Most commonly used over at our side of the globe is the Sanwa(Airtonics) ERG-VB/ZB, for it's high torque & reliability.
It would be advisable to take note & avoid the below servo at all cost. Was rather apprehensive about the too good to believe price & specs., so to find out how good you have to try it first right ?. We bought a few pieces & 1 of them failed within a 7 mins heat runtime. Turn it on & you hear the so-called 'digital chattering'. Steer left or right 'full lock' & the servo horn moves to the end & instead of stopping at the end point, it moves back & forth 2 ~ 3 mm a few times before it stops. Same thing happened when used on the throttle(as a bonus you get ABS braking effect
). We have dumped the rest aside.
TOWER PRO MG-945
(METAL GEAR SERVO)
13 kg Torque
Size : 40.6mmx19.8mmx37.8mm
Weight : 55.2g
Stall torque:13.0kg/cm (6.0V)
Temperature Range:-20 degree to 60 Deg
Dead band width:4usec
Structure Feature: 3 pole ferrite, dual ball bearing, 3 metal gears and 1 Resin metal gear, connector wire length: 32cm
Just remember :- 'Good things no cheap, cheap things no good !'.