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 shaft coupling Image

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
Non-flame

General
Purpose
Stiffness

       
Torsional wind up
15° 15°
Angular Misalignment 1/4° 1/4°
Temperature (C°)  
Maximum +135° +94° +122° +94°
Minimum -34° -17° -54° -63°

Available SURE-FLEX sleeve sizes

Product No. Product Description

3J 3JE EPDM
4J 4JE EPDM
5J 5JE EPDM
6J 6JE EPDM
7J 7JE EPDM
8J 8JE EPDM
9J 9JE EPDM
10J 10JE EPDM

3JS 3JES EPDM Split
4JS 4JES EPDM Split
5JS 5JES EPDM Split
6JS 6JES EPDM Split
7JS 7JES EPDM Split
8JS 8JES EPDM Split
9JS 9JES EPDM Split
10JS 10JES EPDM Split

3JN 3JN Neoprene
4JN 4JN Neoprene
5JN 5JN Neoprene
6JN 6JN Neoprene
7JN 7JN Neoprene
8JN 8JN Neoprene

3JNS 3JNS Neoprene Split
4JNS 4JNS Neoprene Split
5JNS 5JNS Neoprene Split
6JNS 6JNS Neoprene Split
7JNS 7JNS Neoprene Split
8JNS 8JNS Neoprene Split
 
Product No. Product Description

4 4E EPDM
5 5E EPDM
6 6E EPDM
7 7E EPDM
8 8E EPDM
9 9E EPDM
10 10E EPDM
11 11E EPDM
12 12E EPDM
13 13E EPDM
14 14E EPDM
16 16E EPDM

4N 4N Neoprene
5N 5N Neoprene
6N 6N Neoprene
7N 7N Neoprene
8N 8N Neoprene
9N 9N Neoprene
10N 10N Neoprene
11N 11N Neoprene
12N 12N Neoprene
13N 13N Neoprene
14N 14N Neoprene
 
Product No. Product Description

6H 6H Hytrel
7H 7H Hytrel
8H 8H Hytrel
9H 9H Hytrel
10H 10H Hytrel
11H 11H Hytrel
12H 12H Hytrel

6HS 6HS Split Hytrel
7HS 7HS Split Hytrel
8HS 8HS Split Hytrel
9HS 9HS Split Hytrel
10HS 10HS Split Hytrel
11HS 11HS Split Hytrel
12HS 12HS Split Hytrel
13HS 13HS Split Hytrel
14HS 14HS Split Hytrel

10U 10U Urethane
11U 11U Urethane
12U 12U Urethane

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.

JE-JES-JN-JNS Sleeves

JE-JES-JN-JNS

J 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.

E-N Sleeves

E-N

These 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.

H-HS-U Sleeves

H-HS-U

H (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.

 

 


For Product Advice Call Us Now 01386 421005

 

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