The SMC MSQB50R is a rotary table in the MSQ series designed for precise pneumatic indexing, turning, and positioning tasks in industrial automation systems. In SMC’s official classification, this model belongs to the MSQ Series Rotary Table, Rack & Pinion Style, MSQB Basic Type, size 50, with suffix R, which indicates the internal shock absorber version. The product integrates a rotary actuator and table into one compact unit, making it suitable for equipment builders who need controlled rotary motion with straightforward mounting and alignment. SMC also highlights that the series is equipped with an angle adjustment mechanism and is designed for easy alignment when mounting both the load and the body.
Unlike a simple rotary cylinder, the MSQB50R is intended for applications where the workpiece or fixture must be mounted directly to a rotating platform. Because the table and actuator are integrated, machine designers can reduce assembly complexity, improve installation accuracy, and simplify mechanical layout. The rack-and-pinion operating principle also gives the unit a solid balance between torque transmission, repeatable positioning behavior, and compact structure. For automated machinery, this means the MSQB50R can be used wherever a part needs to be rotated, indexed, oriented, or transferred between stations in a controlled way. The exact usefulness in a machine will depend on load inertia, operating pressure, cycle speed, and mounting conditions, but the product is clearly built for industrial rotary handling rather than simple oscillation alone.
Key Specifications
| Item | Description |
|---|---|
| Brand | SMC |
| Model | MSQB50R |
| Product Type | Rotary table |
| Series | MSQ Series |
| Structure | Rack & pinion style |
| Type | MSQB basic type |
| Size | 50 |
| Shock Absorber | Internal shock absorber |
| Fluid | Air (non-lube) |
| Maximum Operating Pressure | 1 MPa |
| Minimum Operating Pressure | 0.2 MPa |
| Ambient and Fluid Temperature | 0 to 60°C (no freezing) |
| Maximum Rotation | 190° |
| Angle Adjustment Range | 0 to 190° |
| Cylinder Bore Size | ø25 mm |
| Port Type | Rc 1/8 |
| Auto Switch | Without auto switch, built-in magnet |
| Number of Auto Switches | 2 pcs. or none |
| Product Net Weight | 2010 g |
| Weight Note | Auto switch mass not included |
Specification note: SMC’s official web catalog identifies MSQB50R as MSQ Series Rotary Table Rack & Pinion Style, MSQB Basic Type, size 50, suffix R = with internal shock absorber. The official MSQ documentation lists, for size 50 with internal shock absorber, 1 MPa maximum operating pressure, 0.2 MPa minimum operating pressure, 0 to 60°C ambient/fluid temperature, 0 to 190° angle adjustment range, 190° maximum rotation, ø25 cylinder bore, Rc 1/8 port size, and 2010 g mass, with the note that auto switch mass is excluded.
Product Features and Design Advantages
One of the strongest points of the MSQB50R is its integrated design. SMC specifically states that the product combines a table and a rotary actuator into one assembly. That matters in real equipment because it reduces the number of intermediate brackets, couplings, and alignment procedures normally required when separate actuator and table elements are used. Fewer extra mechanical interfaces usually mean less installation time, fewer tolerance stacking issues, and better reliability over the long term. For OEM machine builders, this can translate into faster assembly, cleaner machine design, and lower maintenance complexity.
Another important feature is the angle adjustment mechanism. The MSQB50R is not limited to only one fixed rotary position. According to SMC’s official MSQ catalog, the series allows up to 190° maximum rotation, and the rotation end can be adjusted. For the size 50 internal shock absorber version, the catalog indicates that the adjustment angle per rotation of the angle adjustment screw is 8.2°. This is useful in practical automation because not every workstation needs a full 90° or 180° index. Some machines require customized angular stops for loading, unloading, inspection, labeling, or orientation tasks. The ability to tune the angle helps the rotary table adapt to the machine, rather than forcing the machine designer to adapt everything around a fixed rotary range.
The internal shock absorber configuration is another reason this model is attractive for automated handling systems. The suffix R in the official web catalog identifies the internal shock absorber version. In normal operation, this helps reduce impact energy at the end of rotation and supports smoother motion termination compared with a simple hard stop. SMC’s technical documentation also notes an engineering limit: for the size 50 internal shock absorber type, the minimum rotation angle that will not reduce energy absorption ability is 60°. This is an important detail for real machine design, because if the user sets the rotation below that threshold, the piston stroke becomes smaller than the shock absorber’s effective stroke, and absorption performance decreases. That is exactly the kind of practical selection detail that distinguishes an industrial rotary table from a generic turning mechanism.
The MSQB50R is also built around standard pneumatic operating conditions. The official specification shows air (non-lube) as the working fluid, a maximum operating pressure of 1 MPa, and a minimum operating pressure of 0.2 MPa for the internal shock absorber type. These values place the unit comfortably within common industrial compressed-air systems. The Rc 1/8 port size is also a practical standard for this size range, making it relatively easy to integrate with common pneumatic fittings and tubing arrangements used in assembly equipment, transfer stations, and compact machine modules.
Weight and Installation Considerations
The product weight is often overlooked, but for machine design it matters. SMC’s official manual lists the mass of the basic type, size 50, with internal shock absorber as 2010 g, and specifically notes that this value does not include the auto switch mass. In other words, the standard body weight is about 2.01 kg before optional switch hardware is considered. This is a meaningful figure for engineers designing support plates, moving axes, vertical mounting arrangements, and rotating load systems. A unit in this weight class offers a good compromise: it is robust enough for industrial use, but still compact enough for many medium-duty automation assemblies.
From an installation standpoint, the MSQB50R is intended to simplify centering and mounting. SMC explicitly states that the product is designed for easy alignment when mounting the load and the body. That makes it particularly suitable for equipment where installation repeatability matters, such as fixture rotation, part orientation, or indexing in compact automated cells. In practice, this reduces commissioning effort and helps maintain mechanical consistency across repeated builds of the same machine platform. For manufacturers producing standardized automation equipment, that kind of repeatable install behavior is a real advantage.
Motion Control and Operating Direction
The MSQ catalog also explains the rotation behavior clearly. The rotary table turns clockwise when the A port is pressurized and counter-clockwise when the B port is pressurized. This is a useful point for system integration because it allows the machine designer to define rotational behavior directly through pneumatic circuit logic. In addition, because the angle can be adjusted, the unit can be configured for different end-stop positions depending on fixture geometry and process requirements. This is particularly useful in automated lines where a workpiece must be turned to a defined presentation angle for the next station.
The basic part number MSQB50R is identified by SMC as without auto switch, but the official catalog also notes built-in magnet and allows 2 pcs. or none for the number of auto switches. This means the base model is prepared for switch-based position detection if required, giving users flexibility between a simpler pneumatic-only setup and a more sensor-integrated automation design. That flexibility is helpful for machine builders serving different end users with different control philosophies.
Typical Industrial Use
From its structure and official specification set, the MSQB50R is best understood as a pneumatic rotary positioning unit for industrial automation. In practical use, it is well suited to part turning, small fixture indexing, orientation changes, and transfer operations where a stable rotary table is preferable to a bare shaft-type actuator. This is an engineering inference based on the product’s integrated table structure, rack-and-pinion rotary mechanism, adjustable angle design, and internal shock absorption. Those features collectively point toward controlled work handling applications rather than simple motion generation alone.
Conclusion
The SMC MSQB50R is a compact and practical MSQ series rotary table built for industrial automation systems that require repeatable rotary positioning with direct load mounting. Its official SMC definition is clear: MSQB basic type, size 50, rack-and-pinion style, with internal shock absorber. Key strengths include its integrated table and actuator structure, angle adjustment mechanism, maximum rotation of 190°, Rc 1/8 pneumatic port, ø25 bore size, and official product mass of 2010 g excluding auto switch weight. For engineers and buyers looking for a reliable pneumatic rotary table rather than a simple rotary cylinder, the MSQB50R is a solid and technically well-defined option within the SMC product range.
