Ronstan Series 40 Orbit BB Quad Block w/Swivel Shackle

The Ronstan Series 40 Orbit BB Quad Block with Swivel Shackle is a premium ball-bearing block system designed for demanding rigging, lifting, and load-transfer applications where reliability and load capacity are non-negotiable. Built for mechanics, fabricators, and off-road enthusiasts who need proven hardware for vehicle recovery systems, winch setups, and heavy-duty mechanical work, this block delivers class-leading performance in a compact footprint. Whether you're building a custom suspension pulley system, setting up a winch anchor point, or designing a mechanical advantage rig for vehicle recovery, the Series 40 Orbit Block provides the engineering foundation for professional-grade installations.

The quad block configuration features four-part mechanical advantage through precision ball-bearing internals that minimize friction and maximize efficiency under dynamic loads. The swivel shackle attachment point eliminates stress concentration at the connection junction, allowing the block to articulate naturally without binding or twisted-line loading—critical for winch recovery operations and pulley-based load distribution. Ronstan's proprietary Orbit design ensures both static and dynamic load ratings are among the highest available in this size category, meaning the block maintains performance integrity whether under constant tension or shock loads. The compact 3 x 2 x 4-inch form factor and 0.45 lbs weight make it ideal for integrated vehicle modification projects where space and unsprung weight are limiting factors.

This block is ideal for custom vehicle recovery rig builders, winch system installers, and mechanics designing mechanical advantage systems for off-road or heavy-duty applications. The swivel shackle design is especially beneficial in multi-axis load scenarios where the line angle changes during operation—common in vehicle extraction setups and adjustable rigging systems. Installation is straightforward: secure the shackle to your anchor point or winch fairlead with appropriate grade fasteners, then run your load line through the four sheaves. Verify that all ball-bearing races are clean and lightly lubricated before deployment, and always use load-rated carabiners, snatch blocks, or shackles compatible with the block's dynamic rating for maximum safety and service life.