EK7
Elastomer Coupling with expanding shaft

2 - 2,150 Nm

EK7 ELASTOMER COUPLING WITH EXPANDING SHAFT

Specifications EK7

EK7 series 5 10 20 60 150 300 450 800
Type (Elastomer insert)
AB C 
AB C 
ABC
ABC
ABC
ABC
ABC
ABC
Rated torque (Nm)TKN
9122
12.5164
17216
607520
16020042
32540584
53066095
9501100240
Max. torque* (Nm)TKmax
18244
25326
344212
12015035
32040085
650810170
10601350190
19002150400
Overall length (mm)A22 28 40 46 51 68 76 94
Outer diameter (mm)B25 32 42 56 66.5 82 102 136.5
Outer diameter screwhead (mm)BS25 32 44.5 57 68 85 105 139
Fit length (mm)C18 10.3 17 20 21 31 34 46
Fit length (mm)C212 20 25 27 32 45 55 60
Inner diameter possible from Ø to Ø H7 (mm)D14-12.7 5-16 8-25 12-32 19-36 20-45 28-60 35-80
Inner diameter possible from Ø to Ø H7 (inch)D10,250"-
0,500"
0,250"-
0,625"
0,375"-
0,875"
0,500"-
1,250"
0,750"-
1,375"
0,875"-
1,750"
1,125"-
2,250"
1,500"-
3,125"
Outher diameter possible from Ø to Ø h7 (mm)D210-16 13-25 14-30 23-36 26-42 38-60 42-70 42-80
Outher diameter possible from Ø to Ø h7 (inch)D20,437"-
0,625"
0,625"-
0,875"
0,625"-
1,125"
1,000"-
1,375"
1,125"-
1,625"
1,500"-
2,250"
1,750"-
2,750"
1,750"-
3,125"
Inner diameter (Elastomer insert) (mm)DE10.2 14.2 19.2 26.2 29.2 36.2 46.2 60.5
Screw (ISO 4762/12.9)E1M3 M4 M5 M6 M8 M10 M12 M16
Tighting torque of the mounting screw (Nm)E12 4 8 15 35 70 120 290
Screw (ISO 4762/12.9)E2 M4 M5 M6 M8 M10 M12 M16 M16
Tighting torque of the mounting screw (Nm)E24 9 12 32 60 110 240 300
Distance between centers (mm)F8 10.5 15.5 21 24 29 38 50.5
Distance (mm)G4 5 8.5 10 11 15 17.5 23
Hub length (mm)H7 7 10 11 16 20 27 27
Mass moment of inertia hub D1
(10-3 kgm2)
0.002 0.003 0.01 0.04 0.08 0.3 0.66 8
Mass moment of inertia hubD2
(10-3 kgm2)
0.002 0.01 0.04 0.1 0.2 1 2.6 9
Approx. weight (kg)0.04 0.05 0.12 0.3 0.5 0.9 1.5 7.6
Speed* (1/min)15,000 13,000 12,500 11,000 10,000 9,000 8,000 4,000
Speed balanced (103 min-1)
576543
536340
456035
313125
222618
222616
161712
13138
CAD Portal 5 10 20 60 150 300 450 800
2D/3D Data 

Properties

  • Design: Two coupling hubs are concentrically machined with curved jaws.

    • one side with clamping hub and screw per ISO 4762.

    • one side with expanding shaft and internally tapered
clamping element.
  • Tolerance: Overall clearance between shaft and hub 0.01 to 0.05 mm. Suggested bore tolerance for expanding shaft ISO H7.
  • Material:
    • clamping hub: up to series 450 high strength aluminum, from series 800 and up steel

    • expanding shaft and cone: steel

    • elastomer insert: precision molded, wear resistant, and thermally stable polymer
  • Speeds: See table below, *Please contact R+W
                  ISO 2.5 balance grade available
  • Properties of Elastomer Coupling model EK7:
    • short compact design
    • easy mounting
    • concentrically machined hubs
    • axial installation with expanding shaft
    • backlash free
    • electrically isolating

Overview