Servo # Description Weight Dimensions
(W x L x H)		 Torque Speed Motor/ Bearings
Street Price
 Notes
241 Sub Micro 0.32 oz
(9.1 g)		 0.45 x 0.87 x 0.85 in
(11 x 22 x 22 mm)		 17 oz-in
(1.22 kg-cm)		 0.18 sec
@ 60 deg		 3-Pole Ferrite, Standard Bushings
$27.95
 slow fly, hlg
Z250 Standard Race 1.47 oz
(41.7 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 49 oz-in
(3.5 kg-cm)		 0.19 sec
@ 60 deg		 3-Pole Ferrite, metal gears, standard bushings
-?-
  
321 Micro BB 0.77 oz
(21.9 g)		 0.58 x 1.30 x 1.02 in
(15 x 33 x 26 mm)		 29.7 oz-in
(2.1 kg-cm)		 0.23 sec
@ 60 deg		 5-Pole Ferrite, Single Ball Bearing
$52.95
  
331 Micro 0.63 oz
(17.9 g)		 0.50 x 1.12 x 1.17 in
(13 x 28 x 30 mm)		 42.2 oz-in
(3.0 kg-cm)		 0.23 sec
@ 60 deg		 3-Pole Ferrite, No Bearings
$27.95
  
341 Micro 0.63 oz
(17.9 g)		 0.50 x 1.12 x 1.17 in
(13 x 28 x 30 mm)		 31.9 oz-in
(2.3 kg-cm)		 0.24 sec
@ 60 deg		 5-Pole Ferrite, No Bearings
$36.95
  
351 Micro Metal Geared 0.88 oz
(25.0 g)		 0.50 x 1.12 x 1.17 in
(13 x 28 x 30 mm)		 31.9 oz-in
(2.3 kg-cm)		 0.24 sec
@ 60 deg		 5-Pole Ferrite, metal gears, No Bearings
$64.95
  
507 Standard 1.47 oz
(41.7 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 40.3 oz-in
(2.9 kg-cm)		 0.22 sec
@ 60 deg		 3-Pole Ferrite
-?-
  
513 Standard Retract 1.72 oz
(48.8 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 67 oz-in
(4.8 kg-cm)		 1.25 sec
@ 60 deg		 5-pole ferrite, Single Ball Bearing
$32.95
  
517 Standard Ball Bearing 1.58 oz
(44.9 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 40.3 oz-in
(2.9 kg-cm)		 0.25 sec
@ 60 deg		 3-Pole Ferrite
-?-
  
527 Standard Sport 1.47 oz
(41.7 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 40.3 oz-in
(2.9 kg-cm)		 0.25 sec
@ 60 deg		 3-pole ferrite, No Bearings
$17.95
  
531 Premium Sport 1.50 oz
(42.6 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 51 oz-in
(3.7 kg-cm)		 0.21 sec
@ 60 deg		 3-pole ferrite, Single Ball Bearing
$39.95
  
537 Standard Sport BB 1.58 oz
(44.9 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 43 oz-in
(3.1 kg-cm)		 0.25 sec
@ 60 deg		 3-pole ferrite, Single Ball Bearing
$26.95
 heli and sport use
Z550 Premium race 1.5 oz
(42.6 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 60 oz-in
(4.5 kg-cm)		 0.09 sec
@ 60 deg		 3-Pole Ferrite
$34.95
  
Z590M ** Torque race servo xx oz
(xx g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 70 oz-in
(5.1 kg-cm)		 xx sec
@ 60 deg		 3-Pole Ferrite, metal gears
$34.95
  
605 Monster FET 4.75 oz
(134.9 g)		 1.26 x 2.50 x 2.30 in
(32 x 64 x 58 mm)		 139.1 oz-in
(10.0 kg-cm)		 0.28 sec
@ 60 deg		 Cored Motor, Dual Bearings
$99.95
  
615 Ultra Torque Monster FET 5.12 oz
(145.4 g)		 1.26 x 2.50 x 2.30 in
(32 x 64 x 58 mm)		 181 oz-in
(13.1 kg-cm)		 0.19 sec
@ 60 deg		 Coreless, Dual Ball Bearings
$99.95
  
703 Low Profile Retract 1.16 oz
(32.9 g)		 0.88 x 1.73 x 0.93 in
(22 x 44 x 24 mm)		 93.2 oz-in
(6.7 kg-cm)		 1.36 sec
@ 60 deg		 Cored, Dual Ball Bearings, 160 deg
$89.95/$62.95
  
911 Mid Size Low Profile BB 1.13 oz
(32.1 g)		 0.71 x 1.41 x 1.03 in
(18 x 36 x 26 mm)		 43.1 oz-in
(3.1 kg-cm)		 0.27 sec
@ 60 deg		 5 pole ferrite, Dual Ball Bearings
$52.95
  
2700G Precision Hi-Speed 2.0 oz
(56.8 g)		 0.73 x 1.29 x 1.52 in
(19 x 33 x 39 mm)		 49 oz-in
(3.5 kg-cm)		 0.11 sec
@ 60 deg		 Raced, Dual Ball Bearing
$89.95
  
2721 Ultra-Torque Alloy 1.84 oz
(52.3 g)		 0.73 x 1.29 x 1.32 in
(19 x 33 x 34 mm)		 116 oz-in
(8.4 kg-cm)		 0.18 sec
@ 60 deg		 Coreless, Dual Ball Bearing
$139.95/$99.95
 comparable to 4721 with better gearing
Z2750 Super Race 2.0 oz
(56.8 g)		 0.73 x 1.52 x 1.29 in
(19 x 39 x 33 mm)		 62.0 oz-in
(4.5 kg-cm)		 0.17 sec
@ 60 deg		 Coreless, Dual Bearings
$124.95
  
3021 Mini 0.84 oz
(24.0 g)		 0.58 x 1.30 x 1.02 in
(15 x 33 x 26 mm)		 37.5 oz-in
(2.7 kg-cm)		 0.22 sec
@ 60 deg		 Coreless, Dual Bearings
-?-
  
3025 Ultra Speed 0.95 oz
(27.0 g)		 0.58 x 1.30 x 1.02 in
(15 x 33 x 26 mm)		 29.2 oz-in
(2.1 kg-cm)		 0.15 Coreless, Dual Bearings
$62.95
  
3121 Mini High Speed 0.84 oz
(24.0 g)		 0.58 x 1.30 x 1.02 in
(15 x 33 x 26 mm)		 46.4 oz-in
(3.3 kg-cm)		 0.17 sec
@ 60 deg		 Coreless, Dual Ball Bearings
$69.95
  
3321 Wing Ball Bearing Servo 0.95 oz
(27.0 g)		 0.58 x 1.30 x 1.30 in
(15 x 33 x 33 mm)		 59.8 oz-in
(4.3 kg-cm)		 0.36 sec
@ 60 deg		 Coreless, Dual Bearings
$74.95
 glider wings
Z3550 Mini Race 1.61 oz
(45.7 g)		 0.58 x 1.30 x 1.02 in
(15 x 33 x 26 mm)		 38 oz-in
(2.7 kg-cm)		 0.11 sec
@ 60 deg		 Coreless, Dual Bearings
$84.95
  
4000 Super Servo 1.76 oz
(50.0 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 73.6 oz-in
(5.3 kg-cm)		 0.17 sec
@ 60 deg		 Coreless, Dual Bearings
$124.95
  
4131 Ultra Precision 1.50 oz
(42.6 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 90.4 oz-in
(6.5 kg-cm)		 0.23 sec
@ 60 deg		 Coreless, Dual Ball Bearings
$79.95
  
4721 Ultra Torque 1.72 oz
(48.8 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 119.6 oz-in
(8.6 kg-cm)		 0.22 sec
@ 60 deg		 Coreless, Dual Ball Bearings
$84.95
  
4735 Ultra Speed 1.72 oz
(48.8 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 90.0 oz-in
(6.5 kg-cm)		 0.15 sec
@ 60 deg		 Coreless, Dual Ball Bearings
$84.95
 good for race cars
Z4750 Ultra Race Servo 1.72 oz
(48.8 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 96 oz-in
(6.9 kg-cm)		 0.12 sec
@ 60 deg		 Coreless, Dual Bearings
$84.95
  
7005 Low Profile High Speed 1.31 oz
(37.2 g)		 0.88 x 1.73 x 0.93 in
(22 x 44 x 24 mm)		 62.6 oz-in
(4.5 kg-cm)		 0.19 sec
@ 60 deg		 Coreless, Dual Ball Bearings
$89.95
  
7100 Low Profile Super 1.31 oz
(37.2 g)		 0.88 x 1.73 x 0.93 in
(22 x 44 x 24 mm)		 60.5 oz-in
(4.4 kg-cm)		 0.19 sec
@ 60 deg		 Coreless, Dual Ball Bearings
$124.95
  
8101 Ultra Precision 1.73 oz
(49.1 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 90.4 oz-in
(6.5 kg-cm)		 0.23 sec
@ 60 deg		 Coreless, Dual Ball Bearings, 160 deg
$74.95
  
8700G High Speed Super S 2.11 oz
(59.9 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 49.9 oz-in
(3.6 kg-cm)		 0.09 sec
@ 60 deg		 Coreless, Dual Ball Bearings (wide spaced)
$129.95
 PCM only
9011 Mid Size 1.31 oz
(37.2 g)		 0.75 x 1.04 x 1.42 in
(19 x 26 x 36 mm)		 60.6 oz-in
(4.4 kg-cm)		 0.21 sec
@ 60 deg		 Coreless, Dual Ball Bearings
$62.95
  
DS368 Digital Servo 0.80 oz
(22.7 g)		 0.50 x 1.12 x 1.17 in
(13 x 28 x 30 mm)		 53 oz-in
(3.8 kg-cm)		 0.21 sec
@ 60 deg		 Cored, metal gears, No Bearings
$69.95
  
DS811 Digital Advanced Sport 1.44 oz
(40.9 g)		 0.75 x 1.49 x 1.52 in
(19 x 38 x 39 mm)		 54/66 oz-in
(3.9/4.8 kg-cm)		 0.18/0.15 sec
@ 60 deg		 Cored, plastic gears, Single ball bearing
$47.99
  
DS3301 Digital Wing Servo 1.00 oz
(28.4 g)		 0.58 x 1.30 x 1.30 in
(15 x 33 x 33 mm)		 56 oz-in
(4.0 kg-cm)		 0.22 sec
@ 60 deg		 Coreless, nylon gears, Dual Ball Bearings
$89.95
  
DS3421 Digital High Speed 1.04 oz
(29.5 g)		 0.58 x 1.30 x 1.02 in
(15 x 33 x 26 mm)		 65 oz-in
(4.7 kg-cm)		 0.18 sec
@ 60 deg		 Coreless, Dual Ball Bearings
$84.95
 not for gyro usage, use DS9411
DS8231 Digital Ultra Precision 1.76 oz
(50.0 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 88 oz-in
(6.4 kg-cm)		 0.22 sec
@ 60 deg		 Coreless, nylon gears, Dual Ball Bearings
$129.95/$99.95
 comparable to JR4131
DS8411 Digital Servo 2.03 oz
(57.7 g)		 0.73 x 1.54 x 1.32 in
(19 x 39 x 34 mm)		 155 oz-in
(11.2 kg-cm)		 0.18 sec
@ 60 deg		 Coreless, Dual Ball Bearings (wide spaced)
$159.95/$114.95
  
DS8417 ** Digital High Speed 2.03 oz
(57.7 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 xx oz-in
(xx kg-cm)		 0.10 sec
@ 60 deg		 Coreless, alloy gears, Dual Ball Bearings (wide spaced)
$159.95/$114.95
 tail rotor use
DS8450 Digital Ultra Speed 1.92 oz
(54.5 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 98 oz-in
(7.1 kg-cm)		 0.10/0.08 sec
@ 60 deg		 Coreless, alloy gears, Dual Ball Bearings (wide spaced)
$159.95/$114.95
 hi performance cars & trucks
DS8550 Digital Ultra Torque Race 2.03 oz
(57.7 g)		 0.73 x 1.52 x 1.32 in
(19 x 39 x 34 mm)		 188 oz-in
(13.6 kg-cm) 6v		 0.15 sec
@ 60 deg 6v		 Coreless, alloy gears, Dual Ball Bearings
$114.95
 tail rotor use
DS9411 Digital High Speed 1.36 oz
(38.6 g)		 0.75 x 1.41 x 1.03 in
(19 x 36 x 26 mm)		 82 oz-in
(5.9 kg-cm)		 0.15 sec
@ 60 deg		 Coreless, Dual Ball Bearings
$99.95