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  3. Spring Seats
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  8. Utility Trailer
Spring Seat for Typical 5,200-lb to 7,200-lb, Round Trailer Axles with 3" Diameter

Spring Seat for Typical 5,200-lb to 7,200-lb, Round Trailer Axles with 3" Diameter

Item # TRSS300
Our Price: $9.37
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Trailer Leaf Spring Suspension
Shipping Weight: 0.68 lbs
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The spring seat is a necessary component of your trailer's suspension system. When mounted with 1-3/4" or 2" wide leaf springs, it adds extra support and provides proper positioning for the axle. Great Prices for the best trailer leaf spring suspension from TruRyde. Spring Seat for Typical 5,200-lb to 7,200-lb, Round Trailer Axles with 3" Diameter part number TRSS300 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (153)
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  • Videos (1)
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TruRyde Trailer Leaf Spring Suspension - TRSS300

  • Spring Seats
  • Boat Trailer
  • Camper
  • Car Hauler
  • Snowmobile Trailer
  • Utility Trailer
  • Round Axle - 3 Inch
  • TruRyde

The spring seat is a necessary component of your trailer's suspension system. When mounted with 1-3/4" or 2" wide leaf springs, it adds extra support and provides proper positioning for the axle.


  • Welds onto round, 3" diameter axle (typical 5,200-lb to 7,200-lb axle)
  • Works with 1-3/4" or 2" wide spring
    • Cutout on flat side of seat surrounds raised knob on leaf spring to prevent turning or shifting
  • Provides extra support and secure positioning for trailer axle
    • Please note: 2 spring seats are required for each axle


SS-300 TruRyde Spring Seat - 3" Round Axle

Replaces 3-42 Spring Seat - 3" Round Axle

Video of Spring Seat for Typical 5,200-lb to 7,200-lb, Round Trailer Axles with 3" Diameter

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

Video Transcript for TruRyde Trailer Suspension TRSS300 Review

Customer Satisfaction Score:

Customer Reviews

Spring Seat for Typical 5,200-lb to 7,200-lb, Round Trailer Axles with 3" Diameter - TRSS300

Average Customer Rating:  4.9 out of 5 stars   (153 Customer Reviews)

The spring seat is a necessary component of your trailer's suspension system. When mounted with 1-3/4" or 2" wide leaf springs, it adds extra support and provides proper positioning for the axle.


The axles that I ordered last year are still working out great. But even better than the parts was the service I got from etrailer. It was so great working with a company who took the time to listen to my project and help me get the right parts I needed, especially coming right off the heels of a terrible experience dealing with bad information and wrong parts from a competitor. Even with some damages in shipping, the returns/ and replacements were no hassle, with most issues being quickly resolved and not even costing me any additional downtime. As a contractor keeping a small fleet rolling, your competency and professionalism have made me a customer for life!! You guys at etrailer will be my first stop for trailer parts.


Received my parts today and after examining everything all looks good.
The quality of parts looks excellent and can't wait to start installing them.
Shipping was fast and arrived as they said.
Great company to buy with.
Will was very helpful and very knowledgeable about parts.
If you call would definitely ask for Will.


Not much to say, they are consistent and fit the axle tube well. Clean welding material.


Perfect fit, average quality.


Perfect fit as described! Uploaded picture for proof. So far i couldent be happier with, great prices and fast shiping. I haven't had an issue with anything so i have no opinion as far as customer service goes. I would definitely recommend to a friend.


Got what i was looking for and got great input from Customer Assistance.


The parts arrived quickly and were an exact fit, thank you!


Parts were Exactly what I ordered delivered fast will shop from this company again


Products were as advertised, worked well and installation went as planned. Accomplished task - moved under hung leaf springs to over axle (tandem drop) on older horse trailer, to regain bumper clearance - new truck sits higher than old, also allowed extended goose neck to eliminate tail gate damage, while leveling trailer (nose no longer stuck in air). I would purchase again without hesitation.

James K.


Works as expected, Im happy with the product and results- would purchase again if I have a trailer in the future that needs a lift.


Work great


I replaced my leaf springs, drums, brakes and added the Dexter E-Z Suspension kit to my Keystone Cougar Fifth Wheel trailer last year. This was my first time working with etrailer and I can’t say enough about how well it all went from the ordering to the install.
Tammie P did a amazing job with knowing what parts would work best on my trailer. Tammie also gave me updates on my deliveries that I appreciated. I had a trip planned short after I received my parts. So having someone at their end checking on arrival dates helped. In the future I will definitely use etrailer for all my trailer needs. Thanks again for all the help! Great Team....


I installed a set of these spring mount brackets one year ago and I am glad I purchased it from etrailer. I purchased it on line just to make sure it would work on the 1964 axle that I was going to weld it to in order to complete the install of a new set of springs that I also purchased from etrailer. Everything fit perfectly and etrailer is now my go to for all my trailer needs. George J. was very professional and knew the product(s) would work. And it did!

Thank you George and etrailer.


Worked well for the 6000# axle that I used this on. Fit the existing Lippert springs.


The seats were just what I needed Last year I moved the trailer
springs from the bottom of the axel to the top when I did I had
to turn the axel end to end it caused the trailer to wear tires out .
brakes to wear out .I am turning axel back and welding new seats
leaving hubs running right. Back to factory only on top of axel.

Thank You


Great product and great company to work with. I ordered regular shipping and they upgraded me to 3 day shipping an no charge. Very satisfied with the product and company.


I am using two second hand axles for my trailer and the spring seats were in the wrong place. They were hard to find because I didn't know what to call them, but I was really grateful they were available. They will complete the installation of the axles and are sturdy and cut perfectly.


Looks better in person, saved me some fab time on flipping my Obs Chevy


Product was exactly as described. Used the info on website for location of mounts. Couldnt be happier.
Awesome customer service as well.


I had ordered some parts online to rebuild the suspension on one of our trailers. Customer service called me a short time later to inform me that they were out of stock on some items, they asked if it was possible to substitute some items. She was able to find the exact parts I needed in a different kit. The parts came within 3 days, very well packed, and they fit perfectly! This is the 3rd time I've ordered from etrailer and they have exceeded my expectations every time. EXCELLENT customer service and quality parts.


Welded on great


Just what we needed for modification thank you for friendly helpful service


I recently started an new business and have purchased multiple products from over the last couple of months. I have been very happy with the ease of ordering and product quality. I initially ordered from several suppliers and have now starter ordering from only. They have the best pricing on the parts I purchase and am very happy with them!


Quick and easy, my favorite things


Although I just bought a rather small item, the service was great, the person I talked with was friendly & helpful, and was shipped on time. We welded the spring seat bracket on the day we got them!
I was very pleased, and will hopefully shop here again, and tell others about your website. Thanks!


what i needed for special project; narrow perch for 1935 dodge dropped axle. i needed something i could modify for my project. received quickly and im happy, thanks

Robert M.


part still working. very happy

Show More Reviews

See what our Experts say about this TruRyde Trailer Leaf Spring Suspension

  • How to Pick Out Spring Seats for an Axle that is Getting Moved Flipped
    To determine the correct spring seat will depend on the axle diameter and capacity. For example the Spring Seat part # TRSS300 that you referenced is designed for 3 inch axles with 5,200-7,000 lb capacities. If you need a different spring seat check out the link I attached that will show you all of the spring seats we offer.
    view full answer...
  • Can etrailer Weld Spring Seats To An Axle?
    All of our axles will come with spring seats already welded in place. We do not have the ability to weld any spring seats here at our shipping facility. We can provide a few loose spring seats # TRSS300. You would have to get the existing spring seats cut off, and have new ones welded on in the desired location.
    view full answer...
  • Leaf Spring Seats for a 5,200 to 7,000 Pound Trailer Axle
    A 5,200 to 7,000 pound trailer axle will be 3 inches in diameter if it is a round axle. For that you can use spring seat # TRSS300. It is sold in quantities of 1.
    view full answer...
  • Available 94-Inch Long Axles and Matching 3-Inch Diameter Spring Seats
    We do offer 7K-rated beam axles in the 94-inch hub-face-to-hub-face length you mention, shown on the linked page, and these have their spring seats spaced apart on center at either a 78-1/4-inch or 79-inch dimension. Since we do not produce these axles ourselves we cannot make one for you with different spacing but you can have a local trailer/welding shop install new spring seats at the specific 70-inch spacing you need. Our spring seat to fit this 3-inch axle diameter, part # TRSS300,...
    view full answer...
  • Can the Dexter Trailer Axle Beam Part # 8327830 Be Used with a Top Mounted Leaf Spring
    In order to use the Dexter Trailer Axle Beam part # 8327830 with leaf springs mounted on top you would need to weld on new spring seats with part # TRSS300. The reason for this is that the existing spring seats are installed for use with a leaf spring mounted under the axle. Most think you can simply rotate the axle to move the spring seats on top but this cannot be done as the axle has a slight bend to help dissipate the weight when loaded.
    view full answer...
  • Replacement 95 Long 7,000 lbs Dexter Axle w/ 4 Drop Spindles
    I just heard back from Dexter and they gave me some information on your axle. I have a solution for you and it is very close to your specifications but you will need to have the spring seats moved. The Dexter Trailer Axle Beam with 4" Drop E-Z Lube Spindles - 95" Long - 7,000 lbs item # 8327860 axle you were looking at is what Dexter recommended. There are no available axles with a 77" spring seat. These have a 79-1/4" spring seat and the replacements you will need are Item # TRSS300.
    view full answer...
  • Trailer Axle With 95" Hub Face, 4" Drop Spindle and 78" Spring Centers
    The Dexter Trailer Axle Beam with 4" Drop # 8327860 has the 95" hub face to hub face measurement that you are needing. You would need to remove the spring seats from the factory and add 2 new Seats # TRSS300 to the axle in the 78" center position you are needing. This particular axle is rated for 7,000lbs. If you are needing a different weight capacity please let me know.
    view full answer...
  • Availability of Dexter Axle # 8327816 with Spring Seats Welded On Other Side
    We don't offer them with the perches mounted on the other side but if you wanted to you could have a set of welded to the opposite side with # TRSS300 pretty easily.
    view full answer...
  • Replacing Lippert 5,200 lb Axle with Dexter 5,200 lb Axle 86.5 Inches Hub Face to Hub Face
    The Lippert 5,200 lb axle you have has a hub face to hub face of 86.5 inches which is identical to the Dexter # 8327816 you referenced, however the 68.5 inch spring seats of your Lippert axle are not identical to the 71.5 inch spring centers of the Dexter axle. They do use the same spindles so the bearings and grease seal will all match. You would simply need to weld spring seats onto the axle at the 68.5 inch on center locations using # TRSS300.
    view full answer...
  • Could Spring Seat of Dexter Axle be Moved to Fit New Application
    The Dexter axle part # 8327820 could only fit your trailer if you installed new spring seats on it since it has spring seat centers at 74 inches and your trailer has them at 71.5. For new spring seats you'd want the # TRSS300 welded at the correct distance. Aside from that the overall length and capacity would be fine for your trailer.
    view full answer...
    Image 1 for
  • Replacement for 7k Lippert Axle That is 95" Long With 80-1/2" Spring Center
    The Dexter Trailer Axle Beam with E-Z Lube Spindles # 8327834 will work as a replacement for your Lippert axle. The only thing that doesn't match up is the spring center measurement at 80". With only 1/4" difference on each side this shouldn't be a problem but it is better if it matches exactly. If you would rather make it 80-1/2" you could always cut off the spring seats and weld on # TRSS300 to match the Lippert.
    view full answer...
  • Does Dexter 6,000 Pound Axle Come with Spring Seats Welded on Top of Axle
    We do carry spring seats that can be welded on the top of the # 7461121 axle but it doesn't come that way. The spring seats are part # TRSS300.
    view full answer...
  • Can Axle Be Ordered with Loose Spring Seat Perches?
    The Dexter Trailer Axle Beam with E-Z Lube Spindles - 89" Long - 6,000 lbs # 8327830 comes with the spring seats (perches) welded in place and they cannot be ordered without them attached. However, you can add spring seats if you need them in a location other than the 74 inches on center. You would use the Spring Seat for Typical 5,200-lb to 7,200-lb, Round Trailer Axles with 3" Diameter # TRSS300 and you'd need to weld them in place and then prime and paint them for corrosion resistance....
    view full answer...
    Image 1 for Image 2 for
  • Replacement For 86-1/2 Inch Long 5,200 lb Axle
    Appreciate the photo, and what that shows is you have a 5,200 lb axle that is 86-1/2 inches hub face to hub face with a spring center to spring center measurement of 68-1/2 inches. We do have a replacement with that capacity and the correct length, but you'll have to have new spring seats welded on as we don't have one with the spring center measurement. So what you'll need is the following: - Dexter Trailer Axle Beam with E-Z Lube Spindles - 86-1/2" Long - 5,200 lbs # 8327816 - Spring...
    view full answer...
    Image 1 for
  • Spring Seat for Trailer Axle that is Getting Moved to Other Side of Leaf Springs
    You'll need to weld new spring seats on the opposite side of the axle so that you can move the axle to the other side of the leaf springs. So since I don't know what diameter axle you have you'd need to measure to be sure. The part # TRSS300 is for 3 inch diameter axles that are normally between 5,200 and 7,200 lb. Part # TRSS350 is for 3-1/2 inch diameter axles like what are 8k axles, # TRSS175 is for 1-3/4 inch 2,000 lb rated axle, and # TRSS238 is for 2-3/8 diameter 3,500 lb axles.
    view full answer...
  • Can Spring Seats On Trailer Axle Be Moved To Match Trailer Frame?
    They sure can! What you will need to do is replace the spring seats that are currently welded on the axle in question, and have a qualified welder weld them in the correct location to match your trailer. Now the correct spring seats will be dependent on the diameter of your axle tube. The most common sizes are the 1-3/4" # TRSS175 which is common for 2000lb axles, the 2-3/8" # TRSS238 which is common for 3500lb axles, or the 3" # TRSS300 which are common for 5200-7000lb axles. I included...
    view full answer...
  • How to Correct Trailer Whose Spring Hangers Do Not Line Up With Spring Seats
    You will need to have the spring seats removed to have them or new spring seats welded to your axle at the correct locations to match your trailer's hanger spacing. For a 3-inch round axle rated between 5200- and 7200-lbs use part # TRSS300; for a 2-3/8-inch diameter 3500-lb axle use part # TRSS238; for a 1-3/4-inch diameter 2000-lb round axle use part # TRSS175. If you cannot re-position the spring seats to match the hanger spacing then you can have a qualified welder install new material...
    view full answer...
  • What Are The Dimensions Of The Axle Spring Seat for 3 Inch Round Trailer Axles
    The Dimensions of the Axle Spring Seat 3 inch Round, item # TRSS300, are 1-7/8 inches wide by 4 inches long. The radius, where the 3 inch axle sits, is on center and the 1/2 inch hole is centered in the part.
    view full answer...
  • Can 5,200 lb Axles be Replaced With 7,000 lb Axles
    I appreciate the info, and while we can get you a higher capacity axle, a 7,000 lb axle can't replace a 5,200 lb axle because the hub-face to hub-face measurement on 7k axles is too long, coming in at 94 inches at the least. But what we can do instead is get you a 6,000 lb axle with the same hub-face to hub-face measurement that will also allow you to use the same hub and drum. You will simply need to have new spring seats welded on at your current 68-1/2 inch measurement; what you can...
    view full answer...
  • Replacement for 95 Inch Long 7,000 Pound Dexter Axle
    For a replacement axle I recommend the Dexter Trailer Axle Beam with 4" Drop E-Z Lube Spindles - 95" Long - 7,000 lbs # 8327860. I'm assuming by "4 inch" you meant a 4" drop since 7k axles have a diameter of 3". This axle will be the same as your current axle with the exception of the spring-center-to-spring-center length which is 79-1/4". The spring center measurement not matching up is fairly common but there is a solution. You will need to have the spring seats cut off of the axle...
    view full answer...
  • Dimension Of The TruRyde Spring Seat And Compatible U-Bolt Kit
    The Spring Seat for Typical 5,200-lb to 7,200-lb, Round Trailer Axles with 3" Diameter # TRSS300 measures 4" from end to end, and will work with a u-bolt kit, U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axle # APUBR-9. The U-bolts in this kit measure 3" wide, 7-1/4" long, and 9/16" in diameter.
    view full answer...
    Image 1 for
  • Axle Replacement for 6,000 lb Axle with 78.25 Inch Spring Seats
    You are measuring correctly for the spring seats and you definitely want to replace that axle as the spindle is toast. You will also want to measure for the hub face to hub face measurements. If you have 89 inch hub to hub, you can use the Dexter Trailer Axle Beam with E-Z Lube Spindles - 89" Long - 6,000 lbs # 8327830 but you will need to have the spring seat # TRSS300 welded in the correct locations. If you have 95 inch hub face to hub face, you can use the Dexter Trailer Axle Beam...
    view full answer...
    Image 1 for Image 2 for Image 3 for
  • Available 89-Inch Trailer Axles and Spring Seat Spacing
    All of our axles that have an 89-inch hub face spacing (see diagram, please) also have a spring center spacing of 74-inches. None of our axles has a 76-inch spring center spacing; the nearest ones are either 74 or 78-1/4-inches apart. But we can still help you with a new axle. You can refer to the linked page to see all of our axles. First select the weight rating of the axle you need. Our 89-inch axles such as # 8327830 are rated for up to 6K. Since you need spring seats in alternate...
    view full answer...
    Image 1 for
  • What is a Trailer Spring Seat
    A leaf spring seat, or perch as it sometimes called, is the mount that is welded to the axle where the trailer's leaf springs sit on top of or below the axle. An example of one is part # TRSS300. I've attached a picture that points out the spring seat on a trailer axle.
    view full answer...
    Image 1 for

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