Ronstan Series 25 Ball Bearing HHL Lashing Orbit Block RF28109HL for Small Boat Rigging

Series 25 Ball Bearing HHL Lashing Orbit Block

Single sheave ball bearing high load block with becket hub option 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 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 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.

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): 880


• Sheave diameter (in): 1


• B.L. (lb): 2650


• Weight (oz): 1.2

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.


• HHL Sheave and bearing race: Grade 2205 stainless steel with Grade 304 stainless steel ball bearings.

The Ronstan Series 25 Ball Bearing HHL Lashing Orbit Block RF28109HL is designed for high-performance boating applications, offering a combination of strength and lightweight construction. This compact 25mm high load block features a dual-stage ball bearing system that delivers smooth operation under demanding conditions, making it ideal for control line systems such as mainsheet and spinnaker sheet turning blocks, as well as cascading vangs and cunninghams on dinghies up to 13 feet. Constructed with toughened, glass fiber reinforced nylon for the frame and cheeks, the block ensures durability and resistance to harsh marine environments. Its stainless steel hub allows versatile lashing attachments up to 5/32 inch, along with a through-sheave becket, providing flexibility for various rigging setups. The HHL variant is equipped with Grade 2205 stainless steel sheave and bearing race, paired with Grade 304 stainless steel ball bearings, offering increased load capacity and resilience for modern performance and foiling boats utilizing small-diameter lines to carry significant loads. Weighing just 1.2 ounces, this lightweight yet robust block is engineered for sailors demanding the highest strength-to-weight ratio. Its features include a maximum line diameter of 5/16 inch, a breaking load of 2,650 pounds, and a maximum working load of 880 pounds, making it suitable for high-stress applications while maintaining maneuverability and reliability. Whether used on small racing dinghies or high-performance sailboats, the Ronstan Series 25 HHL Orbit Block provides exceptional performance, durability, and versatility to enhance your rigging system.

Features:
* Two-stage ball bearing system for smooth operation.
* Suitable for lines up to 5/16 inch in diameter.
* Hollow hub designed for becket take-off and lashings up to 5/32 inch.
* High load (HHL) variant with Grade 2205 stainless steel sheave and race for increased durability.
* Lightweight design weighing only 1.2 ounces for optimal performance.