How To Id Trailer Axles

admin 23.08.2019

The Diagrams below show the Typical Trailer Wiring for 4 Pin Flat Connectors all the way to 7 Pin Round Connectors. It is Important to note that the “White Wire” is the ground wire, You will notice this even when you buy lights. A lot of LED Lights come with Black and White wires and people can easily confuse the black wire for the ground. A faulty and unsecured ground wire is often the. SPRING CENTER: For replacement axle, to determine the spring center, measure from the center of one spring to the center of the opposite spring. For new axles, determine the outside to outside width of the trailer frame and subtract 2-inches to obtain your spring centers.

How To Determine Trailer Axle Position

In order to replace a hub on your trailer, you will need to know the bolt pattern or lug pattern. Trailer wheel hub patterns can be defined by the number of bolts or lugs per wheel and the diameter of the circle that the bolts are arranged on. Determining the bolt pattern is rather easy, but it is very important that accurate measurements are taken. The majority of boat trailers on the road have a 4, 5 or 6 lug pattern. A very common designation for boat trailer hubs would be 5 on 4-1/2 or 545 for short. Dark pirate king blade and soul. This means that the hub has 5 bolts spaced evenly on a 4-1/2' circle (see 5-lug diagram).

Determining the bolt pattern on your trailer:

You will need to first count the number of lug bolts on one wheel. Most trailer hubs typically have 4 or 5 lugs per wheel/hub. Heavier duty, higher capacity trailers generally have 6 or 8 Lugs per wheel.
If the trailer hubs have an even number of bolts holding the wheel, measure from the center of one bolt to the center of the bolt directly opposite using a ruler, tape measure or caliper. The hub lug bolt pattern will be determined by the number of lug bolts and the distance between the opposing hub bolt (see 4-lug hub diagram). All but 5-lug patterns are measured in this manner.
If your trailer wheel hubs have 5 lug bolts, measuring is slightly different. Choose any lug bolt and measure the distance between the back of one lug to the center of another that is directly across from it. Be sure that you skip one bolt when measuring. You can measure the distance in either direction

How To Determine Trailer Axle Position

The two most common lug patterns are 4 on 4' and 5 on 4-1/2' hubs. These hubs are typically seen on smaller boat and utility trailers.

NOTE: If you are replacing older wheel hubs, wheels, integrated hub/drums or hub/rotors the bearings should be checked for wear and replaced as necessary. Always use a high-temperature wheel bearing grease when re-packing your trailers hubs.

4, 6 and 8 Lug trailer wheel hubs are all measured in the same manner.

If you need to replace your hubs, please see our current selection of boat trailer hubs. We also have a full selection of grease & oil and bearings & seals for all your needs.