GWS S666NF/2BB - Heavy Duty Servo

Specifications

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

Last Updated:	2025-08-07
Modulation:	Analog
Torque:	4.8V: 257.00 oz-in (18.51 kg-cm) 6.0V: 313.00 oz-in (22.54 kg-cm)
Speed:	4.8V: 0.19 sec/60° 6.0V: 0.16 sec/60°
Weight:	5.64 oz (159.9 g)
Dimensions:	Length:2.48 in (63.0 mm) Width:1.26 in (32.0 mm) Height:2.43 in (61.7 mm)
Motor Type:	(add)
Gear Type:	Hybrid
Rotation/Support:	Dual Bearings
Rotational Range:	(add)
Pulse Cycle:	(add)
Pulse Width:	(add)
Connector Type:	(add)

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The discontinued GWS S666NF/2BB is a high-performance servo that combines a ""Narrow"" deadband for precision, a ""Fast"" (F) gear train, and a dual ball bearing (2BB) supported output shaft. This standard-sized servo is a specialized tool for competitive applications where a rapid and precise response is paramount. It is a premier choice for tail rotor control on large .50 and .60 size helicopters, where its speed and precision allow for a very stable, high-performance tail. It is also an excellent steering servo for 1/10 scale on-road racing cars, where its immediate and accurate response allows for lightning-fast directional changes.
The defining characteristic of the S666NF/2BB is its refined speed. It doesn't just move quickly; it moves with a precision and smoothness that is characteristic of a high-end, competition-focused servo. This is often achieved through the use of high-quality components like a coreless motor. The result is a servo that feels incredibly responsive yet very precise, giving competitors a tangible performance edge.
For roboticists, the S666NF/2BB is an excellent choice for tasks that require a combination of high speed and high precision. It would be ideal for a high-speed vision-guided tracking system or for the joints of a very fast robotic arm. For any robotics application where both rapid movement and accurate, repeatable positioning are critical, the S666NF/2BB provides a superior level of performance."