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Two silver metal universal joints, 360 degree rotatable, 4mm by 3mm

Unique-Bargains

Unique-Bargains RC Model Motor 360 Degree Rotatable Universal Joint Connector 4mm x 3mm 2PCS

SKU CH-QP8C-73TV8

A 360-degree rotatable universal joint connects a 4 mm motor shaft to a 3 mm propeller shaft in RC aircraft or boat models, supplied as a pair of metal connectors weighing 17 g

  • Product typeOther Accessories
  • 360-degree rotation gives full directional freedom for RC motor linkages
  • 4 mm by 3 mm bore fits common motor shafts and propeller adapters
  • Metal construction resists wear under high-RPM vibration loads
  • 17 g pair adds minimal mass to lightweight airframes or hulls
  • Two joints included so both drive lines can be upgraded at once

360-degree rotatable RC joint

This two-piece universal joint connector provides full 360-degree rotation for RC motor shafts. It is designed for hobbyists building or repairing airplane and boat models that require flexible power transmission. The metal construction delivers durability for repeated use in vibration-prone applications. Each pack supplies two identical joints for dual-motor setups or spares.

4mm by 3mm shaft compatibility

The connector accepts a 4mm motor shaft on one side and a 3mm driven shaft on the other. This fixed sizing means it cannot adapt to other diameters without separate couplers or modifications. The side thread diameter measures 3mm (0.12in), limiting mounting options to matching hardware. Builders must verify their specific shaft sizes before installation.

Compact metal construction

The oval body measures 2.3cm by 0.9cm (0.9in by 0.35in) and weighs 17g for the pair. Its small footprint fits inside tight fuselage or hull compartments where space is limited. The silver-tone metal handles typical hobby motor torque but is not rated for high-power combustion engines. Excessive radial loads or impact forces may exceed the joint's structural limits.

How it compares

Measured against everything we stock in Boat Engine Components & Locks, at today’s prices. Recalculated every night.

Price $6.99
Typical for this category: the median of 21 items is $6.99.

Specifications

Product
Brand nameUnique Bargains
Product typeOther Accessories

Questions about this item

Should I pick the 3 mm side thread or a different diameter for my motor shaft?

The connector has a 3 mm side thread diameter, so it fits shafts or mounts with that exact thread size.

How much movement does the 360 degree rotatable joint actually allow once installed?

The universal joint rotates freely through 360 degrees, letting the motor output turn in any direction without binding.

What does the 3 mm thread cap in terms of compatible hardware?

It limits use to components with a matching 3 mm thread; larger or smaller threads will not engage properly.

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