Lonffery Trailer Shackle Strap Kit 312L — 4-Pack 4-3/8" x 1-1/4" with EQ-E1 Bushings & Bolts, for 3,500–7,200 lb Trailers

Lonffery Trailer Alex Shackle Kit 312L is a complete four-shackle set with bushings and hardware designed to replace or upgrade the double-eye leaf spring mounting on trailers rated roughly 3,500–7,200 lb.

This Lonffery kit supplies the common replacement parts needed to restore or improve a trailer’s suspension link points: four 312L shackle straps, EQ-E1 bushings to cushion movement, and six 9/16" bolts with matching nuts. The components are sized and packaged for fast installation on many light- to medium-duty utility, boat, and cargo trailers. The kit focuses on durability and fit: each shackle strap measures 4-3/8" long by 1-1/4" wide and is specified to work with standard double-eye leaf spring setups.

What exactly is included in the Lonffery 312L shackle strap kit?

The kit ships with every part required to replace the most common shackle strap assemblies on trailers with double-eye leaf springs. It groups the straps, bushings, and fasteners so you don’t have to source separate components.

• Four 312L shackle straps (4-3/8" long x 1-1/4" wide).
• Four EQ-E1 rubber or polyurethane bushings to reduce metal-on-metal wear.
• Six 9/16" bolts plus matching nuts to secure the straps and spring assembly.
• Packaged to fit trailers commonly rated between 3,500 lb and 7,200 lb axles.

How does this kit simplify trailer suspension maintenance?

By providing matched straps, bushings, and hardware in one package, the Lonffery kit removes the guesswork of compatibility and reduces time spent shopping for parts. The pre-selected dimensions and included bushings mean installers can quickly swap worn components and restore proper spring movement.

• All parts arrive together to minimize downtime during repairs.
• Standardized strap size suits common double-eye leaf spring setups.
• Included bushings protect against vibration and wear.
• Extra fasteners allow for secure reassembly and replacement of corroded hardware.

Will these shackle straps fit my trailer and axle weight?

The 312L shackle straps in this kit are engineered to match typical double-eye leaf spring spacing and fit many light- and medium-duty trailers. They are commonly used on setups with axles rated between about 3,500 and 7,200 pounds, but you should confirm measurements and rating compatibility before installation.

• Strap length: 4-3/8" — confirm against your existing strap length.
• Strap width: 1-1/4" — matches common leaf spring eye widths.
• Intended axle ratings: typically 3,500–7,200 lb; verify with your trailer specs.
• Includes six bolts to ensure secure mounting; replace any bent or corroded fasteners.

How straightforward is installation for a DIYer or shop technician?

Installation is designed to be straightforward: remove the old straps and bushings, position the new straps with EQ-E1 bushings, and tighten the provided 9/16" bolts and nuts to the manufacturer’s torque specs. Basic hand tools and a jack or lift for safety are usually sufficient for a single-axle trailer repair.

• Remove old hardware and clean mounting surfaces before fitting new parts.
• Use supplied bolts and nuts; torque to the trailer manufacturer’s specification.
• Replace one side at a time to keep alignment and ride height consistent.
• Inspect springs and eye bolts while performing the replacement.

Who is this for: The Lonffery Trailer Alex Shackle Kit 312L is aimed at trailer owners, fleet managers, and mobile repair shops who need a reliable, ready-packaged replacement for worn or damaged shackle straps on light- to medium-duty trailers. It’s well-suited for DIY mechanics familiar with trailer suspension work and professionals who want to keep a service-ready kit on hand for quick repairs.