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Trailer U-Bolts & Tie Plates

Buying Guide · Match the Tube

Match U-bolts to your axle tube

  1. Tube shape and size: round 2-3/8" (3.5K) or 3" (5.2–7K), or square — the U-bolt's inner width must match.
  2. Length: old bolt end-to-end, or tube + spring stack + tie plate thickness.

U-bolts are one-time-use — they stretch to spec when torqued. Replacing springs? Replace the U-bolts with them. See the spring measuring guide.

📱 Not sure what you have? Text a photo to 517-225-1991 — greasy, worn, no label, doesn't matter. We match parts from photos all day.