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Spindle 1-1/2" Square x 4" Long Stub, for 2,000 lb. Trailer Axles

Spindle 1-1/2" Square x 4" Long Stub, for 2,000 lb. Trailer Axles

Item # SP204BT8
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SP204BT8 - For 2000 lb Axle Redline Trailer Spindles
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Lowest Prices for the best trailer spindles from Redline. Spindle 1-1/2" Square x 4" Long Stub, for 2,000 lb. Trailer Axles part number SP204BT8 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (27)
  • Q & A (53)
  • Videos (1)
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  • Why etrailer?

Redline Trailer Spindles - SP204BT8

  • For 2000 lb Axle
  • Standard Spindle
  • 1-1/2 Inch Diameter
  • Square
  • Redline
  • 4 Inch Long


  • Includes washer, castle nut and pin
  • Overall length: 8-3/4"

Part No. Capacity A B C D E F Round/Square
SP204BT8 1000 lb 1.50 1.24 0.99 0.99 1.00 4.00 Square





Video of Spindle 1-1/2" Square x 4" Long Stub, for 2,000 lb. Trailer Axles

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 - SP204BT8 Review


Customer Reviews

Spindle 1-1/2" Square x 4" Long Stub, for 2,000 lb. Trailer Axles - SP204BT8

Average Customer Rating:  4.9 out of 5 stars   (27 Customer Reviews)


- SP204BT8
by:

Free shipping, 50 lb. Package, arrived on my doorstep in three days. 748779



- SP204BT8
by:

Excellent Service 703764



- SP204BT8
by:

Perfect! 565195


Comments
Doing just fine.
Ted K - 09/16/2019

61196

- SP204BT8
by:

Simply super parts and service. I have plans to build an Ice Fishing house Will post when completed Thanks again 551794



- SP204BT8
by:

You always have what we want at a good price and you ship it promptly. Can’t ask for more. 505446


Comments
I appreciate your follow-up. It is evidence that your company cares. All is well here and I’m sure we will be shopping at etrailer in the future.
Christopher - 05/07/2019

54961

- SP204BT8
by:

I updated my heavy duty tractor drawn garden dump trailer with these new stub axles as well as new hubs, rims and tires. For my application these square axle stubs fit perfectly into the trailer's round axle tube. (sounds weird I know, a square peg in a round hole) Then you just have to locate them where you want them in the axle tube and drill through the square end of the stub so you can install a securing bolt. They have had heavy use for the last year. No issues at all. 493939



- SP204BT8
by:

We use them regularly to manufacture Heavy Duty Industrial Carts and they work great. 472330



- SP204BT8
by:

Good product at a good price. Meet my needs perfectly. 452002


Comments
Good
Buddy W - 11/14/2018

45711

- SP204BT8
by:

Excellent service very satisfied 424819



- SP204BT8
by:

Always great and prompt service. Qualtiy of shaft works well for welding 389557



- SP204BT8
by:

We have been very satisfied with the products purchased for our operations. We utilize these components for our commercial operations mostly off road and they have held up very well. Etrailer has proved to be a valuable resource for us both in the quality of components that we utilize from them as well as the price point at which they sell the products. We will continue to utilize them in the future as we grow. 321228



- SP204BT8
by:

Thanks so much for such good service. I haven't installed the spindles and hubs yet but plan to in the near furture. I am well satisfied with my order. I needed some advice before I ordered, so I called and talked to Patrick , if I remember correctley. He was big help. Thanks again for great service and products. 301192



- SP204BT8
by:

Order spindle for boat trailer, great quality, fast shipping, good price. 281260



- SP204BT8
by:

Spindle fit perfectly as replacement for old one. Package arrived right on time. I would recommend etrailer to anyone looking for quality trailer parts 257046



- SP204BT8
by:

They fit perfectly 248568



- SP204BT8
by:

works great 248006



- SP204BT8
by:

Perfect fit. A+ machine work. 238812



- SP204BT8
by:

Prompt Service, Great Prices! Wide selection of items. High quality parts with a helpful informative staff. 234144



- SP204BT8
by:

Product was exactly as expected 190180



- SP204BT8
by:

Exactly what I was looking for, Perfect and great price. Thank you. 189897



- SP204BT8
by:

Good quality. Works exactly as expected. 188868



- SP204BT8
by:

Strong material, good price, fast shipp ing 183616



- SP204BT8
by:

exactly what I was looking for. 179588



- SP204BT8
by:

Part is exactly what I needed and shipped quickly! 156533



- SP204BT8
by:

Item as described, prompt handling and fast shipping, excellent selection and value. 154960


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27
Show More Reviews

Ask the Experts about this Redline Trailer Spindles

  • Trailer Hub w/6 Lug Pattern, Inner Bearing Inner Diameter 1.5", Outer Bearing Inner Diameter 1.25"
    Bearing measurements need to be as accurate as possible, to at least the thousandth of an inch, and require calipers such as # 301-17068 if you have to measure them. Otherwise look at the bearing numbers that are stamped into the sides of the bearings. With those numbers we can determine a lot about the running gear and if anything else will fit. If the measurements are exactly 1-1/2 and 1-1/4 inches then the only option we have would be agricultural hub # AH30660FCOMP which has a 6...
    view full answer...
  • Length of Spindle that Uses 1 Inch Inner and Outer Bearing
    A standard spindle that fits 1 inch bearings for both the inner and outer is a BT8 spindle like part # SP204BT8. This spindle measures about 4-3/4 inches from its base to the end. The bearing kit that fits the BT8 spindle is part # BK1-100.
    view full answer...
  • Determining Axle Length for Home-made 4 x 8 Trailer Using Square Stub Spindles
    You can use the 8-3/4-inch overall length of the Redline 1-1/2-inch Spindle # SP204BT8 to help you determine the correct length for your axle tube. You also need to take into account the width of the tires you intend to use as these also will increase the width of the overall combination of the axle, spindle, hub and wheel. Start with the overall width of the trailer and its fenders/wheel wells, subtract the widths of your two chosen wheels and the lengths of the two spindles to determine...
    view full answer...
  • How to Measure a Trailer Spindle to Determine What Hub Could Replace
    You are on the right track by measuring dimensions of the spindle with a dial caliper, but to determine which hub could potentially fit your spindle you need to measure it where the bearings and seal rides. See pic to see where to measure. If you can get back to me with that info I will be able to determine if there is a hub that could fit.
    view full answer...
  • Identifying Replacement Wheel Bearings for Unknown Hubs on Boat Trailer
    The easiest way to identify the needed replacement bearing kit is to obtain the reference numbers off the existing bearings. Your best bet would be to clean the existing bearings and closely examine them for the reference numbers. Given the inside diameter you provided, the bearings could be a # LM67048, # 15123 or # 14125A, all of which have a 1.25 inch inside diameter. All three bearings are listed as outer bearings for certain hubs, none of the hubs we offer would use these as both...
    view full answer...
  • How to Pick Out an Axle for a 6 x 12 Utility Trailer
    Basically you will want to measure your trailer to determine where you will want the wheels of it to be so that you can pick out the correct length axle. There is not a set length of axle that a 6 x 12 trailer should take so you will have to determine about where you want the wheels to be and then measure the distance between where the mounting flange of the rims would be. The only size 3,500 lb axle we carry is the part # 35545I-EZ-89 which will have a distance of 89 inches from hub...
    view full answer...
  • Process for Changing a Damaged Spindle on a Trailer Axle
    Replacement of a spindle on a trailer axle is best left to a professional installer. This is not a do-it-yourself type of project. We urge you to use a professional welder experienced in axle fabrication. Proper alignment and welding are critical to safe operation of the trailer. Depending on the condition of the axle you may be better served by replacing the entire axle/spindle assembly. Although the axle adds to the parts cost, you will save on the labor side. A new axle with spindles...
    view full answer...
  • Removing and Replacing Trailer Spindles
    To replace a spindle, the old one would need to be cut off, and the new one welded into place. This is NOT a job for the do-it-yourselfer. The new spindle must be absolutely square with the axle in order to prevent premature tire wear and wheel tracking problems. I would recommend finding a welder who is experienced with trailer axles. Your local RV dealer or repair facility could probably refer you. In many cases, it's less expensive to simply replace the trailer axle itself. We offer...
    view full answer...
  • Spindle and Hub Combination to Fit 4.80 X 12 Tires and Wheels on a BBQ Grill Build
    When manufacturing axles for a wagon/trailer you will need to measure the inside of the square tube that you will be using for the axle. Once you know this measurement then you can pick the correct spindles and idler hubs. One spindle that would work well for your build would be Redline 1-1/2 Inch Square X 4 Inch Spindle # SP204BT8. This spindle has a square mount shank that will fit an 1-1/2 square tube. This spindle will have to be welded to the axle. It is recommend that this be done...
    view full answer...
  • Trailer Spindle Got a Nick In it from a Grinder Should the Axle be Replaced
    How deep is it? It is hard to tell from the picture. You may be able to use some emery cloth and take care of it unless it is too deep. Then you would want to go ahead and replace the axle. Even though spindles are available by themselves you would need special equipment and experience to weld on a new one so that it is straight. Replacing the axle is the safe bet. I have included a link to the axles we carry to the right.
    view full answer...
  • Can a Trailer Spindle with Grooves Still be Used if Bearing Fits
    You will have to replace the spindle. Grooves that can't be taken out with emory cloth will eventually cause new bearings to fail which will leave you stranded with a locked up wheel most likely. To replace a spindle, the old one would need to be cut off, and the new one welded into place. This is NOT a job for the do-it-yourselfer. The new spindle must be absolutely square with the axle in order to prevent premature tire wear and wheel tracking problems. I would recommend finding a...
    view full answer...
  • How to Check for a Bent Trailer Axle Spindle
    Assuming your tires are in good shape without any bulges the easiest way to determine if you have a bent spindle is to take a straight edge that is longer than the tire and lay it across the tire parallel with your trailer frame and then measure the distance from the frame to the straight edge in front and back of the tire. If the distance is the same then the spindle isn't bent. Beyond that your best option would be to take the trailer to someone qualified in trailer repair to have...
    view full answer...
  • Recommended Replacement Axle For Homemade Trailer
    My recommendation is to replace the entire axle. That way you would not have any issues with replacement hubs, bearings, races, and other components you need for your trailer. I have attached a link to our product page for the axles we offer with idler hubs. You would need to measure your trailer to find the correct size axle. If you find you can use a 60 inch axle measured hub face to hub face I recommend part # 20440I-EZ-60. This includes the idler hubs with bearings, races, and seals....
    view full answer...
  • How to Determine Spindle Size for a 2004 Triton Elite WCII PWC Trailer
    There are two ways to determine what spindle you have on your 2004 Triton Elite WCII Jet-Ski trailer. The first way is to look at the number that is stamped on the bearings that you removed when you took the hub off. The second way is to use a dial caliper and get the measurements and find the spindle that matches those measurements. The new spindle must be absolutely square with the axle in order to prevent tire wear and wheel tracking problems. I would recommend finding a welder...
    view full answer...
  • Can Damaged Axle on 1999 Shorelander Boat Trailer Be Sanded Smooth
    In all honesty, you're almost certainly going to be best off by replacing the axle. The spindles are likely gouged in the locations where the bearings ride. The act of sanding out the damaged area of the spindle has likely removed some material to the point where the spindle is no longer within its diameter specifications. This means the bearing won't fit well on the spindle, and might spin against the spindle which can cause it to heat up to the point where it could be damaged. We...
    view full answer...
  • Availability of 1 Inch Diameter Trailer Spindle To Fit on 1.25 Square Axle
    The two spindles that I have to fit a square axle are designed with a square stub diameter of 1.50 inches. The Redline Spindle, part # SP204BT8, you have referenced is for 2,000-lb axles and the Redline Spindle, part # SP20484, is for 3,500-lb axles. They use different bearings and seals. I am including a link to a product page that will list the dimensions on the trailer spindles we have available. Square axles can be tough to determine capacity. Often times the same spindle fits...
    view full answer...
  • Do Trailer Bearings Fit Tight To the Spindle they Install On
    Bearings fit pretty tight onto spindles. There basically should be no play at all between the inner portion of the bearing and the spindle. They don't fit so tight that they would have to be pressed on, but they sometimes can be tight enough that they require a bit of effort to get them totally slid on. Check out the install video I attached for more info on how bearings install.
    view full answer...
  • Why Are There Both Round and Square Trailer Axles Used on RVs
    Most of the OEM axles installed in RVs and most of the replacement axles we offer are indeed round in cross section. We do offer some square stub spindles for use on square axles, such as # SP204BT8, but these are usually limited to lower capacities like utility trailer applications. We do not have the ability to ship high-capacity axles due to their weight.
    view full answer...
  • Could a Hub Get Replaced on the Side of the Highway
    Spindles get welded to axles so there really is not an easy way to replace one on the side of a highway. The best advice I could give to you would be to periodically check the condition of the bearings on your trailer and be sure to grease them regularly and you should have a pretty reliable trailer setup. If you had a replacement hub in your vehicle you could pretty easily swap one if needed. Check out the video I attached on bearing inspection for you.
    view full answer...
  • Is It Possible to Just Replace Trailer Axle Spindle if Axle is Still Good
    If your axles are fine you can replace just the spindle and be totally fine. This is a common enough situation which is why we offer just replacement spindles like the part # SP204BT8 that you referenced. Trailer spindles must be installed by a qualified professional welder. Spindles must be welded on perfectly concentric or you will have tracking problems. A trailer shop will have the right jigs to allow the spindle to be welded on correctly.
    view full answer...
  • Replacement Spindle With Bearings L44643 for Square Axle
    Since you have a pair of # L44643 bearings and a square axle, the right replacement spindle for you would be # SP204BT8. It is recommended that replacement spindles be welded on by a qualified welder, preferably one experienced with trailer axles. Also, if you are looking to replace your bearings, races and grease seal, you would need Bearing Kit # BK1-100. I've added links to review videos on the spindle and bearing kit for you to take a look at.
    view full answer...
  • How to Use an 18 Inch Diameter Wheel on a Trailer
    I understand the look of using the same tire on the trailer as the tow vehicle but there are not going to be any performance benefits. In fact, using a passenger tire on a trailer is actually going to give you less performance than using a special trailer tire. The issue is that passenger tires do not have the sidewall capacity that is needed for use on a trailer. Trailer tires are going to experience much more flex than a passenger tire so the sidewalls need to be much stronger. I can't...
    view full answer...
  • Can 1,500 lb Trailer Axle be Swapped for 3,500 lb Axle
    What you are looking to do is very possible. It would just be a matter of picking out the 3,500 lb capacity trailer axle that matches the dimensions your trailer needs. Also, the welder you spoke with is spot-on with recommending buying an axle with the flange already installed as they are actually harder than you'd think to weld on since it requires special jigs so that the alignment is right. So to pick out an axle the two important dimensions you need is the distance from hub face...
    view full answer...
  • Most Accurate Way to Measure the Length of Axle
    When it comes to the bearing that rides on the spindle, there really is nothing to keep it from rotating other than the compression from tightening the spindle nut. The most accurate way to determine the length of your axle is to measure the distance from hub face to hub face (A) and spring center to spring center (B). I have attached a picture to illustrate this measurement. With only one hub on the trailer, to obtain measurement A you would need to double measurement C and add it to...
    view full answer...
  • How to Determine what Replacement Hub and Bearing Kit
    Thanks for sending a couple pictures! An agricultural spindle is mainly used in agricultural settings and best at low speeds. The best way to determine the correct parts for your homemade trailer, is to remove the hub from the trailer and either get part numbers from the inner and outer bearings and races, and grease seal or measure the spindle in 3 places and the hub in two places. I have included a photo showing the places to look for part numbers and places to measure. If the...
    view full answer...
  • What Might Cause Tire Inner Sidewall Rubbing on Trailer Frame
    Sounds like your trailer axles are a bit too short if the inner sidewall is rubbing on the frame of the trailer. Did you recently change to a wider tire? That could be the cause too. Your equalizer being angled shouldn't cause the issue you described but it might be an indicator that parts are worn out or the hangers are at the wrong distance between each other.
    view full answer...
  • What Size Square Stock Should be Used with BT8 Spindle to Make an Axle
    The bar stock you use should be at least the size of the square part of spindle # SP204BT8 which is 1-1/2 inches. Square axles are normally found in 1-1/2 inch and 2 inch sizes and there are suspension u-bolt kits for these sizes so I would not recommend using a different size because it might become difficult to source parts.
    view full answer...
  • Picking Out Trailer Hub for Trailer
    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 wheels. I attached an FAQ article on determining bolt pattern for you to check out. Next thing you will need to know is what spindle you have on your trailer. In order to do that you can either get the inner and outer bearing numbers from a hub...
    view full answer...
  • Single or Tandem Axles for Homemade 24 ft x 98 Camper?
    Most campers that long are tandem axles so I would go that route. I took a look at some common GVWR's for campers of that size and it was in the 5,000 lb - 7,000 lb range so you need to keep that in mind; something like the 89" Dexter Trailer Axle Beam with E-Z Lube Spindles # 8327830 might work. You can also take a look at the help article I've added about where to position your trailer axle which should be useful.
    view full answer...

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Info for this part was:

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