• Ronstan Series 20 Double Ball Bearing Block with Shackle, 20mm Sheave
1 1
1 product view Open images for a closer look Compare photos with product details

Ronstan

Ronstan Series 20 Double Ball Bearing Block with Shackle, 20mm Sheave

Ronstan Series 20 Double Ball Bearing Block with Shackle, 20mm Sheave

SKUCT-103685

$33.71
$33.71
Sale Sold out
Shipping calculated at checkout.
Shipping rewards at $100 U.S. orders of $100 or more get free standard shipping, plus $10 off Expedited and Overnight.

Low stock

Use the Tug & Tow SKUInclude this SKU when you contact us about fit, availability, or reorders.
Delivery shown at checkoutShipping options, final costs, and delivery estimates appear before payment.
Check fit before orderingReview dimensions, part numbers, model details, and compatibility notes.
Confirm the details before checkoutFit can depend on your boat, RV, trailer, vehicle, or equipment. Contact us before ordering if compatibility is critical.Ask a product question

Product details

Review the details before ordering.

Optimize your sailing system's efficiency with the Ronstan Series 20 Double Ball Bearing Block with Shackle. Engineered for demanding marine applications, this lightweight block delivers superior performance and reliability, ensuring smooth operation for critical control lines. Its robust construction and versatile design make it an essential component for competitive dinghy and small keelboat sailing. Upgrade your rig today for enhanced control and responsiveness.

Key Benefits & Features:

  • Ultra-Low Friction Operation: Precision-molded Acetal sheaves run on high-performance stainless steel or Torlon® ball bearings, providing exceptional low-friction performance under static and dynamic loads.
  • High Load Capacity: Boasts a remarkable Maximum Working Load (MWL) of 350kg (770lbs) and a Breaking Load (BL) of 700kg (1,540lbs), ensuring durability and safety for rigorous use.
  • Durable Marine-Grade Construction: Features a Grade 316 stainless steel load strap and head fitting, UV-stabilized Acetal sheaves, and impact-resistant, fiber-reinforced Nylon cheeks for long-lasting performance in harsh marine environments.
  • Versatile Two-Way Shackle Head: The integrated shackle head can be fixed at 0° or 90°, allowing for flexible orientation and easy integration into various rigging setups.
  • Compact & Lightweight Design: Weighing only 42g (1.5oz), this block minimizes weight aloft without compromising strength or performance.

Specifications:

  • Sheave Diameter: 20mm (3/4 inch)
  • Maximum Rope Diameter: 6mm (1/4 inch)
  • Pin Diameter: 4mm (5/32 inch)
  • Weight: 42g (1.5oz)

Recommended Applications:

  • Dinghy control lines and vangs
  • Cunninghams and traveller controls
  • Spinnaker pole launching systems and barber haulers
  • Halyard and backstay tuning systems

Shipping & returns

Shipping methods, delivery estimates, and final costs appear at checkout before payment. Some bulky, supplier-shipped, or special-handling items may ship separately. See Shipping & Returns for return windows and eligibility.

Fit & compatibility

Review the product title, description, images, dimensions, part numbers, and manufacturer details before purchase. For fit-sensitive items, confirm compatibility with your boat, RV, trailer, vehicle, or equipment.

Need help choosing?

Send us the product link or SKU, plus details about your boat, RV, trailer, vehicle, or project. We will help you narrow down the right option when product fit is not obvious.

View full details