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HomeAircraftHelicopterMain Discussion › Servo horn screw torque value
03-22-2018 06:45 AM  3 months agoPost 1
wakebum187

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west linn, Oregon

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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  3 months agoPost 2
eeeeky

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Roosevelt UT USA

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Snug with loctite???

Lets Fly!

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03-22-2018 01:04 PM  3 months agoPost 3
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  3 months agoPost 4
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  3 months agoPost 5
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  3 months agoPost 6
Heli_Splatter

rrElite Veteran

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  3 months agoPost 7
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  3 months agoPost 8
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  3 months agoPost 9
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  3 months agoPost 10
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  3 months agoPost 11
grimthenoble

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Ketchikan, Alaska

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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  3 months agoPost 12
ICUR1-2

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Ottawa, Ontario

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Snug Em up and do a proper preflight before using

spending time, paying attention

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03-22-2018 06:01 PM  3 months agoPost 13
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  3 months agoPost 14
A&J

rrApprentice

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  3 months agoPost 15
oldfart

rrProfessor

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  3 months agoPost 16
cudaboy_71

rrElite Veteran

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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