The Hitec D840WP is a heavy-duty, waterproof, high-voltage digital servo designed for large-scale RC applications that demand serious torque and reliability. Built with a robust steel-gear drivetrain, dual ball bearings, and a wide-voltage 32-bit control system, this servo delivers outstanding performance for 1/5-scale vehicles, large trucks, crawlers, boats, and giant-scale aircraft. Its fully waterproof construction makes it perfect for harsh outdoor conditions and off-road use.

This servo combines brute strength with smooth precision, offering high-response performance and full programmability for advanced users. If you need a servo that won’t fade under load, the D840WP is a top-tier choice.

Specifications

Operating Voltage:
• 4.8V – 7.4V (standard and high-voltage compatible)

Torque:
• 19.0 kg/cm @ 4.8V
• 24.0 kg/cm @ 6.0V
• 30.0 kg/cm @ 7.4V

Speed (per 60°):
• 0.17 sec @ 4.8V
• 0.14 sec @ 6.0V
• 0.11 sec @ 7.4V

Gear Material:
• Heavy-duty steel gear train

Bearings:
• Dual ball bearings for smooth, consistent output

Motor Type:
• High-response digital motor with 32-bit MCU and 12-bit ADC

Waterproof Rating:
• Fully waterproof housing, suitable for wet conditions

Dimensions:
• 66 × 32 × 62 mm

Weight:
• 227 g

Output Spline:
• 15-tooth HD spline (large-scale compatible)

Case Material:
• Reinforced plastic with aluminium top section

Programmable:
• Yes — full adjustability for speed, endpoints, deadband, failsafe and more