Servo selection: torque, speed, gears and voltage
How to select servos for trainers, sport aircraft, large models, cars and boats without under-sizing a control surface.
Servo arms SH-21M - Set
Prices are intentionally not displayed on the site.
Contact RC-MODEL for current availability, technical fit, compatible accessories and a formal quote.
Servo arms SH-21M - Set
Servo arms SH-21M - Set is a professional Servo Spareparts item from SieBra GmbH & Co. KG, prepared for the RC-MODEL catalog with customer-facing information, official product imagery, structured specifications and no storefront supplier pricing.
Recommended use
This product is relevant for RC builders and pilots looking for servo spareparts, replacement parts, upgrades or setup components. Use it when planning a new model build, maintaining an existing aircraft, boat or radio system, or comparing compatible electronic and power-system parts.
What to check before ordering
Confirm the physical dimensions, weight, voltage, current rating, connector style, shaft size, cell count, propeller range and installation space against your model. RC-MODEL can help verify compatibility when you provide the model name and part number.
Key details
- Material: High-quality plastic
- Number of output cogs: 25 Compatible servo arms from Ditex Savöx Hitec and Futaba
- Outer diameter output (mm): 5,9
- bore (mm): 1,5 - 1,6
- Thick of the arm (mm): 2,10
- Total height (mm): 6,2
- Quad arm mm: 16,5
- Six arm mm: 13,5
- Manufacturer: SieBra GmbH & Co. KG
- Product Type: Servo Spareparts
- SKU: 80101021
- EAN: 4250320222903
- MPN: 4710006990538
Servo arms SH-21M - Set - fits for Savox Standart Size Servo arms SH-21M - Set - fits for Savox Standart Size
Reference SKU/model: 4710006990538. Mention this reference when contacting RC-MODEL for availability or fitment support.
Relevant RC Academy guides
Learn before you buy
These guides explain the setup, safety checks and accessory choices that usually matter for this product type.
Which servo fits each RC aircraft type?
A buying table for matching servo size, torque, speed, gear type and voltage to trainers, gliders, 3D aircraft, EDF jets and Giant Scale models.
How to install servos and linkages correctly
Mechanical setup guide for servo arms, linkage angles, throw, control horns, neutral position and radio setup after geometry is correct.
How to set Dual Rates and Expo on an RC transmitter
Make an aircraft calmer for beginners by setting low rates, high rates and expo without hiding mechanical setup problems.
How to set failsafe correctly on an RC aircraft
Failsafe setup for electric and fuel aircraft: throttle behavior, receiver signal loss, switch positions and safe verification before flight.
| Technical Specifications | |
| Manufacturer | SieBra GmbH & Co. KG |
| Product Type | Servo Spareparts |
| SKU | 80101021 |
| EAN | 4250320222903 |
| Availability | In stock |
| MPN | 4710006990538 |
| Number of output cogs | 25 Compatible servo arms from Ditex Savöx Hitec and Futaba |
| Material | High-quality plastic |
| Outer diameter output (mm) | 5,9 |
| bore (mm) | 1,5 - 1,6 |
| Thick of the arm (mm) | 2,10 |
| Total height (mm) | 6,2 |
| Quad arm mm | 16,5 |
| Six arm mm | 13,5 |
Tags: SieBra GmbH & Co. KG, Servo arms SH-21M - Set, Servos, Savöx Servos, Servo Spareparts