The Couplemate Caravan Reversing Guide (Marriage Saver®) makes hitching up your caravan, boat or camper easier than ever! Reversing cameras are great, but they do not stop accidents as efficiently as this trailer guide.
We support local suppliers and help bring business back to Australian shores. There is strong demand for Australian Made caravan and trailer parts across the market.
The facts are simple; Australian Made goods create employment in Australia.
Traditional trailers, caravans, and campers usually have springs mounted below the axle (often called "overslung" axles). However, some trailers in Australia are supplied with springs on top of the axle by default. For example, if you own a Jayco Off-Road caravan or...
Square Axle U-bolt Fasteners for Caravans, Campers and Boat Trailers
Square axle U-bolt fasteners are rated at 1500kg single axle trailers, although our U-bolts are tested to destruction which occurs at 17,000kg.
The smaller rating allows for several factors, including shock-loading events.
U bolts clamp axles used for trailers, caravans, and campers.
How to measure axle U-Bolts
Significantly, to prevent clamp failure, tighten u-bolts after 300 kilometres.
Gal square U Bolts are manufactured from mild steel and stretch after the initial tightening.
Once the fishplate begins to bend during tightening, the u-bolts are tight.
Finally, expect to gain 1/4 or 1/2 a turn when retightening after 300 kilometres.
Why U-bolts may be the Major Cause of Accidents.
Stretching U-Bolts cause Caravanning Problems.
Couplemate U-Bolts
A
Round U-Bolts
A
Square U-Bolts
B
Width
C
Height
Part Number
1 ½ inch (39mm)
½ inch (12.7mm)
4 inch (100mm)
U39R4GH
1 ½ inch (39mm)
½ inch (12.7mm)
4½ inch (112mm)
U39R45GH
1 ½ inch (39mm)
½ inch (12.7mm)
5 inch (125mm)
U39R5GH
1 ½ inch (39mm)
½ inch (12.7mm)
5½ inch (137mm)
U39R55GH
1 ¾ inch (45mm)
½ inch (12.7mm)
4 inch (100mm)
U45R4GH
1 ¾ inch (45mm)
½ inch (12.7mm)
4½ inch (112mm)
U45R45GH
1 ¾ inch (45mm)
½ inch (12.7mm)
5 inch (125mm)
U45R5GH
1 ¾ inch (45mm)
½ inch (12.7mm)
5½ inch (137mm)
U45R55GH
1 ¾ inch (45mm)
½ inch (12.7mm)
6 inch (150mm)
U45R6GH
1 ¾ inch (45mm)
½ inch (12.7mm)
6½ inch(162mm)
U45R65GH
2 inch (50mm)
½ inch (12.7mm)
4 inch (100mm)
U50R4GH
2 inch (50mm)
½ inch (12.7mm)
4½ inch (112mm)
U50R45GH
2 inch (50mm)
½ inch (12.7mm)
5 inch (125mm)
U50R5GH
2 inch (50mm)
½ inch (12.7mm)
5½ inch (137mm)
U50R55GH
2 inch (50mm)
½ inch (12.7mm)
6 inch (150mm)
U50R6GH
2 inch (50mm)
½ inch (12.7mm)
6½ inch(162mm)
U50R65GH
2 inch (50mm)
½ inch (12.7mm)
7 inch (175mm)
U50R7GH
1 ½ inch (40mm)
½ inch (12.7mm)
4 inch (100mm)
U40S4GH
1 ½ inch (40mm)
½ inch (12.7mm)
4½ inch (112mm)
U40S45GH
1 ½ inch (40mm)
½ inch (12.7mm)
5 inch (125mm)
U40S5GH
1 ½ inch (40mm)
½ inch (12.7mm)
5½ inch (137mm)
U40S55GH
1 ½ inch (40mm)
½ inch (12.7mm)
6 inch (150mm)
U40S6GH
1 ¾ inch (45mm)
½ inch (12.7mm)
4 inch (100mm)
U45S4GH
1 ¾ inch (45mm)
½ inch (12.7mm)
4½ inch (112mm)
U45S45GH
1 ¾ inch (45mm)
½ inch (12.7mm)
5 inch (125mm)
U45S5GH
1 ¾ inch (45mm)
½ inch (12.7mm)
5½ inch (137mm)
U45S55GH
1 ¾ inch (45mm)
½ inch (12.7mm)
6 inch (150mm)
U45S6GH
1 ¾ inch (45mm)
½ inch (12.7mm)
6½ inch(165mm)
U45S65GH
1 ¾ inch (45mm)
½ inch (12.7mm)
7 inch (175mm)
U45S7GH
2 inch (50mm)
½ inch (12.7mm)
3 inch (75mm)
U50S3GH
2 inch (50mm)
½ inch (12.7mm)
4 inch (100mm)
U50S4GH
2 inch (50mm)
½ inch (12.7mm)
4½ inch (112mm)
U50S45GH
2 inch (50mm)
½ inch (12.7mm)
5 inch (125mm)
U50S5GH
2 inch (50mm)
½ inch (12.7mm)
5½ inch (137mm)
U50S55GH
2 inch (50mm)
½ inch (12.7mm)
6 inch (150mm)
U50S6GH
2 inch (50mm)
½ inch (12.7mm)
6½ inch (165mm)
U50S65GH
2 inch (50mm)
½ inch (12.7mm)
7 inch (175mm)
U50S7GH
2 inch (50mm)
½ inch (12.7mm)
8 inch (200mm)
U50S8GH
2 inch (50mm)
½ inch (12.7mm)
10 inch (250mm)
U50S10GH
2 ¼ inch (56mm)
½ inch (12.7mm)
4½ inch (112mm)
U56S45GH
2 ¼ inch (56mm)
½ inch (12.7mm)
5 inch (125mm)
U56S5GH
2 ¼ inch (56mm)
½ inch (12.7mm)
5½ inch (137mm)
U56S55GH
2 ¼ inch (56mm)
½ inch (12.7mm)
6½ inch (165mm)
U56S65GH
3 inch (75mm)
½ inch (12.7mm)
3 inch (75mm)
U75S75GH
3 inch (75mm)
½ inch (12.7mm)
4 inch (100mm)
U75S100GH
3 inch (75mm)
½ inch (12.7mm)
5 inch (125mm)
U75S125GH
3 inch (75mm)
½ inch (12.7mm)
6 inch (150mm)
U75S150GH
3 inch (75mm)
½ inch (12.7mm)
7 inch (175mm)
U75S175GH
3 ¼ inch (82mm)
½ inch (12.7mm)
4 ¾ inch (120mm)
U80S120GH
4 inch (100mm)
½ inch (12.7mm)
3 inch (75mm)
U100S75GH
4 inch (100mm)
½ inch (12.7mm)
4 inch (100mm)
U100S100GH
4 inch (100mm)
½ inch (12.7mm)
5 inch (125mm)
U100S125GH
4 inch (100mm)
½ inch (12.7mm)
8 inch (200mm)
U100S200GH
1 ¾ inch (45mm)
⅝ inch (16mm)
6 inch (150mm)
CM600GH
2 inch (50mm)
⅝ inch (16mm)
6 inch (150mm)
CM602GH
2 ⅓ inch (60mm)
⅝ inch (16mm)
7 inch (175mm)
CM604GH
1 ¾ inch (45mm)
⅝ inch (16mm)
6 inch (150mm)
CM601GH
2 inch (50mm)
⅝ inch (16mm)
7 inch (175mm)
CM603-7GH
The facts are simple; Australian Made goods create employment in Australia.
Traditional trailers, caravans, and campers usually have springs mounted below the axle (often called "overslung" axles). However, some trailers in Australia are supplied with springs on top of the axle by default. For example, if you own a Jayco Off-Road caravan or...
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