Dimension Drawing
Unit : mm
| Part Number | Max. Bore Diameter (mm) |
Torque（N・m） | Max. Rotational Frequency (min-1) |
Moment of Inertia (kg・m2)＊3 |
Static Torsional Stiffness (N･m/rad) |
Max. Lateral Misalignment (mm) |
Max. Angular Misalignment (°) |
Mass (g) ＊3 |
|
|---|---|---|---|---|---|---|---|---|---|
| Single-Direction Rotation＊1＊2 | Forward/Reverse Rotation＊2 | ||||||||
| MOR-68K-20-30 | 38 | 80 | 20 | 9000 | 3.3×10-4 | 6400 | 4.5 | 3 | 430 |
*1: Values based on the results of a durability test under rotation in a single direction, confirming durability of 1 million rotations or more.
*2: If ambient temperature exceeds 30°C, be sure to correct the values using the temperature correction factor in the table.
The allowable operating temperature of MOR-K is -20°C to 80°C.
*3: These are values with max. bore diameter.Details of Shaft Hole
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 |
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
MOR MOR
Clamping Type
MOR-C MOR-C
Set Screws + Key Type
MOR-K MOR-K
Clamping + Key Type
MOR-CK MOR-CK
Material/Finish
| MOR-K | |
|---|---|
| Hub | A2017 Anodized＊1 |
| Spacer | Polyacetal |
| Hex Socket Set Screw | SCM435 Ferrosoferric Oxide Film (Black) |
| Hex Socket Head Cap Screw | SCM435 Ferrosoferric Oxide Film (Black) |
＊1： Due to manufacturing process requirements, couplings may have bores and keyways with or without surface treatment. This does not affect the performance of the couplings.
Characteristics
- Applicable Motor
| MOR | |
|---|---|
| Servomotor | ● |
| Stepping Motor | ● |
| General-purpose Motor | ◎ |
- Property
| MOR | |
|---|---|
| High Torque | ◎ |
| Allowable Misalignment | ◎ |
| Small Eccentric Reaction Force | ◎ |
| Electrical Insulation | ◎ |
| Allowable Operating Temperature | -20℃ to 80℃ |
- 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 deviceChemical 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 |
Spacer's Projection Structure
Spacer's projection structure allows large angular to be effortlessly accepted. It reduces burden on the shaft.
Eccentric Reaction Force
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.
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.
Specification Changes
As described below, for the MOR Flexible Couplings, the conventional torque notation has been stated as the value for one-directional rotation without load fluctuations. To clarify the conditions under which the torque values are applicable, we will change the notation to separately indicate the One-Directional Rotation Torque and the Forward/Reverse Rotation Torque.See here for details
https://www.nbk1560.com/news/2026/20260831_MOR/
