Sure-Flex shaft coupling
We stock the full range of Sure-Flex® couplings as well as the full range of EPDM, Neoprene, or Hytrel sleeves.
Sure-Flex® elastomeric shaft couplings rely on a proven element produced from a elastic polymer, to compensate the shaft misalignments but also transmit torque whilst simultaneously dealing with shock, and vibration. EPDM and Neoprene sleeves have excellent dampening properties where as the Hytrel sleeves are for higher torques.
Their 4-way flexing action absorbs virtually all types of shock, misalignment, and end float. With Sure-Flex couplings, the need for lubrication and maintenance is also eliminated. As a result, these couplings provide clean, dependable, and quiet performance for a variety of applications.
- Four-way flexing action absorbs extreme torsional shock and vibration
- Uniquely designed teeth and lateral flexibility accepts both parallel and angular misalignment without wear
- Fast and easy installation without bolts, gaskets, covers or seals
- Lubrication-free design provides quiet, reliable performance
- Flexible sleeves available in EPDM, Neoprene and Hytrel
- Choose from an extensive range of sizes, using BTS, bushed, clamp and spacer flanges
- To suit shaft sizes from 10mm to 140mm, with keyways
The Lubrication-free design provides quiet, reliable performance and does not require bolts, gaskets, covers or seals when installed. The uniquely designed teeth allow lateral flexibility whilst accepting both parallel and angular misalignment without wear.
If you require further technical information, please do not hesitate to contact our sales engineers who will be more than happy to help you with your selection.
Sure-Flex sleeves are available in four materials or compounds and various shape configurations.
| Sleeve Material | EPDM | NEOPRENE | HYTREL | URETHANE |
| Available Sleeve Styles | Style designator | |||
| 1 pc, unsplit | JE | JN | H | U |
| 1 pc, split | JES | JNS | - | - |
| 2 piece | E | N | HS | - |
| Typical Use |
General Purpose |
Oil Resist |
General Purpose |
Stiffness |
| Torsional wind up |
15° | 15° | 7° | 3° |
| Angular Misalignment | 1° | 1° | 1/4° | 1/4° |
| Temperature (C°) | ||||
| Maximum | +135° | +94° | +122° | +94° |
| Minimum | -34° | -17° | -54° | -63° |
Available SURE-FLEX sleeve sizes
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Coupling Ratings (Metric)
| Size | EPDM Sleeves |
Neoprene Sleeves |
KW @ RPM | Torque (Nm) |
Stiffness (Nm/rad) |
Max RPM | |||
| 100 | 970 | 1450 | 3000 | ||||||
| 3 | JE,JES | JN,JNS | 0.07 | 0.69 | 1.03 | 2.13 | 6.8 | 26 | 9200 |
| 4 | E,JE,JES | N,JN,JNS | 0.14 | 1.38 | 2.06 | 4.26 | 13.6 | 52 | 7600 |
| 5 | E,JE,JES | N,JN,JNS | 0.28 | 2.75 | 4.12 | 8.52 | 27.1 | 104 | 7600 |
| 6 | E,JE,JES | N,JN,JNS | 0.53 | 5.16 | 7.72 | 15.97 | 50.8 | 194 | 6000 |
| 7 | E,JE,JES | N,JN,JNS | 0.86 | 8.32 | 12.44 | 25.73 | 82.0 | 313 | 5250 |
| 8 | E,JE,JES | N,JN,JNS | 1.34 | 13.03 | 19.47 | 40.29 | 128.2 | 490 | 4500 |
| 9 | E,JE,JES | N | 2.13 | 20.66 | 30.88 | 63.89 | 203.4 | 777 | 3750 |
| 10 | E,JE,JES | N | 3.40 | 33.00 | 49.32 | 102.05 | 324.8 | 1241 | 3600 |
| 11 | E | N | 5.36 | 51.99 | 77.72 | 160.79 | 511.8 | 1955 | 3600 |
| 12 | E | N | 8.52 | 82.63 | 123.52 | 255.57 | 813.5 | 3107 | 2800 |
| 13 | E | N | 13.43 | 130.26 | 194.72 | 402.87 | 1282.4 | 4898 | 2400 |
| 14 | E | N | 21.30 | 206.58 | 308.81 | 638.92 | 2033.7 | 7768 | 2200 |
| 16 | E | 55.91 | 542.28 | 810.63 | 1677.16 | 5338.5 | 20392 | 1500 | |
| Size | Hytrel Sleeves |
Urethane Sleeves |
KW @ RPM | Torque (Nm) |
Stiffness (Nm/rad) |
Max RPM | |||
| 100 | 970 | 1450 | 3000 | ||||||
| 6 | H,HS | 2.13 | 20.66 | 30.88 | 63.89 | 203.4 | 1130 | 6000 | |
| 7 | H,HS | 3.40 | 33.00 | 49.32 | 102.05 | 324.8 | 2260 | 5250 | |
| 8 | H,HS | 5.36 | 51.99 | 77.72 | 160.79 | 511.8 | 3390 | 4500 | |
| 9 | H,HS | 8.52 | 82.63 | 123.52 | 255.57 | 813.5 | 5367 | 3750 | |
| 10 | H,HS | U | 13.43 | 130.26 | 194.72 | 402.87 | 1282.4 | 11299* | 3600 |
| 11 | H,HS | U | 21.30 | 206.58 | 308.81 | 638.92 | 2033.7 | 14123* | 3600 |
| 12 | H,HS | U | 37.27 | 361.52 | 540.42 | 1118.11 | 3559.0 | 25422* | 2800 |
| 13 | HS | 55.93 | 542.49 | 810.94 | 1677.80 | 5340.6 | 41680 | 2400 | |
| 14 | HS | 85.76 | 831.84 | 1243.48 | 2572.71 | 8189.1 | 67028 | 2200 | |
Flexible sleeves for Sure-Flex couplings are available in four materials (EPDM, Neoprene, Hytrel and Urethane) and in three basic constructions. The various types are shown and described here.
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JE-JES-JN-JNSJ sleeves are molded EPDM rubber (E) or Neoprene (N). They are available in one-piece solid construction (JE, JN) or one-piece split construction (JES, JNS). These sleeves may be used in any Sure-Flex flange within a given size. |
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E-NThese sleeves are of two-piece design with a retaining ring. They are available in either EPDM (E) or Neoprene (N). They may be used with any flange within a given size. Sleeves are shown here assembled and disassembled. |
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H-HS-UH (Hytrel) and U (Urethane) sleeves designed for high-torque applications, transmit four times as much power as an equivalent EPDM or Neoprene sleeve. Available in one-piece solid construction (H or U) or two-piece split construction (HS), these can be used only with S, C, and SC flanges. They cannot be used with J or B flanges or as direct replacements for EPDM or Neoprene sleeves. |
A full range of hubs and flanges are available to suit all the sleeves. Have a look at the on line catalogue for further details.