Harken 57mm 5-Sheave Block - Swivel Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have...

Harken 57mm Ratchet Block - Swivel, Red Sheave Carbo Ratchets allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing. Part Number Sheave...

Harken 57mm Ratchamatic Block - Swivel, Red Sheave The Carbo Ratchamatic® is a load-sensing ratchet block that rolls freely in both directions under low loads and automatically engages the ratchet...

Harken 57mm Delrin Sheave Self-contained sheaves are designed for sailors to use in custom applications. 2760 sheaves are Delrin® acetal resin with Delrin® ball bearings. They are scored for...

Harken 57mm Cruising ESP Sheave Self-contained sheaves are designed for sailors to use in custom applications. Use Cruising ESP sheaves to handle high static loads from halyards and reef lines...

Harken 57mm High-Load Sheave High-load sheaves are offered as replacement parts or for use in special applications. Their bearing system combines sideload-carrying balls with a PTFE composite...

Harken 57mm Block Swivel Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high...

Harken 57mm T2™ Soft-Attach Ratchamatic® Block - Red Sheave The patented T2 Ratchamatic is Harken’s newest block to feature the T2 line’s styling and soft-attachment system. The weight of this...

Harken 57mm Cheek Block Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high...