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

20kg Digital Servo High Torque Full Metal Gear Waterproof Rc

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Description

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

LIGHTWEIGHT YET RUGGED - Compact 60g full-metal build balances strength with agility for seamless integration.
UNMATCHED TORQUE POWER - Delivers a commanding 21.5 kg/cm torque for heavy-duty RC and robotic precision.
PLUG PLAY VERSATILITY - Compatible with a wide voltage range (4.8-6.8V) and comes with adjustable metal servo arm for instant customization.
BUILT TO BRAVE THE ELEMENTS - Waterproof seals and metal gears ensure durability in any environment, rain or shine.
PRECISION CONTROL AT YOUR FINGERTIPS - Advanced potentiometers provide ultra-smooth, 270° rotation for flawless robotic articulation.

The DS3218MG is a high-performance 20KG digital servo featuring full metal gears, waterproof construction, and a 270° control angle. Designed for RC models, robotics, and mechanical arms, it offers up to 21.5 kg/cm torque at 6.8V, fast response times, and durable CNC aluminum housing. Ideal for professionals and enthusiasts seeking reliable, precise motion control in demanding applications.

Specifications

ASIN	B076CNKQX4
Age Range Description	Kid
Best Sellers Rank	#92,765 in Toys ( See Top 100 in Toys ) #73 in RC Vehicle Servos
Brand Name	ANNIMOS
Color	red
Customer Reviews	4.5 4.5 out of 5 stars (5,049)
Educational Objective	Learn about robotics and programming
Global Trade Identification Number	00601263451471
Indoor Outdoor Usage	Outdoor
Is Assembly Required	No
Item Dimensions	40 x 40 x 20 millimeters
Item Weight	59 Grams
Manufacturer	ANNIMOS
Manufacturer Maximum Age (MONTHS)	240
Manufacturer Part Number	DS3218
Material Type	Metal
Model Number	DS3218
Number of Players	1
Operation Mode	Manual
Power Source	Battery
Size	L
Supported Battery Types	rechargeable NiMH or LiPo batteries
Theme	Robot
UPC	601263451471

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20KG Digital Servo High Torque Full Metal Gear Waterproof for RC Model DIY, DS3218MG,Control Angle 270°

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