Ronstan Series 40 All Purpose Block - Single - Loop Top

The Ronstan Series 40 All Purpose Block – Single – Loop Top is a versatile rigging solution engineered for professionals who demand reliability under dynamic and static loads. Whether you're working in maritime operations, tactical rescue scenarios, or equipment rigging applications, this single block delivers consistent performance where failure is not an option. The loop-top design enables quick attachment to anchor points, carabiners, or structural mounting systems without additional hardware.

At its core, the Series 40 block features self-lubricating Acetal polymer sheaves running on polished stainless steel races—a proven engineering approach that eliminates maintenance requirements while resisting corrosion and salt-spray degradation. This design allows the block to perform equally well under continuous dynamic loads and sustained static loads without compromise. The compact profile (3 x 1 x 4 inches) and minimal weight (0.1 lbs) make it suitable for load-bearing systems where weight efficiency matters, while the stainless steel races ensure smooth operation and extended service life in demanding environments.

Law enforcement tactical teams, military personnel, and professional riggers rely on Series 40 blocks for rope systems, rescue operations, and equipment deployment. The loop-top configuration integrates seamlessly with webbing harnesses, anchor systems, and carabiner-based setups common in high-angle rescue and load-handling applications. This block is ideal for systems requiring durability, minimal maintenance, and predictable performance across temperature extremes and wet conditions.