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

Series 25 Ball Bearing Orbit Blocks: Delivering 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 25 mm (31/32") 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 ligjtweight 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 m (13').

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 4 mm (5/32") lashing and ensures maximum efficiency without compromising reliability.

Features:

• 2-stage ball bearing system
• Suits up to 8 mm (5/16") lines
• Hollow hub for becket take-off
• Lashing blocks suit up to 4 mm (5/32") lashing

Applications:

• Mainsheet and spinnaker sheet turning blocks on dinghies to 4 m (13')
• Control lines
• Cascading vangs
• Leech lines and cunninghams

Specifications:

• Block Type: Single
• Breaking Load: 550 kg (1212 lbs)
• Max Working Load: 250 kg (551 lbs)
• Max Rope diameter: 8 mm (5/16")
• Weight: 14 g (0.5 oz)
• Sheave Material: Acetal
• Materials:
  • Frame/Cheeks: Toughened, glass fibre reinforced nylon
  • Ball Bearing Sheave And Balls: High compression strength acetal

Note: Both the max working load and breaking load are dependent on the strength of line used to lash the block through the central hub. Knots, splices, stitching will generally have a lower breaking load than the line itself.