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SeaStar HK6400-4 Hydraulic Marine Steering Kit

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  • HC5345-3 SeaStar Cylinder that is included in kit
  • HH5271-3 SeaStar Hydraulic Helm Pump that is included in kit
  • SeaStar HA5430H 2 quarts are included in the kit
MSRP: $1,699.99
— You save $250.00
Typically Ships in 1-2 Business Days - Use Stock Inquiry Page for Availability


SeaStar HK6400-4 Hydraulic Marine Steering Kit

The SeaStar Outboard steering kit (HK64004) is unmatched in comfort and control for use on single and dual non-power assisted outboard engines up to 350HP (700 combined HP for counter-rotating duals) that have ABYC standard engine tilt tube.

Seastar Steering Update to -4

The latest series of kits has been redesigned to provide a better experience for the vessel operator:

  • The new patent-pending valve technology ensures tighter, quieter, and more responsive steering, while minimizing the potential for chattering when dealing with overrunning steering loads.
  • The helms now feature more durable check valves, making the entire steering system more resilient to the rigors of trailering.
  • Revamped the design of these helms to enhance their aesthetics, and has introduced a new fill port plug design for easier maintenance.
  • You can find the updated HK6400-4 STEERING KITS HERE
  • You can still purchase the part from this page, you will be shipped the updated helm
  • HK6400-4 replaces the HK6400A-3, HK6400 and is in a direct replacement. 


  • Unmatched low friction hydraulic steering system.
  • 5 turns lock-to-lock for single cylinder use.
  • The HH5271-3 front mount helm pump only needs a 3" cutout in the dash
  • Standard 3/4" Taper shaft on the helm pump
  • Can be upgraded to dual station and/or dual outboards


  • Suitable for boats that travel up to speeds of 60MPH
  • Helm Pump: 1.7 cubic inches
  • Stainless Steel shaft
  • 1000 PSI rating for helm and cylinder
  • Cylinder: 8.3 cubic inches
  • For boats that reach speeds up to 60MPH, for boats over 60MPH, purchase the HK7500A-3

Downloads Section:

  • SeaStar Front Mount Cylinder Installation Manual [PDF]
  • SeaStar Front Mount Helm Pump Installation Manual [PDF]

Will This Cylinder Work on my Boat?


  • No Sales Tax on Purchases Outside of California
  • Shipping times on pages only apply to paid shipping
  • Expert Customer Service
  • Formerly Teleflex, Seastar is now Dometic Marine

International Customers: We Ship Worldwide, Shipping Cost May Quote Too High on Our Web Site, contact us for a quote.


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Warranty Information

Seatech Marine Products is an authorized dealer for Dometic that distributes Seastar Products, this part has a 2 Year Limited Warranty from them. Please visit their website for full details:
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