The REXROTH R911312031 MSK061C-0600-NN-S1-UG1-NNNN is a compact high-speed synchronous servo motor from the Rexroth IndraDyn S MSK series. It is designed for industrial automation systems that require accurate motion control, strong dynamic response, reliable position feedback, and stable torque output in a compact motor package. This model is commonly used in packaging machines, handling equipment, printing systems, assembly machinery, feeding units, indexing mechanisms, laboratory automation, and other servo-driven production equipment.
For correct procurement and technical identification, the complete reference should include both the order number R911312031 and the full motor type code MSK061C-0600-NN-S1-UG1-NNNN. Public distributor listings identify R911312031 as the order reference for MSK061C-0600-NN-S1-UG1-NNNN, so these two identifiers should be kept together in quotations, spare-parts records, replacement requests, and inventory descriptions.
Product Identification
| Item | Description |
|---|---|
| Brand | REXROTH |
| Order Number | R911312031 |
| Full Model | MSK061C-0600-NN-S1-UG1-NNNN |
| Product Type | Synchronous Servo Motor |
| Product Family | IndraDyn S MSK Series |
| Motor Size | MSK061 |
| Motor Length | C |
| Winding Code | 0600 |
| Cooling Mode | Natural Convection |
| Encoder Type | S1 Singleturn Optical Encoder |
| Electrical Connection | Rotatable Plug 240 Degrees |
| Shaft Version | Plain Shaft With Shaft Sealing Ring |
| Holding Brake | Electrically Released Holding Brake 10 Nm |
| Design Version | Standard NNNN |
| Protection Rating | IP65 |
| Product Net Weight | 9.3 kg for the UG1 brake version |
| Typical Use | Compact High-Speed Servo Axis For Industrial Automation |
The MSK061C frame belongs to the medium-compact section of the MSK range. It is larger and more powerful than small MSK030 or MSK040 motors, but it remains much easier to install than larger MSK071, MSK100, or MSK101 units. This makes the R911312031 MSK061C-0600-NN-S1-UG1-NNNN suitable for machine builders who need a useful combination of torque, speed, encoder feedback, and compact dimensions.
Technical Specification Table
| Technical Parameter | Value |
|---|---|
| Motor Type | MSK061C-0600-NN |
| Continuous Torque At Standstill 60 K | 8.0 Nm |
| Continuous Current At Standstill 60 K | 7.7 A |
| Maximum Torque | 32.0 Nm |
| Maximum Current | 34.7 A |
| Torque Constant At 20 °C | 1.14 Nm/A |
| Voltage Constant At 20 °C | 70.5 V/min-1 |
| Winding Resistance At 20 °C | 1.55 Ohm |
| Winding Inductivity | 6.700 mH |
| Leakage Capacitance | 2.1 nF |
| Number Of Pole Pairs | 4 |
| Rotor Moment Of Inertia Without Brake | 0.00075 kg*m2 |
| Thermal Time Constant | 15.0 min |
| Maximum Speed | 6000 min-1 |
| Sound Pressure Level | Less Than 75 dB[A] |
| Ambient Operating Temperature | 0 To 40 °C |
| Degree Of Protection | IP65 |
| Insulation Class | F |
The Rexroth MSK061C-0600-NN technical data lists 8.0 Nm continuous torque at standstill at 60 K, 7.7 A continuous current at standstill at 60 K, 32.0 Nm maximum torque, 34.7 A maximum current, and 6000 min-1 maximum speed. The same technical data also lists IP65 protection, insulation class F, and an operating ambient temperature range of 0 to 40 °C.
Weight And Holding Brake Information
The weight of this exact configuration should be handled carefully because UG1 means the motor includes a holding brake. Public listings for the brake-equipped MSK061C-0600-NN-S1-UG1-NNNN commonly show an item weight around 9.2 kg to 9.3 kg. One supplier lists the item weight as 9.20 kg, while another product listing gives 9.3 kg.
The Rexroth technical data for the MSK061 holding brake lists a 10.0 Nm holding torque, 24 V rated voltage, 0.75 A rated current, and 0.4 kg brake mass for the optional brake. Since this model code ends with UG1, it should be treated as a brake-equipped motor, not as a no-brake UG0 version.
| Weight Item | Practical Reference |
|---|---|
| Product Net Weight For UG1 Version | 9.3 kg |
| Holding Brake Mass From Technical Data | 0.4 kg |
| Brake Holding Torque | 10.0 Nm |
| Export Packing Weight | Must Be Confirmed Separately |
| Logistics Note | Gross weight is normally higher than bare motor weight |
For international shipment, the packed weight should not be calculated from the motor mass alone. Carton packaging, wooden case, foam protection, shaft protection, cable accessories, and moisture-proof packing may increase the final gross weight. If the motor is being shipped by air freight or express courier, the volumetric weight should also be checked.
Model Code Explanation
| Code Section | Meaning |
|---|---|
| MSK | Rexroth IndraDyn S Synchronous Servo Motor |
| 061 | Motor Size 061 |
| C | Motor Length C |
| 0600 | Winding Code 0600 |
| NN | Natural Convection Cooling |
| S1 | Optical Singleturn Hiperface Encoder With 128 Increments |
| U | Electrical Plug Connection Rotatable 240 Degrees |
| G | Plain Shaft With Shaft Sealing Ring |
| 1 | Electrically Released Holding Brake 10 Nm |
| NNNN | Standard Design Version |
The Rexroth MSK061 type-code table identifies S1 as an optical singleturn Hiperface encoder with 128 increments, U as a rotatable 240-degree plug connection, G as a plain shaft with shaft sealing ring, and 1 as an electrically released 10 Nm holding brake.
The S1 encoder is suitable for closed-loop servo applications where the drive controller needs accurate rotor-position feedback during operation. A singleturn encoder provides precise position information within one mechanical revolution. For many cyclic automation axes, indexing movements, rotary modules, feed systems, and controlled positioning applications, this is sufficient when the machine architecture does not require absolute multi-revolution position retention.
The UG1 configuration is important for mechanical and electrical matching. The U connector style allows the plug to be rotated, which helps with cable routing in compact machine frames. The G shaft version uses a plain shaft with a sealing ring, making it suitable for clamping couplings, precision gearboxes, belt drives, and applications where a keyway is not required. The final 1 confirms that the motor includes a holding brake.
Application Areas
| Application Area | Typical Motor Function |
|---|---|
| Packaging Machinery | Indexing, cutting, sealing, film feeding, and synchronized movement |
| Printing Equipment | Roller adjustment, register control, feed axis operation |
| Assembly Automation | Pick-and-place axis, positioning unit, press-fit station |
| Handling Systems | Transfer axis, small lifting movement, rotary positioning |
| CNC Auxiliary Equipment | Tool-changing support, small feed axis, automatic loading mechanism |
| Laboratory Automation | Precise rotary motion, sample handling, small positioning units |
| Electronics Manufacturing | Dispensing, inspection, component feeding, test fixture movement |
| General Machine Building | Compact servo axis with brake and high-speed capability |
The 0600 winding makes this motor suitable for applications requiring higher speed capability. With a maximum speed of 6000 min-1, the MSK061C-0600-NN-S1-UG1-NNNN can be used in equipment where fast motion cycles, quick acceleration, and responsive servo behavior are required. At the same time, its 32.0 Nm maximum torque gives it useful overload capacity for acceleration and transient load changes.
Engineering Selection Notes
| Selection Point | Why It Matters |
|---|---|
| Full Model Code | Prevents confusion with similar MSK061C variants |
| Order Number | Confirms the configured Rexroth product |
| Encoder Type | Must match the servo drive feedback interface |
| Shaft Version | Affects coupling and gearbox compatibility |
| Brake Configuration | Required for load holding or vertical-axis safety logic |
| Connector Style | Affects cable routing and installation space |
| Cooling Mode | Natural convection requires proper mounting and heat dissipation |
| Weight | Important for mounting, handling, and shipment planning |
When replacing this motor, it is not safe to match only MSK061C-0600-NN. Similar variants may have a different encoder, shaft, brake status, or design suffix. For example, UG0 and UG1 look very similar, but UG0 is without holding brake while UG1 includes a holding brake. A wrong brake configuration can cause wiring problems, safety-function mismatch, or mechanical load-holding failure.
The holding brake should also be interpreted correctly. It is mainly intended to hold the motor shaft when the drive is disabled or when the machine is stopped. It is not normally used as a continuous dynamic braking device during regular machine operation. For vertical axes, suspended loads, or safety-critical mechanisms, the full machine design must be checked, including brake torque, load inertia, gear ratio, safety factor, and emergency-stop behavior.
Procurement And Replacement Format
| Required Field | Recommended Entry |
|---|---|
| Order Number | R911312031 |
| Full Model | MSK061C-0600-NN-S1-UG1-NNNN |
| Product Name | REXROTH IndraDyn S Synchronous Servo Motor |
| Net Weight | 9.3 kg |
| Brake | 10 Nm Electrically Released Holding Brake |
| Encoder | S1 Singleturn Hiperface Encoder |
| Shaft | Plain Shaft With Shaft Sealing Ring |
| Connection | 240 Degree Rotatable Plug |
| Condition Options | New, Surplus New, Refurbished, Or Tested Used |
For quotation and spare-parts supply, the safest product description is:
| Order Number | Full Model |
|---|---|
| R911312031 | MSK061C-0600-NN-S1-UG1-NNNN |
Product Summary
The REXROTH R911312031 MSK061C-0600-NN-S1-UG1-NNNN is a compact, high-speed IndraDyn S synchronous servo motor for precision industrial motion control. It combines the MSK061C frame, 0600 winding, natural-convection cooling, S1 singleturn Hiperface encoder, rotatable plug connection, plain shaft with shaft sealing ring, and 10 Nm electrically released holding brake. With 8.0 Nm continuous standstill torque at 60 K, 32.0 Nm maximum torque, 6000 min-1 maximum speed, IP65 protection, and an approximate product weight of 9.3 kg, this model is suitable for compact servo axes requiring both speed and reliable holding capability.
