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Servo # Description Weight Dimensions Torque 4.8V / 6.0V   Speed Motor/ Bearings Street Price Notes
  oz-in Volts@
(W x L x H) kg-cm  
321 Micro BB 0.77 oz 0.58 x 1.30 x 1.02 in 29.7 oz-in   0.23 sec 5-Pole Ferrite, Single Ball Bearing Disc.  
(21.9 g) (15 x 33 x 26 mm) (2.1 kg-cm)   @ 60 deg
331 Micro 0.63 oz 0.50 x 1.12 x 1.17 in 42.2 oz-in   0.23 sec 3-Pole Ferrite, No Bearings $27.99  
(17.9 g) (13 x 28 x 30 mm) (3.0 kg-cm)   @ 60 deg
341 Micro 0.63 oz 0.50 x 1.12 x 1.17 in 31.9 oz-in   0.24 sec 5-Pole Ferrite, No Bearings $36.95  
(17.9 g) (13 x 28 x 30 mm) (2.3 kg-cm)   @ 60 deg
351 Micro Metal Geared 0.88 oz 0.50 x 1.12 x 1.17 in 31.9 oz-in   0.24 sec 5-Pole Ferrite, metal gears, No Bearings $64.95  
(25.0 g) (13 x 28 x 30 mm) (2.3 kg-cm)   @ 60 deg
507 Standard 1.47 oz 0.73 x 1.52 x 1.32 in 40.3 oz-in   0.22 sec 3-Pole Ferrite Disc.  
(41.7 g) (19 x 39 x 34 mm) (2.9 kg-cm)   @ 60 deg
513 Standard Retract 1.72 oz 0.73 x 1.52 x 1.32 in 67 oz-in   1.25 sec 5-pole ferrite, Single Ball Bearing $32.95  
(48.8 g) (19 x 39 x 34 mm) (4.8 kg-cm)   @ 60 deg
517 Standard Ball Bearing 1.58 oz 0.73 x 1.52 x 1.32 in 40.3 oz-in   0.25 sec 3-Pole Ferrite Disc.  
(44.9 g) (19 x 39 x 34 mm) (2.9 kg-cm)   @ 60 deg
527 Standard Sport 1.47 oz 0.73 x 1.52 x 1.32 in 40.3 oz-in   0.25 sec 3-pole ferrite, No Bearings $17.95  
(41.7 g) (19 x 39 x 34 mm) (2.9 kg-cm)   @ 60 deg
531 Premium Sport 1.50 oz 0.73 x 1.52 x 1.32 in 51 oz-in   0.21 sec 3-pole ferrite, Single Ball Bearing $39.95  
(42.6 g) (19 x 39 x 34 mm) (3.7 kg-cm)   @ 60 deg
537 Standard Sport BB 1.58 oz 0.73 x 1.52 x 1.32 in 43 oz-in   0.25 sec 3-pole ferrite, Single Ball Bearing $26.95 heli and sport use
(44.9 g) (19 x 39 x 34 mm) (3.1 kg-cm)   @ 60 deg
605 Monster FET 4.75 oz 1.26 x 2.50 x 2.30 in 139.1 oz-in   0.28 sec Cored Motor, Dual Bearings $99.95  
(134.9 g) (32 x 64 x 58 mm) (10.0 kg-cm)   @ 60 deg
615 Ultra Torque Monster FET 5.12 oz 1.26 x 2.50 x 2.30 in 181 oz-in   0.19 sec Coreless, Dual Ball Bearings $99.95  
(145.4 g) (32 x 64 x 58 mm) (13.1 kg-cm)   @ 60 deg
703 Low Profile Retract 1.16 oz 0.88 x 1.73 x 0.93 in 93.2 oz-in   1.36 sec Cored, Dual Ball Bearings, 160 deg $89.95/$62.95  
(32.9 g) (22 x 44 x 24 mm) (6.7 kg-cm)   @ 60 deg
791 Hi-Torque Lo-Profile Retract, Metal 1.6 oz 0.88 x 1.73 x 0.93 in 260 oz-in 4.8 1.55 sec  coreless, Dual Ball Bearings  $59.99 fit for many of Hangar 9's retractable ARFs, like the .60- and 1.50-size Mustangs or the .60-size Corsair. 
(45.26 g) (22 x 44 x 24 mm) (18.73 kg-cm) @ 60 deg
810G  Sport Tail Servo: Heli 1.68 oz .75 x 1.54 x 1.36 in 34 oz-in 4.8 0.10 sec Nylon gears $64.99 heli fliers can get improved tail precision over standard servos at a cost-conscious price
(47.63 g) (19.05 x 39.12 x 34.55 mm) (2.45 kg-cm) @ 60 deg
911 Mid Size Low Profile BB 1.13 oz 0.71 x 1.41 x 1.03 in 43.1 oz-in   0.27 sec 5 pole ferrite, Dual Ball Bearings Disc.  
(32.1 g) (18 x 36 x 26 mm) (3.1 kg-cm)   @ 60 deg
2700G Precision Hi-Speed 2.0 oz 0.73 x 1.29 x 1.52 in 49 oz-in   0.11 sec Raced, Dual Ball Bearing Disc.  
(56.8 g) (19 x 33 x 39 mm) (3.5 kg-cm)   @ 60 deg
2721 Ultra-Torque Alloy 1.84 oz 0.73 x 1.29 x 1.32 in 116 oz-in   0.18 sec Coreless, Dual Ball Bearing $99.99 comparable to 4721 with better gearing
(52.3 g) (19 x 33 x 34 mm) (8.4 kg-cm)   @ 60 deg
3021 Mini 0.84 oz 0.58 x 1.30 x 1.02 in 37.5 oz-in   0.22 sec Coreless, Dual Bearings Disc.  
(24.0 g) (15 x 33 x 26 mm) (2.7 kg-cm)   @ 60 deg
3025 Ultra Speed 0.95 oz 0.58 x 1.30 x 1.02 in 29.2 oz-in   0.15 Coreless, Dual Bearings Disc.  
(27.0 g) (15 x 33 x 26 mm) (2.1 kg-cm)  
3121 Mini High Speed 0.84 oz 0.58 x 1.30 x 1.02 in 46.4 oz-in   0.17 sec Coreless, Dual Ball Bearings $69.99  
(24.0 g) (15 x 33 x 26 mm) (3.3 kg-cm)   @ 60 deg
3321 Wing Ball Bearing Servo 0.95 oz 0.58 x 1.30 x 1.30 in 59.8 oz-in   0.36 sec Coreless, Dual Bearings $74.95 glider wings
(27.0 g) (15 x 33 x 33 mm) (4.3 kg-cm)   @ 60 deg
4000 Super Servo 1.76 oz 0.73 x 1.52 x 1.32 in 73.6 oz-in   0.17 sec Coreless, Dual Bearings Disc.  
(50.0 g) (19 x 39 x 34 mm) (5.3 kg-cm)   @ 60 deg
4131 Ultra Precision 1.50 oz 0.73 x 1.52 x 1.32 in 90.4 oz-in   0.23 sec Coreless, Dual Ball Bearings $79.95  
(42.6 g) (19 x 39 x 34 mm) (6.5 kg-cm)   @ 60 deg
4721 Ultra Torque 1.72 oz 0.73 x 1.52 x 1.32 in 119.6 oz-in   0.22 sec Coreless, Dual Ball Bearings $84.95  
(48.8 g) (19 x 39 x 34 mm) (8.6 kg-cm)   @ 60 deg
4735 Ultra Speed 1.72 oz 0.73 x 1.52 x 1.32 in 90.0 oz-in   0.15 sec Coreless, Dual Ball Bearings $84.95 good for race cars
(48.8 g) (19 x 39 x 34 mm) (6.5 kg-cm)   @ 60 deg
7005 Low Profile High Speed 1.31 oz 0.88 x 1.73 x 0.93 in 62.6 oz-in   0.19 sec Coreless, Dual Ball Bearings $89.95  
(37.2 g) (22 x 44 x 24 mm) (4.5 kg-cm)   @ 60 deg
7100 Low Profile Super 1.31 oz 0.88 x 1.73 x 0.93 in 60.5 oz-in   0.19 sec Coreless, Dual Ball Bearings Disc.  
(37.2 g) (22 x 44 x 24 mm) (4.4 kg-cm)   @ 60 deg
8101 Ultra Precision 1.73 oz 0.73 x 1.52 x 1.32 in 90.4 oz-in   0.23 sec Coreless, Dual Ball Bearings, 160 deg $74.95  
(49.1 g) (19 x 39 x 34 mm) (6.5 kg-cm)   @ 60 deg
8700G High Speed Super S 2.11 oz 0.73 x 1.52 x 1.32 in 49.9 oz-in   0.09 sec Coreless, Dual Ball Bearings (wide spaced) $129.95 PCM only
(59.9 g) (19 x 39 x 34 mm) (3.6 kg-cm)   @ 60 deg
9011 Mid Size 1.31 oz 0.75 x 1.04 x 1.42 in 60.6 oz-in   0.21 sec Coreless, Dual Ball Bearings $62.95  
(37.2 g) (19 x 26 x 36 mm) (4.4 kg-cm)   @ 60 deg
DS168 Digital Thin Wing MG Servo
 0.70 oz 0.34 x 1.33 x 1.18 in 46.9 oz-in   0.14 sec Core, Gears: Brass, Alloy, and Plastic combo $74.99 At just 1/3 of an inch thick, the DS168 packs the superb holding torque, minimal deadband and high resolution of JR digital technology into a package that's ideal for high-performance scale sailplanes and electrics. Its impressive 46.6 oz/in of available torque means it will work as well on flaps as it does on ailerons or elevators.
(9.07 g) (11.43 x 22.1 x 21.59 mm) (1.22 kg-cm)   @ 60 deg
DS285 Digital High Speed micro servo 0.32 oz 0.45 x 0.87 x 0.85 in 16.9 oz-in   0.18 sec 3 pole ferrite, nylon gears, No Bearings $34.99 perfect for micro heli users and precision electric foam airplane pilots.
(9.07 g) (11.43 x 22.1 x 21.59 mm) (1.22 kg-cm)   @ 60 deg
DS368 Digital Servo 0.80 oz 0.50 x 1.12 x 1.17 in 53 oz-in   0.21 sec Cored, metal gears, No Bearings $69.95  
(22.7 g) (13 x 28 x 30 mm) (3.8 kg-cm)   @ 60 deg
DS811 Digital Advanced Sport 1.44 oz 0.75 x 1.49 x 1.52 in 54/66 oz-in   0.18/0.15 sec Cored, plastic gears, Single ball bearing $47.99  
(40.9 g) (19 x 38 x 39 mm) (3.9/4.8 kg-cm)   @ 60 deg
DS821 Digital Sport Hi-Torque 1.5 oz 0.74 x 1.50 x 1.47in 73oz-in   0.19 sec 3 pole ferrite, , composite gears, Single ball bearing $29.99  Standard size-digital servo upgrade for sport pilots
(45.52 g) (19 x 38 x 39 mm) (5.26 kg-cm)   @ 60 deg
DS3301 Digital Wing Servo 1.00 oz 0.58 x 1.30 x 1.30 in 56 oz-in   0.22 sec Coreless, nylon gears, Dual Ball Bearings $89.95  
(28.4 g) (15 x 33 x 33 mm) (4.0 kg-cm) @ 60 deg
DS3400G Digital Hi-Speed Mini Gyro Servo 1.04 oz 0.58 x 1.30 x 1.02 in 51.0oz-in 4.8 / 6.0 0.11 / 0.09 sec BB, nylon gear $74.99

Premium performance servo package for mini electric helis (such as T-Rex). Provides "big helicopter feel" for ultra-precise hovering and locked-in yaw control for enhanced sideways and backwards flight.
(29.48 g) (14.73 x 33.02 x 25.91 mm) (3.7 kg-cm) @ 60 deg
DS3401 Digital Mini     59.72 oz-in 4.8 0.19 sec BB, metal gear box w/ nylon gear $71.44  
    (4.3 kg-cm) @ 60 deg
DS3421 Digital High Speed 1.04 oz 0.58 x 1.30 x 1.02 in 65 oz-in   0.18 sec Coreless, Dual Ball Bearings $84.95 not for gyro usage, use DS9411
(29.5 g) (15 x 33 x 26 mm) (4.7 kg-cm)   @ 60 deg
DS3421SA Digital Mini SA 0.92 oz 0.58 x 1.30 x 1.02 in 65 oz-in   0.18 sec Coreless, Dual Ball Bearings $79.95 A favorite of many jet and precision aerobatic fliers, the DS3421SA offers an impressive 65 oz/in of torque in a very compact, mini-size case. Wherever weight is critical and precision is paramount, this is the servo for the job. Using a hybrid gear train that consists of an aluminum output gear and nylon counter gears, it provides the perfect balance of strength and precise feel. Specified for use in many of his jet aircraft, the DS3421SA's superb holding power and zero deadband have made it a popular choice for many other popular performance aircraft as well
(26.08 g) (15 x 33 x 26 mm) (4.7 kg-cm)   @ 60 deg
DS8231 Digital Ultra Precision 1.76 oz 0.73 x 1.52 x 1.32 in 88 oz-in   0.22 sec Coreless, nylon gears, Dual Ball Bearings $82.99 comparable to JR4131
(50.0 g) (19 x 39 x 34 mm) (6.4 kg-cm)   @ 60 deg
DS8231 Digital Ultra Precision 1.76 oz 0.73 x 1.52 x 1.32 in 88 oz-in   0.22 sec Coreless, nylon gears, Dual Ball Bearings $129.95/$99.95 comparable to JR4131
(50.0 g) (19 x 39 x 34 mm) (6.4 kg-cm)   @ 60 deg
DS8311 High-Torque Digital: Heli 1.87 oz 0.75 x 1.54 x 1.36 in 130 oz-in   .18 sec coreless, dual wide spaced $99.99 An excellent swashplate servo for high-performance CCPM helis
(53.01 g) (19.05 x 39.11 x 34.54 mm) (9.36 kg-cm)   @ 60 deg
DS8317 High-Speed Digital: Heli 2.0 oz 0.75 x 1.54 x 1.36 in 66.6 / 83.8 oz-in 4.8 / 6.0 0.15 / 0.12sec coreless, Metal gears $99.99 high-speed digital servo perfect for use in helicopters!
(56.70 g) (19.05 x 39.11 x 34.54 mm) (4.8 / 6.03 kg-cm) @ 60 deg
DS8401 Digital Ultra High Torque FET     155 oz-in 4.8 0.19 sec   $89.78  
    (11.2 kg-cm) @ 60 deg
DS8411 Digital Servo 2.03 oz 0.73 x 1.54 x 1.32 in 155 oz-in   0.18 sec Coreless, Dual Ball Bearings (wide spaced) $159.95/$114.95  
(57.7 g) (19 x 39 x 34 mm) (11.2 kg-cm)   @ 60 deg
DS8411SA Digital Servo Special Application 2.03 oz  0.75 x 1.54 x 1.36 in 155 oz-in   0.18 sec Coreless, Dual Ball Nylon, wide spaced $99.99 giant scale aerobatic pilots 
(57.7 g) (19.05 x 39.11 x 34.54 mm) (11.2 kg-cm)   @ 60 deg
DS8417 Digital High Speed 2.03 oz 0.73 x 1.52 x 1.32 in xx oz-in   0.10 sec Coreless, alloy gears, Dual Ball Bearings (wide spaced) $159.95/$114.95 tail rotor use
(57.7 g) (19 x 39 x 34 mm) (xx kg-cm)   @ 60 deg
DS8450 Digital Ultra Speed 1.92 oz 0.73 x 1.52 x 1.32 in 98 oz-in   0.10/0.08 sec Coreless, alloy gears, Dual Ball Bearings (wide spaced) Disc. hi performance cars & trucks
(54.5 g) (19 x 39 x 34 mm) (7.1 kg-cm)   @ 60 deg
DS8511 Digital Ultra High Torque FET     208.3 oz-in 4.8 0.19 sec   $103.55  
    (15.0 kg-cm) @ 60 deg
DS8611A Digital Ultra Torque 2.24 oz .82 x 1.5 x 1.56 in 260 / 320 ox-in   0.18 / Alloy w/ metal/nylon B1 gear $114.95  
(63.50 g) (2.08 x 38.1 x 39.62 mm) (18.72 / 23.04 kg-cm)   @ 60 deg
DS8711 Digital Ultra Torque SX 2.36 oz .82 x 1.5 x 1.56 in 347 / 403 ox-in 4.8 6.0 0.15 / 0.19 sec Alloy w/ metal/nylon B1 gear $139.95 The unmatched power of JR’s DS8711 standard-size digital servo is nothing short of astonishing. But the 8711’s story doesn’t end with its awesome power. The 8711 also has all the speed, the holding-power and the zero-deadband precision that have made JR digitals the choice of serious RCers right from the start. Plus it’s also the first JR digital to feature an aluminum heat sink section for optimum reliability. 
(66.90 g) (2.08 x 38.1 x 39.62 mm) (24.99 / 29.02 kg-cm)   @ 60 deg
DS9411 Digital High Speed 1.36 oz 0.75 x 1.41 x 1.03 in 82 oz-in   0.15 sec Coreless, Dual Ball Bearings $94.95  
(38.6 g) (19 x 36 x 26 mm) (5.9 kg-cm)   @ 60 deg
DZ3650 Digital Hi-Speed Mini Race  1.04 oz .58 x 1.30 x 1.02 in 51 oz-in 6.0 0.09 sec Coreless Motor, Metal Gears $74.99 1/12 and 1/10 indoor racing
(29.48 g) (14.73 x 33.02 x 25.91 mm) (3.67 kg-cm) @ 60 deg
DZ9000S Digital Hi-Speed/Torque Surface 2.2 oz 0.83 x 1.59 x 1.50 in 128 oz-in 6.0 0.06 sec Metal gears $114.95  
(62.37 g) (21.01 x 40.39 x 38.1 mm) (9.21 kg-cm) @ 60 deg
DZ9000T Digital Ultra Torque Surface 2.2 oz 0.83x1.59x1.50 in 320 oz-in 6.0 0.15 sec Metal gears $114.95  
(62.37 g) (21.01 x 40.39 x 38.1 mm) (23.04 kg-cm) @ 60 deg
ES539 Standard High Torque     70.82 oz-in 4.8 0.24 sec   $17.10  
    (5.1 kg-cm) @ 60 deg
NES-591 Standard High Torque     70.82 oz-in 4.8 0.24 sec   $17.10  
    (5.1 kg-cm) @ 60 deg
NES-810G Standard High speed     33.33 oz-in 4.8 0.10 sec Metal Gears $53.77 Helico tail
    (2.4 kg-cm) @ 60 deg
NES-8700G Standard Very High speed     48.60 oz-in 4.8 0.09 sec Metal Gears $53.77 Helico tail
    (3.5 kg-cm) @ 60 deg
S241 Sub-Mirco Servo
 0.32 oz 0.45 x 0.87 x 0.85 in 17 oz-in  4.8 0.17 sec 3-pole ferrite $27.95 Micro R/C is growing in a big way. Sub 10-ounce hand-launch gliders, slow flyers, micro electronic indoor airplanes, miniature helicopters--the S241 is the perfect servo for all these applications. It weighs less than a third of an ounce and measures a mere .45" x .85" x .87". Despite its minuscule size and weight, the S241's 17oz. /in. of torque makes it the most powerful servo in the sub-micro category.
( 9.07 g) (11.43 x 22.1 x 21.59 mm) (1.22 kg-cm)  
SR3801 DIGITAL MINI ROBOT
1.1 oz 0.59 x 1.30 x 1.02 in 98.6 oz-in  7.4 0.11 sec 3-pole ferrite $84.95

JR has applied the engineering talent that made them leaders in the RC servo market to a new, emerging field - the programmable robot market.Known for producing extremely powerful, precise and highly reliable products, JR's new robot servos apply leading edge technology to the unique application of robotics.
( 31.18 g) (14.99 x 33.02 x 25.91 mm) (7.1 kg-cm)  
SR8801 Digital Ultra Torque Robot Servo
 2.3 oz 0.83 x 1.59 x 1.41 in 395.8 oz-in    0.14 sec 3-pole ferrite $124.95

JR has applied the engineering talent that made them leaders in the RC servo market to a new, emerging field - the progammable robot market. Known for producing extremely powerful, precise and highly reliable products, JR's new robot servos apply leading edge technology to the unique application of robotics
( 65.20 g) (21.08 x 40.39 x 35.81 mm) (28.44 kg-cm)