Trailer Spindles > Standard Spindle > 4 Inch Long > 1-1/2 Inch Diameter > For 3500 lb Axle > Square > Redline

Spindle 1.5" SQ x 4" STUB (1750 lb)

Code: SP20484

Retail:$52.90

Price:$36.95

Shipping Weight: 5 pounds

Shipping Special

Part No.	Capacity	A	B	C	D	E	F	Round/Square
SP20484	1750 lb	1.50	1.73	1.38	1.06	1.00	4.00	Square

Video of Spindle 1.5" SQ x 4" STUB (1750 lb)

Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.

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Expert Answers about Spindle 1.5" SQ x 4" STUB (1750 lb) - SP20484 Do you have a question about this Trailer Spindles?

How to Determine Hub and Spindle Size
The spindle dimensions are as follows: A is the mounting dimension, B is the seal dimension, C is the inner bearing surface, D is the outer bearing surface and E is the diameter of the threaded portion of the spindle for spindle nut selection. Say you need a spindle and hub for a wheel with 5 on 4-1/2 inch bolt pattern and an axle that is 3500 lbs. For a single axle trailer you can use two of either the item # R20484, if your axle is round or item # SP20484 if your axle is square. Then you
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Welding Redline Spindles # R40484 and # R50642 for Utility Trailer with 2-3/8 inch O.D. Pipe
You have a 2-3/8 inch O.D. pipe so you might want to look at Redline Spindle 2 inch x 4 inch Round Stub, # R40484, which has a 2 inch O.D. at the weld point and has a 1750 lb. capacity, so two spindles will give that axle 3500 lb capacity or Redline Spindle 2-1/4 inch RD x 6 inch STUB, # R50642, which has a 2.25 inch O.D. at the weld point and has a 2500 lb. capacity for a total capacity of 5000 lbs. The total capacities of the spindles are only valid if installed correctly and the axles are not
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Does a Spindle with Scarring are Complete Bearing Failure Need to be Replaced
What concerns me about this situation is the scarring on the spindle. Depending on how deep and how bad the scarring is, a new set of bearings and a new hub/drum assembly might experience the same problem down the road. This would mean that the spindle would need to be replaced also. Otherwise, you may have to frequently replace parts. It would be best in this situation to eliminate the possibility of future similar occurrences before they have a chance to cause damage. Any visible scarring or h
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Are Trailer Spindle # SP20484, Hub Assembly # 8-258BTUC1, and Tire/Wheel Combo # AM31985 Compatible
The Redline Trailer Spindle, # SP20484, is compatible with Trailer Hub Assembly # 8-258BTUC1. The hub assembly is designed for use on a 12 to 15 inch wheel with a 5 on 4-1/2 bolt pattern. The tire and wheel combo you have selected, # AM31985, is a match. So you will be able to use all of these components together. The hub assembly comes with the bearings, races, cap, lug nuts, and seals.
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How to Determine the Correct Replacement Hubs for a Trailer with a 3,500 Pound Axle
There are a couple of things you can look at to determine the correct replacement hubs. The best way is to retrieve the inner and outer bearing numbers that are stamped into the bearings. I suspect that you will have the Trailer Hub Assembly, # 84545UC1-EZ, which uses L68149 Inner/L44649 Outer bearings and E-Z lube axles. Or, for a hub and drum, # 84546UC3-EZ, which is the same but has the hub and drum for drum brakes. But, the best way to know is to check your bearing numbers. The other t
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Determining Replacement Hubs for EZ Lube Spindles
EZ Lube spindles are compatible with all idler hub and brake hub and drum assemblies, and the only difference is the seal and grease cap. To determine the correct replacement hub for your trailer, you will need to pull off your existing hubs to determine the bearing numbers. The difference between the EZ lube hub and drums and the non EZ lube hub and drums is the grease cap and seal. The EZ lube ones like the # 84546UC3-EZ have a removable rubber seal on the cap that allows you to access the
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Spindle Measurement of Part # SP20484
The F measurement is the length of the square portion of the spindle stub, which can either slide into the end of the axle and be plug welded in place or more commonly welded to the bottom of the axle tube. As long as the spindle is going on a 3500 lb axle and the rest of the dimensions match (B, C, D and E), it is not so important that the F dimension match perfectly, just as long as it is not dramatically shorter than the spindle it replaces.
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How to Determine the Correct Replacement Hubs for a Tracker Marine Boat Trailer
What you are going to have to do is pull off one of the hubs, something you will have to do eventually any way, and get the inner and outer bearing numbers. The numbers are stamped into the metal of the bearings. With these numbers I can tell you exactly what you need as replacements. The wheel size and bolt pattern of the wheel will also help. I have included a link to a video that will help.
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Determining the Capacity of a Square Trailer Axle
Square axles can be tough to determine capacity. Often times the same spindle fits a range of axle capacities. The best way to determine the capacity is to get the inner and outer bearing numbers stamped into the metal of the bearings. Going by those numbers, wheel size, and bolt pattern, we can determine the probable axle capacity. I have included some links that might help. There could also be a plate on the axle itself that lists the capacity. The most common place to find axle capacity is
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