Lewmar 72mm Synchro Block - Single
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Lewmar 72mm Synchro Block - Single Product Description
Experience the pinnacle of performance on the water with the Lewmar 72mm Synchro Block Single. Designed for sailors who demand precision and reliability, this block transforms how you manage loads on your mainsail or other high-stress rigging. Its innovative engineering minimizes friction through a perfect blend of optimized sheave geometry, a Free-Spin bearing system, and a self-aligning head—delivering up to 40% greater efficiency compared to standard blocks. The result? Smoother rope handling, effortless power transfer from deck to sail, and significantly reduced wear on your lines, keeping your setup running flawlessly race after race or cruise after cruise.
Why Synchro Blocks Stand Out in Demanding Conditions
Sailors know that every second counts when trimming sails under load. The Synchro Block's components work in harmony with the rope's natural path, eliminating snags and binding. Whether you're fine-tuning your mainsheet on a J/24 or optimizing a traveler on a larger cruiser-racer, this 72mm single block handles 13mm lines with ease, supporting a robust working load limit that gives you confidence in rough seas. The black finish not only looks sleek against carbon or alloy masts but also resists fading from UV exposure.
Key Construction Advantages
- Stainless Steel Strap: Boosts overall durability and extends service life, even in saltwater environments where corrosion is a constant threat.
- Glass Fiber Reinforced Cheeks: Exceptionally stiff design keeps lines firmly in the sheave groove, preventing wedging that can halt operations mid-maneuver.
- Tool-Free Sliding Swivel: Innovative locking mechanism allows quick adjustments and secure mounting via the integrated swivel shackle—no tools needed for on-deck tweaks.
- Low-Friction Free-Spin Bearing: Ensures ultra-smooth rotation, reducing effort by up to 40% and preserving rope life over thousands of cycles.
Technical Specifications at a Glance
| Attribute | Details |
|---|---|
| Sheave Diameter | 72mm |
| Max Line Diameter | 13mm |
| Working Load Limit | 2420 lbs |
| Mounting | Swivel Shackle |
| Weight | 6.69 oz |
| Material | Glass Fiber Reinforced Cheeks with Stainless Strap |
Real-World Applications and Pro Tips
Ideal for mainsail systems, boom vangs, or cunninghams where smooth, high-load handling is essential. Pair it with Dyneema or polyester lines for optimal performance—the self-aligning head forgives slight misalignments common in dynamic sailing. For installation, simply slide the swivel into position and lock it down; no pins or fasteners required. Regular rinsing with fresh water after use keeps the bearings spinning freely, maximizing longevity.
Unlike basic blocks that bind under tension, this Synchro model anticipates rope movement, making it a favorite among regatta teams pushing for podium finishes. Its lightweight build shaves grams off your rig without sacrificing strength, helping maintain that competitive edge.
Frequently Asked Questions
What makes the Lewmar 72mm Synchro Block more efficient than standard blocks?
It combines optimized geometry, Free-Spin bearings, and a self-aligning head to cut friction by up to 40%, allowing smoother power transfer and less rope wear during high-load operations like mainsheet trimming.
Can this block handle 13mm lines reliably?
Yes, it's rated for up to 13mm lines with a 72mm sheave diameter, ensuring lines sit perfectly without slipping or overriding, even under the 2420 lbs working load limit.
Is the swivel shackle easy to install and adjust?
Absolutely—the tool-free sliding swivel locking mechanism lets you mount and reposition it quickly on deck, ideal for adapting to different rigging setups.
How do the glass fiber cheeks benefit my sailing setup?
Their stiff construction prevents lines from wedging into the block, reducing downtime and maintenance while enhancing safety during maneuvers.
What's the best way to maintain this Synchro Block?
Rinse with fresh water after saltwater exposure, inspect bearings periodically, and avoid sand or grit buildup to keep it performing at peak efficiency.
Does it include a cleat or ratchet?
No, it's a clean single block design without an integral cleat or ratchet, focusing purely on ultra-smooth line movement for systems needing free-running efficiency.
Is this block suitable for racing sailboats?
Yes, its lightweight 6.69 oz build, high WLL, and friction-reducing features make it perfect for competitive racing where every detail impacts speed and handling.
Upgrade your rigging with a block that doesn't just work—it excels. Sail smarter, not harder.
Lewmar's Synchro Blocks are engineered for speed, efficiency and superior handling. We use a combination of scientifically optimized block geometry, a Free-Spin bearing and self-aligning head to reduce friction and increase efficiency by up to 40 Percent, over budget blocks on mainsheet systems. Each component is perfectly synchronized with the movement of the rope, providing you with an easier, smoother transfer of power from deck to sail and less wear on your rope.
Lewmar 29927201BK Attributes
- Type: Single Block
- Number Of Pulley: 1
- Working Load Limit: 2420 Pound
- Line Diameter: 13 Millimeter
- Sheave Diameter: 72 Millimeter
- Cleat Type: No Integral Cleat
- Ratchet And Direction: Non Ratcheting Any Direction
- With Becket: No
- Color: Black
- Material: Glass Fiber Reinforced Cheek
- Mounting Type: Swivel Shackle Mount
Lewmar 29927201BK Features & Benefits
- Stainless Steel Strap For Improved Strength And Longer Service Life
- Stiff Glass Fiber Reinforced Cheeks To Prevent Lines From Wedging
- Innovative Design With Tool-Free Sliding Swivel Locking Mechanism
- Easy Maintenance
- Limited 3 Year Warranty
Lewmar 29927201BK Warranties
72mm Synchro Block - Single
Lewmar's Synchro Blocks are engineered for speed, efficiency, and superior handling. Using a combination of scientifically optimized block geometry, a Free-Spin bearing, and a self-aligning head to reduce friction and increase efficiency by up to 40%, over budget blocks on mainsheet systems.
Each component is perfectly synchronized with the movement of the rope, providing you with an easier, smoother transfer of power from deck to sail and less wear on your rope.
Features:
- Stainless steel strap for improved strength and longer service life
- Stiff glass fiber reinforced cheeks to prevent lines from wedging
- Innovative design with “tool-free” sliding swivel locking mechanism
Technical Specifications:
- Working Load Limit - 2420lb
- Weight - 6.69oz
- Maximum Line Size - .47" (12mm)
*Sold as an Individual
Frequently Asked Questions (FAQ) About Lewmar 72mm Synchro Block - Single
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Who is the DS18 Audio?
What is the type of the product?
What is the material of Lewmar 72mm Synchro Block - Single?
What is the mounting type of the product?
What's the color of Lewmar 72mm Synchro Block - Single?
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Lewmar 72mm Synchro Block - Single Technical Specifications
| Type: | |
|---|---|
| Vendor: |
Lewmar |
| Weight: |
0.55 lb |
Lewmar 72mm Synchro Block - Single User Reviews
Lewmar 72mm Synchro Block - Single Shipping & Return
| Shipping Weight: |
0.55 lb |
|---|---|
| Box Sizes: |
2.00 (h) x 2.00 (w) x 4.00 (l) |
| Cubic Feet: |
16.0 |
| Returnable: |
Yes |
| USPS First Class: |
Yes |
For detailed shipping policy please check our Shipping Policy and you can find our Return and Refund Policy here.