SITO DRIVE CS Mini-2.5 50:1 Harmonic Reducer – 11mm, 5.9g for Robotic Finger Joints
SITO DRIVE CS Mini-2.5 50:1 Harmonic Reducer – 11mm, 5.9g for Robotic Finger Joints
SITO DRIVE
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Miniature Strain-Wave Reducer for Dexterous Robot Hands
The SITO DRIVE CS Mini-2.5 (CS-2.5) is a compact harmonic reducer intended for robotic finger joints and space-constrained precision mechanisms. The offered configuration is one standalone reducer with a 50:1 reduction ratio. A motor, driver, encoder and robot hand are not included.
The supplier emphasizes a compact structure, high precision, high rigidity, low noise, high torque density and fast response for fine grasping movements. These are supplier descriptions; performance depends on the complete mechanism, motor and control system.
50:1 Model Specifications
| Parameter | 50:1 configuration offered |
|---|---|
| Brand | SITO DRIVE (Xintuo) |
| Model | CS Mini-2.5 / CS-2.5 |
| Reduction ratio | 50:1 |
| Nominal diameter | 11 mm |
| Overall axial length shown in the source | 17.4 mm, including the projecting shaft |
| Weight | 5.9 g, supplier specification |
| Rated torque at 2,000 rpm input | 0.10 N·m |
| Permissible peak torque at start/stop | 0.21 N·m |
| Maximum permissible average load torque | 0.13 N·m |
| Momentary maximum permissible torque | 0.40 N·m |
| Maximum permissible input speed | 7,000 rpm |
| Permissible average input speed | 3,500 rpm |
| Backlash | ≤20 arcsec |
| Rotational inertia | No value supplied in the source table |
The torque categories above are distinct: the momentary maximum is not a continuous operating rating. Input-speed limits are not output-speed ratings. Operating temperature, efficiency, noise level in dB, lubrication procedure and radial/axial load limits are not specified in the supplied material.
Mounting Dimensions
| Drawing callout | Value |
|---|---|
| Outer diameter | Ø11 mm, tolerance +0/−0.03 mm |
| Shaft diameter | Ø2.50 mm, tolerance +0/−0.02 mm |
| Axial segments shown | 7.2 mm + 8.20 mm + 2 mm = 17.4 mm |
| Mounting thread | M10.3 × 0.25 |
| Units | Millimetres; refer to the English drawing in Details |
The source heading describes 17.4 mm as thickness, while the dimension photo and segmented drawing show the overall axial span including the shaft. Confirm the mating interface and clearance using the drawing. Do not infer screw sizes or unlabelled tolerances from the photographs.
30:1 Model — Reference Only
The supplier parameter image also includes the following 30:1 data. This ratio is not offered by the source SKU and is not included as a purchase option here.
| Parameter | 30:1 reference |
|---|---|
| Rated torque at 2,000 rpm input | 0.06 N·m |
| Permissible peak torque at start/stop | 0.13 N·m |
| Maximum permissible average load torque | 0.10 N·m |
| Momentary maximum permissible torque | 0.21 N·m |
| Maximum permissible input speed | 7,000 rpm |
| Permissible average input speed | 3,500 rpm |
| Backlash | ≤20 arcsec |
| Rotational inertia | Not specified |
The source also prints 80, 100 and 120 ratio headings but leaves their parameter cells blank. No specifications or availability are inferred for those ratios.
Supplier Application Comparison
The supplier describes compact integration into finger joints, repeatable fine grasping, high torque density, low inertia and reduced wear as advantages for dexterous hands. Its promotional comparison with miniature roller screws is reproduced below for context. These are general application claims, not independently tested CS Mini-2.5 specifications; the two accuracy figures use different quantities and units.
| Comparison in supplier material | Miniature harmonic reducer | Miniature roller screw |
|---|---|---|
| Accuracy | ≤0.005° repeat positioning | 0.05 mm linear accuracy |
| Torque density | 150–200 N·m/kg | 30–50 N·m/kg |
| Packaging | Integrated into the finger joint | Additional guide mechanism occupies space |
| Dynamic response | 10 ms class; low inertia | 50 ms class; friction lag |
| Life at full load | 500,000 cycles; described as maintenance-free | 200,000 cycles; periodic lubrication |
| Structural design | Simplified assembly and fewer failure points | Relatively more complex assembly |
| Production cost/value | Supplier claims broadly comparable value in volume production | Comparison baseline |
The supplier comparison favors harmonic reduction on its first six criteria, but provides no test conditions. Its 150–200 N·m/kg statement is not a model-specific torque-to-weight calculation. The ≤0.005° repeat-positioning claim and ≤20 arcsec backlash specification describe different properties and should not be substituted for each other.
Package Contents
1 × SITO DRIVE CS Mini-2.5 standalone harmonic reducer, 50:1 ratio. Motors, actuators, controllers, robot hands and other CS Mini series sizes shown in application imagery are not included.
Details
English versions of the supplier illustrations, with explanations and series-specific reference notes.
Mounting Drawing and Performance Table
English translation of the source Gallery specification sheet. Only the 50:1 standalone reducer is offered. The 30:1 column is reference only; 80, 100 and 120 columns have no supplied data. Dimensions and tolerances are in millimetres.
Overall Size Reference
The source illustrates an 11mm diameter and 17.4mm overall axial span including the shaft. Refer to the installation drawing for the 7.2mm, 8.20mm and 2mm axial segments.
