The SMC MSQB1A is a compact pneumatic rotary table designed for precision turning, indexing, and positioning tasks in small automation equipment. It belongs to SMC’s MSQ Series, which combines a rotary actuator and table into a single body, helping machine builders reduce installation complexity and improve alignment accuracy. Within this family, MSQB identifies the basic type, size 1 is the smallest frame in the small-size group, and the suffix A indicates the version with adjustment bolt. SMC also describes the MSQ series as featuring an angle adjustment mechanism and making it easier to center the body and the mounted load during installation.
Unlike a simple rotary cylinder, the MSQB1A is intended for applications where the workpiece, fixture, or tooling must be mounted directly on a rotating platform. That integrated structure gives the product a practical advantage in compact equipment, because the designer does not need to assemble a separate turntable on top of a standalone actuator. The result is a cleaner mechanical layout, fewer assembly steps, and more consistent installation. For small automation systems, this matters because even minor alignment errors can affect cycle stability, part presentation, and downstream process accuracy.
Key Specifications
| Item | Description |
|---|---|
| Brand | SMC |
| Model | MSQB1A |
| Product Type | Rotary table |
| Series | MSQ Series |
| Structure | Rack & pinion type |
| Type | Basic type |
| Size | 1 |
| Suffix Meaning | With adjustment bolt |
| Operating Fluid | Air (non-lube) |
| Maximum Operating Pressure | 0.7 MPa |
| Minimum Operating Pressure | 0.1 MPa |
| Ambient / Fluid Temperature | 0 to 60°C, no freezing |
| Angle Adjustment Range | 0 to 190° |
| Maximum Rotation | 190° |
| Cylinder Bore Size | Ø6 mm |
| Port Size | M3 × 0.5 |
| Hollow Axis | Ø3.5 mm |
| Rotation Direction | A port: clockwise / B port: counter-clockwise |
| Adjustment Angle per One Rotation of Adjustment Screw | 8.2° |
| Product Net Weight | 75 g |
| Weight Note | Excluding auto switch weight; older SMC catalog graphic shows 70 g |
The technical data above is based on SMC’s official MSQ documentation for sizes 1, 2, 3, and 7, together with SMC’s MSQ series catalog pages showing the MSQB1A configuration and dimensional group. The latest accessible official specification sheet for small sizes lists 0.7 MPa maximum operating pressure, 0.1 MPa minimum operating pressure, 0 to 60°C, 0 to 190° angle adjustment range, 190° maximum rotation, Ø6 mm bore, and M3 × 0.5 port size for size 1. SMC’s newer catalog/manual page lists the size 1 basic type mass as 75 g excluding auto switch weight, while an older MSQ series catalog image block shows 70 g for MSQB1A.
Product Structure and Functional Advantages
One of the main strengths of the MSQB1A is its integrated construction. SMC presents the MSQ family as a rotary table in which the table and rotary actuator are integrated, rather than being supplied as separate motion and mounting parts. In actual machine design, this reduces the need for extra brackets, couplings, and alignment procedures. For compact automation systems, this is especially useful because the available space is limited and the designer often needs a ready-made rotary platform with predictable mounting behavior. The MSQB1A provides that in a very small form factor.
The basic type positioning of MSQB1A also matters. SMC separates the MSQ series into MSQA high precision type and MSQB basic type. That means the MSQB1A is intended for applications where compact rotary motion, simple installation, and general-purpose indexing are more important than the tighter displacement performance associated with the high-precision version. For many machine builders, that is the more economical and practical selection, particularly for light fixtures, small transferred parts, and compact workholding tasks.
Another important feature is the adjustment bolt design. With the MSQB1A, the rotation end can be adjusted within the available range instead of being locked to a single factory-fixed angle. SMC states that the series supports an angle adjustment range of 0 to 190°, with a maximum rotation of 190°, and for size 1 the adjustment angle per rotation of the adjustment screw is 8.2°. That gives the installer a practical way to fine-tune the rotary end position during setup or machine commissioning. This is particularly useful in applications where a part must be turned to a custom presentation angle rather than simply moved through a fixed 90° or 180° stroke.
Pneumatic Characteristics
From a pneumatic standpoint, the MSQB1A is straightforward and easy to integrate. It uses air without lubrication as the operating medium, with a maximum operating pressure of 0.7 MPa and a minimum operating pressure of 0.1 MPa. The specified ambient and fluid temperature range is 0 to 60°C without freezing, which is standard for many indoor industrial pneumatic systems. Because of these mainstream operating conditions, the product can be incorporated into common factory air circuits without unusual support requirements.
The actuator size is intentionally small. For size 1, SMC specifies a Ø6 mm cylinder bore and M3 × 0.5 ports. The series catalog also shows a Ø3.5 mm hollow axis for size 1. This compact scale makes the MSQB1A suitable for lightweight tooling, miniature transfer devices, compact assembly fixtures, and other automation tasks where a small and efficient turning mechanism is required. It is not a heavy-duty indexing table, and it should not be treated as one. Its value lies in being a very small, well-integrated rotary platform for controlled pneumatic movement.
SMC also documents the operating direction clearly: the table rotates clockwise when the A port is pressurized and counter-clockwise when the B port is pressurized. That makes pneumatic logic design easier, because the direction of motion is directly tied to port control in a predictable way. In practical equipment design, simple directional logic reduces commissioning time and makes maintenance easier for technicians who need to diagnose movement issues later.
Weight and Design Considerations
For compact automation equipment, weight is a real engineering consideration. It affects bracket stiffness, moving mass, shipping estimates, and the overall structure of the machine module. In the case of the MSQB1A, SMC’s accessible official documents do not fully agree: one official document for small-size MSQ models lists the basic type size 1 mass as 75 g, excluding auto switch weight, while an older English MSQ series catalog page lists 70 g next to the MSQB1A dimensional block. Because the newer official material points to 75 g, that is the safer commercial figure to use in product descriptions and quotations, while noting that some older catalog material shows 70 g.
In practical terms, whether the product is treated as 70 g or 75 g, it remains an extremely lightweight rotary table. That low weight supports its use in compact devices, laboratory-scale pneumatic fixtures, small inspection systems, and miniaturized automation modules. A lightweight body can reduce the burden on supporting structures and helps when the machine designer needs to keep total module mass under control. For applications where speed, compactness, and simple installation matter more than high payload capability, this is a favorable profile.
Installation Benefits
SMC emphasizes that the MSQ series is designed for easy center alignment during mounting and supports wiring and piping selection according to mounting conditions. The catalog pages also indicate that piping can be selected from different directions depending on the installation layout. For a small model like MSQB1A, these details are important because the product is often used in equipment where surrounding space is restricted by sensors, brackets, guide units, or other actuators. Flexible mounting and piping options make the product easier to package into real machines.
Because the MSQB1A is a rotary table rather than a bare rotary shaft actuator, it is particularly suitable when the user wants to mount a small plate, fixture, or tooling surface directly to the rotating top. This can simplify fixture design and reduce tolerance stack-up. In many compact machines, reducing the number of intermediate parts is one of the easiest ways to improve repeatability and shorten assembly time. That is one of the practical reasons the MSQ family has remained a useful format in pneumatic automation.
Typical Applications
The MSQB1A is best suited to light-duty rotary tasks in compact pneumatic automation. Typical use cases include small part orientation, fixture turning, component presentation, transfer positioning, inspection angle change, and indexing functions in miniature assembly stations. This application profile is an engineering inference drawn from the model’s official structure, size, bore, rotation range, hollow-axis design, and lightweight construction. In other words, the product is most appropriate where compact controlled rotation is needed, not where high torque or large inertial loads are the main requirement.
For example, a small assembly machine may use the MSQB1A to rotate a part from a load position to an inspection position. A lab automation fixture may use it to turn a sample carrier to a second processing angle. A lightweight positioning jig may use it to present a workpiece face to a sensor or small tool head. In each case, the benefit comes from compact integrated rotary motion with adjustable end positions and simple pneumatic control.
Conclusion
The SMC MSQB1A is a very compact MSQ series rotary table intended for light-duty pneumatic indexing and positioning applications. Officially, it is a rack and pinion basic type rotary table, size 1, with adjustment bolt. Its main advantages include an integrated table-and-actuator structure, 0 to 190° angle adjustment range, 190° maximum rotation, Ø6 mm bore, M3 × 0.5 port size, Ø3.5 mm hollow axis, and a very low body mass of approximately 75 g by the newer official spec, although some older SMC catalog material shows 70 g. For compact automation equipment that needs a small, practical, and easy-to-install pneumatic rotary table, the MSQB1A is a credible and well-defined option.
