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Aug 26, 2008, 03:46 PM
Custom CNC machining
jrubenis's Avatar
Discussion

Hitec HS-65MG screw size?


Does anyone know what size and pitch screws are used to hold the servo horns on are? I think its m2.5 but not 100 on the pitch. Seems to be finer than a standard m2.5?
Thanks
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Aug 26, 2008, 05:36 PM
Registered User

Hitec & Futaba Servo Horn Screw Sizes


Quote:
Originally Posted by jrubenis
Does anyone know what size and pitch screws are used to hold the servo horns on are?
I think its m2.5 but not 100 on the pitch. Seems to be finer than a standard m2.5? Thanks
HS-65HB-MG = 2.3 x 5 mm Phillip-head screws.
-------------------------------------------

Hitec Servo Horn Screw Types & Sizes:

. Hitec Screw Set for Metal Geared Servos #55802 "Metal servo Screw Set (5 x short, 5 x long)".
Standard Machined Servo Screws 2.6mm x 6 mm & 8 mm Phillip-head (JIS) screws x 5 fit HS-225MG, HS-525MG, HS-625MG, HS-645MG, HS-705MG, HS-925MG, HS-945MG, HS-5245MG, HS5625MG, HS-5645MG, HS-5745MG, HS-5925MG, HS-5945MG, HS-5955TG, HS-5995TG, HS-5996TG, HS-5997TG, HS-5998TG, HS-7955TG.
Small machined screws, 2.3 x 5 mm Phillip-head (JIS) screws x 5, fit the HS-65MG, HS-81MG, HS-85MG, HS-125MG.
NB: Never use red loctite, in need if star washer is lost, Liquid Thread Lock used sparingly and ensure none remains in contact with plastic parts.
JIS - Japanese Industrial Standard

Hitec Screw Set for Resin Geared Servos #55801

Includes Five Tapped 2.6 x 8mm for standard servos & Five Tapped 2.2 x 5mm for small servo.

Karbonite HS-755HB, 635HB, 485HB 2.6 x 10 mm
HS-325HB 2.6 x 8 mm
HS-65HB, 56HB, A5076HB 2.3 x 8 mm

HS-35/45/50/55/5055MG Hitec Servo Horn Set #55708 includes the smaller 1.7 x 3.0 mm horn screw

30Jul10 - Hitec list new items, screw lengths yet to be verified:
#56412 Metal/Titanium Gear Horn Screw Set (Machined 2.3 / 2.6mm) - For Tamiya servo saver
#56413 Nylon/Karbonite Gear Horn Screw Set (Tapped 2.3 / 2.6mm) - For Tamiya servo saver

10 December 2012
Hitec 8*** series servo have 25T spline and 3mm horn screw.

Hitec Servo Nomenclature & Ball Bearing Sizes extract:
Hitec RC Ball Bearing Sizes and part numbers for all Hitec servo as at 12Nov12
Micro Servo Ball Bearings:
. 7mm OD x 4mm ID x 2.0mm width = MR74 (e.g. HS-45HB = MR74)
. 8mm OD x 5mm ID x 2.5mm width = MR85 (e.g. HS-56 & HS-65 = MR85)
Universal Servo Ball Bearing = #58471
. 10mm OD x 6mm ID x 2.5mm Width = MR106 (e.g. HS-5245MG = MR106)
Big Ball Bearing = #58473
. 14mm OD x 8mm ID x 3.5mm Width = MR14 (for HS-805BB & HS-815BB)
================================================== ====



. Servo - Horn Arm Spline Count and Inter Brand Compatibility


Futaba Servo Horn Screw Types & Sizes:

. Futaba Micro Mini Servo - Nylon Output Shaft = Small Tapped Screws
Diameter: 1.80mm (0.07") Length: 4.20 mm (0.16")

. Futaba S33 and S133 Servos - Nylon Output Shaft = Tapped Screws
Diameter: 2.60mm (0.10") Length: 5mm (0.19")

. Futaba Small MG Horn Screws - Small Machined Screws.
Diameter: 2.00mm (0.08") Length: 4.4 (0.16") Washer Diameter: 4.4mm (0.17")

. Futaba Servo Horn Screws - Nylon Output Shaft = Standard Tapped Screws:
Diameter: 2.60mm (0.10") Length: 8mm (0.31")
S28 S128 S136 S9001
S29 S129 S138 S9102
S30 S130 S148 S9202
S31 S130G S3001 S9301
S32 S131 S3003 S9304
S34G S132 S5101 S9403
S35 S134G S9601
S48 S135

. Futaba Servo Horn Screw - Metal Output Shaft = Standard Machined Screws.
Diameter: 2.60mm (0.10") Length: 5mm (0.19")
S3002 S9203 S9302
S3102 S9204 S9303
S3302 S9205 S9402
S3801 S9206 S9404 S9405

. Futaba Horn Screw - Nylon Output Shaft = Standard Tapped Screws
Diameter: 2.60.10mm (0.10") Length: 10.00mm (0.39")
S9401 S9102 S134 S136G
S9403 S9202 S9301 S3104 S9201

. Futaba Servo Horn Screw - S125 Sail Servo = Standard Machined Screw.
Diameter: 2.00mm (0.08") Length: 6.00 mm (0.23")

. Futaba Servo S3150 Horn Screw
Diameter: 3.00mm (0.12") Length: 6.00 mm (0.23")

. Futaba Servo S9150 Horn Screw - Standard Machined Screw.
Diameter: 2.80mm (0.11") Length: 8.00 mm (0.31")

. Futaba Servo Horn Screw Standard Machined Screw for S9152, 9155 & S9550
Diameter: 3.00mm (0.12") Length: 8mm (0.31")

Alan Tong
Alan's Hobby, Model & RC FAQ Web Links
Last edited by A.T.; Jan 01, 2013 at 05:10 AM. Reason: update an url
Aug 26, 2008, 07:20 PM
Oxford Panic
AndyOne's Avatar
I seem to remember that Hitec used BA sizes on their early servos. I was surprised to discover this because BA (British Association) is relatively old fashioned screw type and has been since the 1970s.

Andy.
Aug 27, 2008, 05:05 AM
supreme being of leisure
ZAGNUT's Avatar
Quote:
Originally Posted by AndyOne
I seem to remember that Hitec used BA sizes on their early servos. I was surprised to discover this because BA (British Association) is relatively old fashioned screw type and has been since the 1970s.

Andy.
true but because there are still huge stocks of these types of fasteners people will still use them if they can get them for cheap

and kinda related: a while ago a friend came to me moaning that the new allen head screws he used on the head of his '42 BSA keep coming loose no matter what he does...



dave


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