The KST DS725MG HV Digital Coreless Servo is a standard-size HV coreless servo for 550 and 700 size RC helicopters and other high-speed control applications. KST describes it as a strong, fast workhorse servo for helicopter, precision aerobatic, and steering-style uses where the installation matches the servo rating. Verified KST data lists a DC 6.0V-8.4V voltage range, up to 18Kgf.cm stalling torque at 8.4V, and 0.07sec/60deg no-load speed at 8.4V. It uses a coreless DC motor, hardened steel gears, potentiometer feedback, aluminum alloy case, and 2 ball bearings. The 40.5 x 20 x 38mm case, 25T 6mm output spline, about 70g weight, and programmable soft start make DS725MG a practical HV servo option for mid-to-large RC platforms. Product Images Features 18Kgf.cm peak torque - Listed stalling torque reaches 18Kgf.cm at 8.4V. 0.07sec fast response - Listed no-load speed reaches 0.07sec/60deg at 8.4V. 550 and 700 helicopter focus - KST positions it for these RC helicopter sizes. Coreless DC motor - Supports smooth, fast servo response. Hardened steel gears - Adds strength for high-load control linkages. Aluminum alloy case - Provides a rigid standard-size housing. 25T 6mm output spline - Uses the listed spline for compatible horns. 2BB construction - Dual ball bearings support the output shaft. Programmable soft start - KST lists soft start and programmability. 100deg default travel - Default travel is listed as +/-50deg. Specifications Parameter Value Model KST DS725MG Shopify SKU KST-DS725MG Rated Voltage DC 7.4V Voltage Range DC 6.0V-8.4V Stalling Torque 13Kgf.cm @ 6.0V; 16Kgf.cm @ 7.4V; 18Kgf.cm @ 8.4V No-load Speed 0.09sec/60deg @ 6.0V; 0.08sec/60deg @ 7.4V; 0.07sec/60deg @ 8.4V Working Frequency 1520us / 333Hz Default Travel Angle +/-50deg = 100deg total Command Interface PWM command; pulse length 900us-2100us Output Shaft Spline 25T, 6mm Case Material Aluminum alloy Motor Type Coreless DC motor Gear Set Material Hardened steel Position Sensor Potentiometer Ball Bearing 2BB Case Dimensions 40.5 x 20 x 38mm +/-0.2mm Weight 70g +/-10% Temperature Range -10C to +65C Soft Start Programmable Programmable Yes Reference Documents KST DS725MG Technical Specification Application 550 and 700 size RC helicopters - KST positions it for compatible helicopter servo positions. Precision aerobatic models - Can be used where the servo size and output match the control surface load. Steering-style control applications - KST page text mentions steering-style use after fitment checks. HV receiver systems - Works within the listed DC 6.0V-8.4V range when powered correctly. Fast PWM control systems - Suitable for mechanisms using the listed 1520us/333Hz command format. Custom high-load mechanisms - Can be used in non-helicopter mechanisms after confirming load, voltage, signal, and travel. Packing List Description Quantity KST DS725MG coreless servo 1 Plastic servo horn 4 Servo horn screw 1 Grommet 4 Eyelet 4 Mounting screw 4 FAQ .faq-accordion details { border-bottom: 1px solid #e6eef8; padding: 14px 0; } .faq-accordion summary { list-style: none; cursor: pointer; font-size: 16px; font-weight: 700; color: #1f2933; position: relative; padding-right: 32px; } .faq-accordion summary::-webkit-details-marker { display: none; } .faq-accordion summary::after { content: "\203A"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%) rotate(90deg); color: #007fff; font-size: 28px; line-height: 1; transition: transform 0.2s ease; } .faq-accordion details[open] summary::after { transform: translateY(-50%) rotate(270deg); } .faq-accordion p { margin: 12px 0 0; color: #4b5563; line-height: 1.65; } How does DS725MG compare with BLS815? DS725MG is a coreless HV servo rated up to 18Kgf.cm at 8.4V, while BLS815 is a brushless servo rated up to 20Kgf.cm at 8.4V. Does OpenELAB list multiple Shopify variants for this product? No. The current Shopify product is a single variant with SKU KST-DS725MG. What is the maximum listed torque? The technical specification lists 18Kgf.cm at 8.4V. What is the fastest listed speed? The fastest listed no-load speed is 0.07sec/60deg at 8.4V. What voltage range does it support? The listed voltage range is DC 6.0V-8.4V. What is included in the package? KST lists one DS725MG coreless servo, four plastic servo horns, one servo horn screw, four grommets, four eyelets, and four mounting screws. What spline does it use? The technical specification lists a 25T, 6mm output shaft spline. What should I check before installation? Confirm the 40.5 x 20 x 38mm case, 25T 6mm spline, voltage range, and 1520us/333Hz signal setup.
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