Harmonic Drive RSF-5B-100-US050-BC, Supermini Servo Actuator w/ 100:1 GearheadCondition:* New Old Stock, In OEM Packaging. As Pictured.Additional Notes:RSF-5B-100-US050-BC* Compact, lightweight* High positional accuracy* Size: 5B* Gear Ratio: 100:1* Encoder Type: Incremental encoder* Encoder Resolution: 500 line* Options: With Brake & Connectors* Rated Torque: 0.29 Nm (2.6 lb-in)* Rated Speed: 90 RPM* Stall Torque: 0.44 Nm (3.9 lb-in)* Maximum Torque: 0.9 Nm (8 lb-in)* Encoder Resolution: 100,000 counts/rev* One-way positioning accuracy: 180 arc/sec* Number of Poles: 8* Overall Length: 58.1mmCSF-5-100-2XH-J* Ratio: 100:1* Square flange type, shaft output* Average Torque Limite: 0.94 Nm* Max. Input Speed: 10,000 RPM* Limit for Avg. Input Speed: 6500 RPM* Shaft Dimensions (DxL): 5mm x 9mmHarmonic DriveRSF-5B-100-US050-BC