{"product_id":"sito-drive-cs-mini-2-5-50-1-harmonic-reducer","title":"SITO DRIVE CS Mini-2.5 50:1 Harmonic Reducer – 11mm, 5.9g for Robotic Finger Joints","description":"\u003ch2\u003eMiniature Strain-Wave Reducer for Dexterous Robot Hands\u003c\/h2\u003e\u003cp\u003eThe \u003ca href=\"https:\/\/rcdrone.top\/collections\/sito-drive\" title=\"SITO DRIVE\"\u003eSITO DRIVE\u003c\/a\u003e CS Mini-2.5 (CS-2.5) is a compact harmonic reducer intended for \u003ca href=\"https:\/\/rcdrone.top\/collections\/robotics\" title=\"Robotics\"\u003erobotic\u003c\/a\u003e 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.\u003c\/p\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003ch2\u003e50:1 Model Specifications\u003c\/h2\u003e\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable style=\"border-collapse:collapse;width:100%\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"border:1px solid #ddd;padding:8px\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:8px\"\u003e50:1 configuration offered\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eSITO DRIVE (Xintuo)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eCS Mini-2.5 \/ CS-2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eReduction ratio\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e50:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eNominal diameter\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e11 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eOverall axial length shown in the source\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e17.4 mm, including the projecting shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e5.9 g, supplier specification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eRated torque at 2,000 rpm input\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e0.10 N·m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003ePermissible peak torque at start\/stop\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e0.21 N·m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eMaximum permissible average load torque\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e0.13 N·m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eMomentary maximum permissible torque\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e0.40 N·m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eMaximum permissible input speed\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e7,000 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003ePermissible average input speed\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e3,500 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eBacklash\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e≤20 arcsec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eRotational inertia\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eNo value supplied in the source table\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003ch2\u003eMounting Dimensions\u003c\/h2\u003e\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable style=\"border-collapse:collapse;width:100%\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"border:1px solid #ddd;padding:8px\"\u003eDrawing callout\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:8px\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eOuter diameter\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eØ11 mm, tolerance +0\/−0.03 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eShaft diameter\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eØ2.50 mm, tolerance +0\/−0.02 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eAxial segments shown\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e7.2 mm + 8.20 mm + 2 mm = 17.4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eMounting thread\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eM10.3 × 0.25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eUnits\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eMillimetres; refer to the English drawing in Details\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003ch2\u003e30:1 Model — Reference Only\u003c\/h2\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable style=\"border-collapse:collapse;width:100%\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"border:1px solid #ddd;padding:8px\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:8px\"\u003e30:1 reference\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eRated torque at 2,000 rpm input\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e0.06 N·m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003ePermissible peak torque at start\/stop\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e0.13 N·m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eMaximum permissible average load torque\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e0.10 N·m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eMomentary maximum permissible torque\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e0.21 N·m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eMaximum permissible input speed\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e7,000 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003ePermissible average input speed\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e3,500 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eBacklash\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e≤20 arcsec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eRotational inertia\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003cp\u003eThe source also prints 80, 100 and 120 ratio headings but leaves their parameter cells blank. No specifications or availability are inferred for those ratios.\u003c\/p\u003e\u003ch2\u003eSupplier Application Comparison\u003c\/h2\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable style=\"border-collapse:collapse;width:100%\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"border:1px solid #ddd;padding:8px\"\u003eComparison in supplier material\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:8px\"\u003eMiniature harmonic reducer\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:8px\"\u003eMiniature roller screw\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eAccuracy\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e≤0.005° repeat positioning\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e0.05 mm linear accuracy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eTorque density\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e150–200 N·m\/kg\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e30–50 N·m\/kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003ePackaging\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eIntegrated into the finger joint\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eAdditional guide mechanism occupies space\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eDynamic response\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e10 ms class; low inertia\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e50 ms class; friction lag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eLife at full load\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e500,000 cycles; described as maintenance-free\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e200,000 cycles; periodic lubrication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eStructural design\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eSimplified assembly and fewer failure points\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eRelatively more complex assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eProduction cost\/value\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eSupplier claims broadly comparable value in volume production\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003eComparison baseline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003ch2\u003ePackage Contents\u003c\/h2\u003e\u003cp\u003e1 × 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.\u003c\/p\u003e\u003csection id=\"english-image-details\"\u003e\u003ch2\u003eDetails\u003c\/h2\u003e\n\u003cp\u003eEnglish versions of the supplier illustrations, with explanations and series-specific reference notes.\u003c\/p\u003e\n\u003ch3\u003eMounting Drawing and Performance Table\u003c\/h3\u003e\n\u003cp\u003eEnglish 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.\u003c\/p\u003e\n\u003cfigure style=\"margin:20px 0\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0643\/3210\/3904\/files\/sito-cs25-68-7-detail01-en.png?v=1791295560\" target=\"_blank\" rel=\"noopener\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0643\/3210\/3904\/files\/sito-cs25-68-7-detail01-en.png?v=1791295560\" alt=\"SITO DRIVE CS Mini-2.5: Mounting Drawing and Performance Table (English)\" width=\"1254\" height=\"1254\" loading=\"lazy\" style=\"display:block;max-width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eMounting Drawing and Performance Table — English reference illustration.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003ch3\u003eOverall Size Reference\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cfigure style=\"margin:20px 0\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0643\/3210\/3904\/files\/sito-cs25-68-7-detail02-en.png?v=1791295576\" target=\"_blank\" rel=\"noopener\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0643\/3210\/3904\/files\/sito-cs25-68-7-detail02-en.png?v=1791295576\" alt=\"SITO DRIVE CS Mini-2.5: Overall Size Reference (English)\" width=\"1254\" height=\"1254\" loading=\"lazy\" style=\"display:block;max-width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eOverall Size Reference — English reference illustration.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003c\/section\u003e","brand":"SITO DRIVE","offers":[{"title":"Reducer Only - 50:1","offer_id":67754227728608,"sku":"CS-2.5-50-1","price":198.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/3210\/3904\/files\/ScreenShot_2026-10-06_222043_887.png?v=1791296525","url":"https:\/\/rcdrone.top\/pl\/products\/sito-drive-cs-mini-2-5-50-1-harmonic-reducer","provider":"RCDrone","version":"1.0","type":"link"}