Hitec HS-322HD - Standard Heavy Duty Servo

Specifications

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

Last Updated:	2025-10-21
Modulation:	Analog
Size Class:	Standard
Torque:	4.8V: 42.00 oz-in (3.02 kg-cm) 6.0V: 51.00 oz-in (3.67 kg-cm)
Speed:	4.8V: 0.19 sec/60° 6.0V: 0.15 sec/60°
Weight:	1.52 oz (43.0 g)
Dimensions:	Length:1.57 in (39.9 mm) Width:0.78 in (19.8 mm) Height:1.43 in (36.3 mm)
Motor Type:	3-pole
Gear Type:	Plastic
Rotation/Support:	Bushing
Rotational Range:	(add)
Pulse Cycle:	20 ms
Pulse Width:	900-2100 µs
Connector Type:	(add)

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The Hitec HS-322HD is a heavy-duty variant of a standard servo design, specifically engineered for increased torque capability in demanding standard applications and challenging mechanical scenarios. Its enhanced power delivery reliably handles tougher tasks and increased loading conditions.
Particularly suited for larger control surface applications, heavier models, and robust mechanisms requiring additional capability, it provides extra mechanical authority where standard power levels prove insufficient. The HD designation accurately signifies strengthened performance characteristics and enhanced capability.
It effectively bridges the performance gap between standard and high-power requirements in versatile setups and applications, offering users enhanced capability without requiring complete system redesign or specialized component integration for moderate performance increases."

alexM

March 8, 2016

Rating:

Application(s): Light robotics

Comments: Allegedly 'heavy duty', with 'Karbonite' gears -- BUT both descriptors are misleading. Has 2 Karbonite and 2 nylon gears and in light use they both break easily. It's not a heavy duty servo by any means.
With a full range of input pulse widths, 544-2400 uS., its rotational range is ~190 deg. With more usual RC input range of 900-2100 uS. it will output ~155 deg. of rotation.
JBruce

July 8, 2010

Rating:

Application(s): used as leg servos in a small hexapod robot, 3 dof per leg.

Comments: I would absolutely not recommend these for robotic applications or anything that experiences high mechanical shock. The resin gears do not stand up to the stress of walking impact. I've had 3 of these fail in the last month.
Great for low stress areas but they cannot handle any shock,
do not fall for resin gear advertisement.
jason.hodge

November 7, 2009

Rating:

Application(s): 4 Channel R/C Aircraft - 4.8V

Comments: I had 1, maybe 2 of these brand new servo's fail on my aircraft's maiden flight. All things tested fine on the ground, but one of them, mainly the elevator servo, failed during flight. I had to send all 4 in the plane to Hitec for service. I sent 4 more that I purchased, back to the dealer for upgrade to Futaba 3004's. No more Hitec for me!