• Couplings
  • Oldham Type

MOL

Flexible Couplings - Oldham Type - Set Screw Type / Clamping Type

  • High Allowable Misalignment
  • Small Eccentric Reaction Force

Dimension Drawing

MOLFlexible Couplings - Oldham Type - Set Screw Type / Clamping Type寸法図

Specs/CAD

Unit : mm

Part Number A L W E F M Screw Tightening
Torque (N・m)
Standard Bore Diameter (Dimensional Allowance H8)
D1-D2
CAD RFQ
MOL-16 16 7 18 7 3.5 M3 0.7 - CAD RFQ
MOL-20 20 9 23 9 4.5 M4 1.7 - CAD RFQ
MOL-25 25 11 28.2 11 5.5 M5 4 - CAD RFQ
MOL-32 32 12.7 32.7 14.5 6.5 M6 7 - CAD RFQ
MOL-40 40 14 32 17 7 M6 7 - CAD RFQ
MOL-50 50 17 38.2 23 8.5 M8 15 - CAD RFQ
MOL-63 63 21 46.6 28 10.5 M10 30 - CAD RFQ

Part Number Max. Bore Diameter
(mm)
Rated
Torque*1
(N・m)
Max. Torque
(N·m) *1
Max. Rotational Frequency
(min-1)
Moment of
Inertia
(kg・m2)*2
Static
Torsional
Stiffness
(N・m/rad)
Max. Lateral Misalignment
(mm)
Max. Angular
Misalignment
(°)
Mass
(g) *2
MOL-16 6.35 0.7 1.4 39000 3.2×10-7 31 1 3 7
MOL-20 8 1.2 2.4 31000 1.0×10-6 60 1.5 3 14
MOL-25 10 2 4 25000 3.0×10-6 140 2 3 27
MOL-32 14 4.5 9 19000 9.5×10-6 280 2.5 3 50
MOL-40 16 9 18 15000 2.3×10-5 540 3 3 80
MOL-50 20 18 36 12000 6.7×10-5 820 3.5 3 150
MOL-63 25 36 72 10000 2.2×10-4 1900 4 3 300

*1: Values with no load fluctuation and rotation in a single direction. If there is large load fluctuation, or both normal and reverse rotation, select a size with some margin. If ambient temperature exceeds 30°C, be sure to correct the rated torque and max. torque with temperature correction factor shown in the following table. The allowable operating temperature of MOL is -20℃ to 80°C. For more detailed information, please refer to Selection Guidelines.
*2: These are values with max. bore diameter.

Part Number Standard Bore Diameter (Dimensional Allowance H8)
D1・D2
3 4 5 6 6.35 8 9.525 10 12 14 15 16 18 20 25
MOL-16 - - - - - - - - - -
MOL-20 - - - - - - - - - -
MOL-25 - - - - - - - - -
MOL-32 - - - - - - - - - - -
MOL-40 - - - - - - - - - -
MOL-50 - - - - - - - - - -
MOL-63 - - - - - - - - - - -

●All products are provided with hex socket set screws (MOL).
● Tolerance of shaft bore on set screw type is H8.
● Recommended tolerance for shaft diameters is h6 and h7.
● A set of hubs with set screw type for one side and clamping type for the other side is available upon request.
● Bore and keyway modifications are available on request. Please take advantage of our modification services.


Ambient Temperature / Temperature Correction Factor

Ambient Temperature Temperature Correction Factor
-20℃ to 30℃ 1.00
30℃ to 40℃ 0.80
40℃ to 60℃ 0.70
60℃ to 80℃ 0.55

Structure

Set Screw Type

MOLOutside diameter φ16 - φ32MOLMOL-C

MOL/MOL-C/MOS/MOS-C_CFlexible Couplings - Oldham Type

MOLOutside diameter φ40 - φ63

MOL/MOL-C/MOS/MOS-C_CFlexible Couplings - Oldham Type

MOS MOS MOS-C

MOL/MOL-C/MOS/MOS-C_CFlexible Couplings - Oldham Type

Clamping Type

MOL-COutside diameter φ16 - φ32MOLMOL-C

MOL/MOL-C/MOS/MOS-C_CFlexible Couplings - Oldham Type

MOL-COutside diameter φ40 - φ63

MOL/MOL-C/MOS/MOS-C_CFlexible Couplings - Oldham Type

MOS-C MOS MOS-C

MOL/MOL-C/MOS/MOS-C_CFlexible Couplings - Oldham Type


Material/Finish

MOL
Hub A2017
Anodized
Spacer Polyacetal
Hex Socket Set Screw SCM435
Ferrosoferric Oxide Film (Black)
Hex Socket Head Cap Screw SCM435
Ferrosoferric Oxide Film (Black)

Characteristics

  • Recommended Applicable Motor
MOL MOS
Servomotor
Stepping Motor
General-purpose Motor

◎: Excellent ○: Very good ●: Available

  • Property
MOL MOS
Allowable Misalignment
Electrical Insulation
Allowable Operating Temperature -20℃ to 80℃ -20℃ to 80℃

◎: Excellent ○: Very good

  • This is an oldham type flexible coupling.
  • Slippage of hubs and a spacer allows large eccentricity and angular misalignment to be accepted.
  • The load on the shaft generated by misalignment is small and the burden on the shaft is reduced.
  • It has electrical insulation.
  • Standard type MOL and short type MOS are available.

Application

Parts feeder / Transport device

Precautions for Use

In case of mounting on D-cut shaft, be careful about the position of the D-cut surface of the shaft. ⇒Mounting and Maintenance
There are sizes where the hex socket head bolt exceeds the outer diameter of the coupling and the rotating diameter is larger than the outer diameter. Please be careful of the interference of coupling.


Comparison of Rated Torque

MOLFlexible Couplings - Oldham Type - Set Screw Type / Clamping Type


Related Products

MOL-SPCR

Oldham type coupling with high torque specification MOR is available.
MORMOR-CMOR-K

MOL/MOL-C/MOS/MOS-C_CFlexible Couplings - Oldham Type

MOL-SPCR

Oldham type couplings MOM with metal spacers are available.
MOMMOM-CMOM-K

MOL/MOL-C/MOS/MOS-C_CFlexible Couplings - Oldham Type


Related Service

Product List

Customer Service

  • Usage Method
  • Technical Question
  • Customization Products
USA and Canada

NBK America LLC

9:00 to 17:00 on weekdays, Eastern Standard Time

Asia and Europe

Nabeya Bi-tech Kaisha

9:00 to 17:15 on weekdays, Japan Standard Time