45mm Round Spring U-Bolt Kits – Galvanised

45mm Round Spring U-Bolt Kits | Hot-Dip Galvanised

The Couplemate™ 45mm u-bolt kit for round axles includes Galvanised u-bolts, nylock nuts, and fish plates.

Spring U-Bolt Kits are designed to safely secure leaf springs to trailer and caravan axles. U-bolts are link between your trailer and the road, hence the importance of using u-bolts made from high-quality materials. 

This U-Bolt Kit is supplied with:

• 4 x U-Bolts (choose preferred length)
• 8 x Washers
• 8 x Nyloc nuts
• 2 x Fish Plates
• 2 x Axle Pads/Spacers

45mm Round U-Bolt Specifications

U-Bolts are measured on their internal dimensions to ensure proper fit and alignment with the equipment. See our technical diagram for a visual reference.

• Internal U-Bolt Width: 45mm
• Internal U-Bolt Leg Length:
  • 100mm (4″)
  • 115mm (4.5″)
  • 125mm (5″)
  • 140mm (5.5″)
  • 150mm (6″)
  • 165mm (6.5″)
  • 175mm (7″)
• Thread: 1/2″ UNF (12.7mm)
• Coating: Traditional hot-dipped galvanised

Couplemate™️ supplies these 45mm round u-bolt kits for leaf spring suspension systems.

Installation (User Guide)

Couplemate™️ 45mm Round U-Bolt Kits are easy for trailer spring maintenance.

• Place U-shaped curve over axle beam.
• Align the centre spring bolt and U-bolt legs with the fish plate holes.
• Secure fish plate to leaf spring through supplied washers and nylock nuts. Tighten nuts to 60Nm with a socket.

Important: Check U-bolts and re-tighten nuts after the first trip and every 250 km thereafter.

Safety Precautions

• Do not re-use nyloc nuts. Nyloc nuts are often less effective after the first use. This is because the nylon material (the key component of a nyloc nut) has already once conformed to the thread profile. 
• Do not use a rattle gun to tighten. Rattle guns often tighten u-bolts too fast, too tight, and uneven. This can cause nylon overheat and risks undue wear. 
• Ensure the axle has welded axle pads. If not, use the axle pads supplied with the spring U-bolt kit.

Available U Bolt Kits

• 39mm Round Spring U-Bolt Kits – Galvanised
• 40mm Square Spring U-Bolt Kits – Galvanised
• 45mm Round Spring U-Bolt Kits – Galvanised
• 45mm Square Spring U-Bolt Kits – Galvanised
• 50mm Round Spring U-Bolt Kits – Galvanised
• 50mm Square Spring U-Bolt Kits – Galvanised