• Couplings
  • Oldham Type

MOR-K

Flexible Coupling - Oldham - type - Set Screw + Key type

  • High Torque
  • High Allowable Misalignment

Dimension Drawing

MOR-KFlexible Coupling - Oldham - type - Set Screw + Key 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
MOR-15K 15 4.4 16 8.2 2.2 M3 0.7 - CAD RFQ
MOR-17K 17 4.9 19.7 8.2 2.5 M3 0.7 - CAD RFQ
MOR-20K 20 5.8 21.6 12.2 2.9 M4 1.7 - CAD RFQ
MOR-26K 26 7.3 25.6 14.2 3.7 M4 1.7 - CAD RFQ
MOR-30K 30 10 32.6 16.2 5 M4 1.7 - CAD RFQ
MOR-34K 34 11.1 34 16.2 5.6 M5 4 - CAD RFQ
MOR-38K 38 12.1 40.1 20.3 6.1 M5 4 - CAD RFQ
MOR-45K 45 13.8 46 22.3 6.9 M6 7 - CAD RFQ
MOR-55K 55 18.7 57 26.5 9.4 M8 15 - CAD RFQ
MOR-68K 68 24 77 38.5 12 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
MOR-15K 8 1.6 3.2 42000 1.4×10-7 80 1 3 4
MOR-17K 8 2.2 4.4 37000 2.8×10-7 120 1.2 3 7
MOR-20K 12 3.2 6.4 31000 5.6×10-7 120 1.2 3 8
MOR-26K 14 6 12 24000 2.0×10-6 300 1.5 3 19
MOR-30K 16 15 30 21000 5.4×10-6 530 2 3 37
MOR-34K 16 16 32 18000 9.0×10-6 1000 2.5 3 51
MOR-38K 20 28 56 16000 1.5×10-5 1500 2.5 3 68
MOR-45K 22 30 60 14000 3.2×10-5 2400 3 3 110
MOR-55K 26 45 90 11000 1.0×10-4 4100 4 3 230
MOR-68K 38 80 160 9000 3.3×10-4 6400 4.5 3 430

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

Unit : mm

Part Number Standard Metric Bore Diameter (dimensional allowance H8)
D1・D2
6 8 10 12 14 15 16 18 20 22 25 28 30 35 38
MOR-15K
MOR-17K
MOR-20K
MOR-26K
MOR-30K
MOR-34K
MOR-38K
MOR-45K
MOR-55K
MOR-68K

Unit : inch

Part Number Standard Inch Bore Diameter (dimensional allowance H8)
D1・D2
1/2 5/8 3/4 7/8
MOR-26K
MOR-30K
MOR-34K
MOR-38K
MOR-45K
MOR-55K

● 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.
● Bore and keyway modifications are available on request. Please contact our customer service.

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

Slip torque

As in the table below, the clamping type MOR-C has different slip torque according to the bore diameter. Take care during selection.

Unit : N・m

Part Number Bore Diameter
3 4 5 6 6.35 8 9.525 10 12 14 15 16 18 20 22 25 28 30 35
MOR-12C 0.8 1.9 2.4
MOR-15C 2.3 3.5 4.8
MOR-17C 2.7 3.6 4
MOR-20C 3.7 4.2 4.3 5.7 6.1
MOR-26C 4 6.4 9.3 11
MOR-30C 7.5 13 13 17 20
MOR-34C 16 18 23 30
MOR-38C 19 20 24 30 34 37 38
MOR-45C 34 41 42 44 48
MOR-55C 73 75 88
MOR-68C 100 100 100 100 110 110

These are test values based on the conditions of shaft dimensional allowance: h7, hardness: 34-40 HRC, and screw tightening torque of the values described in MOR-C dimension tables. They are not guaranteed values.
Slip torque changes with usage conditions. Carry out tests under conditions similar to actual conditions in advance.


Structure

Set Screw Type

MOR MOR

MOR/MOR-C/MOR-K/MOR-CK_CFlexible Couplings - Oldham Type

Clamping Type

MOR-C MOR-C

MOR/MOR-C/MOR-K/MOR-CK_CFlexible Couplings - Oldham Type

Set Screws + Key Type

MOR-K MOR-K

MOR/MOR-C/MOR-K/MOR-CK_CFlexible Couplings - Oldham Type

Clamping + Key Type

MOR-CK MOR-CK

MOR/MOR-C/MOR-K/MOR-CK_CFlexible Couplings - Oldham Type


Material/Finish

MOR-K
Hub A2017
Alumite Treatment
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
MOR
Servomotor
Stepping Motor
General-purpose Motor

◎: Excellent ○: Very good ●: Available

  • Property
MOR
High Torque
Allowable Misalignment
Small Eccentric Reaction Force
Electrical Insulation
Allowable Operating Temperature -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 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.

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.

MOR/MOR-C/MOR-K/MOR-CK_CFlexible Couplings - Oldham Type

MOR/MOR-C/MOR-K/MOR-CK_CFlexible Couplings - Oldham Type

Selection Example

In case of selected parameters of shaft diameter of φ 6 and load torque of 0.3 N•m, the selected size is MOR-15.

Details of Shaft Hole

MOR-KFlexible Coupling - Oldham - type - Set Screw + Key type

Metric Shaft Hole

Unit : mm

Standard Bore Diameter
D
Keyway Key
b t Nominal
Dimension
b x h
Standard
Dimension
Allowance
(JS9)
Standard
Dimension
Allowance
6 2 ±0.0125 1.0 0~
+0.1
2 × 2
8 3 ±0.0125 1.4 0~
+0.1
3 × 3
10・12 4 ±0.0150 1.8 0~
+0.1
4 × 4
14・15・16 5 ±0.0150 2.3 0~
+0.1
5 × 5
18・20・22 6 ±0.0150 2.8 0~
+0.1
6 × 6
25・28・30 8 ±0.0180 3.3 0~
+0.2
8 × 7
35・38 10 ±0.0180 3.3 0~
+0.2
10 × 8

Excerpt from JIS B 1301

Inch Shaft Hole

Unit : inch

Standard Inch Bore Diameter
D
Keyway
Wk T
Standard
Dimension
Allowance Standard
Dimension
Allowance
1/2 1/8 0~+0.002 0.560 0~+0.01
5/8 3/16 0~+0.002 0.709 0~+0.01
3/4 3/16 0~+0.002 0.837 0~+0.01
7/8 3/16 0~+0.002 0.964 0~+0.01

Comparison of Rated Torque

MOR-KFlexible Coupling - Oldham - type - Set Screw + Key type


Chemical resistance of the spacer (Polyacetal)

Effect
Weather Resistance Slight Change in Color
Weak Acid Resistance Minor Effect
Strong Acid Resistance Effect
Weak Alkali Resistance Minor Effect
Strong Alkali Resistance Minor Effect
Organic Solvent Resistance Includes Resistance

Physical property of the spacer (Polyacetal)

Test Method unit Polyacetal
Density ISO 1183 g/cm3 1.36
Water Absorption
(23°C, Dipped for 24 hr)
ISO 62 % 0.7
Tensile Strength ISO 527-1, 2 N/mm2 52
Bending Strength ISO 178 N/mm2 72
Charpy Impact Strength
(with Notch)
ISO 179 / 1eA kJ/m2 5.9
Deflection Temperature Under Load
(1.8MPa)
ISO 75-1, 2 °C 85
Insulation Breakdown Strength
(3mmt)
IEC 60243-1 kV/mm 20
Volume Resistivity IEC 60093 Ω·cm 1 x 1014
Combustibility UL94 - HB

Eccentric Reaction Force

These are initial slippage load values of hubs and a spacer.
After running-in operation, the slippage load becomes small, the load on the shaft due to misalignment becomes lowered, and the burden on the shaft bearing is reduced.

MOR/MOR-C/MOR-K/MOR-CK_TTechnical Information

MOR/MOR-C/MOR-K/MOR-CK_TTechnical Information


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.

MOR/MOR-C/MOR-K/MOR-CK_TTechnical Information


Related Products

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

MOR/MOR-C/MOR-K/MOR-CK_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