SeaStar HK64004 Complete Outboard Hydraulic Steering Kit
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SeaStar HK64004 Complete Outboard Hydraulic Steering Kit
The SeaStar HK64004 is a complete hydraulic steering kit for outboard-powered boats — one of the most widely installed hydraulic steering systems in the marine industry. It delivers smooth, precise steering on high-performance hulls and is a factory-fitted choice on many centre console, cruiser, and offshore fishing boat builds.
This kit includes everything needed to get a hydraulic steering system up and running: the helm pump, pivot cylinder, and hydraulic oil. Hoses are sold separately to allow for custom routing to suit your specific installation.
Key Specifications
- Kit Model: HK64004
- Application: Single and dual non-power-assisted outboard engines
- Max Engine Power: Up to 350 HP per engine (700 HP combined for counter-rotating duals)
- Engine Tilt Tube: ABYC standard required
- Lock-to-Lock Turns: 5
- Helm Footprint: 4-7/16" (requires 3" dash hole)
- Shaft: Standard 3/4" tapered
- Max Speed: Up to 60 MPH
- Dual Station: Compatible (additional helm, hose & fittings required)
- Dual Engine: Compatible — independent engine tilt supported (tie bar kit and extra hardware required)
- Weight: 9.88 kg (21.8 lbs)
What's Included
- HH52714 — SeaStar Helm, 1.7 cu. in.
- HC53453 — SeaStar Pivot Cylinder
- HA5430 (×2) — Hydraulic Oil, 1 Litre each
Note: Hoses (HO51xx series) are sold separately. For dual-engine installations, a tie bar kit and additional hardware are required. For dual-station setups, an additional helm, hose, and fittings are required. Consult a qualified marine technician for installation.
Boat Type Compatibility
Designed for centre consoles, runabouts, cruisers, and offshore fishing boats. Suitable for single and dual outboard configurations up to 350 HP per engine.
Parts Desk Insights
This is the best-selling complete hydraulic steering kit for outboard applications and the right starting point for most single or dual outboard builds under 350 HP per engine. When a customer orders this kit, always confirm they also order the correct HO51xx hose set for their installation — hoses are not included and are the most commonly missed item. For dual-engine setups, add the appropriate tie bar kit to the order. For dual-station builds, a second helm, additional hose, and fittings will be needed. The adjustable O-ring fittings on both the helm and cylinder simplify installation and allow post-install reorientation, which is a strong selling point for DIY installers. Verify the engine has an ABYC standard tilt tube before confirming compatibility.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.