Ronstan RF280 Series 29 29mm Single Block with Loop Top

The Ronstan RF280 is a lightweight, economical 29mm single block designed for control lines on sailboats and dinghies. This workhorse block features a loop top attachment that can be secured with a shackle, lashed to an eye strap, or spliced directly to a line.

Durable Construction:

• 316 stainless steel cheeks provide exceptional strength and superior corrosion resistance in harsh marine environments
• UV-stable acetal sheave ensures long-lasting performance and durability
• Standard bearing design offers reliable performance for light to moderate loads
• Riveted construction eliminates the need for regular maintenance—just rinse occasionally
• Hollow rivets allow mounting with screws, shackles, or lashing, and can serve as a becket for additional purchase

Specifications:

• Sheave diameter: 29mm (1-1/8")
• Recommended line size: 5/16" (8mm)
• Single sheave configuration
• Loop top attachment style

Ideal Applications:

• Cascade system boom vangs
• Halyard tuning systems on dinghies
• Twings and cunninghams
• Sheets and general control line systems

Part of Ronstan's trusted Series 29 utility block lineup, the RF280 delivers reliable performance for smaller control lines and rigging systems without the expense of high-end bearing technology.