50mm Square Slimline Axle – Bare


SKU: 50S Category:
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50mm Square Axle Caravan Trailer Boat

50mm square axle is the axle of choice to tow your rig straight and true. Vibration fatigue is never going to happen on this axle loaded to 2.25t.

Couplemate manufacturers axles from BlueScope steel in our Wynnum, Brisbane workshops.

50mm Square Solid Axle rating

  • Holden Bearing Profile – 1,000kg Max
  • Ford Bearing Profile – 1,450kg Max
  • Dexter Bearing Profile – 1,590kg Max
  • Ford Parallel Bearing Profile – 1,600kg Max
  • Al-ko Bearing Profile – 2,250kg Max
  • Dexter Bearing Profile – 2,250kg Max
  • Al-ko Bearing Profile – 3,000kg Max

Note: Please advise your axle length, either tip to tip length or face to face measurement and axle profile after ordering. Example 2t, 3t, parallel, slimline.

So where does this steel come from?

Newcastle in New South Wales continues its rolling bar mill that pulls its feedstock from Whyalla in South Australia.

The other major arm of the Newcastle steel industry is Commonwealth Steel at Waratah, NSW. This wire works mill pulls its steel from 1000 car bodies per day.

Australian Steel is a fascinating story. Such a pity the Television media reporting on Australian success stories is not better supported.

Calculating The Correct Axle Measurements

  1. Measure the offset wheel. The wheel offset is the distance between the inside of the hub and the outside of the rubber.
  2. Add 50 mm to the offset. Alternatively, choose your own distance between the rubber and the chassis.
  3. Multiply by 2 for both sides. Add your chassis width to the above number.

Metric to Imperial Converter

Convert Imperial (inches) to metric (mm)

  • =

Still unsure of what measurements to take? Check out this handy guide below:

[P] – Check material specifications. What size and profile is the axle (for example, 45mm Square)
[T] – Overall axle length (tip to tip)
[F] – Hub face to hub face measurement
[A] – Chassis width
[C] – Tyre clearance
[B] – Back offset
[H] – Tyre to chassis
[G] – Axle pad centres

Identifying Bearing Combinations

You will also need to identify your bearing combination which can be done by pulling off a hub and bearings, and locating the number laser engraved onto the bearing. You will require both the inner and the outer bearing number.

How to calculate total axle length

The Face to Face measurements to calculate Tip to Tip measurement is as follows: –

Solid Axles rarely cause problems.

50mm square parallel axle can vary greatly in price. Axles are manufactured in a variety of places, India, China, Malaysia, Australia.

The only real problems come from imported steel causing steel fractures along the beam and in the consistent hardness of the beam.

Other Common Problems and Tips:

If your 50mm square parallel trailer, caravan axle is not properly engineered you may experience excessive bearing wear.

  1. Rough seal journals can cause a loss of grease through the rear seal.
  2. Some suppliers supply non-virgin steel or scrap steel and forge this steel into a solid square or round shape for axle production. Always ask for Australian Steel.
  3. Chinese bearings are the second biggest cause of axle failure.
  4. If you plan to get onto a highway, use Japanese bearings.
  5. The combination of Japanese Bearings and 50mm Square Axle will help you greatly with lower maintenance for your rig.
  6. Are your tandem tyres wearing unevenly? How to Align Caravan Wheels
  7. Axle Steel explained.


We rarely have problems with these larger kits.

A Couplemate assembled axle with Japanese bearings gives you our unconditional guarantee of a well-made, well-backed axle assembly.

Caravan upgrades are explained here.

More axles and their maximum rating can be found here.

Other 50mm Square Axles

Finally, a lightweight solution to a heavy-duty square axle is a hollow axle.

50mm Square Axle Caravan Trailer Boat

Additional information

Weight60 kg
Dimensions230 × 30 × 30 cm

1475mm T/T, 1500mm T/T, 1525mm T/T, 1550mm T/T, 1575mm T/T, 1600mm T/T, 1625mm T/T, 1650mm T/T, 1675mm T/T, 1700mm T/T, 1725mm T/T, 1750mm T/T, 1775mm T/T, 1800mm T/T, 1825mm T/T, 1850mm T/T, 1875mm T/T, 1900mm T/T, 1925mm T/T, 1950mm T/T, 1975mm T/T, 2000mm T/T, 2025mm T/T, 2050mm T/T, 2075mm T/T, 2100mm T/T, 2125mm T/T, 2150mm T/T, 2175mm T/T, 2200mm T/T, 2225mm T/T, 2250mm T/T, 2275mm T/T, 2300mm T/T, 2325mm T/T, 2350mm T/T, 2375mm T/T, 2400mm T/T, 2425mm T/T, 2450mm T/T, 2475mm T/T


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