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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Servo horn screw torque value
03-22-2018 06:45 AM  17 months ago
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wakebum187

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west linn, Oregon

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Servo horn screw torque value
Does anyone know the actual manufacturer torque spec for a full size servo horn screw?
YS Engines
KDE Direct
Tammie's Hobbies
westsideheli.com
�I said no offense�
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03-22-2018 07:30 AM  17 months ago
eeeeky

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Vernal UT USA

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Snug with loctite???Lets Fly!
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03-22-2018 01:04 PM  17 months ago
ssmith512

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Indianapolis, IN USA

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Which manufacturer?Steve
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03-22-2018 01:54 PM  17 months ago
wjvail

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Meridian, Mississippi

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wakebum187...
Does anyone know the actual manufacturer torque spec for a full size servo horn screw?
What eeeky said. Pretty tight - with loctite.

I don't think they spec one. Beyond what might be considered a typical torque specifications for an M3 screw, I've never seen a servo manufacturer give a value.

https://www.holo-krome.com/uploads/...uedatachart.pdf
"Well, nothing bad can happen now."
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03-22-2018 01:59 PM  17 months ago
Pistol Pete

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Seffner, FL

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Finger tight + internal tooth lock washer + loctite 222
and "forget about it!"
~~Enjoying the hobby one flight at a time~~
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03-22-2018 03:23 PM  17 months ago
Heli_Splatter

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USA

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Even if you knew a value, how are you going to measure it? If spline is metal - blue lock tite and snug. Plastic - snug.
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03-22-2018 03:49 PM  17 months ago
Richardmid1

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Leeds, England

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What an odd question.60% of the time, it works every time!
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03-22-2018 03:50 PM  17 months ago
wjvail

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Meridian, Mississippi

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Heli_Splatter...
Even if you knew a value, how are you going to measure it?
I use my torque wrench.

The torque specification for a typical M3 screw varies depending on where you look. Screw material and screw head play a factor; however, typically, it would be around 2.5 N*m (22 in*lb), and even though I have the ability with measure that specification, I'm sticking with "pretty tight" and Loctite.

At this point I will begin the hijacking.... I use Loctite 290 on all my hobby sized screws.

"Well, nothing bad can happen now."
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03-22-2018 04:00 PM  17 months ago
Heli_Splatter

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USA

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Well of course, I just knew someone had the ability to measure it when I told them to go screw themselves. Don't take that personally.
I think that many people over tighten these small fastners. Using the loc-tite and snug has never failed me. I can even get it apart without damaging everything. Maintenance is just as important as the build.
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03-22-2018 04:10 PM  17 months ago
ssmith512

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Indianapolis, IN USA

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Please note that a "standard" torque value is impossible to provide in this type of application. Some servo horns fit a little tighter and some fit a little looser. The varying friction between the servo arm and the servo shaft will SIGNIFICANTLY effect the torque value required to fully seat the servo horn onto the servo shaft.Steve
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03-22-2018 04:47 PM  17 months ago
grimthenoble

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Viroqua, WI

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Torque it enough so it doesn't fall off.Never go Full Retard!
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03-22-2018 04:48 PM  17 months ago
ICUR1-2

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Ottawa, Ontario

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Snug Em up and do a proper preflight before usingspending time, paying attention
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03-22-2018 06:01 PM  17 months ago
gmcullan

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Southbridge, MA

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I've never had a servo arm depart from the servo output shaft. I have had servo arms break in flight pre-crash.Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450
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03-22-2018 06:21 PM  17 months ago
A&J

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Hudson FL 34667

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I can't resist after ..
After spending two days on a
6.0 L Ford... I got to add to this as well
tighten it to it squeaks and give it a quarter of a turn

Nothing is more critical than a diesel
Good common sense tighten it with some Loctite
Lets do the time warp againnn !
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03-22-2018 08:26 PM  17 months ago
oldfart

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Vancouver, Canada

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Just caution here. Locktite is fine for use on metal gear servos into the METAL spline. DO NOT USE locktite when securing servo horns/wheels onto plastic or nylon gear servos. This will cause the spline to become brittle and split over time and your servo wheel will come off!Phil
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03-22-2018 10:23 PM  17 months ago
cudaboy_71

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sacramento, ca, u.s.

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^yes. superglue is "plastic loctite"

I use that on self-tappers in to plastic --not all of them, just the ones that might be prone to wiggle loose.

Can't say I've ever used it on a servo horn. Need to get in to those too often.
if it ain't broke, break it.
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