An actuator that combines design flexibility with reliable performance,
Introducing the BCSA V4.
Developed by Bonsystems, the BCSA V4 is a cycloidal-based robot actuator created with both simplified robot design and long-term operational reliability in mind. From smooth, powerful drive to efficient maintenance, it is built to deliver.
BCSA V4 360° Product Viewer
Product Specifications
- Product Specifications
| Model | Reduction Ratio | Outer Dimension(mm) | Thickness(mm) | Motor Input Voltage DC(V) | Motor Rated Current(A) | Motor Maximum Current(A) | Motor Rated Torque(Nm) | Motor Rated Input Speed(RPM) | Reducer Output Speed(RPM) | Rated Torque(Nm) | Peak Torque(Nm) | Backlash(arcmin) | Input Shaft Hollow Diameter(mm) | Offset Both LC(mm) | Weight(kg) |
| BCSA 070-019-I | 19 | 70 | 50 | 48 | 5.6 | 16.8 | 0.57 | 3,190 | 168 | 7 | 20 | 10 이하 | 7.4 | 5.5 | 0.68 |
| BCSA 070-029-I | 29 | 70 | 50 | 48 | 5.6 | 16.8 | 0.57 | 3,190 | 110 | 10 | 29 | 10 이하 | 7.4 | 5.5 | 0.68 |
| BCSA 070-039-I | 39 | 70 | 50 | 48 | 5.6 | 16.8 | 0.57 | 3,190 | 82 | 13 | 38 | 10 이하 | 7.4 | 5.5 | 0.68 |
| BCSA 070-049-I | 49 | 70 | 50 | 48 | 5.6 | 16.8 | 0.57 | 3,190 | 65 | 13 | 38 | 10 이하 | 7.4 | 5.5 | 0.68 |
| BCSA 087-019-I | 19 | 87 | 55 | 48 | 7.1 | 21 | 0.94 | 2,710 | 143 | 11 | 32 | 10 이하 | 10.4 | 5.5 | 1.14 |
| BCSA 087-029-I | 29 | 87 | 55 | 48 | 7.1 | 21 | 0.94 | 2,710 | 93 | 17 | 47 | 10 이하 | 10.4 | 5.5 | 1.14 |
| BCSA 087-039-I | 39 | 87 | 55 | 48 | 7.1 | 21 | 0.94 | 2,710 | 69 | 22 | 62 | 10 이하 | 10.4 | 5.5 | 1.14 |
| BCSA 087-049-I | 49 | 87 | 55 | 48 | 7.1 | 21 | 0.94 | 2,710 | 55 | 22 | 62 | 10 이하 | 10.4 | 5.5 | 1.14 |
| BCSA 096-019-I | 19 | 96 | 59.5 | 48 | 9.4 | 27.6 | 1.45 | 2,430 | 128 | 17 | 49 | 10 이하 | 15 | 5.5 | 1.59 |
| BCSA 096-029-I | 29 | 96 | 59.5 | 48 | 9.4 | 27.6 | 1.45 | 2,430 | 84 | 26 | 73 | 10 이하 | 15 | 5.5 | 1.59 |
| BCSA 096-039-I | 39 | 96 | 59.5 | 48 | 9.4 | 27.6 | 1.45 | 2,430 | 62 | 33 | 94 | 10 이하 | 15 | 5.5 | 1.59 |
| BCSA 096-049-I | 49 | 96 | 59.5 | 48 | 9.4 | 27.6 | 1.45 | 2,430 | 50 | 33 | 94 | 10 이하 | 15 | 5.5 | 1.59 |
※ Specification Update Date : 2026-02-05
- Motor Specifications
| Model | BCSA 070 | BCSA 087 | BCSA 096 |
| Motor Specifications | FA 60 (O.D 60, I.D 30 x 23) | FA 76 (O.D 76, I.D 38 x 24) | FA 85 (O.D 85, I.D 40.5 x 21.6) |
| Rated Voltage DC (V) | 48 | 48 | 48 |
| No-load Speed (RPM) | 5,064 | 3,912 | 2,960 |
| Rated Torque (Nm) | 0.57 | 0.94 | 1.45 |
| Rated Speed (RPM) | 3,190 | 2,710 | 2,430 |
| Rated Current (A) | 5.6 | 7.1 | 9.4 |
| Maximum Torque (Nm) | 1.63 | 2.68 | 4.1 |
| Peak Current (A) | 16.8 | 21 | 27.6 |
- Model Number Format
Product Introduction
A robot actuator from Bonsystems,
designed based on the real-world needs of engineers.
From flexible design to efficient operation and easy maintenance,
it delivers practical performance that makes a difference.
01
Separate motor and reducer design
The hassle of having to purchase new equipment every time the gear ratio or
motor specifications changed has been solved with a modular dedicated housing design.
By separating the motor and reducer into independent modules,
it is easy to produce customized actuators according to required specifications.
Only the module that needs servicing can be selectively detached,
enabling quick on-site maintenance and support.
02
Stronger housing, stronger structure
robot actuators must be heavy.
03
Less heat, longer life
A heat dissipation structure is applied to the housing to
quickly release heat generated during operation to the outside.
Prevents component damage and shortened lifespan caused by heat,
maintaining stable performance for a longer time.
04
Robot actuator specification customization
Provides the optimal gear ratio for
operating conditions without adding parts or changing the appearance.
05
Cross-roller bearings
Stronger durability compared to conventional ball bearings
Maintains stable rotation and torque transmission
even under high-load conditions.
Low backlash!
Reduced unnecessary gaps to minimize energy loss.
What should I do if I don't know the model name?
If you are unsure about the specifications of a model when making a purchase inquiry, please refer to the detailed specifications for each model on the product page before contacting us.
What information is required when inquiring about a product purchase?
Please include details about the intended application and desired specifications in your inquiry. Providing detailed information allows our team to recommend the most suitable product for your needs.
For reducer purchases, it is generally helpful to provide the model and specifications of the motor you are using (or plan to use), the intended application, and the required specifications.
Robot Hardware Development Services
Provide the specifications, applications, and purposes of your desired product, and Bonsystems Co., Ltd. will support you with robot design, engineering, and hardware manufacturing through the selection of our cutting-edge smart actuator (BCSA).
For detailed inquiries regarding development, please use the contact form below.
Is it possible to equip control components such as an encoder or drive?
Yes, it is possible. If you provide the required specifications or the product information you prefer, we can integrate them during the manufacturing process as a customized option. You may also specify partner products or particular brands, and we will reflect them accordingly.
What is the difference between the RO version and the RI version?
The RO version uses a frameless outer torque motor, which allows it to deliver high torque even with a slim profile. Thanks to this characteristic, it is well-suited for lower-body actuation of humanoid robots where weight support and strong power are essential.
The RI version, on the other hand, applies a frameless inrunner torque motor, which offers a smaller diameter and faster responsiveness. This makes it more suitable for arm actuation of humanoid robots where agile movement is required. Both products belong to the V4 Series, so you can select the most suitable version depending on the required torque, size, and application.
