Does the pulse width need to vary beyond the range produced by a typical hobby receiver to get the full 270 degree rotation?

Yes,you're right! Generally speaking, the output pulse width of the remote control is in the range of 1000-2000,so the displayed angle is 135 degrees;To get the full 270 degrees rotation, the output pulse width should be 500-2500. :)

Will this servo fit a traxxas rustler?

Yes,this rc servo can fit traxxas rustler

What are the motor arm dimensions? What size are the holes in the arm? Are they clearance holes or threaded? Where are the wires located on the back?

Thanks for your question.Servo Arm is 25Tooth,they are threaded.More info please contact with seller.

my esc has output voltage of 12v can work with 12v?

It's not ok cause the voltage is too high

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20KG RC Digital Servo High Torque Full Metal Gear Waterproof,Control Angle 270°

20KG RC Digital Servo High Torque Full Metal Gear Waterproof,Control Angle 270°

Product ID: 53439705

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💧Waterproof sealed design

🔄270° control angle

⚙️21.5 kg/cm torque max

Description

⚙️ Elevate your robotics game with torque and precision that won’t quit!

LIGHTWEIGHT COMPACT - At just 60g and 40x20x40.5mm, it fits seamlessly into any high-performance project.
PRECISION ENGINEERING - Advanced linearity with CNC aluminum shell and metal gears ensures ultra-smooth, low-noise operation.
UNMATCHED TORQUE POWER - Delivers a commanding 21.5 kg/cm stall torque for heavy-duty robotic precision.
ALL WEATHER RELIABILITY - Waterproof rubber seals and anodized gears keep your servo performing rain or shine.
DYNAMIC ROTATION CONTROL - 270° rotation range with 360° free spin when powered off—perfect for complex robotic joints.

The DS3218MG is a high-torque, waterproof digital servo featuring full metal gears and a CNC aluminum shell. It offers up to 21.5 kg/cm stall torque at 6.8V, a 270° control angle, and advanced precision potentiometers for smooth, low-noise operation. Compact and lightweight, it’s engineered for demanding robotics, mechanical arms, and remote control applications, making it the go-to choice for professionals and enthusiasts aiming to build next-level automated systems.

Specifications

Product Dimensions	4 x 4.05 x 2 cm; 59 g
Manufacturer recommended age	36 months - 20 years
Item model number	DS3218
Educational Objective(s)	Learn about robotics and programming
Language:	English
Number of Game Players	1
Number of pieces	1
Assembly Required	No
Batteries Required?	No
Batteries included?	No
tech_spec_battery_description_toys	Alkaline or rechargeable batteries
Material Type(s)	Copper & Aluminum
Remote Control Included?	No
Radio Control Number of Bands	1
Colour	Red
ASIN	B076CNKQX4

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