Ronstan Series 20 Ball Bearing Single Upright Lead Block, 20mm Sheave, 250kg MWL

Optimize your sailing rig's efficiency and responsiveness with the Ronstan Series 20 Ball Bearing Single Upright Lead Block. Engineered for dinghy and small keelboat sailors, this high-performance block provides the low-friction, precise feedback crucial for detecting subtle wind changes and sailing as efficiently as possible. Its low-profile design is ideal for routing halyards and sail controls cleanly and effectively, ensuring smooth operation under both static and dynamic loads. Upgrade your control systems today for superior performance.

Key Features:

• Precision 20mm Sheave: Handles up to 6mm (1/4") rope, ensuring smooth line guidance.
• Robust Load Capacity: Offers a Maximum Working Load (MWL) of 250kg (550lbs) and a Breaking Load (BL) of 550kg (1,210lbs) for reliable performance under pressure.
• Advanced Two-Stage Bearing System: Features UV-stabilized Acetal sheaves with stainless steel ball bearings for exceptional low-friction efficiency at moderate loads, transitioning to a sliding acetal bearing on a stainless steel race to manage high loads without distortion.
• Durable Construction: Built with Grade 316 stainless steel load housing and impact-resistant, UV-stabilized acetal sheaves for long-term reliability in harsh marine environments.
• Lightweight Design: Weighing just 18g (0.6oz), it adds minimal mass to your rigging, maintaining optimal performance.

Applications & Pairings:

• Typically used for halyards at the mast base.
• Excellent for running control lines under the deck or for any hand-held control lines where sensitivity and efficiency are paramount.