Description
The Ronstan 25 mm Orbit Block is a single sheave ball bearing block with lashing head. This block expands the popular Ronstan Orbit Series, which also includes 20mm, 30mm, and 40mm blocks. This 25mm size has been designed specifically for ILCA and similar sized dinghies and is ideal for high tech 4mm and 5mm control lines.
- 2-stage ball bearing system.
- Suits up to 8mm (5/16”) lines.
- Hollow hub for becket take-off.
- Max. Rope diameter (in) 5/16
- Sheave diameter (in) 1
- B.L. (lb) 1650
- Weight (oz) 0.5
Ronstan 25 mm Orbit Blocks
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 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 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.
Product Reviews
Shipping & Returns
Delivery Info: Enjoy Free Standard Shipping on most orders* to the Continental United States over $99. Our Standard Shipping method utilizes USPS, UPS, and FedEx to send packages near and far. Shipping rates for Oversize items, Freight items, Expedited services (where available), and rates to other destinations will be calculated at checkout. Boats and kayaks are excluded from all free shipping offers.
See our Shipping Page for more information and exceptions.
Returns Info: Your 100% satisfaction is our goal - we want you to love your sailing gear, but if something doesn't work out, we accept returns on most new, unused items*. Returns can be made within 366 days (1 year + 1 day) of your original order date. Exceptions include (and are not limited to) cut line, Rig Shop products, special order items, numbered sailors, and items used or worn sailing.
See our Returns Page for more information.
