Ronstan Series 50 All Purpose Block - Single Stand Up with Captive Lock Head

Series 50 All Purpose Block - Single Stand Up

Features:

• Exceptionally high working loads
• Low maintenance, long service life
• Self-lubricating Acetal polymer sheave ensures low friction and extreme durability
• Captive Lock universal head
• Slotted pin shackle eliminates fouled lines
• Mount with 2 x 5mm (3/6") fasteners (not supplied)

All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Captive Lock universal head can be fixed in either of two planes, or free to swivel as required. Quick adjusting cleat arms require no tools to adjust and fix securely in position. Becket pin is removable so line can be spliced prior to fitting.

Applications:

• Mainsheet and halyard applications, vang and spinnaker control lines on boats to 10m (33ft)
• S60 - on boats up to 12m (40ft)
• Typically used in direct 4:1 purchase systems such as mainsheets and boom vangs
• On larger boats they are used for fine-tune mainsheet tackles, outhauls, cunninghams, checkstays, genoa lead pullers and traveller controls.

Materials:

• Grade 316 stainless steel load strap
• Impact and UV resistant, fiber reinforced Nylon cheeks

The Ronstan Series 50 All Purpose Block (Part Number RF51140) is a versatile and durable solution designed for a variety of sailing applications. Featuring a self-lubricating Acetal polymer sheave running on polished stainless steel races, this block offers low friction and exceptional longevity, making it suitable for both dynamic and static loads. Its robust construction ensures reliable performance in demanding conditions, whether used for mainsheets, halyards, vang, or spinnaker control lines on boats up to 10 meters (33 feet). For slightly larger vessels up to 12 meters (40 feet), the Series 50 blocks continue to provide dependable operation, making them ideal for cruising and racing scenarios alike. The design emphasizes ease of use and flexibility, with a captive Lock universal head that can be fixed in two planes or allowed to swivel freely, providing adaptable line management. The quick-adjust cleat arms require no tools for operation, allowing for swift and secure adjustments, while the removable becket pin facilitates pre-splicing lines for professional and efficient rigging.

Constructed with high-quality materials, the Ronstan Series 50 block features a Grade 316 stainless steel load strap for strength and corrosion resistance, complemented by impact and UV-resistant fiber-reinforced nylon cheeks to withstand harsh marine environments. The slotted pin shackle prevents fouled lines, enhancing safety and reliability during operation. Mounting is straightforward with two 5mm (3/16 inch) fasteners (not supplied), providing a secure attachment point on your vessel. This all-purpose block is well-suited for use in direct 4:1 purchase systems such as mainsheets and boom vangs, and on larger boats, it serves as a fine-tuning component for mainsheet tackles, outhauls, cunninghams, checkstays, and traveler controls. Its design emphasizes low maintenance, long service life, and high working loads, making it a trusted choice for sailors seeking performance and durability in their deck hardware.

Features:

• Exceptionally high working loads for demanding sailing applications

• Low maintenance design ensures long service life

• Self-lubricating Acetal polymer sheave for low friction and durability

• Captive Lock universal head allows fixed or free swiveling operation

• Slotted pin shackle prevents fouled lines during use

• Mounting with two 5mm (3/16 inch) fasteners (not included) for easy installation