This is the HS-322HD Standard Heavy Duty Servo from Hitec. The HS-322HD Standard Heavy Duty Servo utilizes Hitec’s revolutionary Karbonite™ gear train which is four times stronger than Hitec's standard white nylon gears, and even after hundreds of thousands of cycles they don’t show any signs of wear. Karbonite™ gears and Hitec's custom IC makes the HS-322HD a great choice for an economical sport servo.
Transit time: 0.19 sec/ 60 deg. @ 4.8V (0.15 sec/deg @ 6V)
Torque: 41.6 oz/in @ 4.8V (51.3 oz/in @ 6V)
Weight: 43.0g (1.51 oz)
Length: 40mm (1.57")
Width: 20mm (0.78")
Height: 36.5mm (1.43")