• Ronstan Series 25 Ball Bearing Orbit Block™ - Lashing
1 1
1 product view Open images for a closer look Compare photos with product details

Ronstan

Ronstan RF28109 Series 25 Ball Bearing Orbit Block, Lashing, 1" Sheave

Ronstan RF28109 Series 25 Ball Bearing Orbit Block, Lashing, 1" Sheave

SKUCT-116819

$16.35
$16.35
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.

Elevate your dinghy and small boat performance with the Ronstan RF28109 Series 25 Ball Bearing Orbit Block™. Engineered for competitive sailors and high-demand applications, this lashing block delivers superior strength, reduced weight, and exceptional performance. Its innovative 2-stage ball bearing system ensures ultra-smooth operation and efficient line handling, making it an indispensable component for optimizing your control line systems. Optimize your rigging today.

Key Features:
  • 1" (25mm) Sheave Diameter: Optimized for lines up to 5/16" (8mm), ensuring compatibility with common sailing ropes.
  • Impressive 1650 lb (750 kg) Breaking Load: Provides robust strength for critical applications, enhancing safety and reliability.
  • Ultra-lightweight 0.5 oz (15g) Design: Reduces overall rigging weight, contributing to increased boat speed and agility.
  • Advanced 2-Stage Ball Bearing System: Delivers ultra-smooth, low-friction operation for effortless line handling.
  • Lashing Head with 4mm (5/32") Capacity: Offers secure and low-profile attachment options for versatile rigging.
  • Durable Construction: Features a high-compression strength acetal bearing system, toughened glass-fiber-reinforced nylon frame, and a stainless steel hub for marine-grade resilience.
  • Integrated Hollow Hub: Provides convenient becket take-off functionality for flexible control line setups.
Recommended For:
  • Mainsheet and spinnaker sheet turning blocks on dinghies up to 4 meters (13 ft).
  • Control line systems, cascading vangs, leech lines, and cunninghams.

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