Match the part number, measurements and connection points that apply to your trailer.
| Hub Face | Measure hub face to hub face. |
|---|---|
| Spring Center | Measure mounting centers and confirm perch configuration. |
| Capacity | Match the required axle rating. |
| Brakes | Confirm brake type and flange configuration. |
Replacement trailer suspension U-bolt assembly sized at 9/16" diameter, 3" width, and 8" length. Includes one U-bolt, two nuts, and two washers for one U-bolt installation point.
The R&P Carriages R91618 U-Bolt & Hardware assembly is a replacement trailer suspension U-bolt setup for applications that require a 9/16" diameter U-bolt with 3" width and 8" length. This listing is for one U-bolt assembly and includes the matching nuts and washers listed below.
U-bolts are critical suspension fasteners that clamp the axle and spring assembly together. Correct sizing is important because diameter, inside width, length, and spring plate fit all affect whether the hardware will install properly.
Compatibility: Use where a 9/16" diameter U-bolt with 3" width and 8" length matches the trailer suspension setup.
Vehicle / System Fit: Trailer suspension axle and spring mounting applications where the U-bolt dimensions and mounting points match.
Installation Notes: Verify axle tube size, spring plate hole spacing, U-bolt length, and required hardware before installation.
Performance Insight: Correctly matched U-bolts help secure the suspension clamping point. Incorrect width or length can prevent proper installation or leave the assembly improperly seated.
Selling Brand: R&P Carriages
Application Reference: This listing is for trailer suspension hardware and should be matched by measurement and application requirements.
What This Means: This listing is for an R&P Carriages U-bolt hardware assembly, not a guaranteed OEM-branded item unless specifically stated and verified.
Before Ordering: Verify U-bolt diameter, width, length, axle tube size, spring plate compatibility, and included components before installation.
U-bolts should be selected by exact measurements, not by appearance alone. A U-bolt that is too narrow, too short, or the wrong diameter may not clamp correctly or may not pass through the spring plate.
Includes one U-bolt with the matching nuts and washers listed in the included components section.
Designed for trailer suspension applications that require a 9/16" diameter U-bolt.
Listed dimensions are 3" width by 8" length for measurement-based fitment matching.
Comes with two nuts and two washers for one U-bolt installation point.
| Specification | Detail |
|---|---|
| Part Number | R91618 |
| Brand | R&P Carriages |
| Product Type | Trailer suspension U-bolt with nuts and washers |
| Application | Trailer suspension axle and spring mounting hardware |
| Material / Finish | Not specified |
| Key Measurement | 9/16" diameter x 3" width x 8" length |
| Fitment | Match to existing trailer U-bolt size, axle tube size, and spring plate spacing |
| Included Quantity | One U-bolt, two nuts, and two washers |
| Pair / Axle Kit | No. This listing is for one U-bolt assembly only. |
| Category | Details |
|---|---|
| Vehicle / System | Trailer suspension axle and spring mounting hardware |
| Primary Fit | Applications requiring a 9/16" diameter U-bolt with 3" width and 8" length |
| Secondary Fit | Trailer axle and spring plate setups where all measurements match |
| Notes | Confirm diameter, width, length, spring plate compatibility, and axle tube size before ordering. |
| Quantity | Item |
|---|---|
| 1 | U-bolt |
| 2 | Nuts |
| 2 | Washers |
Selected from R&P customer feedback for Trailer Axle / Running Gear products and related trailer service.
“Got me the axle I needed right away with custom spring perch setting.”
“Had a trailer made to my needs.ken was able to get it done and at a price that was very acceptable.i have bought parts there for 2 other trailers and always in stock”
“Quality work. Staff is polite. Great job welding a project for me. Didn't even want to charge me, so I bought them a case of Corona. They were ecstatic. I ever need a welding or like that R&P Carriages is #1 !!!!!”
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