Blocks - Upright

Ronstan Series 40 Upright Lead Block, All Purpose Single sheave all purpose upright lead block. Requires 2x 5mm (3/16") fasteners Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers...

Ronstan Series 40 Ball Bearing Upright Lead Block Single sheave upright lead block Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Precision moulded Acetal sheaves running on Acetal...

Ronstan Upright Lead Block, 22mm Nylatron Sheave Suitable for use with wire or rope The external tabs can be formed to fit the spar profile before fastening Lead blocks are a low profile solution for leading halyards or other rig sail controls back to...

Ronstan Series 50 All Purpose Upright Lead Block Single upright, Requires 2x 6mm (1/4") fasteners Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Ideal for high load applications. Wear...

Ronstan Series 75 Roller Bearing Block, Upright Lead, Single Single, upright lead The self-contained alloy sheave packages provide reliable, low-friction performance at high loads. The high axial loads are carried by Torlon® roller needle bearings,...

Ronstan Series 75 Roller Bearing Block, Pivoting Low lead, Single Single Pivoting Low Lead Block Maintains alignment with a variable line entry-angle. The self-contained alloy sheave packages provide reliable, low-friction performance at high loads...

Ronstan Upright Lead Block, 29mm Acetal Sheave Single upright, removable sheave   Typically used in dinghy spars for control lines   U.V. stabilised Acetal sheave. Grade 316 stainless steel load housing   Specifications B...

Ronstan Upright Lead Block, 19mm Acetal Sheave Single upright Typically used in dinghy spars for control lines U.V. stabilised Acetal sheave. Grade 316 stainless steel load housing   SPECIFICATIONS   B.L. (kg) 500 M...

Harken 38mm Double Upright Lead Big Bullet Block 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...

Harken 38mm Upright Lead Big Bullet Block 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...

Harken Upright Bullet Lead Block 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...

Harken Upright Bullet Lead Block for Wire 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...

This upright lead block from Ronstan is typically used for halyards at the mast base. Lead blocks are a low-profile solution for leading halyards or other rig sail controls back to cleats or jammers. Ideal for high load applications. Manufactured with...

This upright lead block with a 20mm sheave from Ronstan is typically used for halyards at the mast base. Lead blocks are a low-profile solution for leading halyards or other rig sail controls back to cleats or jammers. Ideal for high load applications...

This upright lead block from Ronstan is typically used for halyards at the mast base. Lead blocks are a low-profile solution for leading halyards or other rig sail controls back to cleats or jammers. Ideal for high load applications. Manufactured with...

Low-friction Micro blocks are compact and lightweight. They are ideal for sailboards, smaller dinghies, and lightly loaded control lines on boats of all sizes. Note: DO NOT use Harken equipment for human suspension unless product is specifically...

Master Mastbase Blocks are one piece CNC machined Black Hardkote-anodised aluminum alloy cheek to provide excellent strength and lightweight. Ball bearing system has Self-Lubricant Acetal ball bearing. All sheaves are machined Black Hardkote-anodized...