51mm Blocks - Series 5

Schaefer Marine Series 5, 51mm Blocks offer small to medium sized cruising and racing yachts an extremely high strength/weight ratio resulting in a highly refined and reliable block. Their strength and styling has also made them popular for medium use on bigger yachts teaming up with Schaefer's larger Series Blocks.

Schaefer's versatile universal head design has a three way built in locking feature and accepts Schaefer universal adapters for custom mounting. With the choice of brilliant Stainless Steel or Hardcoat Anodized Aluminium cheeks with UV protected Delrin or Delrin Ball Bearing sheaves. 5 Series Blocks provide you with extreme durability and versatility.

• Aluminium cheeks and plain bearing sheaves (504 series)
• Stainless Steel cheeks and plain bearing sheaves (505 series)
• Aluminium cheeks and delrinâ„¢ ball bearing sheaves (506 series).

Mainsheet Systems, Halyard Leads, Genoa Leads: boats to 28' (8.5m)

Control Lines: boats to 36' (11m)

Common Specifications

Sheave Diameter: 2" (51mm) - Sheave Width: 9/16" (14mm)

Maximum Line Diameter: 7/16" (11mm)

Pin Diameter: 1/4" 6mm

SWL Aluminium / Stainless: 1750lbs (795kg) - SWL Ball Bearing: 1500lbs (680kg)