6400 Control Cables
What Are 6400 Control Cables?
6400 series control cables are a specialized type of push-pull mechanical cable used primarily in marine and RV steering and control systems. 6400 control cables are engineered to translate lever and wheel movements at the helm into precise throttle, shift, and steering action at the engine — making them a critical link in any mechanical control system.
These cables are distinguished by their 5/16-24 threaded terminal ends and a 4-inch nominal travel specification, which determines how far the inner cable moves when the control lever is actuated. The 6400 designation also indicates an 8-inch minimum bend radius — meaning the cable can be routed through tighter curves than many alternatives, making them well-suited for the demanding layouts common in boats and RVs.
How 6400 Control Cables Work
Like all push-pull cables, the 6400 series consists of an outer sleeve and an inner sliding core. The outer casing holds a fixed length, so as you move the control lever, the inner cable pushes or pulls to actuate the connected mechanism — whether that's a gear selector, throttle body, or steering actuator. The quality of that inner-to-outer fit directly determines how responsive and precise your controls feel at the helm.
Premium 6400 cables feature a splined inner core construction that reduces the contact surface between moving components, dramatically cutting friction and lost motion. This results in crisp, direct control feel even on the longest or most complex cable runs aboard larger vessels or RVs. Outer jackets are typically made from high-density polyethylene (HDPE), which resists UV radiation, chemicals, and the harsh moisture exposure common in marine environments.
Common Applications
- Marine transmission and shift controls — one of the most common uses for the 6400 series
- Throttle controls on inboard and sterndrive engines
- Jet boat gate controls and other specialized drive configurations
- Legacy engine systems from manufacturers such as BMW Marine, Chrysler Marine, and early Westerbeke and Yanmar installations
What to Look for When Buying 6400 Control Cables
Getting the right cable requires matching more than just the series number. The end fitting style matters: clamp-clamp (CC) cables have clamp-type fittings on both ends, while bulkhead-clamp (BC) cables have one bulkhead fitting and one clamp — choose based on how your control and engine are mounted. Cable length is equally critical; measure the full routed path carefully, as too much slack or too little length can affect performance and safety. Finally, look for cables that meet or exceed applicable industry standards and are built with corrosion-resistant, marine-grade materials to ensure reliable operation season after season.
Top Brands in 6400 Control Cables
Teleflex — now operating under the SeaStar Solutions and Dometic Marine umbrella — is the benchmark name in marine control cables. For decades, Teleflex Marine set the standard for throttle, shift, and steering cable quality, and their 6400 series TFXtreme cables carry that heritage forward with a patented splined-core design, stainless steel conduit fittings, and heavy-duty HDPE outer casings built for demanding marine and RV applications.