Couplemate Trailer Parts
Couplemate Trailer Parts

U Bolt | Kits

U Bolt Galvanised Kits and Clamp Kits

U bolts (galvanised) provides a higher degree of strength; they include galvanised nylock nuts that are less prone to breakage than their conventional counterparts.

Why U-bolts may be the Major Cause of Accidents

Some Further Info On Our U-Bolt Kits

All Couplemate Galvanised U-bolt is de-stressed in an additional process—that happens after galvanising—to remove the stresses from manufacture. These U-bolts are then batch tested to destruction.

ubolt test rigWhy are your U bolts tested, you ask?

The answer is that weak points are created when steel is bent. If this pressure is not removed, shock loading from bad roads can cause stress fractures and breakages.

The humble U-bolt on your caravan can cause you unbelievable grief. At Couplemate, we decided a long time ago to manufacture our own U-bolts when reputable products kept breaking.

A standard zinc square U-bolt broke due to a stress fracture on the bend. Immediately, we realised that Couplemate needed to make a better Caravan U bolt.

We designed a U bolt that had the thread rolled—as opposed to cut. Then, we made the length of the thread 60mm—instead of the standard 50mm—because we were always running out of thread when tightening the nuts.

Finally, we decided that galvanised nylock nuts were the better way to lock U bolts into position, rather than the two locking nuts which always seemed to rust.

Note: When replacing U bolts, make sure you also replace your old nylock nuts. These are a one-use-only nut.

Here are a few related u bolt articles

1/2 inch U-bolts: breaking capacity is 17,000kg—we recommend use on axles rated up to 1500kg

5/8 inch U-bolts: breaking capacity is 23,000kg—we recommend use on axles rated up to 2500kg

U bolt Clamp kits are also available for 50mm, 56mm and 80mm clamping.

Couplemate sells only the best quality trailer and caravan spares throughout Australia—covering the Northern Territory, Western Australia, South Australia, Victoria, New South Wales, and Queensland. We also ship products via Australia Post Air to New Zealand.