Series 25 Ball Bearing Orbit Block - Becket Swivel Shackle

Single sheave ball bearing block with becket hub and swivel shackle head.

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 25mm blocks are engineered to achieve the highest possible strength-to-weight ratio. Featuring Ronstans 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 meters.

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


• M.W.L. (lb): 500


• Sheave diameter (in): 1


• B.L. (lb): 990


• Weight (oz): 0.6

Applications:

• Mainsheet and spinnaker sheet turning blocks on dinghies to 4m (13ft).


• Control lines.


• Cascading vangs.


• Leech lines cunninghams.

Materials:

• Frame/cheeks: Toughened, glass fibre reinforced nylon.


• BB Sheave and balls: high compression strength acetal.