Servo Arm Metal Single Side 1.5" JR
$10.99
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Servo Arm Metal Single Side 1.5" JR
$10.99
Anodized Aluminum
Exceptional rigidity and strength
JR Spline Fit
Precision direct spline match
4-40 Threading
Secure heavy duty linkage
In Stock
Precision Control HardwareHeavy duty performance for servos
Upgrade your radio control setup with the MPI 1.5" Single HD 4-40 Aluminum Servo Arm for JR Servos by Maxx Products. Crafted for maximum strength and precision steering or control surface response, this heavy-duty aluminum horn eliminates flexing often found in standard plastic arms. Designed specifically for high-torque JR servos, it ensures crisp control in demanding giant-scale RC airplanes, RC cars, and helicopters.
High Torque Control ArmUncompromising durability for severe loads
When setting up large-scale RC aircraft, gas models, or heavy-duty RC surface vehicles, stock nylon servo arms can flex under heavy load, causing sloppy control or mechanical failure. The MPI 1.5" Single HD 4-40 Aluminum Servo Arm for JR Servos delivers unmatched structural integrity thanks to its CNC-machined, high-grade anodized aluminum construction. Featuring standard 4-40 thread tapping, this single arm offers secure push-rod engagement without slop. Engineered by Maxx Products, it provides dependable mechanical advantage for high-stress applications in giant-scale aerobatic planes, jets, and custom RC projects requiring absolute precision control.
Component SpecificationsHardware specifications and compatibility details
Compatible Servos
Standard JR Servo Splines
Part Type
Servo Arm / Horn Hardware (component)
Arm Length
1.5 Inches
Arm Style
Single Arm Heavy Duty (HD) (gear)
Material
Anodized CNC Machined Aluminum
Thread Size
4-40 Tapped Threads
Manufacturer
Maxx Products / MPI
Hardware HighlightsEngineered features for hobbyists
Heavy-Duty ConstructionMachined anodized aluminum prevents flexing under intense control loads
JR Servo Spline FitPrecision broached spline designed specifically for standard JR servos
Pre-Tapped Linkage HolesPre-threaded for standard 4-40 heavy-duty linkage hardware
1.5-Inch Throw LengthProvides ideal leverage and surface deflection for large-scale setups
Corrosion Resistant FinishAnodized coating protects against oil, wear, and weather
Eliminates Control SlopSolid metal design ensures immediate, accurate control surface transfer
Frequently Asked QuestionsEverything you need to know
Is the MPI 1.5" Single HD 4-40 Aluminum Servo Arm, for JR Servos compatible with Futaba or Hitec servos?
No, this specific MPI servo arm is machined specifically for JR servo output splines. Futaba and Hitec servos use different spline tooth counts and will not fit correctly.
What thread size pushrod hardware does the MPI 1.5" Single HD 4-40 Aluminum Servo Arm, for JR Servos accept?
The holes on this MPI heavy-duty arm are pre-tapped to standard 4-40 thread size, making it ideal for heavy-duty ball links and pushrod setups.
Why should I upgrade to the MPI 1.5" Single HD 4-40 Aluminum Servo Arm, for JR Servos over a standard plastic arm?
Standard plastic arms flex under heavy loads, leading to imprecise control surface movement or stripped splines. This aluminum servo arm eliminates flex, giving you crisp and precise control.