Ronstan Series 25 Ball Bearing HHL Lashing Orbit Block RF28109HL for High-Load Sailing Applications

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 engineered for demanding high-performance sailing and rigging systems. Its compact 25mm size makes it ideal for control lines such as mainsheet and spinnaker sheet turning blocks on dinghies up to 13 feet, providing exceptional strength-to-weight ratio and durability. Featuring a two-stage ball bearing system with high compression strength acetal bearings, this block ensures smooth operation and reliable performance under high loads. Its lightweight design, weighing approximately 1.2 ounces, minimizes weight aloft while maintaining robust handling capabilities. The stainless steel hub accommodates lashing attachments up to 5/32 inch, offering versatility for various rigging configurations. The inclusion of a becket hub allows for convenient through-sheave take-off, simplifying setup and adjustments. The HHL variant is equipped with a Grade 2205 stainless steel sheave and bearing race, paired with Grade 304 stainless steel ball bearings, making it suitable for high-load applications such as foiling and modern performance boats using small-diameter lines to carry significant loads. Built with toughened, glass fiber reinforced nylon frames, these blocks resist impact and wear, ensuring long-term durability even in harsh marine environments. Whether used for control lines, cascading vangs, or cunninghams, the Ronstan RF28109HL provides a reliable, lightweight, and high-strength solution for competitive sailing and performance-focused applications. Its compact size and advanced materials make it an excellent choice for sailors seeking efficiency and durability in their rigging components.

Features:

• Two-stage ball bearing system for smooth operation under load

• Suitable for lines up to 5/16 inch (8mm) diameter

• Hollow hub design allows for becket take-off

• Lashing blocks support up to 4mm (5/32 inch) lashing for versatile rigging