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8,000 lbs Round Trailer Axles U-Bolt kit 3-1/2"X 7-3/4" Long X 9/16"-18 Thread


Regular price $46.89 USD

Care information

To ensure optimal performance and extend the service life of your new trailer components, please follow these care guidelines after purchase:

  • Before installation, check all parts for shipping damage or missing components. Do not install damaged parts.
  • Always use correct tools and torque settings. Improper installation can lead to premature wear or failure.
  • For bearings, suspensions, and brake components, apply high-quality trailer grease before first use if not pre-greased.
  • Some parts (like brake assemblies) require a short break-in period to achieve full performance. Follow manufacturer instructions for best results.
  • Recheck fasteners, grease levels, and moving components after 100 miles of towing, then at regular intervals.
  • After exposure to water, road salt, or mud, clean and dry parts thoroughly. Apply anti-rust treatment if needed.
  • If storing unused parts, keep them in a dry, sealed container away from moisture and direct sunlight.

Delivery and Shipping

Handling Time: Orders ship out within 1 business day after payment is received.

Shipping Methods: We use trusted carriers like UPS, FedEx, or USPS based on package size and destination.

Delivery Time: Estimated delivery within 2–6 business days (U.S. domestic orders).

Tracking: A tracking number will be provided once your order is dispatched.

Product Overview:

Keep your trailer's suspension secure and stable with this heavy duty U-bolt kit, engineered to support demanding towing applications. Made from raw steel with precision cut threads, these U-bolts deliver exceptional strength and durability to handle heavy trailer loads and resist deformation under stress. 

This complete kit covers one axle, making it easy to replace worn or damaged U-bolts during routine maintenance or suspension rebuilds. By securing the leaf spring assembly firmly to the axle housing, it helps improve suspension stability, ride quality, and overall towing safety. Ideal for utility trailers, equipment haulers, flatbeds, and other trailers that see regular use, this raw steel U-bolt kit is built for reliable performance and long service life when it matters most. 

What's include: 

4 raw steel U-bolts (#4200-1) 

2 tie plates (#4200-3) designed for 2" wide leaf springs

8 hex nuts (#4203-2) for a tight, reliable fit

Specifications: 

Axle size: 3-1/2" round axle (8,000lb)
Axle rating: Typical 8,000 lb axle
Spring width: 2" 
U-Bolt: 9/16" -18 x 3-1/2" x 7-3/4"

OEM Replacement:

Part numbers included for easy identification and ordering: APUBR-35, #4200-1, #4200-3, #4203-2, and #4203-4.

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