Dexter APUBR‑8 U‑Bolt Kit – For 3″ Round Axles 5,200‑7,000 lb Capacity

Secure your axle with confidence using the Dexter APUBR‑8 U‑Bolt Kit, a reliable mounting solution built for heavy‑duty trailer applications. Designed specifically for 3" round axles in the 5,200 to 7,000 lb range, this kit includes all necessary hardware to fasten your axle to leaf springs with durability and safety in mind.

Key Features:

• OEM Dexter Part #: APUBR‑8
  Built to Dexter’s specification for quality and fit. 

• Designed for 3″ Round Axles
  Ideal for axles rated between 5,200 and 7,000 lbs. 

• All-Inclusive Kit
  Comes with U‑bolts, plates, and nuts — everything needed for standard mounting. 

• Robust Steel Hardware
  Made with durable materials suitable for trailer applications and road conditions.

• Versatile Spring Compatibility
  Compatible with 1‑3/4″ or 2″ wide leaf springs. 

Specifications:

• Part Number: APUBR‑8

• Kit Type: U‑Bolt mounting kit

• Intended Axle Capacity Range: 5,200 lb to 7,000 lb 

• Axle Tube Diameter: 3″ (round)

• U‑Bolt Length: 7″ long legs (inside measurement) 

• U‑Bolt Rod Diameter: 1/2″‑20 threads 

• Includes:

  • 4 × U‑bolts (7″ long)

  • 2 × U‑bolt plates (for 1‑3/4″ or 2″ springs)

  • 8 × 1/2″‑20 hex nuts 

Application / Compatibility

The APUBR‑8 U‑Bolt Kit is well-suited for:

• Utility trailers

• Cargo / enclosed trailers

• Equipment / construction trailers

• RVs with 3″ round axles

• Trailers using 5,200 to 7,000 lb axles

• Vehicles needing standard U‑bolt mounting hardware for 1‑3/4″ or 2″ leaf springs

Ensure your axle tube is 3″ and your spring width is 1‑3/4″ or 2″ before ordering. Proper spring seats are required for safe mounting

Alternate Item Number 

4201-GD, 9100047, D40-APUBR-8-PB