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Servos and servo horns are some of the most frustrating items to buy, because most manufacturers and retailers don't share the information needed to confirm whether it will fit your application.
We're here to make it easy.
The stock servo:
It depends on the specific platform, but they're all the same overall size and use a 23 tooth spline made to fit a 6 mm horn.
EMB Series -> Batan D115F
BHC Series -> Batan D132F
LC12B1 -> Batan D115F
With a 39 x 7.5 mm mounting hole pattern, they're an unusual footprint not used by any other servo manufacturer, limiting drop-in upgrades.
The typical OEM upgrade:
The Batan D135F metal gear servo is a direct replacement on the EMB/BHC series and LC12B1, and is a definite durability improvement over the the plastic geared D115F (and an equivalent replacement for the D132F).
However, it's still nowhere near as fast or strong as the more common micro servos on the market.
The Better Solution: Micro Servos
The minis go micro!
Ditch the OEM mounts and open up high speed, high torque options beyond the OEM mounting pattern.
Micro servos have been extensively developed and used across the RC world, and typically use the below mounting patterns:
- 7 mm x 28 mm 4-hole
- 28 mm or 28.8 mm 2-hole
- slotted 2-screw design
To increase your options, we developed mount sets that allow for the use of any common micro servo (including our Titan T2807, which has a unique iridescent coating, hardened steel gears, and shock-resistant resin coated key electronics).
Or, there is a mini option...
Although we have made micro servo mounts, horns, and a servo to support these platforms, we must also mention that we've learned there is a mini servo from KST of near identical dimensions to the factory Batan servos.
We're not here to just push the products we've invested research, time, and money into, we're here to spread knowledge.
The KST CM633 is a high torque, high speed option that includes a plastic servo horn and screws which allow you to connect the stock M2 linkage to it.
Below, we continue our micro servo adventure.
Mounts
EMB Series / LC12B1 Micro Servo Mounts
These mounts are a direct fit on the EMB series and LC12B1, and use the original M2.6 screws for mounting to the chassis, and mounting your chosen micro servo to the mounts.
Precision CNC machined from high-strength 7075-T6 aluminum and anodized in a dark gray finish.
The outer holes are sized for a 28 x 7 mm mounting pattern, and the center holes are spaced at 28.8 mm, as that is the dimension we've found for 2-hole micro servos that do not have a slotted center (such as the Savox SV1232MG).
BHC Series Micro Servo Mounts
The BHC-1 and BHC-1ST require the servo to be elevated and tilted ever so slightly for clearance and proper servo horn positioning. These mounts are otherwise identical to the above EMB mounts when it comes to servo fitment.
Servo Mounting Holes
Since the LC Racing platforms use oddball M2.6 screws for mounting, and most micro servos are expecting M2.5 screws to pass through them, drilling out the mounting holes is a common requirement.
This is why the NSDRC RS100 (with 28 mm hole spacing) can be installed using our micro servo mounts, which have 28.8 mm center-to-center hole spacing.
The Titan T2807 comes pre-sized for LC Racing M2.6 screws and does not require drilling before installation. 👍
Servos
| Brand | Model | Mount | Hole Pattern | Spline | Tested by Scale Speed | |
|---|---|---|---|---|---|---|
| Size and Tooth Count | Internal Thread | |||||
| AGFRC | A20CLS | SCSP14207 or SCSP14210 |
4-hole / Slotted | 5 mm 25T | M2.5 | No |
| AGFRC | A20BHM | SCSP14207 or SCSP14210 |
4-hole / Slotted | 5 mm 25T | M2.5 | Yes |
| Batan | D135F | OEM | 4-hole | 6 mm 23T | M3 | Yes |
| EcoPower | WP173 | SCSP14207 or SCSP14210 |
4-hole / Slotted | 5 mm 25T | M2.3 | No |
| KST | CM633 | OEM | 4-hole | 6 mm 25T | M3 | No |
| NSDRC | RS100 | SCSP14207 or SCSP14210 |
2-hole | 5 mm 25T | M2 | Yes |
| Reefs | 179 | SCSP14207 or SCSP14210 |
4-hole / Slotted | 5 mm 25T | M2.5 | Yes |
| Savox | SV1232MG | SCSP14207 or SCSP14210 |
2-hole | 5 mm 21T | M2 | No |
| Scale Speed | Titan T2807 | SCSP14207 or SCSP14210 |
4-hole / Slotted | 5 mm 25T | M2.5 | Yes |
Servo Horns
Some manufacturers do not have a model number, and some do not share key information.
The missing information is shown as an "X" placeholder. We included these horns because we believe they may have the specifications needed, but we have not yet confirmed it.
| Brand | Model | Spline | Steering Linkage Hole(s) | Compatible Servo | Compatible Vehicle | |
|---|---|---|---|---|---|---|
| Position(s) (mm) | Thread | |||||
| MOFO RC | X | 5 mm 25T | 10, 13 | M2 | Micro | BHC, EMB, LC12B1 |
| Scale Speed | SCSP00202 | 5 mm 25T | 10, 13 | M2 | Micro | BHC, EMB, LC12B1 |
| Scale Speed | SCSP00201 | 5 mm 25T | 12 | M2 | Micro | EMB, LC12B1 |
| RampCrab | X | 5 mm 21T | X | X | Micro | N/A |
| Reefs | 131 | 5 mm 25T | X, X, 13 | M2 | Micro | N/A |
| LC Racing | L6238 | 6 mm 23T | 12 | M2 | OEM Batan | EMB, LC12B1 |
| LC Racing | L5051 | 6 mm 23T | 13 | M2 | OEM Batan | BHC |
BHC Series Notes
The BHC series requires a very specific length and shape horn, which is why some horns are compatible with one platform, while others can fit both, or all three.
What We Recommend
Micro Servo Mounts
Servo Horn
Servo
-
Titan Brushless Micro Servo T2807
Fast, high torque, and durable. We're partial to ours, and believe it to be the best all-around servo, but the Reefs 179 and NSDRC RS100 are also solid options.
Let us know if we missed anything, or you have experience with a servo/horn that wasn't mentioned!
