What Does BTR and BT8 Mean when Picking Out Replacement Trailer Hub

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Question:

Im looking at a couple of the 1inch axle 4 on 4 trailer hubs and I would like to know what BTR and BT8 means and what the difference is.

asked by: Vic M

1

Helpful Expert Reply:

BTR and BT8 are the reference numbers for a standard trailer spindle size. When picking out a hub for a trailer you have to make sure that the hub is designed to fit the spindle. What you will need to do is measure spindles on your trailer where the bearings ride and with the info we will be able to tell what hubs will fit.

If the spindles are .99 inch and .99 inch where the bearings ride you have a BT8 spindle and would need # AKIHUB-440-2-1K.

If the spindles are 1.06 and 1.06 inch where the bearings ride you have a BTR and would need # AKIHUB-440-2-2K.

expert reply by: Jameson C

1

Cactus

7/25/2020

Hi there, I'm looking to find a hub for a 1" spindle, but the length of the spindle where the bearings ride is only 3". Can you help? The trailer is about 50-60 years old.

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Chris R.

7/30/2020

This sounds like a short spindle that is sometimes used on boat trailers that require their own, unique hub assemblies. Are there any numbers stamped inside the existing bearings? Is the trailer manufacturer still around?

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Cactus

7/30/2020

@ChrisR Thanks for the response Chris. Yes it’s an old trailer originally sold with a 12’ sea king “ alum boat ( my grandfathers) I believe these were marketed by Montgomery ward at the time. Original hubs and bearings unfortunately are long gone. I’ve got new 30 year old spindles hubs and bearings, but was trying to avoid the welding to install the spindles. If I could find replacement hubs I could use the bearings, races that I’ve got and existing axle.

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Cactus

8/5/2020

@ChrisR After a little more digging, I'm pretty sure this is a 1958 or 1959 Mastercraft "Modernline" trailer. There were 3 different models, this one I suspect is a MOD 300, the smallest of the lot.

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See All (4) Replies to Cactus ∨

Answer 1

A BT8 spindle would have a diameter of .99 of an inch where the bearings would both install and would have a diameter of 1.24 where the great seal would ride. That would require a hub part #AKIHUB-440-2-1K for an idler hub. A BTR spindle would have…

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Answer 2

The BTR and BT8 denotations refer to the spindle, not the trailer hub. The difference between a BTR and BT8 spindle is that the BTR spindle uses a 1.063" diameter L44649 bearing and the BT8 spindle uses a 0.99" diameter L44643…

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Answer 3

The #A5TRSSB ring will not work with the GloLight LED Trailer Tail Light #STL101RCFB. The GloLight LED Trailer Tail Light #STL101RCFB already has a built-in ring which prevents you from using the stainless steel ring. What you would need to do is…

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Answer 4

We offer the correct replacement for you. If you have EZ-Lube spindles, use #8-259-5UC1-EZ or #8-259-5UC1 for standard spindles. The hub includes the L44649 inner and outer bearings, the L44610 inner and outer race, the 10-9 grease seal, the dust cap…

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Answer 5

We can't do anything with that axle tag, and don't have any way of knowing off-hand or cross-referencing what 2,000 lb hub you need. In order to find the correct hubs you will need to take apart your current hub assembly and look at the…

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Answer 6

In order to pick out the correct hub assembly for a trailer you are going to need know a few key pieces of information. The first thing you will need to know is the bolt pattern of your hubs. This is so you get a hub that is compatible with your…

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Answer 7

It looks like the inner bearing you measured at 1.369" and the outer bearing at 1.059" and if that's the case you likely have a 3,500 lb axle as the inner is probably L68149 (1.378") and the outer is probably L44649 (1.063").…

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Answer 8

I did some research and found that the 12194TC seal you said you have measures 1.250 inside diameter, and 1.979 outside diameter. The seal I recommend is part #34823. The dimensions listed for this seal are 1.249 inside diameter and 1.983 outside…

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Answer 9

You will need to disassemble your hub to get the actual bearing numbers. Unfortunately the numbers you gave me don't help identify anything. Check out the video I attached that details how to get the bearings out of a hub so that they can be…

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Answer 10

Yes, the Trailer Idler Hub Assembly for 2,000-lb E-Z Lube Axles part #AKIHUB-545-2-G-EZ-2K is a direct fit for the BTR EZ Lube Spindle part #TRU44FR. For future references, in order to ensure an exact fit, you will need to find the part number on the…

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Answer 11

The #AKIHUB-440-2-G-1K uses a 1/2 inch wheel stud. 90-95 ft lbs of torque is probably about right for the lug nuts. If you check out the lug nut torque chart that I attached you will see that nearly all the torque specs are that and higher. The wheel…

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Answer 12

A non-tapered spindle with a 1.00" diameter will use an #L44643 inner and outer bearing, so you'll want to use the Trailer Idler Hub Assembly for 2,000-lb Axles - 4 on 4 - Galvanized #AKIHUB-440-2-G-1K, which have a 4 on 4 bolt pattern and…

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What Does BTR and BT8 Mean when Picking Out Replacement Trailer Hub

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