Ronstan RF45101 40mm Single Pulley Block | Series 40 Ball Bearing Block

The Ronstan RF45101 Single Block is a durable and compact 40mm pulley block from the Ronstan Series 40, built for medium-load rigging systems on dinghies, keelboats, and small yachts. With a UV-resistant acetal sheave and a ball bearing system, it ensures smooth, low-friction line handling under load.

Perfect for vangs, outhauls, cunninghams, and control lines, this single block is engineered for reliable performance and long-lasting durability in harsh marine environments. It’s a popular choice for sailors seeking efficient, compact rigging solutions.

✅ Key Features

• • Ronstan RF45101 – 40mm single ball bearing block

  • UV-stable acetal sheave for smooth, low-friction performance

  • Compact and lightweight design

  • Ideal for vang, outhaul, and control line systems

  • Suitable for dinghies, keelboats, and small yachts

  • Medium-load rated – part of the Ronstan Series 40

  • Built for efficient and durable rigging performance

Ronstan RF45101 40mm Single Pulley Block specifications:

• Sheave Ø 40 mm
• Max. Rope Ø 9 mm
• Max. Cable Ø - mm
• Pin Ø - mm
• M.W.L. 325 kg
• B. L. 700 kg
• Weight 33 g