Single sheave ball bearing high load block with becket hub option and lashing head
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
Product Specifications
Type of Block
Single
B.L. (kg)
1200
M.W.L. (kg)
400
Weight (g)
34
Notes:
Both the MWL & BL are dependent on the strength of line used to lash the block through the central hub. Knots, splices, stitching will generally have a lower BL than the line itself.
The 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 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.
The range also includes a High Load (HHL) variant – the RF28109HL – which is equipped with a Grade 2205 stainless steel sheave and bearing race, paired with Grade 304 stainless steel ball bearings. These HHL blocks are purpose-built for high-load applications and are increasingly in demand for modern performance and foiling boats using small-diameter lines to carry significant loads.
Technical Information
Applications
Mainsheet and spinnaker sheet turning blocks on dinghies to 4m (13ft). Control lines. Cascading vangs. Leech lines & cunninghams.
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