{"product_id":"seastar-hc5312-3-inboard-7-stroke-7-2-cubic-inch-cylinder-model-ba125-7atm-hp6023-seal-kit-1-hc53123","title":"SeaStar HC5312-3 Inboard Hydraulic Steering Cylinder — 7\" Stroke, 7.2 cu. in.","description":"\u003ch2\u003eSeaStar HC5312-3 Inboard Hydraulic Steering Cylinder\u003c\/h2\u003e\u003cp\u003eThe SeaStar HC5312-3 is a heavy-duty hydraulic steering cylinder designed for inboard-powered vessels with single or dual rudder configurations. With a 7-inch stroke and 7.2 cubic inch displacement, it delivers smooth, precise steering response suited to a wide range of inboard applications.\u003c\/p\u003e\u003cp\u003eThe HC5312-3 features two-axis articulation, allowing the cylinder to flex with the rudder's natural movement — reducing stress on the steering system and extending service life. Bleeder fittings are included, simplifying air purging during installation and routine maintenance.\u003c\/p\u003e\u003cp\u003eAn integrated autopilot interface port allows straightforward connection to compatible autopilot systems without additional adapters on most installations.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e HC5312-3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Inboard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStroke:\u003c\/strong\u003e 7 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 7.2 cubic inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Reference:\u003c\/strong\u003e BA125-7ATM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Kit:\u003c\/strong\u003e HP6023 (sold separately)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRudder Compatibility:\u003c\/strong\u003e Single and dual rudder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eArticulation:\u003c\/strong\u003e Two-axis\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBleeder Fittings:\u003c\/strong\u003e Included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutopilot Interface:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.42 kg (5.34 lbs)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eBest Use Cases\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eInboard vessels with single or dual rudder steering requiring a full hydraulic cylinder replacement or upgrade\u003c\/li\u003e\n\u003cli\u003eBoats where two-axis articulation is needed to accommodate rudder geometry or reduce system stress\u003c\/li\u003e\n\u003cli\u003eInstallations where autopilot integration is planned or already in place\u003c\/li\u003e\n\u003cli\u003eFull hydraulic steering system builds on inboard-powered cruisers, sportfishers, and workboats\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eIn the Box\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eHC5312-3 Hydraulic Steering Cylinder with bleeder fittings installed\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eNote: The HP6023 seal kit is recommended as a service item and is available separately. Always follow the manufacturer's installation guide and consult a qualified marine technician for installation.\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThis cylinder is the go-to choice for inboard rudder applications where two-axis articulation is required — particularly on twin-rudder vessels or installations where the cylinder mount angle doesn't align perfectly with the rudder arm. The included bleeder fittings are a practical advantage during commissioning. Stock the HP6023 seal kit alongside this unit for customers doing a full service or rebuild. Before ordering, confirm the customer's helm pump displacement matches the 7.2 cu. in. cylinder rating, and verify rudder arm geometry to ensure correct stroke utilization. For dual-rudder setups, confirm whether a second cylinder or a tie-bar arrangement is being used.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51199425740836,"sku":"1-HC53123","price":1350.89,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/1-HC53133.jpg?v=1785605230","url":"https:\/\/marisolmarine.com\/products\/seastar-hc5312-3-inboard-7-stroke-7-2-cubic-inch-cylinder-model-ba125-7atm-hp6023-seal-kit-1-hc53123","provider":"Marisol Marine Company","version":"1.0","type":"link"}