Ronstan RF28109 Series 25 Ball Bearing Orbit Block with Becket and Lashing Head

The Ronstan Series 25 Ball Bearing Orbit Block delivers superior strength, reduced weight, and exceptional performance for high-demand dinghy and small boat applications. This single sheave ball bearing block features a becket and lashing head with a 2-stage ball bearing system.

Key Features:

• Compact 25mm design engineered to achieve the highest possible strength-to-weight ratio
• Ronstan's renowned high compression strength acetal bearing system
• Acetal sheave and balls with toughened glass-fiber-reinforced nylon cheeks and stainless steel hub
• Suits up to 8mm (5/16") lines
• Accommodates up to 4mm (5/32") lashing
• 1650 lb breaking load capacity
• Stainless steel hub for versatile lashing attachments and through-sheave becket functionality

Ideal for control line systems such as mainsheet and spinnaker sheet turning blocks, cunninghams, and cascading vangs on dinghies up to 4 metres. The lightweight yet durable construction makes this block perfect for competitive sailors and performance boats where every gram matters.