Ronstan Series 25 Ball Bearing Orbit Block - Lashing [RF28109]
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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.
30-Day Returns & Fast Shipping
Most eligible items may be returned within 30 days of delivery. Items must be unused, uninstalled, and returned in their original condition with all original packaging, accessories, hardware, and components.
Returns caused by ordering the wrong item, incorrect vehicle or product fitment, incorrect size or quantity, accidental purchase, change of mind, or other customer error are subject to a minimum 20% restocking fee. Depending on the condition of the returned product, packaging, missing components, or other factors affecting resale value, the restocking fee may be increased up to a maximum of 50% of the product price. Customer-error returns may also be subject to return shipping costs.
Restocking fees do not apply when we verify that the wrong item was shipped by us or that the product arrived damaged or defective through no fault of the customer. Please contact 4Falcons before returning any item so we can provide return authorization and instructions.
Orders are processed and shipped as quickly as possible. Delivery dates are estimates and may be affected by carrier delays, weather, holidays, incorrect addresses, or other circumstances outside our control. Tracking information will be provided when available.
Please verify vehicle, RV, marine, or equipment compatibility before placing your order. Installed, used, modified, damaged, incomplete, or otherwise non-resalable products may receive a reduced refund or may not be eligible for return.
