7°, offering the higher torsional stiffness needed for high-load cycles.

Is the 7H sleeve a direct replacement for an EPDM sleeve in my current coupling?
Only if you are using the correct flange types. Because Hytrel transmits much higher torque, you must ensure the rest of your Sure-Flex Plus coupling components are rated for the increased power throughput.

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.