The Rexroth R911315269 MSK071E-0300-NN-M1-UG2-NNNN is a synchronous servo motor from the IndraDyn S MSK family, engineered for industrial motion systems that require controlled torque, stable encoder feedback, and dependable performance in continuous automation duty. The exact order number R911315269 is matched in distributor listings to the full motor designation MSK071E-0300-NN-M1-UG2-NNNN, confirming that this is a specific configured servo motor rather than a generic MSK071 platform reference.
What makes this motor commercially important is not only the Rexroth brand or the MSK family name, but the precision of the full type code. In servo applications, the frame size alone is never enough. The encoder type, shaft version, connector arrangement, cooling method, and brake option all affect interchangeability, commissioning behavior, and machine compatibility. For buyers, maintenance teams, and machine builders, the full code R911315269 MSK071E-0300-NN-M1-UG2-NNNN is the correct identifier to use in quotations, spare-parts lists, and technical procurement documents.
Product Overview
| Item | Description |
|---|---|
| Brand | Rexroth |
| Order Number | R911315269 |
| Full Model | MSK071E-0300-NN-M1-UG2-NNNN |
| Product Family | IndraDyn S MSK |
| Product Type | Synchronous servo motor |
| Frame Size | 071 |
| Motor Length | E |
| Winding Code | 0300 |
| Cooling Method | Natural convection |
| Encoder Type | Optical multiturn absolute Hiperface encoder |
| Electrical Connection | Rotatable connector, 240° |
| Shaft Version | Smooth shaft with shaft sealing ring |
| Holding Brake | With holding brake 2 |
| Holding Brake Torque | 30 Nm |
| Housing Design | Standard |
| Approximate Weight | 25.1 kg |
| Protection Class | IP65 |
| Insulation Class | F |
| Maximum Speed | 4200 rpm |
| Maximum Torque | 84 Nm |
The configuration shown above is supported by Rexroth’s published MSK type-code description and by the MSK071E technical data. Rexroth defines M1 as a multiturn absolute Hiperface optical encoder, U as a rotatable 240° connector, G as a smooth shaft with shaft sealing ring, 2 as a holding-brake version, and NNNN as the standard housing design. The same technical data set shows that MSK071E motors with brake option 2 use a 30 Nm holding brake and a mass value of 25.1 kg for the brake-equipped configuration.
Type Code Breakdown
| Code Section | Meaning |
|---|---|
| MSK | IndraDyn S synchronous servo motor series |
| 071 | Frame size 071 |
| E | Motor length E |
| 0300 | Winding code 0300 |
| NN | Natural convection cooling |
| M1 | Optical multiturn absolute Hiperface encoder |
| U | Rotatable connector, 240° |
| G | Smooth shaft with shaft sealing ring |
| 2 | Holding brake 2 |
| NNNN | Standard design |
This breakdown matters because the type code directly defines the motor’s mechanical and electrical identity. The M1 encoder option is especially relevant in automation systems that need retained absolute position information. Rexroth’s project planning manual states that M1 is a multiturn absolute Hiperface optical encoder and that multiturn options M1 and M2 preserve absolute axis position within 4096 mechanical motor revolutions, even after voltage switch-off. That makes this variant more valuable in applications where restart behavior, homing efficiency, and position continuity are operational concerns.
The U and G portions of the code are also practical, not decorative. Rexroth defines U as a connector that is rotatable through 240 degrees, which is helpful when cable routing is constrained by machine geometry. The G shaft option identifies a smooth shaft with shaft sealing ring, a combination often chosen for precise couplings and applications where shaft sealing matters. The 2 in UG2 is equally significant, because it confirms the presence of holding brake 2 rather than a no-brake configuration or the lighter holding brake 1.
Technical Data
| Parameter | Value |
|---|---|
| Continuous torque at standstill, 60 K | 23.0 Nm |
| Continuous current at standstill, 60 K | 12.5 A |
| Continuous torque at standstill, 100 K | 28.0 Nm |
| Continuous current at standstill, 100 K | 15.2 A |
| Continuous torque at standstill, surface cooled | 43.7 Nm |
| Continuous current at standstill, surface cooled | 24.9 A |
| Maximum torque | 84.0 Nm |
| Maximum current | 56.3 A |
| Torque constant at 20 °C | 2.05 Nm/A |
| Voltage constant at 20 °C | 126.4 V/1000 rpm |
| Winding resistance at 20 °C | 0.79 ohm |
| Winding inductivity | 5.900 mH |
| Number of pole pairs | 4 |
| Rotor inertia without brake | 0.00290 kg·m² |
| Maximum speed | 4200 rpm |
| Sound pressure level | <75 dB(A) |
| Approximate Mass | 23.5 kg base, 25.1 kg with brake 2 |
| Operating Temperature | 0 to 40 °C |
| Degree of Protection | IP65 |
| Insulation Class | F |
These are the published MSK071E-0300-NN platform values from the Rexroth project planning manual. They show a motor designed for real industrial servo duty rather than light positioning only. The combination of 23.0 Nm continuous standstill torque at 60 K, 28.0 Nm at 100 K, and 84.0 Nm maximum torque gives the motor enough reserve for repeated acceleration, short overload events, and controlled motion under changing process loads. The maximum speed of 4200 rpm keeps it suitable for machinery that needs both dynamic response and stable closed-loop behavior.
Weight and Brake Configuration
Weight is one of the details that often gets copied incorrectly in reseller content, so it is worth stating clearly. Rexroth’s MSK071E technical data list the motor mass as 23.5 kg, with bracketed values for brake-equipped variants. The manual then clarifies that bracketed values are for motors with holding brakes, sorted by brake option. For MSK071E, the holding-brake table lists brake 1 at 23 Nm and brake 2 at 30 Nm. Because this exact motor is coded UG2, the correct practical product weight is approximately 25.1 kg, not 23.5 kg.
That distinction matters in real projects. Product weight affects freight estimates, mounting checks, replacement handling, and field-service preparation. A difference of more than one kilogram is not trivial when service personnel are preparing a replacement job or when a machine builder is validating bracket loads and manual-handling requirements. Using the brake-corrected mass also improves the credibility of the product page, because industrial buyers often compare listed values against manuals, nameplates, and known Rexroth platform data.
Practical Performance Profile
From an engineering perspective, the R911315269 version is a well-balanced MSK071E configuration for medium-duty to upper-medium-duty servo axes. It is more capable than compact servo motors, but it remains far more manageable than large-frame axis motors. That makes it a strong fit for packaging machinery, handling systems, indexing axes, transfer units, and automated stations where the machine requires repeatable torque and precise feedback without moving into very large motor classes. The available technical data show that it combines respectable continuous torque with a much higher peak-torque ceiling, which is exactly the profile many industrial machine axes need.
The M1 encoder adds clear application value. Because Rexroth states that multiturn absolute M1 and M2 encoders preserve absolute position information after power loss, this variant is more suitable for systems where reducing repeated homing cycles matters. In practical terms, that can support faster restart, less reference-loss risk, and better position management in machines that cycle frequently or stop and start under controlled automation sequences.
The holding brake 2 is another useful feature. Rexroth’s data show 30 Nm brake torque for holding brake 2 on MSK071E motors. That does not make the brake a service brake for personnel protection, but it does make the motor more suitable for applications where axis holding at standstill is required after power removal or during controlled stopping conditions. This broadens the motor’s fit in vertical or gravity-sensitive arrangements compared with a no-brake version.
Typical Application Areas
| Application Area | Why This Motor Fits |
|---|---|
| Packaging machinery | Good balance of torque, speed, and restart-friendly feedback |
| Handling and pick-and-place systems | Multiturn encoder improves positional continuity |
| Indexing and transfer axes | Strong peak torque for short dynamic moves |
| Assembly automation | Brake-equipped configuration helps standstill control |
| Conveyor positioning systems | Stable closed-loop control with industrial protection class |
| Retrofit and spare-parts replacement | Exact Rexroth type code reduces mismatch risk |
These are realistic use cases because they align with the motor’s published performance envelope and configuration. The combination of natural convection cooling, an optical multiturn absolute encoder, a rotatable connector, and a 30 Nm holding brake points to a servo motor intended for well-controlled industrial motion tasks rather than simple constant-speed rotation. The IP65 protection class and insulation class F also support normal factory use where dust resistance and thermal endurance matter.
Why This Exact Model Matters for Search and Procurement
For industrial SEO and technical product publishing, the strongest keywords are usually the exact order number and full type code. Buyers rarely search only for “Rexroth servo motor.” They more often search for precise terms such as “R911315269,” “MSK071E-0300-NN-M1-UG2-NNNN,” or “Rexroth MSK071E 25.1 kg servo motor.” A useful product page should therefore include the full code, readable technical tables, accurate brake and weight information, and a plain-language explanation of what the configuration means. That structure matches technical search intent far better than generic sales copy or repetitive keyword stuffing.
Conclusion
The Rexroth R911315269 MSK071E-0300-NN-M1-UG2-NNNN is a precision-configured IndraDyn S synchronous servo motor for industrial motion systems that need reliable torque, multiturn absolute feedback, and a brake-equipped standstill solution. Its official MSK071E technical platform provides 23.0 Nm continuous standstill torque at 60 K, 28.0 Nm at 100 K, 84.0 Nm maximum torque, and 4200 rpm maximum speed. Its exact configuration adds an optical multiturn absolute Hiperface encoder, a 240-degree rotatable connector, a smooth shaft with sealing ring, and holding brake 2 with 30 Nm brake torque. Based on Rexroth’s published brake-sorted mass values, the correct working product weight for this variant is approximately 25.1 kg. For OEM builds, machine retrofit, and exact spare-parts sourcing, this is a technically clear and commercially credible Rexroth servo motor reference.
