Trailer Axle Spring Shackle Greaseable Spring Bolt 9/16 x 3

In this review the Greaseable Spring Bolt 9/16 x 3 is evaluated as a practical upgrade for trailer suspension maintenance. The bottom line: it is a straightforward replacement bolt for double eye or slipper style springs that adds a built-in grease zerk to keep pivot points lubricated. Installers and trailer owners who want easier grease access will appreciate the design, while those needing an exact OEM match should check fit and thread carefully before buying.

Key Features

• Greaseable design: The bolt is drilled and fitted with a grease zerk so users can easily inject lubricant to suspension pivot points without disassembly.
• Knurled shoulder: A knurled shoulder prevents the bolt from spinning in the hanger bracket, making installation and tightening more reliable.
• Thread spec: The bolt uses M12-1.75 thread to match many common trailer axle hangers and components on 2000# through 7000# axles.
• Included hardware: Each bolt ships with a lock nut for secure fastening and the grease zerk already installed to start service right away.
• Cross-axle compatibility: The bolt is used on a wide range of trailer axles including 2000#, 3500#, 5200#, 6000# and 7000# ratings for broad applicability.

Who It's For

The greaseable spring bolt is best for DIY trailer owners, small fleet operators, and mechanics who want an easy way to keep shackles and spring eyes lubricated without removing the mount. It suits trailers with double eye or slipper style springs and axle capacities listed in the product description.

Those who require exact OEM length, specific lock features beyond a supplied lock nut, or hardened industrial fasteners should verify dimensions and strength before purchasing. A small number of buyers reported fit and stripping issues, so confirm hanger bore size and torque expectations for heavy duty service.

Pros & Cons

Pros

• Built-in grease zerk makes routine lubrication fast and mess-free.
• Knurled shoulder reduces the chance of the bolt spinning in the hanger during installation.
• Works with a range of common trailer axle ratings, simplifying parts choice for many trailers.

Cons

• Some customers report mixed quality and occasional stripping or nonstandard length, so fit verification is recommended.

Specifications

Our Verdict

The greaseable spring bolt is a practical, value-minded upgrade for trailer owners who want easier suspension maintenance and reliable lubrication access. It saves time at service intervals and fits a broad range of axle ratings, but buyers should confirm dimensions and inspect for proper thread and length to avoid fit or durability issues.

Frequently Asked Questions

Will this bolt fit my trailer axle?
Check that your hanger accepts an outside diameter of 0.5625 in and M12-1.75 thread; verify the 3 in length against your current bolt before ordering.

Does the bolt come with a grease zerk installed?
Yes, the bolt is drilled and includes a grease zerk and a lock nut so it is ready for use out of the box.

Is there a warranty if something is wrong?
Yes, the product includes a 1 year warranty and the seller commits to respond to issues within 24 hours.