Lonffery Trailer 312L Shackle Strap Kit — 4-Pack 312L Straps with EQ-E1 Bushings & Hardware for 3,500–7,200 lb Axles

Lonffery Trailer Alex Shackle Kit is a complete 312L shackle strap set with bushings and hardware designed to mount double-eye leaf springs on trailers with 3,500–7,200 lb axles.

This kit bundles the parts most trailer owners need to replace worn shackle straps or fit new leaf springs. The package combines four heavy-duty 312L shackle straps, compatible EQ-E1 bushings, and the bolts and nuts required for a straightforward installation. Components are sized for typical light- to medium-duty trailers and built to simplify alignment, service, and long-term use.

What exactly comes in the Lonffery 312L shackle strap kit?

The kit supplies hardware and replacement straps so you can service both sides of a trailer axle. Everything ships together so you won't need to buy extra bushings or fasteners.

• Four 312L shackle straps (4-3/8" long, 1-1/4" wide)
• Four EQ-E1 rubber bushings to cushion pivot points
• Six 9/16" bolts with matching nuts for mounting
• Parts sized to fit typical 3,500–7,200 lb axles

How will these shackle straps fit my trailer and springs?

Straps are manufactured to match common double-eye leaf spring setups found on many utility, boat, and cargo trailers. The 4-3/8" length and 1-1/4" width are standard dimensions that align with most hanger and spring eye spacing on specified axle ranges.

• Fits double-eye leaf springs used on 3,500–7,200 lb axles
• 312L dimensions: 4-3/8" long, 1-1/4" wide
• Includes EQ-E1 bushings to match standard spring eyes
• Hardware count supports both sides of the axle without extra purchases

How difficult is installation and what tools will I need?

Installation is engineered for straightforward replacement of worn shackles and bushings. With common hand tools and basic mechanical experience, many users can complete the swap in a single afternoon. Follow proper jacking and safety procedures before starting work under a trailer.

• Requires standard sockets or wrenches for 9/16" bolts
• No special presses needed thanks to bolt-on bushings
• Designed for one-person or two-person install depending on jack availability
• Clear parts labeling reduces trial-and-error during assembly

What load range and use cases are these shackles designed for?

The Lonffery 312L straps are intended for light- to medium-duty trailers and axles commonly rated between 3,500 and 7,200 pounds. They’re suitable for replacement on utility trailers, boat trailers, cargo haulers, and similar rigs where double-eye leaf springs are used.

• Appropriate for trailers within the 3,500–7,200 lb axle range
• Best for recreational and commercial light-duty towing needs
• Not specified for heavy-duty commercial truck applications
• Use with matching spring and axle ratings for safe operation

Who is this for: The Lonffery Trailer Alex Shackle Kit suits trailer owners, small-fleet managers, and do-it-yourself mechanics who need a reliable, complete replacement for worn shackle straps. If you maintain utility, boat, or cargo trailers with double-eye leaf springs and axles in the 3,500–7,200 lb range, this kit gives you the straps, bushings, and bolts required to restore pivot points with minimal additional purchases. It’s also a practical spare-parts kit to keep on hand for on-the-road repairs and scheduled suspension maintenance.