1. Trailer Spindles
  2. Redline
  3. For 3500 lb Axle
  4. Standard Spindle
  5. 1-1/2 Inch Diameter
  6. Square
Spindle 1.5" SQ x 4" STUB (1750 lb)

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

Item # SP20484
lowest price pledge
Retail:$63.89
Our Price: $45.36
You Save: 29%
Trailer Spindles
Orders above $99 qualify for Free Shipping
Shipping Weight: 4 lbs
Quantity: 
In Stock, Ships Today
Spindle 1.5 Inch SQ X 4 Inch Long Stub
zoom in icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Videos

Lowest Prices for the best trailer spindles from Redline. Spindle 1.5" SQ x 4" STUB (1750 lb) part number SP20484 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (16)
  • Q & A (85)
  • Videos (1)
  • Photos
  • Why etrailer?

Redline Trailer Spindles - SP20484

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


  • Includes washer, castle nut and pin
  • Works with hubs that have L44649 and L68149 bearings
Diagram

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


SP20484 Spindle 1.5" SQ x 4" STUB (1750 lb)







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.




Video Transcript for Redline Trailer Spindles - Standard Spindle - SP20484 Review


Customer Reviews

Spindle 1.5" SQ x 4" STUB (1750 lb) - SP20484

Average Customer Rating:  4.6 out of 5 stars   (16 Customer Reviews)


- SP20484
by:

I am building a custom trailer and these stub axles fit the bill exactly. Loved the personal service and the help. I tried a few other sources before going online to order from etrailer. [An online tool retailer] was one and their online site was a mess without help and so was a retail location. etrailer, was quick to find me exactly what I needed and got me fixed up in just a few minutes. From now on all my trailer needs will be fulfilled from etrailer!!! 466158



- SP20484
by:

I received my order on time, the package was a little beat up from the weight of 4 hubs and 4 spindles. They maybe could of used a little better protection inside the box as they were a little rough when I opened them, but they will still work fine. 341381



- SP20484
by:

Product was received on time and was just what we needed. We had to get our trailer back into service quickly and the spindle we required was shipped out fast, and we were able to install it in our shop and get back to work. Thanks for a good product and great service. 558649



- SP20484
by:

good quality, shipped in good protected wrapping, I use these in an unconventional way I install on side of trailer and mount complete hub assembly, with spare tire, if loose bearing or hub or lug nuts, I have everything needed to repair, plus spare tire. 297923



- SP20484
by:

waited a few weeks for a few items, but was updated several times while I waited. the components all look great, good workmanship and such. only have a few miles on the set. will give a update after we have put some miles on them. thank you 468205



- SP20484
by:

Thanks & fast shipping and nice perfect fit 1 1/2 square tube to 2" square tube 1/4 thick ! Thanks John Sliva 430570



- SP20484
by:

They worked very well 309860



- SP20484
by:

Package was on the doorstep last night when I got home from work...very impressive service, tech support, and delivery time, thank you! 294598



- SP20484
by:

EXCELLENT QUALITY PRODUCT 235051



- SP20484
by:

etrailer always provides easy ordering options as well as fast order processing and delivery. Thanks, very happy. 211946



- SP20484
by:

Product arrived as promised Parts look excellent Look to be correct for my application Now to see if they hold up Which I feel they will Thanks 184716



- SP20484
by:

Your products and service are first cla ss. 173402



- SP20484
by:

The axel stubs are very nice quality and will be easy to weld to my 2 X 2 Box Tube axel. I have had very good support from ETrailer for my home built trailer project. Thanks 129410



- SP20484
by:

Timely and good 128963



- SP20484
by:

Just what I was looking for. 122292



- SP20484
by:

havnt used them yet but they look damn good :p 107380


16
16

Ask the Experts about this Redline Trailer Spindles

  • Replacement Bearings and Seal for #84 Squared Spindle
    I'm not quite sure where you measured on your spindle because the F location on the attached photo should be the length of the spindle that inserts into your axle and it shouldn't have a diameter. With that being said, I think you have a #84 spindle like part # SP20484 which means the correct replacement bearing kit for you is part # BK2-100. I recommend you compare your spindle measurements with the attached image before going with this option though. If you are needing to replace both...
    view full answer...
  • Help Picking Out Replacement Trailer Hub for Tapered Spindle with No Steps
    What is the beginning diameter on the taper and what is the ending diameter of the taper? That might be easiest way. Does the taper resemble this spindle # LC134563? This is our only spindle we have that doesn't have a noticeable step for each section and instead is more of a continuous taper. This is a 3,500 lb spindle and has bearing surface diameters of 1.06 inch and 1.38 inch. I attached a link to a page that has all of the hubs that would fit this spindle if so.
    view full answer...
  • Axle Kit for Fabricated Ice House Trailer
    All of our trailer spindles are shown on the linked page, but none of these has a stub end to fit 2 x 3-inch tubing. All are either round like # R20384EZ or square like # SP20484. For a fabrication project like yours a better solution may be a bolt-on axle-less suspension kit from Timbren, such as # A12RS440, which is rated for 1200-lbs and which includes idler hubs with the 4-on-4-inch bolt pattern. Bearings, races and seals are included with hub. All Timbren axle-less kits and beam...
    view full answer...
  • Weld-On Spindle for Trash Trailer Without Suspension
    If you don't need any suspension, then you can use a square pipe and the Spindle 1.5" SQ x 4" STUB (1750 lb) # SP20484 you referenced welded directly to the trailer. I don't recommend welding the spindle without more support to disperse weight as a bump could cause that spindle to break or bend without more support. I assume you will be using for light loads but it is probably worth mentioning that no suspension cuts a trailer's capacity in half so with the unknown capacity of your...
    view full answer...
  • How to Determine if Trailer has 84 Spindle to Pick Out Replacement
    In order to verify the spindle dimensions so that you can pick out the correct hub/drum you have to get exact dimensions. For that you need to use a digital caliper like part # PTW80157. For how old your trailer is this is especially important as the standard spindles sizes have changed since 1969. An 84 spindle would measure 1.06 where the outer bearing rides, 1.38 where the inner bearing rides, and 1.73 where the seal rides. For a hub with a 6 on 5-1/2 inch bolt pattern that would...
    view full answer...
  • Available Sizes of Trailer Axle Spindles
    Redline EZ Lube Spindle # R20384EZ does include a brake mounting flange already welded in place. The linked page displays all of our spindle products which include square-stub spindles without brake flanges like # SP20484. We do have 1-3/4-inch spindles but note these all have a round stub end, not a square stub. Spindles should be selected based on the axle's weight rating. This ensures the spindle has enough capacity to match the axle.
    view full answer...
  • How to Identify Compatible Hubs for Vintage Utility Trailer
    Thank you for the photo of your vintage utility trailer's spindle. The simplest and surest way to identify a compatible trailer hub is to identify the inner and outer bearings and the grease seal it uses. Matching up those components along with the axle weight rating and the hub bolt pattern is pretty much it. However, in your case I can tell you up front that we have only a few hubs that use a bearing whose inner diameter is as small as 0.75-inches. Bearing # LM11949 has an inner diameter...
    view full answer...
  • What Size Axle Does a #84 Spindle Fit
    A true 1 inch spindle is a BT8 spindle. The next closest one would be the BTR spindle which is commonly referred to as a 1-1/16 inch spindle and is more common than the BT8. Both of these are typically used with 2,000 lb axles. A #84 spindle is bigger and is used for 3,500 lb axles. Common sizes for these are 2-3/8 inch round axle, 3 inch round axle, and 2 inch square axle. I have attached a helpful article that shows the different spindle selections that we offer and what size axles...
    view full answer...
  • Where to Measure on Trailer Spindles to Determine Replacement Hubs
    You will need to measure the diameter of the spindles where the seal and bearings ride. Check out the picture I attached that shows where this is. You will need an exact measurement so either a digital or dial caliper will be needed. To pick out the correct hubs you will also need to determine the bolt pattern of the hubs you currently have so that the new ones will be compatible with your current hubs. I attached an FAQ on how to determine this. If you get back to me with that information...
    view full answer...
  • 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...
    view full answer...
  • Spindle Recommendation for Fitting a Galvanized Hub on a Trailer
    We have a 2,000 lb axle capacity hub that is galvanized as part # 8-258-50BTUC1. For a spindle that will fit this hub the part # R104BT8 would be what you'd need.
    view full answer...
  • Brake Mounting Flange Location Measurement on Spindle # R20384EZ
    We only have one spindle with the brake flange for me to measure. The EZ Lube Spindle 1.75" RD x 3" STUB # R20384EZ has a measurement of 1.23 inches from the step in the spindle to the outermost part of the brake flange. I've attached a photo to assist. The brake flange # 4-34 or # 4-35 needs to be welded perfectly perpendicular to the axle so it is recommended to have a professional with a jig do this welding. There is not a brake flange fit for the square axle spindle # SP20484.
    view full answer...
  • How to Tell if a Trailer Spindle is Damaged or Needs to be Replaced
    If you remove the hub and wipe away the grease on the spindle you can check to see if it is damaged. Look for an scarring, gouges, discoloration, or scoring on the spindle. If the spindle is damaged then the bearings won't ride properly and can fail again or it can cause other problems such as uneven or excessive tire wear and ride quality problems. If the spindle is damaged then you can't really repair it and the whole axle should be replaced. I doubt that this is the case based on...
    view full answer...
  • Old Trailer has 2 Different Sized Spindles and Obsolete Bearing and Seal Numbers
    That looks like a mobile home axle. It is possible that both axles are mobile home axles. But the problem with that is they are meant for one time use only. People get them because after they are used they are cheap. It is possible that this is also why the axles have two different sets of bearings. It is also extremely difficult to find parts for mobile home axles. The 2788 and 1779 bearings are associated with hub 22834 which is not available. The seal sounds like a # 29031 which has...
    view full answer...
  • Spindle Recommendation for a Square 2x2 Axle
    For your 2 inch by 2 inch axles you would want a Redline Spindle for Square Axles # SP20484. This is a square spindle designed for 2 inch square axles so it should work for well for you. Check out the review video I attached. The EZ Lube Spindle # R20384EZ you referenced is designed for round axles so it would not work for you. Spindles should be welded on by a qualified welder.
    view full answer...
  • Looking for Grease Seal Bushing
    The surface of the # SP20484 where the grease seal rides is an integral part of the spindle, not a bushing. We do offer some Bearing Buddy grease seals like # BB60002 that provide a bushing like the one you speak of, but nothing that would work with the specific # SP20484 spindle you referenced. If you use a different spindle, I would be happy to recommend the proper Bearing Buddy grease seal for you, if one is available. If you would care to provide me with the inner and outer bearing...
    view full answer...
  • 84 Spindle with Brake Mounting Flange Recommendation
    Adding brake mounting flanges to a spindle is something that only a qualified welder with experience welding them on should do. A much easier solution would be to go with a spindle that has a flange mounted to it already like the part # R20384EZ that would fit the same hubs as the # SP20484 that you referenced. Also, the # SP20484 is a square spindle and we only offer flanges for round spindles.
    view full answer...
  • 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....
    view full answer...
  • Replacement Trailer Hub that Uses Bearings with Inner Diameters of 1.25 and 0.75 Inches
    Based on the measurements you have provided hub # AH15450ECOMP is a close match. The bearings that it uses fit on spindles with the measurements you have provided. But the seal has an inner diameter of 1-1/2 inches. It is not uncommon for the seal inner diameter to be smaller to provide a tight fit. This is an agricultural hub so it isn't very common and being an aggie hub means it is limited to 20 miles per hour. It might be more beneficial to replace the axle on the trailer to get...
    view full answer...
  • Spindle Recommendation for Trailer Hub with Bearing Dimensions of 1.25 and 1.75 inch
    The spindle you would need would be one that has the number 42 dimensions. The part # R50342EZ would fit and has a 5 bolt mounting flange for the brake assemblies. These have a 2,600 lb capacity per spindle. I attached a review video for you to check out as well as a picture that has all of the dimensions of the spindle listed.
    view full answer...
  • 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...
    view full answer...
  • Does Spindle Portion of Redline Spindle SP20484 Go Into Inside of Square Bar Stock
    The round spindle portion of Redline part # SP20484 is welded to the end of the square bar stock. It does not go inside the bar stock at all; they butt up against one another. You can cut the bar stock to reach a shorter overall length but it is very important that that cut be perfectly square and very clean. Otherwise you can have problems achieving a solid weld to the axle beam. All spindles we offer are shown on the linked page. It is often easier, and sometimes less costly, to...
    view full answer...
  • Recommended Hub Assembly For 1 Inch Diameter Spindles
    For a 1 inch in diameter spindle, I recommend the Trailer Idler Hub Assembly for 2,000-lb Axles - 4 on 4, # AKIHUB-440-2-1K. If you have the EZ lube Axles, the Trailer Idler Hub Assembly for 2,000-lb E-Z Lube Axles - 4 on 4, # AKIHUB-440-2-EZ-2K, are the hubs you will want to fit your spindles. The 1-1/16 inch hub assembly you mention will give way too much movement. The bearings and races are sized to the thousandth of an inch.
    view full answer...
  • Tips for Determining Square Trailer Axle Capacity
    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 like you did. The numbers you listed do not match any of the spindles we carry though so I was not able to determine anything from that. The bolt pattern of the hubs on the trailer is typically used on 2k-3.5k axles, most 15 inch wheel trailer setups have...
    view full answer...
  • Can 15 inch Trailer Wheels be Replaced with 14 inch Trailer Wheels
    To go from a 15 inch trailer wheel to a 14 inch trailer wheel would only require you to match up the bolt pattern of what you currently have with what you would like to install. You will first need to determine what bolt pattern you have on your wheel. I attached a link to a help article that details how to do this. In the 14 inch trailer wheel size we have only the 5 on 4-1/2 inch bolt pattern. This is a very common bolt pattern though. You have the choice of a 215/75-14 like...
    view full answer...
  • What Size Spindle do Bearings L68149 and L44649 fit on
    Yes, you are going to want a spindle that has the 1.063" and 1.378" measurements. This is commonly known as a #84 spindle and can be found on our site with a few variances. For example, the Redline EZ Lube Spindle # R20384EZ comes with a brake mounting flange and a grease zerk fitting while the Redline Spindle # R20484 does not come with the flange or a zerk fitting. These fit the typical round applications but we also have one for a square application with part # SP20484. Any of...
    view full answer...

Do you have a question about this Trailer Spindle?




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality trailer spindles for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer spindle information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Expert Research:
Mike L
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Adam R
Expert Research:
Rachael H
Expert Research:
Jeffrey L
Updated by:
Sarah W

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.


Product Experts Available Now!

Call 800-298-8924