Flat Bottom U-Bolt, 3 1/4 x 5/8 x 10"

Flat Bottom U-Bolt — 3.25" × 5/8" × 10"

Square U-bolt for 3.25" axle tubes with 5/8" rod

This square (flat-bottom) U-bolt fits 3.25" diameter axle tubes and uses a 5/8" (.625") rod for high clamping strength. Threads are rolled for durability with 5" of thread length to accommodate plates and springs; trim excess after installation. Each U-bolt is Grade 8 and includes tall nuts and 1/4" thick washers for proper stack-up.

Use with U-bolt plates designed for 5/8" hardware; plates with smaller holes may need to be drilled to 5/8" for clearance. Verify plate width and spring pack height during mock-up to ensure sufficient thread engagement past the nut. After final torque, re-check clamp load after initial miles or trail use.

Key Features

• Part Number: R2548
• Axle diameter: 3.25"
• Rod diameter: 5/8" (.625")
• Leg length: 10"
• Thread length: 5" (rolled threads)
• Grade 8 hardware
• Includes tall nuts and 1/4" thick washers
• Square/flat-bottom profile
• Sold individually

Note

Ensure plates accept 5/8" U-bolts and that threads extend fully through the tall nut after torque. Cutting excess thread is acceptable once clamp load is verified; re-torque after the first shakedown.