RJSPHH greaseable trailer spring bolts 9/16 x 3" 14-piece set with knurled shoulder & grease zerk

RJSPHH greaseable spring bolts are grease-zertailed, knurled-shoulder 9/16" x 3" fasteners sold in a 14-piece set to lube and secure trailer leaf-spring connections.

These bolts are engineered to replace standard spring hanger or equalizer hardware on most common trailer axles (2000, 3500, 5200, 6000 and 7000 lb ratings). Each bolt features an M12-1.75 thread, a knurled shoulder that resists rotation in the hanger, and a factory-drilled passage with a grease zerk so you can inject lubricant without disassembly. The set includes lock nuts and a one-year warranty backed by RJSPHH customer support.

How does a greaseable spring bolt improve trailer suspension maintenance?

Greaseable bolts let you add lubricant directly into the bolt shank so pivot points stay lubricated while installed. That reduces wear at the spring-eye interfaces and keeps movement smooth under load.

• Built-in grease zerk for on-vehicle lubrication
• Maintains grease film inside spring eyes and hangers
• Reduces need to remove bolts for periodic greasing
• Compatible with common trailer grease guns

Will these bolts fit my trailer's spring and hanger configuration?

Each bolt is 9/16" diameter with a 3" length and M12-1.75 thread standard, matching many OEM and aftermarket hanger kits. The knurled shoulder is sized to press into hanger brackets so the bolt won’t spin when tightening the lock nut.

• 9/16" (0.5625") outside diameter — standard for many trailers
• M12-1.75 thread pitch for common lock nuts
• Knurled shoulder prevents rotational slip in hangers
• Used on 2000–7000 lb axle classes

How do I install and use the RJSPHH greaseable spring bolts?

Installation follows standard spring bolt procedures: align spring eye, slide the bolt through hanger or equalizer, seat the knurled shoulder, and tighten the included lock nut. After installation you can apply grease through the zerk to fill the bolt channel and lubricate the mating surfaces.

• Slide bolt through spring eye and hanger bracket
• Press knurled shoulder into bracket to stop bolt rotation
• Tighten supplied lock nut to spec (do not over-torque)
• Inject grease via zerk for on-vehicle lubrication

What materials and durability features should I expect?

These bolts are machined for a snug fit and include a grease passage to prolong service life at pivot points. RJSPHH offers a one-year warranty and responsive customer support for any fit or quality questions.

• Durable construction suited to suspension wear points
• Grease channel prevents dry contact inside spring eyes
• Included lock nut secures the assembly against loosening
• 1-year RJSPHH warranty with 24-hour customer response

Who is this for? If you maintain utility trailers, boat trailers, horse trailers or small commercial trailers and want an easier, longer-lasting way to lubricate leaf-spring pivot points, this 14-piece RJSPHH greaseable bolt kit is designed for installers, fleet managers, and DIY trailer owners who prefer on-vehicle servicing and reduced downtime. The size and thread match many common axle classes, making the set a practical replacement kit for preventive maintenance and suspension refurbishing projects.