Futaba S-U400 Standard Digital Servo PWM/S.Bus2 7.9kg/0.13s 4.8V - 8.4V (Bulk 10 pcs)

The Futaba S-U400 Standard Digital Servo is an S.Bus2-capable aeroplane servo that also supports conventional PWM control. Supplied here as a bulk 10-piece pack (part number FUT05102679-3-B), it’s a practical choice for fleet builds, clubs and multi-model setups where consistent, reliable response is essential. The S-U400 combines plastic gearing with a 6 mm/25T output spline and a 3-pole cored motor in a compact standard-size case.

Performance is strong for its class: at 7.4 V the S-U400 delivers 7.9 kgf·cm of torque with a 0.13 sec/60° transit time; at 6.6 V it provides 7.1 kgf·cm and 0.14 sec/60°. Each servo measures approximately 40 × 20 × 38.1 mm and weighs around 39 g, making it straightforward to integrate into common installations.

Key Features

• Standard digital servo with PWM and S.Bus2 capability
• Torque: 7.1 kgf·cm (6.6 V) / 7.9 kgf·cm (7.4 V)
• Speed: 0.14 sec/60° (6.6 V) / 0.13 sec/60° (7.4 V)
• Dimensions: 40.0 × 20.0 × 38.1 mm
• Weight: 39 g
• Plastic gearing with 6 mm/25T spline
• 3-pole cored motor
• Colour: Black; Material: Plastic
• Age recommendation: 14+

Technical Details

• Torque (oz/in): 98.6 (6.6 V) / 109.7 (7.4 V)
• Size: 40.3 × 20.0 × 38.1 mm
• Weight: 39.12 g (1.38 oz)
• Shipping weight (package): 0.52 kg (1.15 lb)
• Servo size class: Standard

Designed as an aeroplane servo with an accessory pack, the Futaba S-U400 provides dependable control and smooth, precise movement across typical RC aircraft applications.