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

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

Part Number: TRSS300
In Stock
$11.90
Trailer Suspension Parts
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etrailer Installation
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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 suspension parts 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 etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (660)
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TruRyde Trailer Suspension Parts - TRSS300

Highlights

  • Fits 3" Round Axles (5,200-7,200 lbs): Sized right for common heavy-duty trailer axles.
  • 4" Long x 1-7/8" Wide Seat: Provides solid weld area for a stable axle mount.
  • Works with 1-3/4" or 2" Springs: Matches standard trailer spring widths for easy setup.
  • Cutout Locks to Spring Knob: Prevents the axle from twisting or shifting under load.
  • Weld-On Steel Construction: Creates a secure, permanent spring-to-axle connection.
  • Two Seats Needed per Axle: Ensures even support and proper leaf spring alignment.

Features to know about

Steady Support for Heavy Axles: Weld-On Spring Seat for 3" Round Tubes

When your axle doesn’t sit square or shifts under load, it can throw the whole suspension out of line. This spring seat welds onto a 3" diameter round axle—typical for 5,200-lb to 7,200-lb setups—to give the leaf spring a solid, repeatable mounting point. The cutout on the flat side locks around the raised knob on the spring to keep it from twisting or sliding, so the axle stays planted and tracks true.

Proper Fit for Common Leaf Spring Sizes: Works With 1-3/4" or 2" Wide Springs

Getting the right match between the axle and spring width makes a big difference in how your trailer rides. This seat is built to work with standard 1-3/4" or 2" wide leaf springs, giving you the flexibility to line everything up the way it should be whether you’re setting up a new axle or replacing worn perches.

Built to Handle Real-World Loads: Sized Right for 5,200-lb to 7,200-lb Axles

When you’re running heavier gear or covering long miles, the spring seat has to take the stress without deforming. This TruRyde seat is made to handle the demands of axles in the 5,200- to 7,200-lb range and measures 4" long by 1-7/8" wide. The centered 1/2" bolt hole keeps the alignment reliable, and the radius fits the axle perfectly for a clean weld and strong hold.

Simple, Secure Setup: Two Seats Per Axle for Proper Alignment

Each axle needs two spring seats—one for each side—to keep the leaf springs square and balanced. Weld them in place, bolt up your U-bolt kit, and you’ve got a solid foundation ready for thousands of miles of steady towing.

Specs

Compatibility

  • Axle capacity: Typical 5,200-lb to 7,200-lb axle
  • Axle type: Round trailer axles with 3" diameter
  • Compatible spring width: 1-3/4" or 2" wide leaf springs

Dimensions

  • Width: 1-7/8"
  • Length: 4"
  • Hole diameter: 1/2"
  • Radius: On center (for 3" diameter axle)

Technical diagram of TruRyde TRSS300 3-inch round trailer axle spring seat showing detailed measurements and dimensions for 5,200 to 7,200 lb axles

Construction and Mounting

  • Mounting type: Welds onto round axle
  • Cutout: Flat side of seat has cutout that surrounds raised knob on leaf spring to prevent turning or shifting
  • Function: Provides extra support and secure positioning for trailer axle

Quantity

  • Requirement: 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
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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:

Ratings & Reviews

4.8

660 reviews
Review sort icon
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.

by:

Good price and availability. Fast shipp ing



by:

Just what I needed. Good quality with fast shipping.

Lloyd profile picture

Lloyd

9/22/2015

Great. Does the job with no problems.



by:

I could not figure out how but, when I ordered axel it was set at 74” c to c mine needed to be 70” c to center. I may need 2 more axels if I do how can it be made 70” c to c .



by:

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.



by:

Just what I needed for my project and at a fair price! Shipping was fast.

Roger T. profile picture

Roger T.

9/10/2017

everything working as it should, good product!



by:

It goes down straight no tire wear.



by:

Fast shipping and great products. Only thing that would have been better was if it all would have been made in America.

Chris P. profile picture

Chris P.

7/9/2017

So far so good



by:

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



by:

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



by:

Just what I needed, thank you very much



by:

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.



by:

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.



by:

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....



by:

Worked perfectly. Easy to weld on



by:

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. profile picture

James K.

7/29/2021

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.



by:

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.



by:

fit as it should



by:

Shipping was fast and part was packaged with lots of care! 10/10 would absolutely buy again.



by:

I have no complaints about the product. Not having the equipment or space to do the installation myself, I paid to have the work done. Seems to fit up perfectly and accomplishes what I need. Thank you for helping me make the right decision when you heard of my needs



by:

On all points, website, customer service, product quality, and quick delivery etrailer is top drawer!



by:

Perfect fit as described! Uploaded picture for proof. So far i couldent be happier with etrailer.com, 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.



by:

Fit perfect, great quality.



by:

This is the second trailer I've used these for. They made it easy to convert to a spring over axle configuration.



by:

These saved my bacon as my trailer didn't match any axles you stock.



by:

The axle and spring seat are doing well after a year. Even with my shade-tree mechanic welding abilities and thousands of grueling miles thru some of the roughest highways in North America (namely West Virginia) both are holding up to the task.


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See what our Experts say about this TruRyde Trailer Suspension Parts

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    Image 1 for
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    view full answer...


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