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. Designed with competitive sailors and performance boats in mind, this compact 25mm block is engineered to achieve the highest possible strength-to-weight ratio.

Key Features:

• Single sheave ball bearing block with becket and lashing head featuring a 2-stage ball bearing system
• 1650 lb breaking load for reliable performance
• Accommodates lines up to 8mm (5/16") diameter
• Lashing head accepts up to 4mm (5/32") lashing line
• Constructed with acetal sheave and balls, toughened glass-fiber-reinforced nylon cheeks, and stainless steel hub
• Hollow hub design provides through-sheave becket functionality

Featuring Ronstan's renowned high-compression strength acetal bearing system, this lightweight yet durable block is ideal for control line systems such as mainsheet and spinnaker sheet turning blocks, cunninghams, and cascading vangs on dinghies up to 4 metres. The stainless steel hub provides versatile lashing attachments and through-sheave becket functionality, making it adaptable to a wide range of rigging setups.