42 oz/in.
The HS-311 is the perfect servo for inexpensive applications. Do not let the price fool you though, this servo features many of the same aspects of more expensive servos. One peice circuit board and tight mesh gears ensures great durability. Comes with a number of various servo horns and arms with mounting hardware.
Dimensions:1.57 x .78 x 1.43"

The HS-645MG is one of our favorite servos of all time. We use this servo for all types of applications. The reliability and performance that you get for under $46 is fantastic. Metal gears, dual ball bearings, separated motor and circuit board make the HS-645MG a top choice for rudder control and other heavy swing applications.
Dimensions:1.59 x .77 x 1.48"
133 oz/in.

Cast metal rudder arm with set screw drilled and tapped. Set screw is included.

Takes 1/8" rudder shaft
Over length: 1-3/16" (30mm)
Diameter (at the shaft insert): 1/2" (12mm)
Control rod hole diameter: 1/16" (1.5mm)

Cast metal rudder arm with set screw drilled and tapped. Set screw is included.

Takes 1/8" rudder shaft
Over length (from shaft insert to control rod end): 1-3/16" (30mm)
Width (looking at it as a "V"): 1-7/16" (37mm)
Diameter (at the shaft insert): 1/2" (12mm)
Control rod hole diameter: 1/16" (1.5mm)

Cast metal rudder arm with set screw drilled and tapped. Set screw is included.

Takes 3/16" rudder shaft
Over length (from shaft insert to control rod end): 1-3/16" (30mm)
Width (looking at it as a "V"): 1-7/16" (37mm)
Diameter (at the shaft insert): 1/2" (12mm)
Control rod hole diameter: 1/16" (1.5mm)

Cast metal rudder arm with set screw drilled and tapped. Set screw is included.

Takes 3/16" rudder shaft
Over length: 1-3/16" (30mm)
Diameter (at the shaft insert): 1/2" (12mm)
Control rod hole diameter: 1/16" (1.5mm)

2/Pack
Rod dimesions:
12" Long
4-40 Thread

Hard steel construction

Thread: 4-40
2/Pack

Thread: 4-40
12" long
1/Pack