Ronstan RF50101 Series 50 Ball Bearing Block Single Loop Top

The Ronstan Series 50 Ball Bearing Block with single loop top delivers high-performance, low-friction operation for marine rigging applications. Featuring a 2-stage ball bearing system with Acetal bearings, this block provides consistent performance across the full load range, from light trimming to heavy-duty sheeting.

Key Features:

• 2-stage ball bearing system minimizes friction and maximizes efficiency
• High static and dynamic load capacity up to 1,100 lbs MWL
• Lightweight construction at just 3.4 oz
• Cheek cut-outs allow easy bearing maintenance without disassembly
• 2-inch sheave diameter accommodates rope up to 1/2 inch

Technical Specifications:

• Maximum Working Load: 1,100 lbs
• Breaking Load: 3,310 lbs
• Maximum Rope Diameter: 1/2 inch
• Sheave Diameter: 2 inches
• Weight: 3.4 oz

Construction:

• UV-stabilized Acetal sheave with Acetal ball bearings
• Marine-grade 316 stainless steel load strap and head fitting
• Impact and UV-resistant fiber-reinforced nylon cheeks

Ideal for dinghies, small sailboats, and light-duty control line applications where reliability and smooth operation are essential.