39mm Round Axle suits Standard Bearings made in Australia.
Couplemates 39mm Round Axle suits small box and boat trailers.
We use LM or standard bearings with a rating of 750kg.
How to measure your straight axle correctly.
Standard or LM Bearing Sizes are;
- Inner ID 31.75mm, OD 59.10mm
- Outer ID 19.05mm, OD 45.20mm
- Seal ID 37.5mm, OD 59.10mm
- Dust Cap 45.20mm
Couplemate manufactures 39mm round 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. The 39mm Round Axle is 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.
- 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.
- Springs will fatigue & fail prematurely under axle flex or overloaded conditions.
- If the load is over 750kg, axle flex will occur.
- If the axle is 39mm Round and bending, buy a 45mm round axle and update to 1.5t.
- Upgrading your axle 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? Here is a link that provides the correct method to test your axles.
- 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 plan driving on the highway, use Japanese bearings. The combination of Japanese Bearings and Couplemate axles will help you significantly lower maintenance for your rig.
Couplemate has expert CNC technicians and precision equipment to manufacture quality axles.
Let’s run through the process from the video below.
- We first cut a solid beam to the correct length.
- Couplemate developed a program to use a roughing tool, a finishing tool, and a threading tool.
- The first tool used in the video is a roughing tool. This tool removes most of the steel before we arrive at the finishing profile.
- The finishing tool skims over the profile and produces a journal within 0.02mm.
- Once the finishing tool has done its job, a threading tool is engaged, which also cut a thread within 0.02mm of its specification.
- The CNC technician then manually fits front and back bearings to ensure a tight fit. The axle nut is installed and tested for tightness.
- Finally, if all the steps above pass, then the axle is removed from the lathe.