• Couplings
  • Oldham Type

Flexible Couplings - Oldham Type - Set Screw Type

MOC

  • High Torque
  • High Allowable Misalignment
  • Small Eccentric Reaction Force

Dimension Drawing

MOCFlexible Couplings - Oldham Type - Set Screw Type寸法図

Specs/CAD

Part Number AA1LWEFM Screw Tightening
Torque (N・m)
Standard Bore Diameter (Dimensional Allowance H8)
D1 - D2
Price
(USD)
CAD
Download
Add to Cart Additional Modification
MOC-12 12 12 3.9 14.4 5.2 1.9 M3 0.7 - 21.15 CAD Cart       
MOC-17 15 16.5 4.4 16 8.2 2.2 M3 0.7 - 22.53 CAD Cart       
MOC-23 20 22.5 5.8 21.6 12.2 2.9 M4 1.7 - 28.71 CAD Cart       
MOC-28 26 27.5 7.3 25.6 14.2 3.7 M4 1.7 - 30.36 CAD Cart       
MOC-33 30 32.5 10 32.6 15.2 5 M4 1.7 - 36.69 CAD Cart       
MOC-41 38 41 12.1 40.1 18.3 6.1 M5 4 - 69.73 CAD Cart       

Part Number Max. Bore Diameter
(mm)
Rated Torque
(N・m)*1
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
MOC-12 5 1.2 2.1 3000 6.8×10-8 25 1 3 3
MOC-17 8 1.8 3.6 3000 2.0×10-7 50 1 3 5
MOC-23 12 4 8 3000 8.1×10-7 150 1.2 3 11
MOC-28 14 8 14 3000 2.6×10-6 350 1.5 3 24
MOC-33 16 16 25 3000 6.1×10-6 450 2 3 39
MOC-41 20 30 46 3000 1.9×10-5 1100 2.5 3 77

*1: 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 MOC is -20°C to 80°C.
*2: These are values with max. bore diameter.

Part Number Standard Bore Diameter (Dimensional Allowance H8)
D1 - D2
3 4 5 6 8 10 12 14 15 16 18 20
MOC-12 - - - - - - - - -
MOC-17 - - - - - - - -
MOC-23 - - - - - - -
MOC-28 - - - - - - -
MOC-33 - - - - - -
MOC-41 - - - - -

● All products are provided with hex socket head cap screw.
● 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 and others are available upon request. ⇒Mounting and Maintenance
● Bore and keyway modifications are available on request. Please take advantage of our modification services.
● For the shaft insertion amount to the coupling, see Mounting/maintenance.⇒Mounting and Maintenance


Ambient Temperature / Temperature Correction Factor

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

Structure

Set Screw Type

MOC MOC

MOC/MOC-C_CFlexible Couplings - Oldham Type

Clamping Type

MOC-C MOC-C

MOC/MOC-C_CFlexible Couplings - Oldham Type


Material/Finish

MOC
Hub A2017
Anodized*1
Spacer Polyacetal with Recycled Carbon Fiber
Hex Socket Set Screw SCM435
Ferrosoferric Oxide Film (Black)
Hex Socket Head Cap Screw SCM435
Ferrosoferric Oxide Film (Black)

*1: With regard to bore surface treatment, process needs may result in a mixture of parts with and without surface treatment. This will not lead to any issues in terms of coupling performance.


Characteristics

  • Applicable motors
MOC
Servomotor
Stepping Motor
General-purpose Motor

◎: Excellent ○: Very good ●: Available

  • Property
MOC
High Torque
Allowable Misalignment
Small Eccentric Reaction Force
Allowable Operating Temperature -20°C to 80°C

◎: Excellent ○: Very good

  • This is an oldham type flexible coupling.
  • The spacer uses resin containing eco-friendly recycled carbon fiber. Higher-torque specifications than MOR.
  • Slippage of hubs and a spacer allows large eccentricity and angular alignment to be accepted.
  • The eccentric reaction generated by misalignment is small and the burden on the shaft is reduced.
  • The simple structure allows the unit to be easily assembled.
  • Compliant with the Japan Machine Accessory Association organizational standards (TES 1403).

Application

Sputtering device / Parts feeder / Industrial sewing machine / Amusement device

Selection

Selection Based on Shaft Diameter and Rated Torque

The area bounded by the shaft diameter and rated torque indicates the selection size.

MOC/MOC-C_CFlexible Couplings - Oldham Type

Selection Example

In case of selected parameters of shaft diameter of φ 8 and load torque of 0.4N•m, the selection size is MOC-23.

Comparison of Rated Torque

MOCFlexible Couplings - Oldham Type - Set Screw Type


Spacer's Projection Structure

Spacer's projection structure allows large angular to be effortlessly accepted. It reduces burden on the shaft.

MOC/MOC-C_CFlexible Couplings - Oldham Type

In the oldham-type coupling whose spacer has no projection, the spacer and hubs interfere with each other near outside diameter, so that the max. angular alignment is small (1° - 1.5°) and that the bending moment arises on the shaft.
NBK's oldham type coupling allows the angular alignment to be easily accepted since the projection serves as support. Bending moment does not arise. Therefore, the max. angular alignment is large (3°) and the burden on the shaft is reduced.


Change in static torsional stiffness due to temperature

This is a value under the condition where the static torsional stiffness at 20°C is 100%.
Changes in the static torsion spring constant within the operating temperature are shown in the graph.
Before using the unit, be aware of the deterioration of responsiveness.

MOC/MOC-C_TTechnical Information


Related Services

Product List

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