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SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder

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SKU:
HC5345-3
Condition:
New
  • SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder
  • SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder
  • SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder
  • SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder
  • SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder
  • SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder
MSRP: $1,091.99
$864.99
— You save $227.00
In Stock - Ships FREE 2 DAY AIR Same Day (Order By 5pm EST M-F)

Description

SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder

Heavy-Duty Hydraulic Steering Cylinder for Single, Twin & Triple Outboard Engines

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.

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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.

Technical Specifications

  • Direct Replacement for the HC5345 (-3 part number adds -3 ORB fittings & internal upgrades for longevity and owner experience)
  • Mount Style: Front Mount, Pivoting
  • Shaft Diameter: 0.75" (19mm)
  • Stroke Length: 8.00" (203mm)
 

Downloads & Resources

  • SeaStar Hydraulic Front Mount Cylinder Installation [PDF] 
  • SeaStar Single Outboard Engine Hydraulic Cylinder Application Guide [PDF] 
  • SeaStar Front Mount Cylinder Fill and Bleeding Instruction [PDF]

Basic Compatibility Chart (Single Engine)

Engine Manufacturer Horsepower Range Notes
Yamaha Up to 300 HP Fits most 4-stroke & 2-stroke models with front mount steering
Mercury/Mariner Up to 300 HP Includes Optimax, ProXS, and 4-stroke models
Honda Up to 300 HP Fits all BF series within HP range
Suzuki Up to 300 HP DF series and older 2-stroke models
Evinrude/Johnson Up to 300 HP E-TEC, G2, and carbureted models
Tohatsu/Nissan Up to 250 HP All outboards with compatible bracket spacing
Multi-Engine Setups Per engine ratings Requires tie bar kit (HA5430 or HA5445) for dual/triple engines

Ensure This Cylinder Will Work

LINK Link Description
WEB LINK Application Guide
WEB LINK Dometic SeaStar Hydraulic Parts Lookup
PDF LINK SeaStar Hydraulic Steering Selection Guide
WEB LINK Tech Support Page (First Link)
PDF LINK  

Included in the Box

  • HC5345-3 Hydraulic Steering Cylinder
  • HA5438 Remote Fill Kit
  • Pre-installed -5 ORB Adjustable Stainless Fittings
  • Installation Instructions

Replacement & Related Parts

Part Number Description
Power Assist Units Latest Gen Power Assists
Auto Pilot Units SeaStar Autopilots
Power Assist Autopilot Combos SeaStar PA/AP Combos
SeaStar Hose Hose for SeaStar & BayStar
SeaStar Helm Pumps SeaStar & BayStar Helms
SeaStar Cylinders SeaStar & BayStar Cylinders

Questions?

  • No Sales Tax on Purchases Outside of California
  • Buy Now Pay Later with Affirm or PayPal Pay Later
  • Formerly Teleflex, Seastar is now Dometic Marine
  • Seatech Marine Products, Inc. is an authorized dealer, and service center for Dometic Marine
  • FREE 2 Day Air Shipping to the Lower 48 States, USPS Priority Mail to AK, HI, USVI & Puerto Rico

International Customers: We Ship Worldwide, Shipping Cost May Quote Too High on Our Website, 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: https://www.dometic.com/en-us/outdoor/support/warranty-statements
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2 Reviews

  • 4
    Replacement of same item

    Posted by Jack Bosch on 8th Aug 2020

    Works fine

  • 5
    HC5345-3

    Posted by Thomas F. on 5th Jun 2019

    Thank you for the timely delivery, the cylinder is working great.

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