45mm Round Axle


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45mm Round Axle

45mm round axle suits wider small box trailers and boat trailers up to 1450kg. Couplemate axles are guaranteed for life against faulty workmanship. Bearing wear is determined by the degree of precision machining.

Bearing journals require smooth, accurate surfaces to ensure long bearing life. Additionally, add 100mm to the face to face measurement to get the total length measurement.

Slimline (SL) Bearing Sizes.

  • Inner bearing ID 35.00mm, OD 59.10mm
  • Outer bearing ID 22.00mm, OD 45.20mm
  • Seal ID 43.9mm, OD 59.10mm
  • Dust Cap 45.20mm

Parallel Bearing Sizes.

  • 2 x Inner bearing ID 35.00mm, OD 59.10mm
  • Seal ID 43.9mm, OD 59.10mm
  • Dust Cap 45.20mm

Your 45mm Round Axle may be perfect for your trailer, caravan or camper. If you are towing your rig straight and true, perfect if not then below are a few tips.

45mm Round Axle Common problems:

  • Too much weight will bend this 45mm Round Axle to experience excess axle flex. Axle flex occurs when a heavily laden trailer spring rebound on the highway causing the 45mm round axle to flex up and down, or vibrate in the middle of the axle.
  • Springs fatigue and fail prematurely under axle flex or overload conditions. Once your load is over 1450kg you will start to experience axle flex.
  • Axles and Hollow axles that are incorrectly selected for the job you require.

If your axle is 45mm Round and bending, buy a 45mm square axle and update to 1.5t. It is not very expensive in comparison to replacing springs that have suffered fatigue.

Other Common Problems:

  • If your 45mm axle is not properly engineered, you may experience excessive bearing wear.
  • Are your tandem tyres wearing unevenly? Here is a link that provides an easy method to test your axles.
  • 45mm Axles must be examined before installation for cracks in the steel along the axle. Some suppliers supply non-virgin steel or scrap steel and forge this steel into solid square or round shape for axle production.
  • Chinese bearings are the second biggest cause of axle failure. If you are planning highway driving, use Japanese bearings. The combination of Japanese Bearings and 45mm Axle will help you greatly with lower maintenance for your rig.


  • Axles under say 2000mm and are 6 stud Landcruiser then upgrade to a parallel axle.
  • If your axle is over 2000mm and is 6 stud Landcruiser, then upgrade to a parallel axle.

Axle Steel explained

Caravan axles and their maximum rating.

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

How To Measure An Axle

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 numbers.

Where to identify bearing number. Look for the laser engraved number on the bearing.

Additional information

Weight70 kg
Dimensions240 × 50 × 50 cm
Bearing Profile

Ford Slimline, Parallel

Tip to Tip Length

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


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