SeaStar HC5347-3 Outboard Front Mount Cylinder (115-130HP Honda)

SeaStar HC5347-3 Outboard Front Mount Cylinder (115-130HP Honda)

The Dometic SeaStar HC53473 is a high-performance, front-mount (pivoting) hydraulic steering cylinder designed for demanding outboard installations-including heavy single, twin, or triple engine setups. Like the rest of SeaStar’s upgraded -3 lineup, this model features enhanced corrosion resistance, a robust 8-bolt end-gland sealing system, and positionable stainless-steel -5 ORB hose fittings for cleaner routing and easier installation.

Engineered to exceed the performance of legacy models like the HC5347, the HC5347-3 is a direct replacement with upgraded internals and fittings-perfect for offshore boats, performance hulls, or repowers involving high-output outboards. It pairs seamlessly with all SeaStar helm pumps, tilt helms, and power assist units, delivering smooth, precise hydraulic control at any speed.

Key Features & Benefits

• Supports up to 700 HP (total, counter-rotating) - system/installation dependent
• Independent Engine Tilt for multi-engine configurations
• Robust, Corrosion-Resistant Construction for tough offshore and saltwater use
• Upgraded 8-Hole End-Gland Sealing System for improved serviceability and long-term performance
• Positionable Stainless -5 ORB Fittings (upgrade from 1/4" NPT) - allows cleaner, more secure hose routing
• Smooth, Predictable Steering Control - compatible with all SeaStar helm pumps, including Power Assist
• Variable Lock-to-Lock Turns based on helm size
• Warranty: 2-Year Limited
• Made in Canada

Technical Specifications

• Direct Replacement: HC5347 (earlier version; “-3” adds -5 ORB ports and internal enhancements)
• Mount Style: Front Mount, Pivoting
• Shaft Diameter: 0.75" (19 mm)
• Stroke Length: 8.00" (203 mm)
• Cylinder Bore: 1.375" (~35 mm)
• Displacement (Fluid Volume): 8.34 cu in (136.6 cc)
• Ports / Fittings: Positionable stainless -5 ORB hose fittings (do not use NPT)
• Overall Dimensions (approx.): Width 21-3/4" (552 mm), Depth 4-7/8" (124 mm), Height 2-5/8" (67 mm)
• Weight (approx.): 9.5 lb
• Included in the Box: Complete cylinder with -5 ORB fittings & full installation manual

Will This Cylinder Work on My Boat?

Downloads & Resources

Spare Parts for the HC5347-3

Related Parts

Other SeaStar Parts

Questions?

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