Series 25 Ball Bearing Orbit Block - Lashing

Series 25 Ball Bearing Orbit Block - Lashing Single sheave ball bearing block with becket and lashing head. The Series 25 Ball Bearing Orbit Blocks deliver superior strength, reduced weight, and exceptional performance for high-demand dinghy and small boat applications. Designed with competitive sailors and performance boats in mind, these compact 25mm blocks are engineered to achieve the highest possible strength-to-weight ratio. Featuring Ronstan's renowned high-compression strength acetal bearing system, the Series 25 BB Orbit Blocks are a lightweight yet durable solution, ideal for control line systems such as mainsheet and spinnaker sheet turning blocks, cunninghams, and cascading vangs on dinghies up to 4 metres. Each block has a stainless steel hub for versatile lashing attachments and through-sheave becket functionality, making them adaptable to a wide range of rigging setups. The hub accommodates up to 4mm (5/32") lashing and ensures maximum efficiency without compromising reliability. Features: 2-stage ball bearing system. Suits up to 8mm (5/16') lines. Hollow hub for becket take-off. Lashing blocks suit up to 4mm (5/32') lashing. Specifications: Max. Rope diameter (in): 5/16 Sheave diameter (in): 1 B.L. (lb): 1650 Weight (oz): 0.5 Applications: Mainsheet and spinnaker sheet turning blocks on dinghies to 4m (13ft). Control lines. Cascading vangs. Leech lines & cunninghams. Materials: BB Sheave and balls: High compression strength acetal. Frame/cheeks: Toughened, glass-fiber-reinforced nylon.