C.E. Smith 9/16"-18 x 3-1/2" Shackle Bolts

The C.E. Smith 9/16"-18 x 3-1/2" Shackle Bolts are engineered fastening solutions designed for heavy-duty trailer suspension and off-road recovery applications where secure eye spring attachment is critical. Sold as a matched pair, these shackle bolts feature a fluted shank design that prevents rotational movement within the bracket, eliminating the wear and loosening that plague standard fasteners under dynamic load cycles.

The 9/16" diameter with 18 threads-per-inch specification is optimized for use with heavy-duty 9/16" eye springs and spring hanger brackets common in marine trailers, utility trailers, and off-road recovery systems. The 3-1/2" length accommodates standard bracket widths while the fluted shank geometry locks the bolt firmly in place, preventing the micro-rotation that causes bracket fatigue cracks and fastener self-loosening. Each bolt ships with corresponding lock nuts to ensure a complete, load-rated assembly.

This product is essential for trailer technicians, off-road recovery operators, and boat owners who prioritize suspension reliability. Whether rebuilding aging trailer axle assemblies, upgrading to reinforced suspension, or maintaining equipment used in saltwater or extreme-terrain environments, these C.E. Smith fasteners deliver the anti-rotation performance that prevents catastrophic suspension failure. The pair format eliminates the guesswork of matching fasteners, ensuring symmetrical spring loading across the axle assembly.

C.E. Smith is recognized in the marine and trailer equipment industry for manufacturing fasteners and hardware engineered to withstand repetitive stress, moisture exposure, and impact loads. This shackle bolt design reflects decades of field feedback from professional trailers and recovery operations, making it the preferred choice for operators who demand long-term suspension integrity over cheaper alternatives.