The SMC CRB1BW50-190S is a compact vane-type pneumatic rotary actuator designed for controlled angular movement in industrial automation equipment. Within SMC’s CRB1 family, this model code indicates a basic mounting type, W double-shaft construction with long shaft key and four chamfers, 50 mm body size, and a 190-degree single-vane rotation pattern. SMC classifies 190° as a semi-standard rotating angle in the CRB1 range, while the same product family is described as compact, space-saving, suitable for direct mounting, highly reliable, and available with both side and axial port arrangements.
Unlike a standard 90-degree quarter-turn actuator, the CRB1BW50-190S offers a wider rotation range that can simplify machine layouts requiring more than simple open-close movement. In practical equipment design, a 190-degree stroke can provide extra clearance, more flexible linkage geometry, and easier positioning when tooling or fixtures need to move slightly beyond a straight half-turn. That wider sweep is one reason semi-standard angle versions remain useful in assembly fixtures, transfer devices, turning stations, and compact indexing mechanisms. This application fit is an engineering inference based on the published 190-degree rotation option and the compact direct-mount structure of the CRB1 family.
Model Identification
| Item | Description |
|---|---|
| Brand | SMC |
| Model | CRB1BW50-190S |
| Product Category | Pneumatic rotary actuator |
| Series | CRB1 |
| Actuation Principle | Vane type |
| Mounting Style | Basic |
| Shaft Type | W = Double shaft, long shaft key and four chamfers |
| Body Size | 50 mm |
| Rotation Angle | 190° |
| Vane Type | Single vane |
| Rotation Classification | Semi-standard |
The model structure above is based on SMC’s official ordering logic for the CRB1 series. The same catalog shows that 190 is the semi-standard symbol for 190° under the single-vane configuration, while W identifies the double-shaft keyed version.
Main Technical Specifications
| Item | Specification |
|---|---|
| Fluid | Air, non-lube |
| Proof Pressure | 1.5 MPa |
| Max. Operating Pressure | 1.0 MPa |
| Min. Operating Pressure | 0.15 MPa |
| Ambient and Fluid Temperature | 5 to 60°C |
| Rotation Time Adjustment Range | 0.1 to 1 s/90° |
| Allowable Kinetic Energy | 0.082 J |
| Allowable Radial Load | 250 N |
| Allowable Thrust Load | 196 N |
| Port Location | Side ported or axial ported |
| Port Size | Rc 1/8 for size 50 |
| Mounting Options in Series | Basic, Foot |
| Volume at 190° | 51 cm³ |
These values come from the official SMC CRB1 catalog tables for the size 50 single-vane version. The catalog lists the working pressure range, proof pressure, ambient/fluid temperature, allowable kinetic energy, shaft load limits, porting style, and internal volume for the semi-standard 190° configuration.
Product Weight
For the SMC CRB1BW50-190S, the official SMC catalog lists the main body weight of the 50 mm, 190-degree, single-vane version as 788 g, which is 0.788 kg. This is the correct core weight to use for catalog writing, quotation sheets, and product listings when describing the actuator body itself. SMC also lists an additional 65 g for an auto switch unit plus two auto switches and 385 g for the foot bracket assembly, but those additions apply when such accessories are included. Since the part number you provided is CRB1BW50-190S, the cleanest published statement is main body weight: 788 g.
| Weight Category | Value |
|---|---|
| Main body weight | 788 g |
| Main body weight | 0.788 kg |
| Auto switch unit + 2 auto switches | +65 g |
| Foot bracket assembly | +385 g |
This weight breakdown is useful because many commercial listings mix the bare actuator weight with accessory-installed weight. For engineering and procurement accuracy, those values should be separated.
Design Features and Engineering Value
A key technical advantage of the CRB1BW50-190S is its single-vane architecture. In SMC’s CRB1 range, the wider rotation options such as 180°, 190°, 270°, and 280° are associated with the single-vane design, while the double-vane versions are used for 90° and 100° rotation. This means the CRB1BW50-190S is specifically configured for extended angular travel rather than short-stroke quarter-turn duty. For machinery builders, that matters because the actuator is not just a size-50 rotary unit; it is a size-50 rotary unit optimized for a wider sweep angle in a compact body.
The W shaft type also adds practical value. SMC defines W as a double shaft with long shaft key and four chamfers, which gives engineers more flexibility when coupling the actuator to fixtures, levers, plates, or synchronized rotary mechanisms. In many machine designs, a double-shaft layout makes it easier to mount linkages, provide visual position reference, or distribute load more symmetrically across the structure. That can simplify equipment design and reduce the need for secondary transmission components.
Another important point is mechanical load control. The catalog gives the size 50 version an allowable thrust load of 196 N, and allowable kinetic energy of 0.082 J. These are not minor details. In real factory service, rotary actuators often fail early not because the air pressure is wrong, but because the external load is offset, inertia is underestimated, or the stop impact is too aggressive. The CRB1BW50-190S should therefore be selected with the full rotating mass, linkage geometry, and stopping condition in mind.
Operating Characteristics
The published operating range of 0.15 to 1.0 MPa allows this actuator to fit standard industrial compressed-air systems, while the 1.5 MPa proof pressure provides the expected safety margin for properly specified pneumatic use. The 5 to 60°C ambient and fluid temperature range also places the CRB1BW50-190S squarely in normal factory operating conditions. Meanwhile, the speed adjustment range of 0.1 to 1 second per 90 degrees gives the designer enough room to tune motion using ordinary pneumatic flow controls, balancing cycle time against shock reduction.
The listed 51 cm³ internal volume for the 190-degree, single-vane, size-50 version is also relevant in system design. Air consumption affects response, valve selection, and tubing performance, especially in high-cycle machines. While the actuator is compact, it should still be integrated with correctly sized valves and sensible speed control so that the wider 190-degree stroke remains stable and repeatable.
Application Suitability
From an application standpoint, the CRB1BW50-190S is best suited to compact automation tasks requiring controlled rotation slightly beyond 180 degrees. That extra angular margin can be valuable when a workpiece carrier, clamp plate, or transfer arm needs additional travel for clearance or handoff. Typical use cases can include rotary positioning fixtures, turning units, changeover plates, stopper mechanisms, and light-duty transfer stations. This is an engineering use-case assessment based on the product’s compact body, direct-mount suitability, and extended single-vane rotation pattern.
It is also a sensible choice when a designer wants the simplicity of pneumatic actuation rather than the cost and control complexity of an electric rotary module. The CRB1 family is presented by SMC as a compact, highly reliable rotary actuator platform, and the 190-degree version extends that platform into applications where standard half-turn motion is not quite enough. In other words, this model is not merely a variation of a standard actuator; it addresses a specific layout problem in space-constrained automation.
Selection and Integration Notes
For correct integration, buyers should pay attention to three points. First, 190° is a semi-standard angle, not the standard 180° version, so documentation and spare-part records should reflect the exact code CRB1BW50-190S. Second, the official main body weight is 788 g, which is slightly different from the standard 180° size-50 single-vane model. Third, the actuator belongs to the CRB1 family configuration set that supports side or axial ports, multiple shaft styles, and optional switch arrangements through the broader product platform.
For commercial product pages, one clear way to describe the model is: SMC CRB1BW50-190S vane type pneumatic rotary actuator, 50 mm body size, 190° single vane, W double shaft, main body weight 788 g. That wording keeps the most important searchable attributes together and aligns with the official naming and specification logic.
Conclusion
The SMC CRB1BW50-190S is a compact vane-type rotary actuator built for applications that require 190-degree pneumatic rotation in a 50 mm body size. Official SMC data identifies it as a single-vane semi-standard angle model with W double-shaft construction, 0.15 to 1.0 MPa operating pressure, 0.082 J allowable kinetic energy, 250 N allowable radial load, 196 N allowable thrust load, and a main body weight of 788 g. For machinery that needs a little more than standard 180-degree movement without moving to a larger or more complex actuator platform, the CRB1BW50-190S is a technically sound and commercially practical choice.
