Ronstan RF20151A 20mm Cheek Pulley Block | Ball Bearing Block

The Ronstan RF20151A is a compact, high-performance 20mm cheek block designed for permanent mounting on spars, decks, or other flat surfaces. As part of the reliable Ronstan Series 20 range, it features a ball bearing acetal sheave for low-friction operation and 316 stainless steel cheeks for long-term durability in marine environments.

Ideal for dinghies, keelboats, and other small vessels, this ball bearing cheek block is perfect for cunninghams, outhauls, and control line guides. Designed to deliver smooth, controlled movement where space is limited and reliability is critical.

✅ Key Features

• Ronstan RF20151A – Series 20 cheek-mounted block

• 20mm ball bearing sheave for low friction

• Fixed cheek design for permanent surface mounting

• UV-resistant acetal construction

• 316 stainless steel cheeks for marine durability

• Ideal for control lines, outhauls, and cunningham systems

• Lightweight and compact for small boat rigging

• High-performance hardware for dinghy and keelboat sailing

Ronstan RF20151A Cheek ball bearing pulley block 20mm specifications:

• Sheave Ø 20mm
• Max. Rope Ø 6 mm
• M.W.L. 200 kg
• B. L. 550 kg
• Weight 17 g