MK4
Miniature Bellows Coupling with radial set screws and press-fit connection

0.5 - 10 Nm

MK4 MINIATURE BELLOWS COUPLING WITH RADIAL SET SCREWS AND PRESS-FIT CONNECTION

MK4

Specifications MK4

MK4 Series
Rated torque (Nm)TKN
Overall length (inserted) (mm)A+0,2
Inside diameter possible from Ø to Ø H7 (mm)D1
Inside diameter possible from Ø to Ø H7 (mm)D2
Outside diameter (mm)B
Moment of inertia (gcm2)Jges.
Torsional stiffness (10³ Nm/rad)CT
Tightening torque of the fastening screw (Nm)E
Distance (mm)G
Mounting length (mm)C1
Mounting length (mm)C2
Preload compression (mm)H
Set screws ISO 4029E
Lateral (mm)max.
Angular (degree)max.
Axial recovery force at max. preload compression (N)
Axial* (mm)max.
CAD Portal
MK4 Serien5
Rated torque (Nm)TKN0,5
Overall length (inserted) (mm)A+0,222 | 25 | 28
Inside diameter possible from Ø to Ø H7 (mm)
D13-9
Inside diameter possible from Ø to Ø H7 (mm)
D23-6,35
Outside diameter (mm)B15
Moment of inertia (gcm2)Jges.2,0 | 2,2 | 2,5
Torsional stiffness (10³ Nm/rad)CT280 | 210 | 170
Tightening torque of the fastening screw (Nm)E1,3
Distance (mm)G2
Mounting length (mm)C16,5
Mounting length (mm)C29
Preload compression (mm)H0,4
Set screws ISO 4029E1x M3
Lateral (mm)max.0,15 | 0,2 | 0,25
Angular (degree)max.1 | 1,5 | 2
Axial recovery force at max. preload compression (N)5 | 3 | 2
Axial* (mm)max.0,4 | 0,5 | 0,6
5
CAD
MK4 Series
Rated torque (Nm)TKN
Overall length (inserted) (mm)A+0,2
Inside diameter possible from Ø to Ø H7 (mm)D1
Inside diameter possible from Ø to Ø H7 (mm)D2
Outside diameter (mm)B
Moment of inertia (gcm2)Jges.
Torsional stiffness (10³ Nm/rad)CT
Tightening torque of the fastening screw (Nm)E
Distance (mm)G
Mounting length (mm)C1
Mounting length (mm)C2
Preload compression (mm)H
Set screws ISO 4029E
Lateral (mm)max.
Angular (degree)max.
Axial recovery force at max. preload compression (N)
Axial* (mm)max.
CAD Portal
MK4 Serien15
Rated torque (Nm)TKN1,5
Overall length (inserted) (mm)A+0,226 | 31
Inside diameter possible from Ø to Ø H7 (mm)
D13-12
Inside diameter possible from Ø to Ø H7 (mm)
D23-9
Outside diameter (mm)B19
Moment of inertia (gcm2)Jges.5,5 | 6,0
Torsional stiffness (10³ Nm/rad)CT750 | 700
Tightening torque of the fastening screw (Nm)E1,3
Distance (mm)G2
Mounting length (mm)C17,5
Mounting length (mm)C210
Preload compression (mm)H0,5
Set screws ISO 4029E2x M3
Lateral (mm)max.0,15 | 0,2
Angular (degree)max.1,5 | 1,5
Axial recovery force at max. preload compression (N)4 | 3
Axial* (mm)max.0,5 | 0,7
15
CAD
MK4 Series
Rated torque (Nm)TKN
Overall length (inserted) (mm)A+0,2
Inside diameter possible from Ø to Ø H7 (mm)D1
Inside diameter possible from Ø to Ø H7 (mm)D2
Outside diameter (mm)B
Moment of inertia (gcm2)Jges.
Torsional stiffness (10³ Nm/rad)CT
Tightening torque of the fastening screw (Nm)E
Distance (mm)G
Mounting length (mm)C1
Mounting length (mm)C2
Preload compression (mm)H
Set screws ISO 4029E
Lateral (mm)max.
Angular (degree)max.
Axial recovery force at max. preload compression (N)
Axial* (mm)max.
CAD Portal
MK4 Serien20
Rated torque (Nm)TKN2
Overall length (inserted) (mm)A+0,228 | 33 | 37
Inside diameter possible from Ø to Ø H7 (mm)
D13-16
Inside diameter possible from Ø to Ø H7 (mm)
D23-12,7
Outside diameter (mm)B25
Moment of inertia (gcm2)Jges.21 | 23 | 25
Torsional stiffness (10³ Nm/rad)CT1200 | 1300 | 1200
Tightening torque of the fastening screw (Nm)E2,5
Distance (mm)G2,5
Mounting length (mm)C111
Mounting length (mm)C211
Preload compression (mm)H0,5
Set screws ISO 4029E2x M4
Lateral (mm)max.0,15 | 0,2 | 0,25
Angular (degree)max.1,5 | 1,5 | 2
Axial recovery force at max. preload compression (N)3 | 4 | 3
Axial* (mm)max.0,5 | 0,6 | 0,7
20
CAD
MK4 Series
Rated torque (Nm)TKN
Overall length (inserted) (mm)A+0,2
Inside diameter possible from Ø to Ø H7 (mm)D1
Inside diameter possible from Ø to Ø H7 (mm)D2
Outside diameter (mm)B
Moment of inertia (gcm2)Jges.
Torsional stiffness (10³ Nm/rad)CT
Tightening torque of the fastening screw (Nm)E
Distance (mm)G
Mounting length (mm)C1
Mounting length (mm)C2
Preload compression (mm)H
Set screws ISO 4029E
Lateral (mm)max.
Angular (degree)max.
Axial recovery force at max. preload compression (N)
Axial* (mm)max.
CAD Portal
MK4 Serien45
Rated torque (Nm)TKN4,5
Overall length (inserted) (mm)A+0,239 | 47
Inside diameter possible from Ø to Ø H7 (mm)
D16-22
Inside diameter possible from Ø to Ø H7 (mm)
D26-16
Outside diameter (mm)B32
Moment of inertia (gcm2)Jges.80 | 85
Torsional stiffness (10³ Nm/rad)CT7000 | 5000
Tightening torque of the fastening screw (Nm)E4
Distance (mm)G3,5
Mounting length (mm)C113
Mounting length (mm)C214
Preload compression (mm)H0,7
Set screws ISO 4029E2x M5
Lateral (mm)max.0,2 | 0,25
Angular (degree)max.1,5 | 2
Axial recovery force at max. preload compression (N)15 | 10
Axial* (mm)max.0,7 | 1
45
CAD
MK4 Series
Rated torque (Nm)TKN
Overall length (inserted) (mm)A+0,2
Inside diameter possible from Ø to Ø H7 (mm)D1
Inside diameter possible from Ø to Ø H7 (mm)D2
Outside diameter (mm)B
Moment of inertia (gcm2)Jges.
Torsional stiffness (10³ Nm/rad)CT
Tightening torque of the fastening screw (Nm)E
Distance (mm)G
Mounting length (mm)C1
Mounting length (mm)C2
Preload compression (mm)H
Set screws ISO 4029E
Lateral (mm)max.
Angular (degree)max.
Axial recovery force at max. preload compression (N)
Axial* (mm)max.
CAD Portal
MK4 Serien100
Rated torque (Nm)TKN10
Overall length (inserted) (mm)A+0,246 | 56
Inside diameter possible from Ø to Ø H7 (mm)
D16-28
Inside diameter possible from Ø to Ø H7 (mm)
D26-20
Outside diameter (mm)B40
Moment of inertia (gcm2)Jges.200 | 210
Torsional stiffness (10³ Nm/rad)CT9050 | 8800
Tightening torque of the fastening screw (Nm)E6
Distance (mm)G4
Mounting length (mm)C115
Mounting length (mm)C216
Preload compression (mm)H1
Set screws ISO 4029E2x M6
Lateral (mm)max.0,2 | 0,3
Angular (degree)max.1,5 | 2
Axial recovery force at max. preload compression (N)25 | 30
Axial* (mm)max.1 | 1,2
100
CAD

Properties

  • Design:
    • both hubs have radial set screws and integral dismounting grooves.
    • 
incorporates a blind mate press-fit connection.
  • Temperature range: -30° to +110°C (-22° F to +230° F)
  • Tolerance: On the hub/shaft connection 0.01 to 0.08 mm.
  • Service life: These couplings have an infinite life, and are maintenance-free if the technical ratings are not exceeded.
  • Material:
    • bellows made of highly flexible high-grade stainless steel
    • 
clamping hubs and tapered female segment on bellows face from aluminium
    • tapered segment on the hub face: glass-fiber reinforced plastic deposited onto an aluminium hub
  • Speeds: Up to 20,000 rpm, in excess of 20,000 rpm available with balanced version.
  • Non-standard application: Custom designs with varied tolerances, keyways, non-standard material and bellows are available upon request.
  • Properties of Miniature Coupling model MK4:
    • Absolutely backlash-free and torsionally rigid
    • compensates for 3-axis of misalignment
    • easy mounting and dismounting
    • electrically insulated
    • no wear
    • low moment of inertia


Overview