How To Measure Trailer Axle Hub


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Also, keep in mind that when replacing your trailers axle, this would be the time to get a fresh and new galvanized trailer hub or trailer bearing kit to have a fresh hub or set of bearings to mount to your new trailer axle. (the face is where the wheel sits against the hub.) the measurement from the center of one spring pad to center of the other.

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Bearings have the number stamped into them or you can measure them with verniers.

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How to measure trailer axle hub. Torsion style trailer axles handle the drop a little different. The diagram below illustrates how to do this on 4, 5 and 6 stud hubs. Many trailer axles are cambered or 'road set' so there is a bow until weight is put on the axle.

Identify the number and size of studs on your hub, measure the pcd (pitch circle diameter). Stretch the measuring tape across to the hub face on the other end. Measure from the face of the hub where the wheel bolts on, to the face on the other end of the axle where the wheel bolts on.

Trailer axles can be supplied fully assembled, fitted with hubs or fitted with brakes. When replacing a trailer axle try to determine how it was previously mounted. How to measure a trailer axle.

To determine your trailer’s track width, measure from the center of one tire to the center of the opposite tire on the other end of the same axle. Even with a bent trailer axle you usually can still get the correct measurements. Then measure from the center of the hub to the center of one bolt and multiply that number by two.

Measure from the center of 1 leaf spring to the outside of the nearest hub. Hub face to hub face can also be called the axle track or the center line of the tire to. • place the tip of a measuring tape on the hub face on one side of the trailer axle.

This would cause uneven tire wear. Most 4 lug hubs have a 4” bolt circle and most 5 lug boat trailer hubs have a 4 ½” bolt circle diameter. Either place the towing vehicle in park if the trailer is attached to it, or place wood blocks on the front and rear of one set of tires to hold the trailer in place.

If its a new trailer A more precise measurement can be obtained by measuring the • park the trailer on a level surface.

Hold the end of a tape measure in the middle of the spring on the good side of the axle. Read our article on bearing identification for details. (generally adding 2” to the spring center measurement can determine the frame width.) also check out the common axles.

This means that the hub has 5 bolts spaced evenly on a 4.5″ circle. Most trailer axles are measure by the hubface and spring center. This measurement is taken from the face of one hub to the face of the other hub where the rim touches the hub.

Hub face (axle track) refers to measuring from the outside face of one hub to the outside face of the opposing hub across the axle. To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. Pull out the tape measure to the outside face of the good hub and write down the measurement.

The correct fitted brake set to suit your specific trailer application & load carrying capacity, can be supplied by mullins in either electric, mechanical, or hydraulic type brake kits. Then contact us on 07 3205 8846 with information on hub type, bearing type and the face to face measurement. Identify inner and outer bearing.

All cambered axles should be mounted with the center bow up. To determine your bolt pattern, first count the number of bolts per hub. The measurement from the face of one hub to the face of the other.

If you determine that the axle is indeed bent, you'll need the following information to get the correct replacement axle. Measure hub face to hub face only. Our axles are listed based of the axles hubface measurement, once this has been determined it is much easier to search for the adequate sized axle.

The hub face is also known as the mounting surface where the wheel studs are located. Under slung mounts have the spring mounted below the axle and over slung mounts have the spring mounted on top. We need your axle track measurement.

A drop axle just allows the trailer to sit lower, usually 4″ for a leaf spring style. Refer to axle measuring video for assistance. Cargo and utility trailers with 5 lug hubs are commonly found with a 5” bolt circle.

A very common designation for boat trailer hubs would be 5 on 4.5 or 545 for short. Do not measure from the back of the hub or brake flange as this will provide an incorrect track measurement. This is built in at the factory, but you can specify the desired angle when buying a torsion axle.

3.the only other measurement needed is the spring center. To correctly measure the bolt circle of a hub, measure from the center of the hub to the center of a stud and multiple that measurement by two.

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