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What are the 3500 Lb Trailer Axle Specifications?

A 3500 lb trailer axle is a standard component for medium-duty hauling, designed to support a gross axle weight rating (GAWR) of exactly 3,500 pounds. These axles are commonly used for utility, boat, cargo, and RV trailers.

Key technical specifications include:

Construction and Dimensions

  • Beam Material: High-tensile 3-inch diameter steel tubing to resist bending under load.
  • Spindle Type: 1.75-inch diameter, often featuring grease zerk fittings for maintenance.
  • Hub Face Measurements: Customizable standard lengths ranging from 60 to 95 inches (typically 89 inches for standard setups).
  • Weight: Each axle assembly weighs approximately 50-60 pounds.

Hub and Bolt Patterns

  • Common patterns include 5 on 4.5 inches for lighter duties or 6 on 5.5 inches for more robust compatibility.
  • Hubs are available in easy-lube or traditional greaseable styles.

Suspension and Braking

  • Spring Integration: Often paired with 4-leaf double eye springs (25 1/4 inches x 1 3/4 inches) or 3-leaf slipper springs.
  • Variants: Available as idler axles (no brakes) or brake axles. Brake versions can accommodate 10-inch electric drums or 12-inch hydraulic discs.

These axles can be used in single-axle configurations for trailers up to 7,000 lbs GVWR or tandem setups for heavier loads.

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