{"product_id":"4-inch-black-rubber-spool-roller-with-5-8-bore-fits-boat-trailers-replaces-yates-23739","title":"4-inch Black Rubber Spool Roller with 5\/8\" Bore – Fits Boat Trailers (Replaces Yates 23739)","description":"\u003csection\u003e\n\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis heavy-duty \u003cstrong\u003e4-inch black rubber spool roller\u003c\/strong\u003e is designed for boat trailers, featuring a 5\/8-inch bore for standard roller shafts. Its spool design helps guide the boat during loading and unloading, providing smooth and controlled movement while preventing hull drift.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct aftermarket replacement for Yates 23739, Valmar 80782, and Craton SK344 rollers.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003eMounts on a 5\/8\" diameter roller shaft.\u003c\/li\u003e\n    \u003cli\u003eConstructed from durable black rubber for longevity.\u003c\/li\u003e\n    \u003cli\u003eSpool shape helps center the boat on the trailer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket brands.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYates\u003c\/td\u003e\n        \u003ctd\u003e23739\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eValmar\u003c\/td\u003e\n        \u003ctd\u003e80782\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCraton\u003c\/td\u003e\n        \u003ctd\u003eSK344\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eBoat Trailer Spool Roller\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eMounts on 5\/8\" diameter roller shaft\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eBlack Rubber\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e4\" width x 2-7\/8\" diameter with 5\/8\" bore\u003c\/dd\u003e\n  \u003cdt\u003eColor\u003c\/dt\u003e\n\u003cdd\u003eBlack\u003c\/dd\u003e\n  \u003cdt\u003eMounting Hole\u003c\/dt\u003e\n\u003cdd\u003e5\/8 inch (0.625\")\u003c\/dd\u003e\n  \u003cdt\u003eOverall Length\u003c\/dt\u003e\n\u003cdd\u003e4 inches\u003c\/dd\u003e\n  \u003cdt\u003eCompatibility\u003c\/dt\u003e\n\u003cdd\u003eWorks with most boat trailer frames and crossmembers when used with proper mounting hardware\u003c\/dd\u003e\n  \u003cdt\u003eInstallation Hardware\u003c\/dt\u003e\n\u003cdd\u003eRequires 5\/8\" diameter roller shaft and pal nuts (sold separately)\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e1 x 4-inch Black Rubber Spool Roller (23739)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eThis spool roller is typically mounted on a 5\/8\" diameter roller shaft (a 5-1\/4\" long shaft is common for a 4\" roller) that fits into a 4\" roller bracket. The roller and shaft are secured using 5\/8\" pal nuts, which are hammered onto each end of the shaft. This entire bracket assembly then attaches to the trailer's crossmember with U-bolts or other appropriate mounting hardware.\u003c\/p\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if this roller will fit my trailer?\u003c\/summary\u003e\n  \u003cp\u003eVerify the dimensions of your current roller and the diameter of its shaft. This roller has a 4-inch width and fits a 5\/8-inch diameter shaft. If your measurements match, it should fit.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat other parts are needed for installation?\u003c\/summary\u003e\n  \u003cp\u003eTo install this roller, you will need a 5\/8\" diameter roller shaft and corresponding 5\/8\" pal nuts to secure it. The bracket that holds the shaft will require U-bolts or other hardware to attach to the trailer frame.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhen should I replace my trailer rollers?\u003c\/summary\u003e\n  \u003cp\u003eInspect your rollers regularly. You should replace them if you see signs of significant wear, deep cracks, flat spots, or if they no longer spin freely. Worn-out rollers can damage your boat's hull.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this black rubber roller mark my boat hull?\u003c\/summary\u003e\n  \u003cp\u003eBlack rubber rollers are very durable but can sometimes leave scuff marks on light-colored gelcoat or aluminum hulls. If this is a primary concern, consider non-marking polyurethane rollers as an alternative.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the load capacity of this roller?\u003c\/summary\u003e\n  \u003cp\u003eA specific load rating for this roller is not available. However, it features a heavy-duty rubber construction designed to handle a wide range of boats commonly transported on trailers.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the difference between a spool roller and a keel roller?\u003c\/summary\u003e\n  \u003cp\u003eSpool rollers, like this one, have raised edges that act as self-centering guides to keep the boat aligned on the trailer. Keel rollers are generally smoother and v-shaped or flat to support the boat's keel directly.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\n  \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n    \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003ePro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n    \u003cli\u003eFast Global Fulfillment — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003eManufacturer-Direct Value — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50717886513467,"sku":"19BT009","price":15.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/4_Inch_Boat_Trailer_Spool_Roller_by_5-8_Inch_Shaft_-_JLM_MARINE-8287969.png?v=1762937373","url":"https:\/\/seasierra.com\/products\/4-inch-black-rubber-spool-roller-with-5-8-bore-fits-boat-trailers-replaces-yates-23739","provider":"SeaSierra","version":"1.0","type":"link"}