Ronstan Series 25 Ball Bearing HHL Lashing Orbit Block with Becket Hub

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 is a high-performance, lightweight control line block designed for demanding sailing applications. Featuring a compact 25mm size, this block offers exceptional strength-to-weight ratio, making it ideal for small boats and dinghies up to 13 feet long. Its robust construction includes a precision 2-stage ball bearing system that ensures smooth operation under high loads, while the stainless steel hub provides versatile lashing attachment points and through-sheave becket functionality for flexible rigging configurations. Whether used for mainsheet, spinnaker sheet turning, cunninghams, or cascading vangs, this orbit block delivers reliable performance and durability in a compact package.Designed with competitive sailors in mind, the Ronstan Series 25 HHL variant features a Grade 2205 stainless steel sheave and bearing race, combined with Grade 304 stainless steel ball bearings, providing extra strength for high-load applications. The becket hub accommodates up to 4mm (5/32 inch) lashing, allowing for secure attachment to various rigging setups. This high load (HHL) model is especially suitable for modern performance and foiling boats that utilize small-diameter lines to carry significant loads, ensuring precise control even in challenging conditions.The lightweight yet durable design weighs only about 1.2 ounces and includes a 1-inch diameter sheave capable of handling rope diameters up to 5/16 inch. This makes the Ronstan Series 25 Orbit Block a versatile component for racing dinghies and other small craft requiring efficient, reliable control line management. Crafted from toughened, glass fiber reinforced nylon, the frame and cheeks provide high resistance to wear and impact, while the stainless steel components guarantee longevity in the marine environment. Overall, this orbit block combines advanced engineering, materials, and thoughtful design to meet the needs of serious sailors seeking high performance and dependable rigging hardware.Ideal applications include mainsheet and spinnaker sheet turning blocks, control lines, cascading vangs, and leech lines on boats up to 13 feet. The Ronstan Series 25 HHL Orbit Block is engineered to enhance boat handling, reduce weight, and improve overall sailing performance, making it a smart choice for both competitive racing and high-demand recreational sailing.Materials used are high-grade stainless steel for the sheave and bearing race, combined with durable glass fiber reinforced nylon for the frame, ensuring resilience against harsh marine conditions. This combination of materials and innovative design makes the Ronstan Series 25 Orbit Block a trusted component for sailors who demand the best in rigging performance and reliability.

Features:

• 2-stage ball bearing system for smooth, reliable operation under high loads

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

• Hollow hub design allows for easy becket take-off and versatile lashing options

• Lashing blocks accommodate up to 4mm (5/32 inch) lashing for secure attachment