SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder

SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder

The Dometic SeaStar HC53453 is a high-performance front mount hydraulic steering cylinder designed for single, twin, or triple outboard engine installations. Built to meet the demands of today’s heavier, higher-horsepower engines, this cylinder features robust construction, a new 8-hole end gland sealing system, and positionable stainless steel ORB fittings for superior performance and easy installation.

With enhanced durability, improved hose routing, and compatibility with all SeaStar helm pumps and power assist systems, the HC5345-3 is ideal for center console boats, offshore fishing vessels, and high-performance cruisers.

Key Features & Benefits

• Supports Up to 700 HP (Total Power, Counter-Rotating) – Ideal for single, twin, or triple engine setups.
• Independent Engine Tilt – Allows separate engine tilt control on multi-engine installations.
• Robust & Corrosion-Resistant Design – Engineered to withstand repeated compression and harsh marine environments.
• Upgraded Sealing System – New 8-hole end gland design and proprietary sealing system enhance durability and simplify servicing.
• Positionable Stainless ORB Fittings – Upgraded from 1/4" NPT to -5 ORB stainless steel fittings for easier, leak-free installation and improved hose routing.
• Smooth & Responsive Steering – Designed to work with all SeaStar helm pumps, including Power Assist systems.
• Variable Lock-to-Lock Turns – Adjusts with helm selection to deliver a tailored steering response.
• Warranty: 2 Year Limited
• Made in Canada!

Will This Cylinder Work on My Boat?

Technical Specifications

• Direct Replacement for the HC5345 (earlier generation; “-3” adds -5 ORB ports and internal upgrades)
• Mount Style: Front Mount, Pivoting
• Shaft Diameter: 0.75" (19mm)
• Stroke Length: 8.00" (203mm)
• Cylinder bore: 1.375 in (~35 mm)
• Displacement (fluid volume): 8.34 cu in (136.6 cc)
• Ports / fittings: Positionable stainless ORB hose fittings (-5 ORB); do not use NPT
• Overall dimensions (approx.): width 21-3/4 in (552 mm), depth 4-7/8 in (124 mm), height 2-5/8 in (67 mm)
• Included in the Box: Complete cylinder with fittings, HA5438 Filler Kit & Instruction Manual

Kits That Include the HC5345-3

Spare Parts for the HC5345-3

Downloads & Resources

Related Parts

Other SeaStar Parts

Questions?

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• Formerly Teleflex, SeaStar is now Dometic Marine
• Seatech Marine Products, Inc. is an authorized dealer, and service center for Dometic Marine
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