Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z

This is the HS-645MG Metal-Geared, Coreless, Ball Bearing, Hi-Torque Servo from Hitec. This version of the servo has a universal connector which will fit Airtronics, JR, Hitec and Futaba receivers (be careful with the polarity of the connector for Futaba radios).
Specifications:

• Speed:
• 4.8V:0.24 sec/60 deg.
• 6.0V:0.2 sec/60 deg.
• Torque:
• 4.8V:107 oz/in
• 6.0V:133 oz/in
• Length:1.5in (38mm)
• Width:0.79in (20mm)
• Height:1.61in (41mm)
• Weight:1.95oz (55.2g)

Limited Warranty:
Hitec Servo Warranty: Each Hitec servo is backed by a limited two-year warranty from the date of purchase. Hitec RCD USA, INC. shall REPAIR OR REPLACE, at Hitec RCD, INC., defective equipment covered by this warranty, otherwise the purchaser and/or consumer is responsible for any charges for the repair or replacement of the product.

This product was added to our catalog on December 20, 2005

Anonymous Tuesday, Feb 23 2010 (about 15 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z Theres nothing wrong with this servo, or at least nothing wrong with the one i have. it has a VERY slight centering problem, and i cant tell when im driving. it is very quiet too. i like it. 3 customers found this review helpful. Matthew Zorn Friday, Dec 29 2017 (about 7 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z I’ve has these servos for quite a while. This is a high torque servo, and a slower servo as described in the numbers in the specs. So why is there a bunch of complaining with these servos If you don’t understand the numbers in the specs, then get off your ass and call Amain for help!!!!! 3 of 4 customers found this review helpful. Anonymous Thursday, Nov 22 2007 (about 17 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z Excellant value! Torquey and reasonably quick. Cant beat it for the money. 2 customers found this review helpful. Anonymous Wednesday, May 21 2008 (about 17 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z been running these for a few years now and always worked great for me. Reasonable speed wise….yesCyber speed….well no. 1 customer found this review helpful. Scott Krogh Verified Owner Friday, Jan 24 2025 (8 months ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z I bought this servo for my Tamiya Hornet EVO. None of the stock Tamiya servo savers work with this unit. I bought a cheap Futaba unit and that solved my problem. Gage Jex Verified Owner Sunday, Jan 5 2025 (9 months ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z i put this in my tamiya cw01 pajero and it works great, def not a high torque or high speed, but it it good for backyard runners. Coopa Friday, Aug 23 2024 (about a year ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z Works great in my 1/10 scale m chassis budget build! Havent had any problems with it and have used it very frequently. Would recommend Locoboy Verified Owner Friday, May 3 2024 (about a year ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z I used this Hitec HS-645MG in my Tamiya Bull Head. Though the truck is all custom, it still uses the stock style steering system with one servo mounted in the bottom of the aluminum chassis (Sassy Chassis) that steers all four wheels. This servo works great in my truck and it did not break the bank. As far as price versus performance, there is no better deal on today’s R/C market for a steering servo in my opinion. The HS-645MG has been in production for many years now and that is because it just works and it is very affordable. Sure there are better servos that easily out-perform it, but they all cost a lot more. For the price, the HS-645MG cannot be beat in my book. Luis Gonzalez Verified Owner Wednesday, Jul 5 2023 (about 2 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z Best attention to customer, many tks.
Keep up the good work.
Best regards
Luis Adam Clark Friday, Apr 1 2011 (about 14 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z I have this servo in my traxxas sport maxx which i bought a few years ago. i bought it when the traxxas one went bad which wasn’t very long and it has worked great for me. no complaints at all. 1 of 2 customers found this review helpful. SHANE FOOTE Monday, Mar 1 2010 (about 15 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z Decent Servo for the money. Hitec has great customer support. 1 of 2 customers found this review helpful. Anonymous Wednesday, Jan 21 2009 (about 16 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z One word….JUNK!!!!!!!!! Really slow and fails quick. Used one has a backup servo for T/B and wasnt even worth the time . If you want a cheap good trq. servo go with a JR 650m great servo and its only 50.00 1 of 3 customers found this review helpful. Adam Fisher Verified Owner Monday, May 9 2016 (about 9 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z Bought this servo for an Engineering project and while it works well at 5v, it kept glitching and failing to go to the correct positions at 6v. Would not recommend considering i could not get the maximum torque out of it due to voltage issues. 0 of 2 customers found this review helpful. Anonymous Sunday, Feb 28 2010 (about 15 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z mine broke the same day on my buggy, no good, trash!!!!!!!!! 0 of 2 customers found this review helpful. Peter Burke Tuesday, Feb 17 2009 (about 16 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z One word describes this servo, JUNK. Its slow its unreliable and just junk through and through. I bought one of these when i was in a bind and could not get my hands on a futaba, Never again would i buy one. Get the Futaba s3305, so much faster, 100% reliable, and the usual futaba quailty. I had one of each in a car and the futaba leaves it standing, this testing is of course in the real worls and not whats on the box, although they say they have the same speed at 6 volts the futaba is atleast twice as fast. 0 of 2 customers found this review helpful. Anonymous Sunday, Nov 25 2007 (about 17 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z Michael, how can you say its even reasonably quick. Mine is really slow. 0 of 2 customers found this review helpful. kenneth jeffries Saturday, Oct 31 2009 (about 15 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z not a good servo for 1/8 buggy to slow i even try more powerful reveier batteries and it was still to slow,the centering is terrible this only seems to happen with the cheaper hitecs for some reason , one good thing is the torque is pretty good 0 of 3 customers found this review helpful. Anonymous Sunday, Jul 13 2008 (about 17 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z THIS IS BOLLOCKS I IS TELLIN YA :p…nah had one on my throttle/brake…KAPOOF…only one heat, total crap. My EPA was set an it still went. DONT GO THERE, spend the extra and get an ACE 1313. 0 of 3 customers found this review helpful. Ryan Knaub Tuesday, Jan 22 2019 (about 6 years ago) Hitec HS-645MG High Torque Metal Gear Servo S/JR/Z Tried to buy this at my local store and they had it priced at $65, when I showed them the $29 from the website they said “we sell it for this price” I.e. $65. Needless to say I’ll take my business to an online retailer, for that price I could get a good servo, not this wimpy one which was gonna be a throw-away in a week anyway. 0 of 4 customers found this review helpful. View all reviews