{"product_id":"ralzaoto-trailer-axle-bearing-kit-4-set-for-7000-lb-d42-spindles-25580-14125a-bearings-double-lip-seals-10-36-10-10","title":"RALZAOTO Trailer Axle Bearing Kit 4-Set for 7000 lb D42 Spindles — 25580\/14125A Bearings \u0026 Double-Lip Seals (10-36,10-10)","description":"\u003cp\u003e\u003cstrong\u003eRALZAOTO 4 Sets 7000 LB Trailer Axle Bearing Kits supply complete spindle-to-hub hardware for tandem 7000 lb axles with D42 spindles, including bearings, races, double-lip grease seals, cotter pins and tang washers.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese complete bearing kits are designed to replace worn hub internals on trailers rated up to 7,000 pounds per axle with a #D42 spindle. Each kit set combines matched bearing cones and races (25580 \/ 25520 and 14125A \/ 14276), plus robust double-lip grease seals in two common sizes for D42 spindles and all required small hardware. The parts are manufactured for long life, quiet rotation, and improved hub sealing against contamination and grease loss.\u003c\/p\u003e\n\n\u003ch3\u003eWhich trailer axles and spindles are these kits compatible with?\u003c\/h3\u003e\n\u003cp\u003eThis kit targets tandem and single axles rated around 7000 lb that use the D42 spindle profile. Confirm compatibility by matching your spindle ID and bearing numbers on your current hub before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits 1.25\" to 1.75\" spindle diameter ranges typical for 7000 lb axles.\u003c\/li\u003e\n  \u003cli\u003eIncludes bearings 25580 \/ 25520 and 14125A \/ 14276 for common hub combinations.\u003c\/li\u003e\n  \u003cli\u003eContains two grease seal sizes for D42 spindle variations: 10-36 and 10-10.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the double-lip grease seal improve hub reliability?\u003c\/h3\u003e\n\u003cp\u003eThe double-lip seal design creates two sealing edges to keep grease in and dirt and water out of the hub cavity. This reduces the risk of bearing contamination and premature wear, especially in wet or sandy conditions like boating or off-road towing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTwo sealing lips for enhanced protection against moisture and road grime.\u003c\/li\u003e\n  \u003cli\u003eDurable elastomer construction to maintain a tight fit under centrifugal force.\u003c\/li\u003e\n  \u003cli\u003eMinimizes grease loss and lowers maintenance frequency for trailers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat parts are included and how many pieces come with the 4-set pack?\u003c\/h3\u003e\n\u003cp\u003eThe 4-set package supplies everything needed to service two tandem axles or four wheel hubs on a single tandem axle trailer. Parts are supplied in matched groups to ensure correct fit and balanced hub operation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e4 bearing cones 25580 and 4 matching races 25520.\u003c\/li\u003e\n  \u003cli\u003e4 bearing cones 14125A and 4 matching races 14276.\u003c\/li\u003e\n  \u003cli\u003e4 double-lip grease seals sized 10-36 and 4 sized 10-10 for D42 spindles.\u003c\/li\u003e\n  \u003cli\u003e4 cotter pins and 4 tang washers to secure the castle nuts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow will installing this kit affect trailer performance?\u003c\/h3\u003e\n\u003cp\u003eReplacing old bearings and seals with matched, precision parts restores hub concentricity and reduces friction, which helps hubs spin smoothly and quietly. Properly serviced hubs also lower heat build-up during towing and reduce the chance of sudden failures on the road.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRestores correct bearing preload and hub alignment for stable towing.\u003c\/li\u003e\n  \u003cli\u003eReduces operational noise and rolling resistance at highway speeds.\u003c\/li\u003e\n  \u003cli\u003eImproves seal integrity to protect bearings from contaminants and water.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: These RALZAOTO kits are aimed at trailer owners, fleet maintenance teams, and DIY mechanics who maintain boat trailers, utility trailers, RVs, or equipment haulers using 7000 lb axles with D42 spindles. If you need matched bearings, races, seals and hardware to complete a hub rebuild for one or more tandem axles, this 4-set package provides the components and seal options commonly required for reliable, long-term service. For best results verify bearing numbers and spindle size before purchase, and follow torque and packing guidelines when installing.\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: Do these kits fit D42 spindles?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The kit includes seals and bearings sized to work with #D42 spindles commonly used on 7000 lb axles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How many hubs will the 4-set package service?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The 4-set package contains parts for four hubs, suitable for a tandem-axle trailer or multiple single hubs.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"RALZAOTO","offers":[{"title":"Default Title","offer_id":48084009910430,"sku":"B0F9F19KSK","price":94.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ralzaoto-front-packaging-overview.jpg?v=1785843315","url":"https:\/\/northtrailauto.ca\/products\/ralzaoto-trailer-axle-bearing-kit-4-set-for-7000-lb-d42-spindles-25580-14125a-bearings-double-lip-seals-10-36-10-10","provider":"North Trail Auto","version":"1.0","type":"link"}