Siapupy Trailer Shackle Kit – Heavy-Duty Leaf Spring Kit for 3.5K–7.2K Axles | Anti-Rust Coating

Upgraded trailer suspension, simplified

Siapupy’s Trailer Shackle Kit is designed for double-eye springs on tandem axles, covering 3,500–7,200 lb setups. Whether you work on a utility trailer, a boat trailer, or a cargo trailer, this kit aims to make repairs and upgrades straightforward. It’s suitable for use in home garages or professional workshops and pairs with trailer spring hangers for a complete system.

Why you might choose it

• Broad compatibility across axle ranges and trailer types, for maintenance or upgrades.
• All-in-one package that includes equalizers, shackle straps, bushings, bolts, and locking nuts, minimizing add-ons.
• Rugged steel construction with an anti-rust coating to endure wet conditions and salt exposure.

The kit’s precise sizing is designed to help you align components during installation and achieve a secure, reliable fit. With thoughtful details like pre-cut lengths and standard thread sizes, you may experience a smoother replacement process and a solid mounting base for your trailer.

Durable build for everyday use

Constructed from sturdy steel, the parts are finished to resist wear and corrosion, helping them hold up under regular road use. The anti-rust coating adds an extra layer of protection, contributing to longer life for essential suspension pieces in challenging environments.

Fit, size, and installation-friendly design

• Equalizers with 7-3/4" hole spacing.
• Shackle straps measure 4.38" long with 3-1/8" (3.12") hole spacing.
• Bolts run 3-3/8" long; bushings are 9/16" I.D. and 11/16" O.D.; fasteners use 9/16"-18 threads.

Each package also includes an assortment of essential hardware—two long triangular equalizers, eight shackle straps, eight bushings, fourteen bolts, and fourteen locking nuts—so you have what you need to complete a repair or upgrade in one purchase. The locking nuts are designed to resist loosening by ensuring secure engagement from multiple directions, contributing to steadier performance on the road.

Quality and compatibility in one kit

Designed to meet typical trailer operation demands, this kit emphasizes wear and corrosion resistance while delivering a complete, ready-to-install solution for double-eye spring suspensions. The result is a practical option for those seeking a reliable, all-in-one trailer axle upgrade.