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Brake Mounting Flange for 3" Round Axle

Brake Mounting Flange for 3" Round Axle

Item # 4-44-1
Our Price: $39.44
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Shipping Weight: 0.85 lbs
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Redline Accessories and Parts - 4-44-1
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  • Reviews (32)
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  • Videos (1)
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Redline Accessories and Parts - 4-44-1

  • Trailer Brakes
  • Disc Brakes
  • Electric Drum Brakes
  • Hydraulic Drum Brakes
  • Brake Mounting Flange
  • Redline
  • 3 Inch Diameter Axle
  • 12 Inch


  • Brake size: 12" diameter assemblies
  • Bolt pattern: 5 on 3-7/8"
  • Fits 3" diameter axles (4,400 lb, 6,000 lb regular duty, 6,000 lb heavy duty, 7,000 lb and 7,200 lb axles)
    • Hole inner diameter: 2-3/4"
  • Weld-on design
  • Brake mount flange gets welded to the spindle at the end of the axle to provide a secure mounting place for brake assemblies

Dimensions of brake flange

4-44-1 Redline Brake Mounting Flange

Video of Brake Mounting Flange for 3" Round Axle

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

Video Transcript for Redline Trailer Brakes 4-44-1 Review

Today we're going to be taking a look at a brake mounting flange for a 3" round axle. The brake mounting flange gets welded to the spindle at the end of the axle to provide secure mounting plates for brake assemblies. This flange works with a 12" diameter brake assembly. It's going to come with the bolts already pressed in you can see that it's a five-bolt mount. The bolt pattern is 5 on 3-7/8", so that means that we have five bolts, and then from the center of this one to the center of this one, as well as this one to this one, it's going to measure 3-7/8". Center on center between these two is going to be 3". This is designed to fit 3" diameter axles. The bolt diameter is 3/8", so this will work with 4.400 lb, 6,000 lb regular duty, 6,000 lb heavy duty, 7,000 lb and 7,200 lb axles.

The diameter of the pilot hole, so the hole right here at the center, that's going to measure 2-3/4" in diameter. The flange itself is made from a durable steel construction, it's going to measure 1/4" thick. Taking a look at the overall measurements. Going side to side, it's going to measure about 4-1/2". Going this direction, that's going to give us a measurement of about 4-3/16". That's going to do it for today's look at the brake mounting flange for a 3" round axle.

Customer Satisfaction Score:

Customer Reviews

Brake Mounting Flange for 3" Round Axle - 4-44-1

Average Customer Rating:  4.3 out of 5 stars   (32 Customer Reviews)


Upon inspection if receiving my recent order I noticed that the packaging was sub par at best. The box didn't seem to be visually damaged externally, however the inside told a different story I ordered 2 sets of electronic brakes. Some hardware and a tub of packing grease. If you see the pictures attached, everything was thrown into a massive box without proper packing material and some of the items show signs of shipping damage. Some brakes were out of alignment and the grease canister was smashed almost to the point or rupture. For such a big company I would expect a little more care to be given to the several hundred dollars worth of parts in my order.

Etrailer Expert

Jenny N.


I sincerely apologize that the order delivered in this manner. I will have our customer service team reach out and share this with our shipping department.


I had to machine the parts so they fit my application of older mobile home axles.


This is an exelent flange if you want to convert an axel that is not allredy a breaking axel it worked great for me


The parts are exactly what I was looking and am pleased with my purchase.


High quality and well made. Made to fit the spindle of a 3" Axle. It fit, but the brakes would have been so far out on the axle that the hub would not even bolt on. Glad I checked before welding. Further investigation found that I have a shorter than average spindle length.

Mobile home axles usually come in two "basic" sizes. The "smaller" size spindle, with the 1.9" grease seal and or 1-3/8" inner bearing (the larger spindle "usually" has a 2.25" grease seal and 1-3/4" inner bearing)
If you have the Larger axle, with the 1-3/4" inner bearing and larger grease seal then this mounting flange should work.

I had the 1.9" Grease Seal and therefore a shorter spindle length, so I had to weld the brake backing plate directly to the 3" axle tube.
I put the brake assembly on the axle, reinstalled hub and bearings then tightened down. Next, put the brake assembly in the hub and adjust brakes tight to the drum while keeping both concentric. When both are tight together make sure brake adjusting holes are at bottom towards the ground and weld brake backing plate to the axle.


It is a flange for a 3” round axle. It is to be welded onto the axle. Unfortunately, the inside diameter is ONLY 2.75 “. It will not fit directly onto the axle unless you do some serious grinding. It is possible that I do not know how it should be attached but....

Etrailer Expert

Heather A.


Thank you for your review. The brake flange is designed to fit onto the spindle just behind the seals not on the 3 axle.


I've been restoring a 1979 Hudson trailer on which the brake backing plates were welded right to the axles. That makes rebuilding the brake system impossible unless you cut off the exiting material and install these flanges. This is pretty much the only way to do it.

These flanges are stout -- 3/16" plate, laser cut for precision. If you install them properly you won't have to worry about the flanges failing.

These brake flanges have to be absolutely square and concentric on the axle, and the0y need to be at the proper depth relative to the spindle. I think the best way to get it right is to dry-fit everything and then jig the flanges and the brake backing plates in position with magnets or a similar means. When everything is in alignment, tack weld the flanges to the axles, then take all the other parts off and finish your welds.


I am putting on electric brakes on Mobile home axles and needed a way to mount the new backing plates. This seems to be the way to get it done. I had great help from Greg S on how to go about it.


Works perfectly on my old trailer which had welded on backing plates. I scanned it and was able to build three more with the plasma cutter.


Bolts like up perfectly. The center hole needs to be bored out to be used on mobile home axles.
They can also be a challenge to weld square to the tube.


All the parts I ordered have arrived as promised and worked as they should, I will order from etrailer again as needed.


Careful if you get this product. I specified for a 3" tube. What I got was ID 2.754". Thankfully I have a lathe and was able to bore it out to size.

Would be nice if the parts room checked the sizes before they send instead of grabbing what was on the shelf.

Would be nice if the parts room checked the sizes before they send instead of grabbing what was on the shelf." />
Etrailer Expert

Patrick B.


The part you received is correct. The flange is for use on 3 inch axles, but it does not mount to the axle.The spindles on 3 inch axles measure 2.75 on the shoulder where the flange should be welded. It should be mounted to the shoulder of the spindle right next to where the spindle is welded to the axle.


This produce was delivered in record time. It is exactly what was needed to complete my project and get me back on the road with little to no down time. Thanks to all the team members at etrailer for their help.


the product arrived in very good condition and in speedy time. will order again from e-trailer.


Did the job, as it was pictured and described. Trailer is rolling again.


Great product and the people were great to deal with.

Larry A.




Fast shipping and great parts



Great everything is working well,,,,


Products arrived fast and fit as expected. Order more brake parts today.


Very easy ordering procedures. My order was shipped promptly and received with in one week. I will be ordering more in the future.


Just what I needed


great service, product, will do business with them again


All the products I received are exactly what I needed, thanks a lot!


Great price and quality


awesome! great products received on tim e!


Worked great!!

Show More Reviews

See what our Experts say about this Redline Accessories and Parts

  • 5-Bolt Brake Mounting Flange for 3" Axle Tube
    We do! What you're looking for is the Brake Mounting Flange for 3" Round Axle # 4-44-1. This is a weld-on installation like what you mentioned.
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  • Installation of Redline Brake Mounting Flange # 4-44-1
    On the Redline Brake Mounting Flange, part # 4-44-1, the five bolts are press fit into the flange. To be removed they would have to be pressed out with a hydraulic press. Once they are pressed out the bolts are not to be used again. So you would not want to remove the bolts from the flange. The flange needs to be welded on concentric and square. Square meaning the flange must be a true 90 degrees from the spindle and concentric meaning the gap around the spindle must be the same 360 degrees...
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  • Is a Gap Between a Trailer Brake Backing Plate and Drum Normal
    The slight gap you see is normal. The drum is not supposed to make contact with the brake mounting plate. There are some instances when mixing brands of brakes, hubs, and axles, that won't line up properly but in this case it is normal. I did also run it by another set of eyes just to make sure and we both came to the same conclusion.
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  • Where to Mount the Brake Mounting Flange 4-44-1
    I can see how that would throw you off. The Brake Mounting Flange for 3" Round Axle part # 4-44-1 is designed to mount onto the spindle just behind the seals it doesn't sit all the way inboard so it's not around the entire axle. I've included a picture to show you what I mean.
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  • Bolt Pattern of 5 Bolt Brake Mounting Flange for Trailer Brakes
    The bolt pattern for a 5 bolt brake mounting flange, like # 4-44-1 is 5 on 3-7/8 inches. What that means is it measures 3-7/8 inches from one corner to its diagonal counterpart. From hole to hole across the bottom is 3 inches and between the others is about 2-1/8 inches. I've made a diagram that may help.
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    Image 1 for
  • Is Trailer Brake Mounting Flange part # 4-44-1 Sold Individually
    The Brake Mounting Flanges part # 4-44-1 that you referenced are sold individually. If you needed a pair you would need to order a quantity of 2. Be sure to have a qualified fabricator with experience in installing flanges install them.
    view full answer...
  • Dimensions for a Brake Mounting Flange for a 3 Round Axle
    The measurements of the Brake Mounting Flange for a 3 inch Round Axle, part # 4-44-1, are correct, in that the inner diameter of the flange is 2-3/4 inches. This is because the flange will be mounted to the spindle, not the axle. You will need to check the Outside Diameter of your spindle, as this will mount on the spindle.
    view full answer...
  • Dimensions of the Brake Mounting Flange # 4-44-1
    I went and pulled a Brake Mounting Flange # 4-44-1 from our warehouse to measure it for you and found that from the center of the studs to the inside edge of the center hole it measures 1/2 of an inch and then from the center of the top bolt down to the center of the hole it measures 2 inches.
    view full answer...
  • Is there a Brake Mounting Flange that Has a 3 Inch Diameter Center Hole
    We have a 4-bolt brake mounting flange # 4-50 which has an inner diameter of 3.01 inches. This particular flange is meant for 12-1/4 inch brake assemblies usually found on 8K axles which are usually 3-1/2 inches in diameter.
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  • Brake Mounting Flange That Fits 2,000 lb Axle
    So we have brake mounting flanges, but they are all weld-on applications as opposed to bolt-on. Also, I did want to mention a 2,000 lb axle is typically 1-3/4 inches in diameter, and for that the correct part is the Brake Mounting Flange for 1-3/4" Round Trailer Axles - 2K # 4-34. That is a 4-bolt mounting flange, though we do have brake mounting flanges for 3 inch round axles, which are typically 5,200 lb to 7,000 lb axles. These are 5-bolt mounting flanges and for that the correct part...
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  • Which Brake Mounting Flange for 3 inch Diameter Axle Beam
    Given your 3 inch diameter axle beam, you have a 5200, 6000 or 7000 lb rated axle, which is compatible with a 12x2 inch brake assembly. A 12x2 brake assembly would use a standard 5 bolt brake mounting flange. For a 3 inch diameter axle beam, I'd recommend using # 4-44-1 for 3 inch axles. You'll want to have a professional welder who's experienced in trailer work install these. If they aren't installed so they're perfectly straight and concentric, you'll have no end of trouble.
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  • How To Choose The Correct Brake Mounting Flange For Your Trailer Axle
    Absolutely, in order to install a 5 bolt brake mounting flange, you will need the Brake Mounting Flange for 3" Round Axle part # 4-44-1. This brake flange bracket is designed to work with an axle diameter of 3". If your axle is smaller than this, or you want a 4 hole mounting flange. You will need the Brake Mounting Flange part # 4-35 for a 2-3/8" axle and the Trailer Brake Mounting Flange part # 4-50 for 3-1/2" axle diameters. I recommend having a professional welder perform this task...
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  • Electric Drum Brake Mounting Bolt Pattern on Dexter Trailer Brake # 23-105
    The Dexter Trailer Brake # 23-105 you referenced uses a common ALKO 5-bolt mounting pattern: 5 on 3-7/8-inches. The matching brake flange for this pattern is # 4-44-1 which fits 3-inch round axles.
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  • Will Brake Mounting Flanges be Installed on New Axle
    Whether the axles have the brake mount flanges on them will depend on what you purchased. However, since they're 6,000 pound axles it's fairly likely the flanges will be there. If not, we carry # 4-44-1 for 6,000 pound axles. It will need to be welded to the axle at a trailer shop because it needs to be perfectly square and concentric. As long as your current brake actuator is for disc brakes and functioning properly there's no need to replace it. However, if you previously had drum...
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  • Installing 12 Inch Nev-R-Adjust Electric Brake Assembly and Need Brake Mounting Flange Measurements
    When installing the 12" Nev-R-Adjust Electric Brake Assembly, # 23-459, you would need Brake Mounting Flange, # 4-44-1. I have included a picture with measurements listed. Welding of a brake mounting flange is a precision job that requires the proper equipment and someone who has performed this job many times before. If this is not mounted in the correct way, your brakes will never function properly. We have found that in most cases it is more economical and much easier to replace your...
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  • Left and Right Hand Assemblies for 12 " Electric Trailer Brake Replacement
    I recommend the Electric Trailer Brake Kit - 12" - Left and Right Hand Assemblies item # AKEBRK-6. These are 12x2 inch drum brakes that are rated from 5,200 lbs to 7,000 lbs and will fit your 5 bolt pattern. The brake pads are made of durable friction material for improved braking and longevity and E-coated backing plates that resist rust. They fit 14-1/2" to 16-1/2" wheels. If you need hubs message me back with your lug nut bolt pattern and I would be glad to make a recommendation. I have...
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  • Is There A Difference In Weight Capacity On Brake Mounting Flanges
    Thanks for providing the photo. That really helps when we are trying to provide information for customers. It looks like you have a 5-bolt brake system. We offer one 5-bolt brake mounting flange, part # 4-44-1. It is designed for 3 inch axles that range from 3,500 to 7,200 lb axles. These brake flanges are welded in place, so if you are going to replace them you will want to have the work done by a certified professional. These need to be concentric and square or the brakes will not wear...
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  • Are All 5-Bolt Brake Mounting Flanges the Same
    Most 5-bolt brakes use flange # 4-44-1. That's not to say that there aren't some oddball or older styles that might have had a different 5-bolt pattern but the vast majority are going to use what could be considered as the standard. I included a picture showing the spacing between the bolts on the 5-bolt flange.
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  • How to Find Wheel Bolt Pattern to Find the Correct Replacement Trailer Brakes
    There are a couple of methods you can use to determine bolt pattern of the wheels themselves. First, you can use the number of lugs and the bolt circle. For an even number of lugs, measure the center to center distance of 2 lugs directly across from each other. If you had 6 lugs and the distance measured is 5 inches, you have a 6 on 5 bolt pattern. For an odd number of lugs, it is a little more difficult. Measure from the center of 1 lug directly across to the center point between 2 lugs...
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  • Replacement Brake Mounting Flange and Assemblies for 2003 Wehaul Snowmobile Trailer
    Most likely what you need for a brake flange is the part # 4-35 which has the standard 4 on 2-7/8 inch bolt pattern measured on center but you should measure yours again to be sure. This is a very common bolt pattern whereas 3 inches is not an option that we carry. This also fits the standard 3,500 l trailer axle diameter of 2-3/8 inches. So based on that the assembly set that you'd need is the part # AKEBRK-35-SA. This is a self adjusting set of brakes that fits a 10 inch hub/drum.
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  • Recommended 12 X 2 Electric Trailer Brakes to Replace Hadco Assemblies
    We have a large selection of 12 x 2 electric brake assemblies available, which I have linked for you to look through. I recommend looking at the Electric Trailer Brake Kit - Self-Adjusting # AKEBRK-7-SA. These 12 inch assemblies are designed for 5,200 to 7,000 pound axles and feature a 5 bolt mounting flange bolt pattern. They are also self-adjusting so they will not require periodic manual adjustments like standard brakes. I have included a short video demonstration on this...
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  • Availability of 12 x 2 Inch Brake Assemblies with 3 Hole Mounting Pattern
    We do not have a 12 inch brake assembly available that features a 3 bolt mounting pattern like what you described in your question. In order to install standard 12 x 2 electric brake assemblies like the Brake Kit # AKEBRK-7-SA, which feature a 5 bolt mounting pattern, you will need to either replace the existing mounting flange on your axle or the entire axle itself. If you have a 3 inch diameter axle, you can use the Redline Brake Mounting Flange # 4-44-1. These feature...
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  • Brake Flange Availability of Trailer Spindle # TRU37FR
    Yes the brake flange of the # TRU37FR is available with the part # 4-44-1.
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  • Front Brakes for a Texas Bragg Trailer w/out Front Axle Brakes
    The Dexter Nev-R-Adjust Electric Trailer Brake Kit item # 23-458-459 are 12" in diameter x 2" wide. The mounting flanges have a 5-bolt pattern. They will fit 14.5" to 16" wheels. If your Texas Bragg Trailer has hubs and tires that match those dimensions then they will fit your trailer. Your biggest concern is that axle having a brake mounting flange like the Redline Brake Mounting Flange for 3" Round Axle item # 4-44-1. That axle may not have one if it doesn't have brakes. This isn't something...
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