The KST BLS159 Low Profile Brushless HV Digital Servo is a low-profile HV servo for RC car applications such as 1/10 scale buggy and drift-car steering. KST lists it with a CNC aluminum case, hardened steel gears, and a brushless DC motor. Verified KST data lists a DC 6.0V-8.4V voltage range, 15Kgf.cm stalling torque at 7.4V, and 0.11sec/60deg no-load speed at 7.4V. It uses 1520us/333Hz PWM control, potentiometer feedback, and 2 ball bearings. The 40 x 20 x 26.5mm low-profile case and 55g listed weight make BLS159 a compact steering-servo option when a standard-height servo will not fit. Product Images Features 15Kgf.cm stalling torque - Listed stalling torque is 15Kgf.cm at 7.4V. 0.11sec no-load speed - Listed no-load speed is 0.11sec/60deg at 7.4V. Low-profile case - 26.5mm case height fits low-profile servo slots. Brushless DC motor - Supports efficient steering response. Hardened steel gears - Adds drivetrain durability for steering loads. CNC aluminum case - Provides a rigid compact housing. 2BB construction - Dual ball bearings support the output shaft. Programmable soft start - KST lists soft start as programmable. 25T 6mm spline - Output shaft spline is listed in the technical PDF. RC car focus - KST positions it for buggy, drift, and other low-profile steering applications. Specifications Parameter Value Model KST BLS159 Shopify SKU KST-BLS159 Rated Voltage DC7.4V Voltage Range DC6.0V-8.4V Stalling Torque 15Kgf.cm @ 7.4V Rated Torque 4Kgf.cm @ 7.4V Stalling Current 3.85A Rated Current 0.65A No-load Speed 0.11sec/60deg @ 7.4V Rated Speed 0.15sec/60deg @ 7.4V Working Frequency 1520us / 333Hz Default Travel Angle +/-50deg = 100deg total Output Shaft Spline 25T, 6mm Case Material Aluminum alloy Motor Type Brushless DC motor Gear Set Material Hardened steel Position Sensor Potentiometer Ball Bearing 2BB Case Dimensions 40 x 20 x 26.5mm +/-0.2mm Weight 55g +/-10% Temperature Range -10C to +65C Reference Documents KST BLS159 Technical Specification Application 1/10 scale buggy steering - KST positions BLS159 for 2WD and 4WD buggy applications. 1/10 scale drift cars - Low-profile size supports steering installations with limited height. RC car steering - Suitable for compatible steering systems after checking case size, spline, torque, and speed. RC crawler builds - Useful where metal gearing and high torque are required for steering load. RC boats and wet models - Applicable only for products with a listed waterproof rating that matches the use case. HV receiver and BEC systems - Works within the listed voltage range when the power supply can handle current draw. Custom PWM motion projects - Can be used in hobby robotics or prototypes after validating duty cycle and cooling. Packing List Description Quantity KST BLS159 V8.0 brushless HV servo 1 Accessory pack 1 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 BLS159 compare with BLS88WP? BLS159 is a low-profile RC car servo rated 15Kgf.cm at 7.4V. BLS88WP is a smaller waterproof micro servo rated up to 8.5Kgf.cm at 8.4V and IP67. Does OpenELAB list multiple Shopify variants for this product? No. The current Shopify product is a single variant with SKU KST-BLS159. What is the maximum listed torque? KST lists 15Kgf.cm at 7.4V. What is the listed speed? The listed no-load speed is 0.11sec/60deg at 7.4V. Is it waterproof? KST's BLS159 specification used here does not list an IP waterproof rating, so it should not be treated as waterproof. What spline does it use? The technical PDF lists a 25T, 6mm output shaft spline. What is included in the package? KST lists one BLS159 V8.0 brushless HV servo and one accessory pack. What should I check before installation? Confirm low-profile case fit, 25T 6mm spline, DC6.0V-8.4V power, and steering linkage clearance.
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