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Trailer Brake Mounting Flange for 3-1/2" Axles, 12-1/4" Brake Assemblies

Trailer Brake Mounting Flange for 3-1/2" Axles, 12-1/4" Brake Assemblies

Item # 4-50
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Dexter Accessories and Parts - 4-50
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Dexter Accessories and Parts - 4-50

  • Trailer Brakes
  • Disc Brakes
  • Electric Drum Brakes
  • Hydraulic Drum Brakes
  • Brake Mounting Flange
  • Dexter
  • 12-1/4 Inch
  • 3-1/2 Inch Diameter Axle


Trailer Brake Mounting Flange for 3-1/2" Round Axles
  • Inside diameter: 3"
  • 4 mounting holes
  • Brake mount flange gets welded to the end of the axle to provide a secure mounting place for brake assemblies
  • Designed for use with 12.25" brake assemblies (8K axles).

Dimension

004-050-00 Trailer Brake Mounting Flange for 3-1/2" Axles, 12-1/4" Brake Assemblies





Video of Trailer Brake Mounting Flange for 3-1/2" Axles, 12-1/4" Brake Assemblies

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




Video Transcript for Dexter Axle Trailer Brakes 4-50 Review

Speaker 1: Today, we're going to take a look at the four bolt trailer brake mounting flange for eight thousand pound axles, with the three and a half inch diameter axles. Now, this brake mounting flange is for three and a half inch round axles, which are normally on the eight thousand pound axles. This brake mount flange is what'll get wielded to the end of your axle and it provides the secure mounting place for the brake assemblies that use a four bolt mounting pattern. This is designed for use with the 12 and a quarter inch brake assemblies. A few dimensions on this, if you notice at the very top it has a four point five o stamp or part number on it. What that means is it's a four on five inch bolt pattern and what they're measuring is the diagonal measurement.

So, from the center of this hole to the center of this hole is five inches.So, if we turn it and put the ruler on it, there's your five inch. So, four holes, five inch bolt pattern. The hole inside diameter, the large hole is right at three inches and it does have the four mounting holes and if we measure these with the part number up at the top, if we measure it across this way, center to center it's going to be right at three and seven-sixteenths of an inch and if we go up center to center it's going to be right at three and a five-eighths and the thickness on this part it's all steel, it is right at three-eighths inch thick but that should do it for the review on the four bolt trailer brake mounting flange for an eight thousand pound axles with the three and a half inch diameter axles.

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See what our Experts say about this Dexter Accessories and Parts

  • What is the Bolt Pattern for Brake Mounting Flange 4-50
    Brake mounting flange # 4-50 has a standard 4 bolt pattern for 8,000 pound brake axles. Diagonally the holes are spaced 5 inches apart on center. Side to side they are 3-7/16 inches apart on center. And top to bottom they are 3-5/8 inches apart on center. I included a picture showing these measurements for you. Basically the part number, 4-50, indicates a 4 on 5 bolt pattern.
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  • Can Surge Brakes be Added to Existing Axle?
    You would be able to add brakes to your axle, but it would require you to have a brake mounting flange behind each hub assembly, which you may not have with an axle without brakes. You would need to get the properly sized flange for your axle and have them welded on by a qualified welder; I've added a link to our page with each of our brake mounting flanges on them for you. I've also added a link to help articles on what you would need to add brakes to your trailer once your flanges are...
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  • 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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  • 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...
    view full answer...
  • Electric Brakes for Rockwell 8,000 lb Torsion Axles
    Electric brakes such as Electric Trailer Brake Kit # AKEBRK-8 do not fit specific axles. These are 8,000 lb rated brakes with a 4-bolt mounting flange pattern and are 12-1/4" diameter x 3-3/8" wide, so you would need that mounting bolt pattern and a hub and drum assembly that allows these brakes to fit. I've added a link to a video review of the brakes for you to take a look at.
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  • Brake Mounting Flange Available for 8,000 Pound, 3-1/2 Inch Axle.
    If you're looking for a brake mounting flange for an 8,000 pound axle, you can use the Dexter Axle Trailer Brake Mounting Flange for 3-1/2 Inch Axles, 12-1/4 Inch Brake Assemblies # 4-50. This brake mounting flange has 4 mounting holes and is designed to be welded to the end of the axle to provide a mounting location for brake assemblies. This mounting flange will work well with 12-1/4 inch brake assemblies and the Dexter Hub and Drum Assembly you referenced # 8-218-9. The inner diameter...
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  • Adding a Brake Mounting Flange to Axle That Had Brake Backing Plate Welded To Axle
    The Brake Mounting Flange for 3" Round Axle # 4-44-1 will allow you to weld on the brake flange to a 3" axle. This will be the correct pattern for your Dexter Electric Trailer Brake Kit # 23-105-106. There are also Brake Mounting Flange for 2-3/8" Round Axles # 4-35 and Trailer Brake Mounting Flange for 3-1/2" Axles # 4-50. These will use different brake assemblies due to having a different axle size.
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  • Availability of 4 Bolt Mounting Flange for Electric Brake Assemblies
    It sounds like you are looking for a brake mounting flange for your trailer axle. For 4 bolt mounting flanges, we have the following plates available: For 3-1/2 inch axles: # 4-50 For 3 inch axles: # DM52415 For 2-3/8 inch axles: # 4-35 For 2-3/4 inch axles: # DM60124 For 1-3/4 inch axles: # 4-34 Brake mount flanges will need to be welded to the end of your axle and will provide a secure mounting place for the brake assemblies. I recommend having a qualified welder perform the installation.
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  • Can Brake Mounting Flanges be Added to Trailer Axles
    You can add brake mounting flanges to axles based which you'd need to know the diameter of your axle to pick out the correct one. Part # 4-44-1 is for a 3 inch axle, part # 4-35 2-3/8 inch axles, and part # 4-50 is for 3-1/2 inch axles.
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  • Will the Dexter Disc Brake Kit K71-635-93 Fit a 8000 Pound AL-KO Axle?
    The Dexter E-Coat Disc Brake Kit # K71-635-93 is designed to fit an axle that uses an inner bearing # 25580 (1.75" inner diameter), and an outer bearing # 02475 (1.25" inner diameter). From what I could find out about the AL-KO 8k axles, these should match what you have. I wasn't able to find the bolt pattern for brakes that AL-KO typically comes with, however, so this will need to be verified. I had the caliper bracket measured and the following measurements will correspond to the picture...
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  • How to Upgrade to 8 on 6-1/2 Inch Wheels with a 8,000 Lb Axle
    In order to determine if a drum/hub with a 8 on 6-1/2" bolt pattern will work with the braking assemblies you have on your trailer now you will need to first determine the size of hub/drum you need which can be done by measuring your existing hub/drum (see photo). You would then want to know the inner bearing, outer bearing, and grease seal numbers. If the numbers are not visible then you will want to measure where each of them seat on the spindle with a digital caliper like part # 301-17068...
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  • Availability Of Brake Mounting Flange With 3" Inside Diameter
    We do have one brake flange that would work for your trailer that would allow you to use 12" brakes which is the Trailer Brake Mounting Flange # 4-50 which has an inside diameter of 3" and uses Dexter Electric Trailer Brake Kit - Self-Adjusting - 12" - Left Hand and Right Hand - 8K # K23-532-533-00. Keep in mind that brake mounting flanges need to be welded on by an axle shop as the flange needs to be perfectly square with the axle or you will have issues with the brakes wearing unevenly. I...
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  • Bolt Hole Spacing of Dexter Electric Brakes for 8,000 lb Axle
    The Dexter Electric Trailer Brake Kit # K23-532-533-00 is for 8,000 lb axles and has a 4-bolt pattern that is 3-7/16" across and 3-5/8" vertically. They would mount to a 4-bolt brake mounting flange such as Trailer Brake Mounting Flange # 4-50, which you can see in the accompanying photo. These brakes are self-adjusting and measure 12" diameter x 3-3/8" wide; they include the mounting bolts and hardware needed for installation. I have added a link to a video review of the brakes and flange...
    view full answer...
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  • What Replacement Brake Shoes and Magnets do I need for Electric Drum Brakes?
    I have some parts you need for your brakes. Unfortunately, all of our brake flanges fall under the pilot hole diameter of 4 inches. The largest one we have is 3" like the Trailer Brake Mounting Flange for 3-1/2" Axles, 12-1/4" Brake Assemblies # 4-50. This is a 4-bolt square pattern. As far as the shoes, I recommend using 2 of the Replacement Shoe and Lining Kit for Dexter 12" x 2" Electric Brake Assembly - 7,000-lb # DX28FR. For the magnets, the parts you need are the Replacement Trailer...
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  • Recommended Brake Flange, Brakes, And Hub And Drum For 8,000-lb Axle
    Typically, a 3-1/2 inch diameter axle like you said you have on your trailer is an 8,000-lb axle. The brake mounting flange on the axle that is designed for a 3-1/2 inch axle is part # 4-50. The flange mounting holes measure 3-3/8 inches between the left and right holes and 3-5/8 inches between the top and bottom holes. The hub and drum we offer that is designed for 8,000-lb axles is part # 8-285-11UC3. This includes the drum, bearings, races, seal, cap, and lug nuts. For electric...
    view full answer...
  • Availability of Electric Brake Drum Assembly for # 8-285-11 Dexter Trailer Hub and Drum
    The Dexter Trailer Hub & Drum Assembly, part # 8-285-11UC3, that you have referenced, is the # 8-285-11 hub and integrated drum with the bearings, races, seal, cap, and lug nuts for a Dexter 8,000-lb axle. The electric brake drum assembly that fits the 8-285 hub and integrated drum would be the Dexter Electric Brake Assembly-Left Hand, part # 23-434, for the left side and Dexter Electric Brake Assembly-Right Hand, part # 23-435. These brake assemblies are for use on 8,000-lb and 9,000-lb...
    view full answer...
  • Trailer Brakes for 12 Inch Hub and Drum
    The Electric Trailer Brake with Dust Shield - Self-Adjusting # AKEBRK-8R have an 8,000 lb capacity and measure 12-1/4 inches in diameter and 3-3/8 inches wide so that is the dimension your drum would need to be. These fit a 4-bolt mounting flange such as # 4-50 and would require Mounting Hardware # BRKH122508. If you have 12 inch drums there are options for that, the Electric Trailer Brake Assembly - Self-Adjusting # AKEBRK-7L-SA (Left) and # AKEBRK-7R-SA (Right) which are 12 inches in...
    view full answer...
  • Can Standard Lug Nuts be Used With the Taskmaster TA69VR?
    The Taskmaster Provider 215/75R17.5 Radial Tire w/ 17-1/2" Solid Center Wheel - Offset - 8 on 6-1/2 - LR H # TA69VR is designed to be used with and requires the use of flange nuts instead of the standard conical style lug nuts. Typically an 8,000 pound axle will use 5/8"-18 studs as the 1/2"-20 stud will usually denote a hub/drum that will be used on up to a 7,000 pound axle. With that being said, I recommend upgrading your hub/drum to go with this tire and wheel set-up. If you have brakes...
    view full answer...
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Info for this part was:

Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Installed by:
Jeff D
Employee Wilson B
Updated by:
Wilson B
Employee Hannah L
Updated by:
Hannah L

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