The Rexroth R911306639 MSK060B-0600-NN-S2-UP0-RNNN is a compact synchronous servo motor from the IndraDyn S MSK series, engineered for industrial automation systems that require stable torque output, responsive speed control, accurate positioning, and long service life. Within the Rexroth servo motor family, the MSK060B frame size is well suited for machinery builders and maintenance teams that need a reliable motor for medium-duty dynamic axes without moving to a larger and heavier platform. Based on the official MSK060B technical data, the 0600 winding version offers a maximum speed of 6000 rpm, maximum torque of 15 Nm, continuous standstill torque of 5.0 Nm at 60 K, and 5.5 Nm at 100 K, which places it in a practical range for packaging equipment, automated handling modules, assembly stations, indexing systems, and other precision machine axes.
Unlike the previous model you asked about, this configuration is not centered on a holding-brake version. The official Rexroth type-code rules for IndraDyn S motors show that the “0” brake code means without holding brake, while “P” identifies a shaft with keyway, “U” identifies rotatable plugs, and “RNNN” indicates a design with increased concentricity. The same official manual also identifies S2 as a singleturn optical encoder with EnDat 2.1 interface. Taken together, this means the R911306639 version is especially relevant for machine designs that need precise feedback, secure mechanical torque transmission through a keyed shaft, and improved concentricity characteristics, but do not require an integrated holding brake.
Verified Technical Summary
The table below consolidates the most relevant published data for the motor family and the type-code-specific configuration of this model. The performance values come from the official MSK060B-0600-NN technical data, while the configuration descriptors come from the Rexroth type-code definitions in the same project planning manual.
| Item | Specification |
|---|---|
| Brand | Rexroth |
| Order Number | R911306639 |
| Model | MSK060B-0600-NN-S2-UP0-RNNN |
| Product Series | IndraDyn S MSK |
| Motor Type | Synchronous servo motor |
| Frame Size | MSK060B |
| Winding Code | 0600 |
| Cooling Method | NN, natural convection |
| Encoder Version | S2, singleturn optical encoder, EnDat 2.1 |
| Connector Version | U, rotatable plugs |
| Shaft Version | P, shaft with keyway |
| Brake Configuration | 0, without holding brake |
| Design Suffix | RNNN, increased concentricity |
| Continuous Torque at Standstill 60 K | 5.0 Nm |
| Continuous Torque at Standstill 100 K | 5.5 Nm |
| Maximum Torque | 15.0 Nm |
| Maximum Speed | 6000 rpm |
| Maximum Current | 24.4 A |
| Winding Resistance at 20 °C | 1.85 ohms |
| Winding Inductivity | 18.000 mH |
| Number of Pole Pairs | 4 |
| Rotor Inertia | 0.00048 kg·m² |
| Thermal Time Constant | 16.0 min |
| Protection Class | IP65 |
| Insulation Class | 155 |
| Ambient Operating Temperature | 0 to 40 °C |
| Approximate Weight | 5.7 kg |
Mechanical Design and Installation Value
One of the most useful aspects of this model is its mechanical balance. The MSK060B housing size keeps the motor compact enough for dense machine layouts, yet the official performance figures show that it still delivers a serious servo output for real industrial duty. The keyway shaft design is important in practical engineering because it supports positive torque transmission in coupling arrangements where the driven element must be fixed mechanically rather than relying only on friction locking. Rexroth’s project planning documentation also notes that for MSK060 motors with keyway, the corresponding keyway follows DIN 6885, which matters for replacement planning and shaft-side compatibility checks.
The rotatable plug connection is another feature with direct installation value. In compact automation equipment, cable exit direction is often not a minor detail but a real assembly constraint. A rotatable plug arrangement makes cable routing more manageable, especially when the motor is mounted near guarding, machine frames, or neighboring axes. In retrofit work, this can reduce mechanical interference and simplify the process of aligning power and feedback cables without redesigning the surrounding installation.
The RNNN increased-concentricity design also deserves attention. This is not just a suffix for catalog distinction. In real motion systems, improved concentricity can be valuable in applications where shaft runout, coupling behavior, or repeatable axis smoothness affects the final machine result. For users working with precision feed axes, measuring systems, or mechanisms sensitive to vibration and eccentricity, this design detail can be commercially and technically relevant.
Encoder and Control Characteristics
The encoder configuration is one of the most important reasons to choose this exact model instead of a similar-looking MSK060 variant. According to the official Rexroth motor encoder specifications, S2 corresponds to a singleturn optical encoder with EnDat 2.1, offering optical system accuracy and high-resolution position information within one mechanical rotation. Rexroth also states that singleturn encoder options such as S1 and S2 permit absolute indirect position recording within one mechanical rotation, but after a power failure or the first power-on, the axis generally must be moved to its home position unless the full working path remains within one motor revolution.
That distinction is important in system design. If an application mainly performs short-stroke, repeated positioning movements within one revolution or relies on homing at startup, the S2 configuration can be a very reasonable selection. It provides accurate position feedback and strong compatibility with Rexroth drive control environments while avoiding the added complexity of a multiturn feedback scheme when it is not necessary. For equipment manufacturers, this can be a sensible balance between motion quality and application-specific cost structure.
Performance in Industrial Use
From an application standpoint, the published 6000 rpm maximum speed and 15 Nm peak torque make this motor useful in machines that combine moderate inertia with dynamic motion requirements. The 5.0 to 5.5 Nm continuous standstill torque range also gives it a stable foundation for cyclic operation, controlled acceleration, and repeatable servo positioning. This is not an oversized heavy-axis motor, but it is a very capable solution for compact and mid-size automation modules that require a clean mix of speed, control precision, and reliable thermal behavior.
The official motor curves for the MSK060B-0600 show the expected servo performance envelope across speed range, confirming that the motor is designed for dynamic motion rather than only low-speed torque duty. In practical terms, that means it is well suited for indexing tables, packaging drives, transfer mechanisms, dosing systems, labeling equipment, and servo-driven subassemblies in larger production lines. It is also a strong candidate for spare-parts sourcing when the original machine builder specified an MSK060B-0600 family motor and the replacement must match the winding and mechanical interface correctly.
Product Weight and Why It Matters
For many buyers, motor weight is not a trivial detail. It affects shipping cost, installation handling, bracket sizing, service procedures, and even how easily the motor can be replaced in the field. The official MSK060B technical data lists the weight for the MSK060B-0600-NN version as 5.7 kg, with the bracketed value of 6.4 kg applying to versions with holding brake. Since this specific model is UP0, and the official type-code explanation confirms 0 = without holding brake, the correct practical weight statement for R911306639 MSK060B-0600-NN-S2-UP0-RNNN is approximately 5.7 kg.
That weight makes the motor manageable for technicians during installation and maintenance while still preserving the rigidity and performance expected from an industrial servo platform. For machine designers, it also helps maintain a favorable balance between axis mass and output capability, especially when the servo is mounted on moving structures where added weight directly affects dynamic performance.
Conclusion
The Rexroth R911306639 MSK060B-0600-NN-S2-UP0-RNNN is a well-configured servo motor for industrial users who need a compact but capable motion solution with 6000 rpm speed class, 15 Nm peak torque, singleturn EnDat 2.1 feedback, rotatable plugs, a keyway shaft, IP65 protection, and increased concentricity design. Its approximate motor weight is 5.7 kg, making it suitable for installations where both performance and manageable mechanical size are important.
For sourcing, replacement, or catalog use, it is best to keep the full designation together in the title and body text: Rexroth R911306639 MSK060B-0600-NN-S2-UP0-RNNN. That reduces ordering errors and helps engineers confirm the winding, encoder, shaft style, brake status, and design suffix before purchase or installation.
