TB Woods Sure-Flex couplings

Sure-Flex Plus couplings utilize EPDM, Neoprene, Hytrel™ and Urethane flexible elastomer sleeves to transmit torque and accommodate shaft misalignment. Sure-Flex Plus couplings have exceptional torsional flexibility, with the 4-way flexing action absorbing virtually all types of shock, vibration, misalignment and end float. Sure-Flex Plus couplings are an excellent choice when low cost, high flexibility, low vibration and easy installation are important.

Easy, Quick Installation

Sure-Flex Plus can be installed quickly and easily, thanks to its simple design with no bolts, gaskets, covers or seals. Alignment can be checked on the precision machined flanges using only a straightedge and calipers. No special tools are needed for installation, alignment or removal.

No Lubrication, Trouble-Free Operation

The teeth of the sleeve lock into the teeth of the flanges without clamps or screws, tightening under torque to provide smooth transmission of power. Couplings are not affected by abrasives, dirt or moisture, eliminating the need for lubrication or maintenance and providing clean, dependable, quiet performance.

Sure-Flex Plus couplings last over 3X longer

Fatigue Test to Failure results reveal that Sure-Flex Plus sleeves last over three times as long as the nearest competitive sleeve. See brochure P-7819-TBW.

NEW! Sure-Flex Plus

this industry favorite just got even better. Our new Sure-Flex Plus EPDM and Neoprene sleeves are best-in-class for coupling performance and value. Here’s why:

High Torque Rating

30% Increased Torque Rating
Sure-Flex Plus sleeves provide longer service life in demanding applications, reducing required maintenance and associated replacement cost.

Longer Life

Sure-Flex Plus Lasts Over 3X Longer than the Competition
Extensive testing shows our sleeves outlast the imitators. More uptime means less costly downtime.

Better Value

Save Money Using a Smaller Coupling
Over 50% of common applications can now use a smaller coupling, lowering the cost of both coupling purchase and sleeve replacement.


Retrofits to Existing Flanges
No need to replace the full coupling – the Sure-Flex Plus sleeve design is 100% compatible with the current industry standard created by TB Wood’s over 50 years ago.

Features (Metric)

  • Up to 8.20 kNm; 72,480 in.lbs.
  • Quick and easy installation
  • Spacer, bushed hub and clamping hub designs in stock
  • Flexible design accommodates misalignment and protects equipment
  • 7° to 21° torsional wind up
  • Needs no lubrication, no maintenance


Sure-Flex Plus couplings can be found hard at work in many industries such as power generation and material handling. These couplings are ideal for a wide variety of applications including:

  • Pumps
  • Fans/Blowers
  • Compressors
  • Mixers
  • Electric Motors
  • Conveyors