General Parts

The 16 mm is Harken’s® smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses stainless steel balls in a captive grooved race and has a 250 lb (113 kg) maximum working load...

Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming. Sheave: 40 mm / 1 9/16 in...

Low-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of styles lets these blocks adapt to almost all control line applications. Sheave: 29 mm / 1 1/8 in Length:...

Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming. Sheave: 29 mm / 1 1/8...

The 384 traveler block features high-load composite bearings to handle wire and high-strength line. Use with the 382 Radial Traveler car and other Small Boat cars to configure a radial vang. Do not use as mainsheet traveler. ONE DESIGN...

Lightweight, low-friction wire blocks carry wire halyards and high-strength control lines on boats of all sizes Sheave: 1 1/2 in Weight: 3 oz Shackle pin: 1/4 in Maximum wire: 3 mm Maximum line: 3/16 in Maximum working load: 1500 lb Breaking load: 3000...

Lightweight, low-friction wire blocks carry wire halyards and high-strength control lines on boats of all sizes. Sheave: 1 in Weight: 1.25 oz Shackle pin: 3/16 in Maximum wire: 2 mm Maximum line: 5/32 in Maximum working load: 1000 lb Breaking load: 2000...

Lightweight, low-friction wire blocks carry wire halyards and high-strength control lines on boats of all sizes. Sheave: 1 1/2 in Weight: 2.75 oz Shackle pin: 1/4 in Maximum wire: 3 mm Maximum line: 3/16 in Maximum working load: 1500 lb Breaking load:...

The Ronstan wire block is small and compact. It is made from advanced fiber and polymer technology, making them ten times stronger than steel, yet more lightweight. Use for 420/FJ/V15 Jib Halyard Block  20mm Ball Bearing Lightweight High working...

Lightweight, low-friction wire blocks carry wire halyards and high-strength control lines on boats of all sizes. Sheave: 25 mm / 1 in Weight: 28 g / 1 oz Shackle pin: 5 mm / 3/16 in Maximum wire: 3/32 in / 2 mm Maximum line: 4 mm / 5/32 in Maximum...

Ronstan ball bearing Orbit Blocks boast the highest strength-to-weight ratio available. This is achieved through all-composite reinforced polymer materials and multiple attachment options. Their precision design provides the optimum number of ball...

Ronstan ball bearing Orbit Blocks boast the highest strength-to-weight ratio available. This is achieved through all-composite reinforced polymer materials and multiple attachment options. Their precision design provides the optimum number of ball...

Designed to work well as a primary lead block on dinghies and catamarans or for control lines on larger yachts, the Ronstan 30 mm ball bearing block range features sheaves running on Acetal ball bearings for high performance and low friction. The 2-stage...

Designed to work well as a primary lead block on dinghies and catamarans or for control lines on larger yachts, the Ronstan 30 mm ball bearing block range features sheaves running on Acetal ball bearings for high performance and low friction. The 2-stage...

Ronstan 20 mm ball bearing block with precision moulded Acetal sheaves running on stainless steel ball bearings provide high performance & low friction. This is a standard single loop top style block is ideal for dinghy control lines, dinghy vangs,...

Ronstan 20 mm ball bearing block with precision moulded Acetal sheaves running on stainless steel ball bearings provide high performance & low friction. This unique double in line block (two single blocks in one unit) is ideal for dinghy control...