40mm Round Spring Mounting Kit (44.5mm Spring Width)

The 40mm Round Spring Mounting Kit is a complete, single-side suspension hardware installation package engineered to secure 44.5 mm wide semi-elliptical leaf springs to 40 mm round solid or tubular trailer axles. Designed for light-to-medium utility trailers, luggage trailers, camping trailers, and lightweight caravans, this kit provides all essential structural brackets and fastening components required to mount one leaf spring assembly securely to the trailer chassis and axle beam.

Manufactured from heavy-gauge, weldable structural steel and high-tensile threaded fasteners, the assembly ensures positive axle alignment, prevents axle tube rotation under braking torque, and distributes dynamic road loads evenly across the chassis. The kit incorporates a matched 5-hole U-bolt clamping plate and an axle locating saddle that seats over the 40 mm round axle beam, accompanied by a weld-on front eye hanger bracket and a rear slipper bracket to facilitate free spring articulation under compression.

Key Features & Benefits:

• Matched 40mm Round Axle Seating: Features a dedicated 40 mm round axle saddle that contours to round axle beams, preventing axle roll, lateral slipping, and U-bolt distortion under braking or acceleration.

• Engineered for 44.5mm Wide Leaf Springs: Brackets, spring saddle, and U-bolt spacing are sized for standard 44.5 mm (1-3/4") spring blades, eliminating side-play and binding.

• Heavy-Duty 5-Hole Clamping Plate: High-strength plate provides rigid clamping across the spring center-bolt, ensuring even torque distribution across both U-bolts.

• Full Chassis & Axle Attachment Hardware: Combines chassis-mounting brackets (front hanger and rear slipper) and axle-tie hardware (saddle, U-bolts, plate, nuts) into a single matched assembly.

• Weldable Structural Steel Brackets: Uncoated steel hanger and slipper brackets allow direct welding to trailer chassis main rails or subframes.

• High-Tensile Fasteners: Precision-threaded U-bolts and deep hex nuts maintain clamping preload against vibration and cyclical road shock.

Kit Contents (Per Spring Assembly):

• 1x U-Bolt Clamping Plate: 5-hole heavy-gauge top/bottom clamping plate

• 2x U-Bolts with Hex Nuts: High-tensile round-bend U-bolts sized for 40 mm round axles

• 1x Front Hanger Bracket: Weld-on forward eye mounting bracket

• 1x Rear Slipper Bracket: Weld-on rear slipper channel bracket

• 1x Axle Saddle: 40 mm contoured round axle locating seat

Ideal Applications:

• Light Utility & Box Trailers: Single- or tandem-axle utility trailers utilizing 40 mm round axle beams.

• Camping & Luggage Trailers: Lightweight touring and luggage trailers fitted with 44.5 mm slipper leaf springs.

• Small Boat & Watercraft Trailers: Marine trailers built with round axle tubing requiring reliable leaf spring mounting running gear.

• Trailer Repairs & Axle Conversions: Complete replacement hardware kit for retrofitting or rebuilding worn spring hangers and U-bolts.

Product Specifications:

• Product Name: 40mm Round Spring Mounting Kit

• Product Category: Suspension / Spring Mounting Kits

• Supported Axle Profile: 40 mm Round (Solid or Tubular Beam)

• Supported Spring Width: 44.5 mm (1-3/4") Wide Leaf Springs

• Configuration: Single Spring Corner Kit (1 Side)

• Chassis Attachment: Weld-on Hanger and Slipper Brackets

• Material: Heavy-Gauge Structural Steel Plate and High-Tensile Fasteners

• Application Compatibility: Utility Trailers, Caravans, Luggage Campers, Boat Trailers

• Condition: Brand New Commercial Vehicle Hardware