Schaefer Series 7 Stand Up Ball Bearing Swivel Block - 2-3/8" 60mm

The Schaefer Series 7 Stand Up Ball Bearing Swivel Block in 2-3/8" 60mm is a single-sheave block designed for sailors, cruisers, and serious recreational boaters who demand reliable rigging hardware. Whether you're tuning mainsails, managing jib sheets, or setting up complex deck systems, this swivel block accommodates dynamic load transfers while maintaining directional control in changeable conditions. Built for both performance cruising and casual daysailing, it solves the problem of fixed-block friction and rope chafe by allowing lines to rotate freely without twisting.

What sets this block apart is its stand-up spring mechanism—a feature that keeps the block upright when lines go slack, eliminating the frustration of searching for loose hardware on a pitching deck. The Delrin ball bearing sheave rolls smoothly under load, reducing friction losses that slow sail trim adjustments. A stainless steel base spreads loads across a wider footprint, protecting deck surfaces and extending the life of backing plates. For reinforced deck mounting, the block accepts the optional 97-49 backing plate (sold separately), allowing you to secure it to cored or lightweight deck substrates where distributed load is critical.

Cruisers upgrading tired tackle, racers fine-tuning control systems, and fleet boat managers will find immediate value in Schaefer's robust engineering. The compact 2-3/8" sheave diameter suits modern low-friction sailplans without oversizing deck layouts, while the sealed ball bearing design resists saltwater corrosion when maintained. Installation is straightforward—mount via the stainless steel base using through-bolts or the optional backing plate for maximum durability in high-use applications like halyard systems, outhaul blocks, or traveler cars.