U13F Aluminum Servo Arm for RC Crawlers | 20T Spline, 1/18 & 1/14

Upgrade Your RC Crawler's Steering with the U13F Aluminum Servo Arm

Take your remote control crawler to the next level with the U13F Aluminum Servo Arm. Built from high-quality metal alloy, this precision-engineered servo arm delivers the strength, durability, and adjustability that serious RC enthusiasts demand. Whether you're replacing a worn-out part or upgrading your rig's steering performance, this 20-tooth spline servo arm is an ideal fit for 1/18 and 1/14 scale RC car models.

Made in Mainland China.

Key Features

• High-Strength Alloy Construction: Crafted from durable metal alloy for excellent rigidity and long-lasting performance under demanding RC crawling conditions.
• 20-Tooth Standard Spline: Compatible with a wide range of servo motors using the common 20T spline interface — a reliable, industry-standard fit.
• Adjustable Swing Arm Length: Flexible length adjustment allows you to fine-tune your steering geometry to match different setups and terrains.
• Easy Installation & Removal: Designed for quick, tool-friendly installation and removal — perfect for on-the-go maintenance or field repairs.
• Improved Steering Effort: Replace a broken or stock plastic arm to noticeably increase steering response and precision control.
• Suitable for 1/18 & 1/14 Scale Models: Designed to fit popular RC crawler and car model scales.
• 3 Color Options: Available in three finish options to match your build's style.

Specifications

• Material: Metal Alloy
• Size: Approx. 3.5 × 2.2 cm / 1.38 × 0.87 inch
• Spline: 20T (20-Tooth) Standard
• Compatible Scale: 1/18 and 1/14 RC Car Models
• Colors Available: 3 Options
• Quantity: 1 Set
• Batteries Required: No

Package Includes

• 1 × U13F Steering Servo Arm Set

Notes

• Please allow 1–2 cm variance due to manual measurement.
• Colors may vary slightly due to monitor display differences.

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For more information on hobby safety and responsible RC vehicle use, visit the U.S. Consumer Product Safety Commission (CPSC) for guidelines on toy and hobby product safety.

Learn more: Radio-controlled car

Frequently Asked Questions

Q: What RC crawler scales is the U13F aluminum servo arm compatible with?

A: The U13F servo arm is designed for 1/18 and 1/14 scale remote control car and crawler models that use a standard 20-tooth (20T) spline servo output shaft.

Q: What is the advantage of using an aluminum alloy servo arm over a stock plastic one?

A: Metal alloy servo arms are significantly stronger and more rigid than plastic alternatives. They resist bending and snapping under high steering loads, improving overall precision and responsiveness — especially during rock crawling or aggressive off-road driving.

Q: Is the swing arm length adjustable?

A: Yes! The U13F features an adjustable swing arm design, allowing you to modify the effective arm length to fine-tune steering throw and geometry according to your specific RC model's requirements.

Q: How difficult is it to install the U13F servo arm?

A: Installation is straightforward and beginner-friendly. The arm simply mounts onto the servo's 20T spline shaft and can be secured with the included hardware. It can be removed just as easily for maintenance or swapping setups.