50mm Square Parallel Axle – Bare

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$210.00 - $394.44

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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 will never 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. For example, 2t, 3t, parallel, slimline.

So, where does this steel come from?

Newcastle, in New South Wales, continues its rolling bar mill, which pulls its feedstock from Whyalla, 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. It is a pity the Television media’s 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 hub’s inside and the rubber’s outside.
  2. Add 50 mm to the offset. Alternatively, choose the distance between the rubber and the chassis.
  3. Multiply by 2 for both sides. Add your chassis width to the above number.
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.

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

The only real problems come from imported steel, which causes steel fractures along the beam and consistent hardness.

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 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 most significant cause of axle failure.
  4. If you plan to get onto a highway, use Japanese bearings.
  5. Combining Japanese Bearings and 50mm Square Axle will significantly help you with lower rig maintenance.
  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 comes with 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

Axle Profile

Our Service Lifetime Warranty

Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.

Couplemate™ is a manufacturer and vendor of high-quality towing, trailer, and caravan components. Couplemate™ Core Goods and Custom Work are guaranteed to be free of defects for the service lifetime of the product when used as intended.

Warranties are non-transferrable and Couplemate™ requires satisfactory proof of purchase prior to issuing a remedy. The full Couplemate™ Warranty Policy can be found in the Terms & Conditions: Section 8 – Consumer Guarantees & Warranty.

Warranties are in addition to your rights under the Australian Consumer Law. If something is wrong with your order, please contact our team.

60-Day Returns

After 60 years of experience, we know that life has its unpredictable moments.

All Couplemate™ orders (online, over the phone, or in-store) have a 60 day period for change-of-mind returns and exchanges. There are some items that can’t be returned and some returns may incur a 15% restocking fee.

You can view our full policy for change-of-mind returns here.


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