This is a Single Swivel Sailing Block with Bow Shackle (also known as a marine pulley block), featuring a 360-degree rotating head, a low-friction single sheave, and corrosion-resistant metal construction designed to eliminate line twists in sailboat rigging. which is a piece of marine hardware used on sailboats. This specific design matches heavy-duty, compact composite blocks featuring a lightweight body and high load capacity.
Materials & Build
Materials: T316 stainless steel and high-performance PA6.6 nylon cheeks for saltwater protection.
Swivel Shackle: The top stainless steel loop rotates 360 degrees to prevent lines and ropes from twisting during use.
Composite Body: The outer cheeks and sheave (the inner wheel) are made from high-density reinforced nylon, which minimizes weight while retaining impact resistance.
Swivel Head: Rotates fully or can lock at 0° or 90° depending on alignment needs.
High Load Capacity: Depending on the exact size (usually 35mm to 50mm), these compact blocks are rated for breaking loads ranging from 1,500 lbs to over 3,000 lbs.
Key Applications
Running Rigging: Adjusting sailboat sheets, halyards, and control lines.
Block and Tackle: Multiplying pulling force for heavy marine or industrial lifting.
Watercraft Utility: Setting up anchor trolleys or tie-down systems on kayaks and small boats.
To help you find the exact replacement or compatible hardware, could you tell us the diameter of the rope you plan to use or the maximum weight load it needs to handle?
Single Swivel Sailing Block with Bow Shackle.
Haifan Rigging supply a range of blocks and pulleys.They come with a variety of fittings for each end to suit your particular application.
To put in your order, just fill out our short inquiry form here, but please do ask us if you need anything custom-made.
If you wish to ask a question or need further advice, you are welcome to contact us.
We'll be happy to help.
We look forward to hearing from you!
