Schaefer Marine 504-05 Single Block 51mm Sheave Aluminum Cheeks Delrin Bearing

The Schaefer Marine 504-05 is a high-performance single block designed for sailboats and rigging applications where strength and smooth operation are essential. This 5 Series block features anodized aluminum cheeks for corrosion resistance and durability in harsh marine environments, combined with a Delrin™ plain bearing sheave that ensures reliable, low-friction performance.

Key Features:

• Anodized aluminum cheeks provide excellent strength-to-weight ratio and corrosion resistance
• Delrin™ plain bearing sheave delivers smooth operation with minimal maintenance
• Swivel head design with locking capability prevents line twist and allows fixed positioning when needed
• Compact design with 51mm (2") sheave diameter suitable for control lines and light-duty halyards
• High safe working load of 1,750 lbs (795 kg) for reliable performance

Specifications:

• Sheave Diameter: 2" (51mm)
• Thickness: 15/16" (24mm)
• Width: 2 1/8" (54mm)
• Length: 4 13/32" (112mm)
• Safe Working Load: 1,750 lbs (795 kg)
• Weight: 5 oz (142g)
• Maximum Line Size: 7/16" (11mm)

Ideal for mainsheet systems, jib sheets, halyards, and general deck rigging applications on cruising and racing sailboats.