KO Propo PS-2123 FET - Digital Power Servo

Specifications

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

Last Updated:	2025-08-11
Modulation:	Digital
Torque:	7.2V: 131.70 oz-in (9.48 kg-cm)
Speed:	7.2V: 0.06 sec/60°
Weight:	1.90 oz (53.9 g)
Dimensions:	Length:1.50 in (38.1 mm) Width:0.80 in (20.3 mm) Height:1.60 in (40.6 mm)
Motor Type:	Coreless
Gear Type:	Metal
Rotation/Support:	Dual Bearings
Rotational Range:	(add)
Pulse Cycle:	(add)
Pulse Width:	(add)
Connector Type:	(add)

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The discontinued KO Propo PS-2123 FET is a legendary, high-performance digital servo that has been a benchmark for competitive RC racing for years. As part of the "Professional Servo" (PS) line, it is engineered for the highest levels of performance. Its key technological feature is the use of a Field-Effect Transistor (FET) amplifier, which allows for dramatically higher current throughput compared to standard servos. This results in a servo with incredibly powerful holding torque and a lightning-fast response time. The PS-2123 is a torque-focused model, making it the premier choice for steering on 1/8 scale off-road buggies and truggies, where its immense power can handle the toughest conditions.
The character of the PS-2123 FET is its raw, unbridled digital power. For a competitive racer, the FET advantage is tangible, providing an incredibly direct and forceful connection to the vehicle's steering. It has the strength to hold a perfect line through a rutted, high-traction corner without yielding. It is a true classic, an instrument of power and precision that has been trusted by a generation of top-level racers.
In robotics, the PS-2123 FET's high power and robust construction make it an outstanding choice for demanding applications. It is ideal for the joints of a large, heavy combat robot or for a robotic manipulator that needs to apply a very high and consistent force.

Gazla

June 8, 2024

Rating:

Application(s): Hi IV had this servo for about 15 years Iv only just got back into racing and bought a 1/10 touring car and thought ill use my 2123 servo It works perfectly but I can't find any servo horns that fit Iv tried a lot of different sizes and nothing fits I bought a 25t servo saver but still to small. Gutted

Comments: It's the best servo money can buy