At a Glance
- SKU: 34143-KIT
PRODUCT INFORMATION
Product Details
Trailer Suspension Hardware
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.
Part Number: 34143-KIT 2-1/8" Inside Width 1/2" Diameter with Nuts
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 |
Important Fitment Note: Verify all measurements before installation, including axle tube size, U-bolt inside width, U-bolt length, rod diameter, thread size, suspension plate hole spacing, spring width, and included components. Trailer model and trailer type alone are not enough to confirm fitment.
34143-KIT square trailer axle U-bolt kit, 2-1/8 inch x 6-1/2 inch U-bolt kit, 1/2 inch trailer U-bolts with nuts, square axle U-bolts, trailer suspension mounting hardware, leaf spring axle U-bolt kit, boat trailer U-bolt kit, utility trailer suspension U-bolts, cargo trailer axle U-bolts, zinc plated trailer U-bolts
Related Parts & Kits
Check fitment, measurements, and kit contents before ordering. Related parts may not be required for your repair.
Looking up part numbers in our catalog…
Your repair list1 item selected
Selected products are added together. Review the cart and verify kit contents to prevent duplicates. Prices and discounts are determined at checkout.
BEHIND THIS LISTING
PHOTOGRAPHY & RESEARCH
Ariah Granados
DIGITAL PRESENTATION & DEVELOPMENT
Ken Martin
ONLINE SALES & QUALITY ASSURANCE
Rayn Fisher
WE’RE HERE TO HELP
Not sure it fits?
Have your SKU or manufacturer part number, photos of the original part and mounting, and any critical measurements ready. Capacity, voltage, or bolt pattern can help too.
815-357-3292 · 270 E Jackson St · Seneca, IL 61360
CUSTOMER REVIEWS
Leave a Google review
Good people. Real trailer work.
Customer feedback summarized from Google and Yellow Pages. Dates are shown where available.
TRAILER PARTSGOOGLE
Ordered trailer repair parts repeatedly; praised fast service, careful packing, and accurate orders.
RV KEYSGOOGLE
Found the correct RV keys at a good price with free shipping; the keys worked as expected.
AXLE & LEAF SPRINGSGOOGLE
Needed an unusual axle and leaf-spring size; the team listened and helped him sort out the fit.
PARTS & SHIPPINGGOOGLE
Praised the OEM and aftermarket selection, discounts, quick shipping, and friendly parts staff.
CUSTOM AXLEGOOGLE
Got the axle he needed right away, set up with a custom spring perch.
WELDINGGOOGLE
Praised the polite staff and quality welding on a project.
GAS STRUTGOOGLE
Replacement struts brought a long-used door back to working order.
CUSTOM TRAILERGOOGLE
Had a trailer built to his needs at a fair price, then found parts for two other trailers in stock.
CUSTOMER SERVICEGOOGLE
Praised the customer service after working with R&P over several years.
GAS SHOCKGOOGLE
Found the gas shock he wanted at a good price with shipping included.
CARGO TIE-DOWNGOOGLE
Received swivel D-rings with backing plates and praised the price, correct order, and service.
PARTS DELIVERYGOOGLE
The right parts arrived the first time, with fast delivery and helpful staff.
PROJECT HELPYELLOW PAGES
Said project advice and prompt shipping helped finish a trailer project.
SHIPPINGYELLOW PAGES
Reported helpful service and fast shipment to Germany.
SUSPENSION KITYELLOW PAGES
Praised a suspension kit, fair pricing, and good parts.
TRAILER CORDYELLOW PAGES
Was pleased with a replacement trailer cord.
SERVICE & PARTSYELLOW PAGES
Noted dependable service and products across repeat visits.
AXLE INSTALLATIONYELLOW PAGES
Said the axle installation fit perfectly and thanked Josh and the crew.
HITCH REPLACEMENTYELLOW PAGES
Praised the crew’s professionalism during a difficult hitch replacement.
PRICE & SERVICEYELLOW PAGES
Liked the product, price, communication, and shipping.
LISTING INFORMATIONYELLOW PAGES
Said the product description explained what would work for the trailer.
PRODUCT & SHIPPINGYELLOW PAGES
Received the item as described with very fast shipping and plans to return.
COMMUNICATION & SHIPPINGYELLOW PAGES
Praised accurate description, quick shipping, and clear communication.
PRICE & PRODUCTYELLOW PAGES
Was happy with the product and its price.
SELLER EXPERIENCEYELLOW PAGES
Called it a pleasure doing business with R&P.
INSTALLATIONYELLOW PAGES
Was pleased with product quality, quick delivery, and an easy installation.
PRODUCTSYELLOW PAGES
Was enthusiastic about the products.
DURABILITYYELLOW PAGES
Was ready to install the product on every trailer they own.
REPEAT CUSTOMERYELLOW PAGES
Expected to buy again after a good experience.
INSTALLED PARTYELLOW PAGES
Reported that the newly installed parts were working perfectly.
REPEAT CUSTOMERYELLOW PAGES
Said things went well, as they had on previous visits.
COMMUNICATION & VALUEYELLOW PAGES
Praised clear communication and fair value.
TRANSACTIONYELLOW PAGES
Said the transaction went as expected.
PRICE & PACKAGINGYELLOW PAGES
Noted good value, careful packing, and fast shipping.
PROFESSIONAL SERVICEYELLOW PAGES
Found the team professional and easy to work with.
COMMUNICATION & SHIPPINGYELLOW PAGES
Praised fast shipping and good communication.
TEAMYELLOW PAGES
Shared appreciation for the owners and their company.
SHIPPINGYELLOW PAGES
Reported prompt shipping and said they would buy again.
CUSTOMER SERVICEYELLOW PAGES
Found R&P easy to deal with.
SERVICEYELLOW PAGES
Praised the people and the service.
FIT & SHIPPINGYELLOW PAGES
Reported a good fit, fair price, accurate listing, and quick shipping.
DELIVERYYELLOW PAGES
Received the order a day early and recommended the seller.
CUSTOM TRAILERYELLOW PAGES
Described a no-hassle, professional custom-trailer purchase.
TRAILER PURCHASEYELLOW PAGES
Praised a new trailer, custom additions, helpful staff, and clear pricing.
HUB COVERSYELLOW PAGES
Found the right hub covers quickly and got helpful maintenance advice.
AXLE HELPYELLOW PAGES
Said R&P helped their company get back on the road after an axle problem.
DUMP TRAILERYELLOW PAGES
Was happy with a dump-trailer purchase after comparing options.
BRAKES, DRUMS & SEALSYELLOW PAGES
Received clear help choosing brake assemblies and bearing seals, followed by fast shipping.
DUMP TRAILERYELLOW PAGES
Found a good deal on a 16-foot dump trailer and planned to return.
FRIENDLY SERVICEYELLOW PAGES
Thanked the staff for their patience and recommended the shop.
Showing 3 of 50
Need help with this part? Send photos, part numbers, and measurements. We’ll help you narrow it down.