High-Performance Ball Bearing Single Block Pulley with Lockable Swivel & Becket

Engineered for professional marine rigging and demanding outdoor applications, the RiaYer Ball Bearing Single Block Pulley delivers unmatched smooth rolling efficiency and rapid line response. Available in 35mm and 50mm sheave sizes, this block is the ultimate upgrade for sailboat mainsheets, control lines, and heavy-duty shade sail tensioning.

Key Product Highlights:

• Advanced Low-Friction Mechanics: Unlike standard plain bearing pulleys, this block features high-strength polymer ball bearings. It converts sliding friction into rolling efficiency, ensuring your ropes glide smoothly without jamming, even under high dynamic loads.

• Marine-Grade 316 Stainless Steel Skeleton: The load-bearing axis, top D-shackle, and becket pin are forged entirely from marine-grade 316 stainless steel, offering maximum resistance against rust, saltwater, and harsh ocean environments.

• Ultra-Lightweight & Rugged Shell: The hollow-carved sideplates are injection-molded from UV-stabilized PA66 nylon with fiberglass reinforcement. This design achieves an incredible strength-to-weight ratio while preventing UV degradation.

• 360° Lockable Swivel Head: The top shackle rotates freely to prevent line twists, or it can be locked securely at a fixed angle (0° or 90°) using the integrated set screw for rigid, precise alignment.

• Integrated Anchor Becket: The built-in hollow bottom becket allows you to easily dead-end a rope, which is essential for building 2:1, 3:1, or 4:1 block and tackle mechanical advantage systems.

Specifications & Size Comparison:

Versatile Applications By Size:

Choose 35mm for:

• Sailboat boom vangs and small dinghy control lines.

• Kayak anchor trolley systems and marine rudder controls.

• Hammock suspensions and lightweight camping canopy tensioning.

Choose 50mm for:

• Sailboat mainsheets, halyards, and spinnaker systems.

• Heavy-duty tensioning for outdoor shade sails and patio awnings.

• Arborist rigging, rescue hauling systems, and workshop block-and-tackle.

Maintenance Tip for Peak Performance:

To ensure the longevity of the high-speed polymer bearings, simply flush the block with fresh water after exposure to saltwater, dirt, or marine debris.