How To Choose The Correct Leaf Spring U-Bolt Diameter Size On A Trailer Axle
Question:
do you have these in the 1/2 diameter ,y ubolts or 1/2 would 9/16 be better or to small in strength
asked by: Irvin R
Expert Reply:
You will want to choose the diameter size of U-Bolts you need by the axle type (round, square) and the axle diameter. The Redline 2 Inch Square Trailer U-Bolt, part # SP01-160, you have referenced is for a 2 inch square axle. It is a 9/16 inch diameter bolt.
The 9/16 inch diameter U-Bolts are used on 1-3/4 inch and 2 inch square axles, 2-1/2 inch round axles, 3 inch round axles, and 3-1/2 inch round axles. I am including a link to a page of the available 9/16 inch diameter U-Bolts.
The smaller 1/2 inch diameter U-Bolts are used on 1-1/2 inch square axles, 2-3/8 inch round axles, and 3 inch round axles. I am including a link to the page of the available 1/2 inch diameter U-Bolts.
You will also want to match up the correct U-Bolt plate with the U-Bolt width and diameter.
I am including a link to a FAQ page on trailer suspension that will have a section on U-Bolts and U-Bolt plates.

Product Page this Question was Asked From
2" Square Trailer U-Bolt (Qty 2)
- Trailer Suspension Parts
- U-Bolts
- Camper
- Car Hauler
- Utility Trailer
- 3500 lbs
- Square Axle - 2 Inch
- 9/16 Inch Diameter
- 5-3/4 Inch Long
- Redline
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: Roadmaster Comfort Ride Leaf Spring Suspension Kit w/ Shocks - Tandem 8K, 3-1/2" Axles
- Shop: 2" Square Trailer U-Bolt (Qty 2)
- Shop: Hydrastar Electric Over Hydraulic Actuator Kit for Disc Brakes - 1,600 psi
- Shop: Double Lip Seal for 3,700-lb Marine Hubs
- Shop: Grease Seal - Double Lip - Inner Diameter 1.68" - Outer Diameter: 2.33" - Qty 1
- Video: HydraStar Kit Installation - 2020 Jayco Seismic 5W Toy Hauler
- Shop: Brake Controller
- Shop: Kodiak Disc Brake Kit - 13" Hub/Rotor - 8 on 6-1/2 - Dacromet - 8,000-lb Dexter
- Q&A: Recommended Disc Brake Conversion Parts for a 5th Wheel Trailer w/ 8,000 lbs Axles
- Video: Timken Hi-Temp Red Grease for Disc and Drum Brakes Feature Review
- Q&A: Comparing Benefits of Greased Hubs vs Oil Bath Hubs
- Q&A: Wet Bolt Recommendation For the Roadmaster Comfort Ride Leaf Spring Suspension Kit
- Video: All You Need to Know About the Kodiak Synthetic Bearing Oil for Oil Bath Hubs
- Video: Feature Review Kodiak Synthetic Bearing Oil for Oil Bath Hubs
- Shop: Dexter Heavy-Duty Suspension Kit for Tandem-Axle Trailers - 1-3/4" Wide Double Eye Springs
- Search Results: weld on spindles
- Article: How to Accurately Measure Trailer Leaf Springs
- Video: Detailed Breakdown of the Curved Equalizer for 1-3/4" Wide Double-Eye Spring
- Video: Installation: Kodiak Disc Brake Kit on a 2021 Vanleigh Beacon Fifth Wheel
- Q&A: Are Trailer Leaf Spring Shackles Supposed to be Angled or Totally Straight
- Q&A: What is The Maximum Axle Spread the Comfort Ride Leaf Spring Suspension Kit RM-2580 Will Fit?
- Search Results: weld on spindle
- Search Results: galvanized equalizer
- Search Results: galvanized shackle
- Video: 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles Spec Review
- Q&A: What Bronze Bushings For 8k Roadmaster Comfort Ride Leaf Spring Suspension
- Search Results: hispec
- Search Results: 02475
- Article: Double-Eye Trailer Suspension System Review
- Q&A: Brake Flange that Can Fit to Square Axle that is 1.5 inches by 1.5 inches