INO-Lab HG-D251MG - Micro Servo

Specifications

Source: Most data comes from the manufacturer but some data is sourced from our loyal community.

Last Updated:	2025-08-10
Modulation:	Digital
Torque:	4.8V: 66.70 oz-in (4.80 kg-cm) 6.0V: 77.80 oz-in (5.60 kg-cm)
Speed:	4.8V: 0.15 sec/60° 6.0V: 0.12 sec/60°
Weight:	0.85 oz (24.0 g)
Dimensions:	Length:1.18 in (30.0 mm) Width:0.51 in (13.0 mm) Height:1.31 in (33.3 mm)
Motor Type:	Coreless
Gear Type:	Metal
Rotation/Support:	Single Bearing
Rotational Range:	(add)
Pulse Cycle:	(add)
Pulse Width:	(add)
Connector Type:	(add)

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The discontinued INO-Lab HG-D251MG is a high-performance digital mini servo that is a counterpart to the HG-D250MG, but with a focus on delivering a higher transit speed. While still featuring a durable all-metal gear (MG) train, its motor and digital controller are tuned for velocity. This makes it a specialized tool for agile models in the mini-servo class. The HG-D251MG is the premier choice for the tail rotor on a 500-class helicopter, where its incredible speed and precision result in a perfectly locked-in, professional-level tail. It is also an outstanding servo for the flight controls on a high-speed pylon racer or ducted fan jet.
The defining characteristic of the HG-D251MG is its digital velocity, backed by the assurance of a tough metal gearset. The digital controller provides an immediate, high-fidelity response, and the high-speed motor system translates those signals into movement with virtually no lag. For a competitive helicopter pilot or racer, this can provide a significant advantage, allowing for quicker corrections and more precise control at the limit.
In advanced robotics, the INO-Lab HG-D251MG is a superb actuator. Its combination of digital precision, high speed, and metal gear durability makes it ideal for building a fast and accurate robotic manipulator or a high-speed tracking system. For any robotics project where the dynamic response from a mini-sized servo is the most critical factor, the HG-D251MG offers a professional level of performance.