Lonffery 4-Pack Trailer Axle Spring Perch Seats for 3in Round Axles - Weld-On Heavy-Duty Steel

Lonffery 4-Pack Trailer Axle Spring Perch Seats are weld-on, heavy-duty steel spring perches sized for 3" round trailer axles and sold as a complete 4-piece kit for one axle replacement or upgrade.

This 4-piece kit from Lonffery supplies the key mounting hardware needed to secure leaf springs to a 3-inch round trailer axle. Built from high-strength steel and cut to accurate dimensions, the perches are intended for medium-duty cargo trailers, flatbeds, and small farm trailers. The weld-on design creates a permanent, rigid connection to the axle for consistent spring location and improved towing stability when installed properly.

How do these perches fit a 3" trailer axle?

Each perch is formed with a curved base sized to wrap a 3-inch round axle, and mounting holes aligned for standard spring bolt diameters. The dimensions are measured to ensure a precise, repeatable fit so the spring centers land where intended every time.

• Curved base diameter: 3" to match 3" round axles
• Perch length: 4" long for stable spring seating
• Width: 1.85" for secure spring contact
• Hole diameter: 0.67" to accept common spring bolts

What makes these spring perches durable under load?

Lonffery perches are manufactured from high-strength steel and designed for heavy-duty trailer use. The robust material and simple geometry reduce deformation risk under payload, and a weld-on installation eliminates loosening that can occur with bolt-on alternatives.

• High-strength steel construction for load resistance
• Weld-on attachment for a permanent, rigid mount
• Solid one-piece design minimizes movement and wear

How easy is installation and what tools are required?

These perches are intended for weld-on installation; a qualified welder or experienced DIYer with proper equipment should perform the work. Preparation includes cleaning the axle, positioning the perch for correct spring alignment, and using a steady weld technique to avoid heat damage to axle tubing.

• Requires welding equipment and basic metalprep tools
• Position and tack-weld before final welds to confirm alignment
• Use protective gear and follow axle manufacturer welding guidelines

What components are included and when should I replace them?

This kit contains four identical spring perch seats—enough for one trailer axle—making it suitable for replacing worn perches or upgrading an axle setup. Replace perches if you see distortion, excessive corrosion, misalignment of the springs, or movement between the spring and perch during use.

• Included: 4 spring perch seats (one axle set)
• Inspect for cracks, bending, or severe rust to determine replacement need
• Recommended for medium-duty cargo, flatbed, and small farm trailers

Who is this for: The Lonffery 4-pack trailer axle spring perch seats are aimed at trailer owners, repair shops, and fabricators who need a reliable weld-on perch for 3" round axles. If you maintain medium-duty cargo or flatbed trailers, or perform axle refurbishments on small farm trailers, this kit provides accurate dimensions and heavy-duty steel construction for long-term service when installed by a competent welder.