45mm Round Axle

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 a long bearing life. To get the total length, add 100mm to the face-to-face 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 rebounds 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 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 it to 1.5t. It is not very expensive compared to replacing fatigued springs.

Other Common Problems:

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

Solutions

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

Axle Steel explained

Caravan axles and their maximum rating.

• 39mm Round Axle – 750kg
• 39mm Round Galvanised Axle – 750kg
• 40mm Square Axle – 1000kg
• 40mm Square Galvanised Axle – 1000kg
• 45mm Round Galvanised Axle – 1600kg
• Square Axle 45mm – 1450kg
• 45mm Square Parallel Axle – 1600kg
• 45mm Galvanised Square Axle – 1600kg
• 50mm Square Axle – 2500KG
• 50mm Galvanised Square Axle – 2250kg
• 60mm Round Trailer Axle 2t or 3t
• 60mm Round Axle – 3000kg
• 60mm Galvanised Round Axle – 3000kg

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 your 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 numbers.