40mm Square Axle
$135.00 – $190.50
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40mm Square Axles to suit Standard Bearings
40mm square axle suits wider small box trailers and boat trailers up to 1000kg.
Axles are measured from the tip of the axle to the tip of the axle. When measuring from the face of the axle, add 100mm to this measurement to get the tip of the thread to the tip of the thread length.
Standard Bearing Sizes
Couplemate manufactures 40mm square trailer axles in Wynnum, Queensland. BlueScope or One Steel provides the best axle money can buy. If you can find a better product, please tell me.
For more information about why we use quality steel, check out my article, Axle Steel for Caravan and Trailer Axles.
Your 40mm square axle may be perfect for your trailer, caravan, or camper if you are towing your rig straight and true. If not, below are a few tips.
Common problems:
- Too much weight will bend this 39mm Round Axle, causing axle flex.
- An overloaded axle causes axle flex. You can read about axle flex and vibration here.
- Axle flex occurs when heavily loaded trailer springs rebound on the highway, causing the axle to flex up and down in the middle of the axle.
- Springs to fatigue – fail prematurely under axle flex loading conditions.
- If your load is over 1000kg, you will experience axle flex.
- If your axle is 40mm Square and bending, buy a 45mm square axle and update to 1.5t.
- It is not expensive in comparison to replacing springs that have suffered fatigue.
- Rough seal journals can cause a loss of grease through the rear seal.
- Are your tandem tyres wearing unevenly? How to Align Caravan Wheels
- Some suppliers supply non-virgin or scrap steel and forge this steel into a solid square or round shape for axle production.
- Chinese bearings are the second most significant cause of axle failure. If you plan to drive on the highway, use Japanese bearings. Combining Japanese Bearings and a 39mm round Axle will significantly help you with lower rig maintenance.
Finally, after reading the above information on axles, I invite you to comment in the review box below. We never get too old to learn.
Calculating The Correct Axle Measurements
- Measure the offset wheel. The wheel offset is the distance between the hub’s inside and the rubber’s outside.
- Add 50 mm to the offset. Alternatively, choose the distance between the rubber and the chassis.
- 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.
Caravan axles and their maximum rating.
- 39mm Round Axle
- 39mm Round Galvanised Axle – 750kg
- 40mm Square Galvanised Axle – 1000kg
- Round Axle 45mm – 1600kg
- 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
Additional information
| Weight | 40 kg |
|---|---|
| Dimensions | 230 × 40 × 40 cm |
| Tip to Tip Length | 1475mm – 58-inch, 1500mm – 59-inch, 1525mm – 60-inch, 1550mm – 61-inch, 1575mm – 62-inch, 1600mm – 63-inch, 1625mm – 64-inch, 1650mm – 65-inch, 1675mm – 66-inch, 1700mm – 67-inch, 1725mm – 68-inch, 1750mm – 69-inch, 1775mm – 70-inch, 1800mm – 71-inch, 1825mm – 72-inch, 1850mm – 73-inch, 1875mm – 74-inch, 1900mm – 75-inch, 1925mm – 76-inch, 1950mm – 77-inch, 1975mm – 78-inch, 2000mm – 79-inch, 2025mm – 80-inch, 2050mm – 81-inch, 2075mm – 82-inch, 2100mm – 83-inch, 2125mm – 84-inch, 2150mm – 85-inch, 2175mm – 86-inch, 2200mm – 87-inch, 2225mm – 88-inch, 2250mm – 89-inch, 2275mm – 90-inch, 2300mm – 91-inch, 2325mm – 92-inch, 2350mm – 93-inch, 2375mm – 94-inch, 2400mm – 95-inch, 2425mm – 96-inch, 2450mm – 97-inch, 2475mm – 98-inch |
| Beam Size |
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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