{"product_id":"4-boat-trailer-spool-stationary-keel-roller-for-2-trailer","title":"Wonwopn keel spool roller 4\" roller for 2\" tongue, 4\" rubber spool with hot-dipped galvanized bracket","description":"\u003cp\u003e\u003cstrong\u003eWonwopn's 4\" spool keel roller is a heavy-duty roller assembly with a 4\" black rubber spool and a hot-dipped galvanized steel bracket that bolts to a 2\" trailer tongue or frame to ease boat loading and support the keel.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis roller assembly pairs a durable 4\" rubber spool with a robust hot-dipped galvanized bracket engineered for marine environments. The unit uses a 5\/8\" steel shaft and mounts with two 1\/2\" diameter bolt holes spaced 2-1\/2\" on center, designed to fasten securely to 2\" trailer tongue frames. The bracket’s hot-dipped zinc coating (approximately 3–5 mil thick) provides long-lasting corrosion resistance and a dull, rugged finish that distinguishes it from thinner cold-galvanized parts.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this keel roller make launching and retrieving easier?\u003c\/h3\u003e\n\u003cp\u003eThe rubber spool reduces friction between the boat hull and trailer, guiding the keel smoothly when loading and unloading. It supports the keel in a centered position to prevent lateral slipping and helps the boat align on the trailer during winching.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e4\" rubber spool reduces chafing and provides cushioning.\u003c\/li\u003e\n  \u003cli\u003e5\/8\" shaft for stable rotation under load.\u003c\/li\u003e\n  \u003cli\u003eBracket positions roller at keel contact points for reliable guidance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes the bracket corrosion resistant and different from cheaper options?\u003c\/h3\u003e\n\u003cp\u003eThe bracket is hot-dipped in zinc, producing a thicker zinc layer—typically 3–5 mil—covering the entire part for superior protection against rust. Unlike cold-galvanized finishes, which are thinner and glossy, hot-dipped parts appear dull and textured but last longer in wet, salty conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHot-dipped zinc coating (3–5 mil) for long-term corrosion resistance.\u003c\/li\u003e\n  \u003cli\u003eFull-coverage coverage protects edges and mounting surfaces.\u003c\/li\u003e\n  \u003cli\u003eRugged, dull finish indicates hot-dip treatment versus bright cold-galvanized look.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this unit fit my trailer and how do I mount it?\u003c\/h3\u003e\n\u003cp\u003eThis spool roller is designed to attach to standard 2\" trailer tongue frames using two bolts through the bracket’s mounting holes. The mounting holes accept 1\/2\" diameter bolts and are spaced 2-1\/2\" on center to line up with compact bracket installations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits 2\" trailer tongue frames with bolt-on installation.\u003c\/li\u003e\n  \u003cli\u003eMounting hole diameter: 1\/2\" — use appropriate grade bolts and lock hardware.\u003c\/li\u003e\n  \u003cli\u003eHole spacing on bracket: 2-1\/2\" center-to-center for positioning accuracy.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable is the roller and what are its key dimensions?\u003c\/h3\u003e\n\u003cp\u003eThe roller’s 4\" length and rubber construction provide a balance of contact area and flexibility, while the 5\/8\" shaft maintains alignment and resists bending under normal trailer loads. The overall assembly is built for repeated launches and trailering in coastal or inland waters when properly installed.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRoller length: 4\" for broad keel support.\u003c\/li\u003e\n  \u003cli\u003eShaft diameter: 5\/8\" for reliable rotation and strength.\u003c\/li\u003e\n  \u003cli\u003eBracket material: hot-dipped galvanized steel for marine durability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This Wonwopn spool keel roller is aimed at boat owners, DIY trailer-maintenance enthusiasts, and marinas that need a compact, corrosion-resistant keel support for small to medium boats. It’s especially suitable for trailers with 2\" tongues that require a bolt-on roller to simplify launching, protect the keel, and extend trailer hardware life in corrosive environments.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What bolt size does this roller use?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Use 1\/2\" diameter bolts through the bracket mounting holes; choose marine-grade hardware and locking nuts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the bracket corrosion resistant?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—the steel bracket is hot-dipped in zinc with a 3–5 mil coating for improved rust protection over cold galvanizing.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Wonwopn","offers":[{"title":"Default Title","offer_id":48021994602657,"sku":"B0D5TVQPLH","price":84.51,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0758\/6532\/5729\/files\/wonwopn-front-view-assembly.jpg?v=1791320412","url":"https:\/\/canadiansporting.ca\/products\/4-boat-trailer-spool-stationary-keel-roller-for-2-trailer","provider":"Canadian Sporting","version":"1.0","type":"link"}