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Spring U-Bolt Kits

Showing all 11 results

  • Trailer U bolt Kit | Galvanised

    39mm Round Spring U-Bolt Kits – Galvanised

    UK39R $39.00 - $46.00
    Options This product has multiple variants. The options may be chosen on the product page In stock
  • Trailer U bolt Kit | Galvanised

    45mm Round Spring U-Bolt Kits – Galvanised

    UK45R $42.95 - $51.90
    Options This product has multiple variants. The options may be chosen on the product page In stock
  • 45mm Square Spring U-Bolt Kits – Galvanised

    UK45S $45.00 - $52.93
    Options This product has multiple variants. The options may be chosen on the product page In stock
  • 40mm Square Spring U-Bolt Kits – Galvanised

    UK40S $45.16 - $48.64
    Options This product has multiple variants. The options may be chosen on the product page In stock
  • Trailer U bolt Kit | Galvanised

    1/2-inch Galvanised U-Bolt Kits – Multi Length

    $45.67 - $57.50
    Options This product has multiple variants. The options may be chosen on the product page In stock
  • Trailer U bolt Kit | Galvanised

    50mm Round Spring U-Bolt Kits – Galvanised

    UK50R $49.81 - $53.55
    Options This product has multiple variants. The options may be chosen on the product page In stock
  • 50mm Square Spring U-Bolt Kits – Galvanised

    UK50S $50.00 - $55.50
    Options This product has multiple variants. The options may be chosen on the product page In stock
  • 16mm Heavy Duty ElectroGal u-bolt

    45mm Square x M16 U-Bolt Kit – 150mm Long

    CM601-5/8 $84.25
    Add to cart 41 in stock
  • 16mm Heavy Duty ElectroGal u-bolt

    50mm Square x M16 U-Bolt Kit – 180mm Long

    CM603-5/8 $94.25
    Add to cart 18 in stock
  • 65mm Round x 16mm U-Bolt Kit

    65mm Round x 16mm U-Bolt Kit – 200mm Long

    CM605 $107.50
    Add to cart 124 in stock
  • Couplemate M16 U-Bolt Kit Heavy Duty 60mm Round

    60mm Round x M16 U-Bolt Kit – 190mm Long

    CM604 $117.00
    Add to cart 88 in stock

U-Bolt Kits for Axle and Leaf Spring Suspension

Couplemate™️ Spring U-Bolt Kits suit trailer and caravan spring and beam suspension systems. Filter spring u-bolt kits by length, width, and coating, or browse our complete range.

What’s in the Spring U-Bolt Kit?

Couplemate™️ Spring U-Bolt Kits feature only high-quality, trusted components. In each kit, you will receive:

  • 4 x U-bolts
  • 8 x Nylock nuts
  • 8 x Flat washers
  • 2 x U-bolt plates (fish plates)
  • 2 x Axle pads

What the axle pads used for? These pads are welded to your axle as a security mechanism. Axle pads prevent the steel leaf spring centre pin and steel axle from direct contact. The Couplemate™️ technical hub has a good article that talks more about axle pad importance here.

Customers who buy the Spring U-Bolt Kit for maintenance reasons are unlikely to need these axle pads (they should already be welded). However, they are useful as spares and can be used on new axle beam suspension builds.

Axle pads are also known as spring locators.

How do I know which Spring U-Bolt Kit I need?

Traditionally, Australian trailers and caravans have leaf springs and an axle underneath the chassis. If your trailer or caravan has this, you will need a u-bolt kit.

U-Bolts are listed on our website by the internal measurements. To work out which kit you need, you’ll want to measure your axle width (e.g. 50mm square) and the length you need.

Couplemate™️ U-bolts are available in two types and suit common axle sizes (round or square).

  • 12.7mm (1/2″) Galvanised: For light-duty trailers and caravans (up to 1450kg single axle or 2900kg tandem axle).
  • 16mm (M16) Electro-Plated: For light-duty or medium-duty application (from 1600kg to 4500kg ATMs).

What trailers use these Spring U-Bolt Kits?

Couplemate™️ ensures our components suit a range of trailer and towing applications. In particular, our spring u-bolt kits suit the following:

Boat trailers
Caravans and campers
Horsefloats and animal trailers
Toyhaulers
 General Purpose Trailers