2-1/8" x 6-1/2" Square Trailer Axle U-Bolt Kit - 1/2" Diameter with Nuts
Heavy-duty square axle U-bolt kit for securing trailer axles to leaf spring suspension plates. Designed for common trailer suspension service where the 2-1/8" inside width, 6-1/2" length, and 1/2" rod diameter match the existing hardware.
Key Measurements & Specs
| Specification | Detail |
|---|---|
| Part Number / SKU | 34143-KIT |
| Product Type | Square trailer axle U-bolt kit |
| Inside Width | 2-1/8" |
| Length | 6-1/2" |
| Rod Diameter | 1/2" |
| Material / Finish | Zinc-plated steel |
| Quantity Included | 1 kit with U-bolts and matching hex nuts |
Fitment / Application
| Category | Details |
|---|---|
| Trailer Type | Boat, utility, cargo, and other leaf-spring trailer applications |
| Primary Fit | Commonly used with 2" square tube trailer axles when measurements match |
| Spring Application | Used with standard U-bolt plates for 1-3/4" or 2" wide leaf springs |
| Fitment Method | Match inside width, length, rod diameter, axle tube size, spring plate holes, and thread size before ordering |
| Important Note | Verify before ordering. Trailer axle hardware must match the existing axle and suspension plate dimensions. |
Top Features
| Feature | Buyer Benefit |
|---|---|
| Square Axle Fit | Designed for mounting square trailer axles to leaf spring suspension plates. |
| 1/2" Diameter Rod | Provides the required hardware size for compatible suspension mounting plates. |
| 6-1/2" Length | Useful for replacement service where the original U-bolt length matches this kit. |
| Includes Hex Nuts | Supplies matching nuts for installation with compatible suspension plates. |
Overview
The 34143-KIT is a square trailer axle U-bolt kit used to secure square tube trailer axles to leaf spring suspension plates. It measures 2-1/8" inside width by 6-1/2" long with 1/2"-diameter threads and includes matching hex nuts. This kit is commonly used during trailer suspension repair, axle service, or new suspension assembly where the existing axle and plate dimensions match.
R&P Service Insight
U-bolts are critical suspension fasteners and should be matched by measurement, not by trailer type alone. Always compare the old hardware and spring plate before installing replacement U-bolts.
- Measure First: Confirm inside width, overall length, rod diameter, and thread size against the original hardware.
- Check the Plate: Make sure the spring plate holes are sized and spaced for 1/2" U-bolts.
- Replace as Hardware: Suspension U-bolts are commonly replaced during axle or spring service rather than reused after removal.
R&P Knowledge Hub
Compatibility: Fits compatible square trailer axle suspension setups where the 2-1/8" inside width, 6-1/2" length, 1/2" rod diameter, and spring plate hole spacing match.
Trailer / System Fit: Intended for leaf spring trailer suspension systems using square tube axles and standard axle mounting plates.
Installation Notes: Verify that the U-bolt clears the axle tube and passes cleanly through the suspension plate before tightening. Use proper torque practices for trailer suspension hardware.
Performance Insight: Correct U-bolt sizing helps maintain axle alignment and secure clamping force between the axle, leaf spring, and spring plate.
Brand & Fitment Note
Selling Brand: R&P Carriages
Application Reference: Trailer type references such as boat, utility, and cargo trailers describe common applications only. Fitment depends on matching the suspension measurements.
What This Means: This listing is for a square trailer axle U-bolt kit, not a guaranteed OEM-branded item unless specifically stated and verified.
Before Ordering: Verify axle tube size, inside width, length, rod diameter, thread size, spring width, suspension plate hole spacing, and included hardware before installation.
R&P Repair Insight
If a trailer axle has been removed, springs have been replaced, or the existing U-bolts show corrosion or thread damage, matching replacement U-bolts are an important part of a clean suspension repair.
- Axle Size Check: This kit is commonly used with 2" square tube axles, but the U-bolt inside width should still be measured before ordering.
- Length Check: Confirm that 6-1/2" provides enough thread engagement through the spring plate without bottoming out or leaving insufficient thread.
- Hardware Check: Inspect spring plates, leaf springs, and mounting surfaces for wear, deformation, or corrosion before reinstalling.
Features
Square Axle Mounting Hardware
Designed to secure square trailer axles to leaf spring suspension plates in compatible trailer suspension assemblies.
2-1/8" x 6-1/2" Size
Matches applications requiring a 2-1/8" inside width and 6-1/2" U-bolt length.
1/2" Diameter Threads
Works with compatible 1/2" spring plate holes and matching included hex nuts.
Zinc-Plated Steel
Zinc-plated construction helps resist corrosion in trailer, utility, and marine service environments.
Included Components
| Quantity | Item |
|---|---|
| 1 Kit | 2-1/8" x 6-1/2" square trailer axle U-bolts, 1/2" diameter |
| Included | Matching hex nuts for the U-bolts |
| Not Included | Leaf springs, axle seat, spring plate, tie plate, shackles, equalizers, or other suspension hardware unless shown or stated separately |
