{"product_id":"rjsphh-trailer-greaseable-spring-bolts-9-16-x-3-14pcs-knurled-shoulder-grease-zerk-for-double-eye-slipper-springs","title":"RJSPHH Trailer Greaseable Spring Bolts 9\/16 x 3 (14pcs) — Knurled Shoulder, Grease Zerk for Double-Eye \u0026 Slipper Springs","description":"\u003cp\u003e\u003cstrong\u003eRJSPHH Trailer Axle Greaseable Spring Bolt 9\/16 x 3 is a knurled, grease-zerk equipped mounting bolt designed to lubricate and secure double-eye or slipper springs on most common trailer axles.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese 14 bolts (9\/16\" x 3\") are built for trailer suspension points where periodic lubrication keeps movement smooth and reduces wear. Each bolt features a knurled shoulder to stop rotation in the hanger bracket, an integral grease zerk for easy servicing, and a lock nut to maintain clamping force. Compatible with many popular axle ratings, these bolts simplify maintenance and extend the life of spring hangers and equalizers.\u003c\/p\u003e\n\n\u003ch3\u003eWhich trailer axles and springs work with these greaseable bolts?\u003c\/h3\u003e\n\u003cp\u003eThese bolts are compatible with many common trailer axle ratings and spring types used on light- to medium-duty trailers. They suit double-eye and slipper springs when mounted to hanger brackets or equalizers, installing as a direct replacement in most setups that accept a 9\/16\" x 3\" bolt.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits axles typically rated 2000#, 3500#, 5200#, 6000#, 7000#\u003c\/li\u003e\n  \u003cli\u003eDesigned for double-eye and slipper style springs\u003c\/li\u003e\n  \u003cli\u003eStandard M12-1.75 thread pitch for wide compatibility\u003c\/li\u003e\n  \u003cli\u003eKnurled shoulder prevents bolt from spinning during installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the grease zerk improve maintenance?\u003c\/h3\u003e\n\u003cp\u003eThe built-in grease zerk lets you apply lubricant without disassembly, making routine service faster and more effective. Regular greasing reduces friction between the spring and hanger, helping prevent premature wear and noisy operation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGrease zerk located in the bolt end for direct lubrication\u003c\/li\u003e\n  \u003cli\u003eEnables on-trailer greasing with a standard grease gun\u003c\/li\u003e\n  \u003cli\u003eReduces need to remove bolts for service, saving time\u003c\/li\u003e\n  \u003cli\u003ePromotes smoother pivoting and longer component life\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the bolt’s key construction and safety features?\u003c\/h3\u003e\n\u003cp\u003eEach bolt is machined with a knurled shoulder to lock into the hanger and a matching lock nut to secure the assembly. The M12 thread and 0.5625\" outside diameter ensure strong clamping force and straightforward replacement of worn or non-serviceable hardware.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e0.5625\" outside diameter, M12-1.75 thread\u003c\/li\u003e\n  \u003cli\u003eKnurled shoulder prevents bolt rotation in the hanger bracket\u003c\/li\u003e\n  \u003cli\u003eIncludes grease zerk and lock nut with each bolt\u003c\/li\u003e\n  \u003cli\u003eDrilled and tapped end for grease fittings standard on trailer axles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I install and care for these greaseable spring bolts?\u003c\/h3\u003e\n\u003cp\u003eInstallation follows standard spring hanger procedures: position the spring eye, insert the knurled shoulder bolt so it seats in the hanger, and tighten the lock nut to the vehicle manufacturer's torque specification. Periodic greasing through the zerk keeps the joint operating smoothly; inspect hardware regularly for wear or corrosion.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSeat knurled shoulder fully into hanger to prevent rotation\u003c\/li\u003e\n  \u003cli\u003eTighten lock nut to manufacturer torque specifications\u003c\/li\u003e\n  \u003cli\u003eLubricate through zerk at regular service intervals\u003c\/li\u003e\n  \u003cli\u003eInspect for wear, replace if threads or knurling are damaged\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: RJSPHH's 9\/16\" x 3\" greaseable spring bolts are aimed at trailer owners, fleet managers, and maintenance technicians who need a reliable, serviceable fastener for trailer suspension points. If you maintain light- to medium-duty trailers with double-eye or slipper springs and want an easier way to keep suspension pivots lubricated and secure, this 14-piece kit provides ready-to-install, service-friendly hardware backed by a one-year warranty and customer support for any issues.\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: Are these bolts compatible with my 3500 lb axle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. These 9\/16\" x 3\" greaseable bolts are commonly used on 3500# axles and other ratings listed, for double-eye and slipper springs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I grease these without removing the bolt?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Each bolt has a grease zerk for on-trailer lubrication using a standard grease gun.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"RJSPHH","offers":[{"title":"Default Title","offer_id":48083246678174,"sku":"B0BNGZ2J18","price":51.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/rjsphh-front-packaging-sleeve.jpg?v=1785829577","url":"https:\/\/northtrailauto.ca\/products\/rjsphh-trailer-greaseable-spring-bolts-9-16-x-3-14pcs-knurled-shoulder-grease-zerk-for-double-eye-slipper-springs","provider":"North Trail Auto","version":"1.0","type":"link"}