Double Aluminum Block 504-25


Double sheave block with anodized aluminum cheeks. Works with 504-35, 504-75, 504-76 for a 4:1 purchase. Delrin(tm) sheaves ensure smooth operation and high safe working load. Swivel head may be locked in place to avoid twist. Sheave Dia. 2" (51mm), Thickness 1 21/32" (42mm), Width 2 1/8" (54mm), Length 5 1/16" (129mm), SWL 1750 lbs. (795kg), Weight 8.3oz. (235g), Max Line 7/16" (11mm)

Schaefer Marine, Inc. warrants its standard catalog products to be free from factory defects in material and workmanship for a period of ten (10) years from the date of purchase, unless otherwise stated in this catalog or any other Schaefer Marine catalog. * Furling, Tuff Luff, and Windlass products have shorter warranties and are shown per product.

We offer free shipping on orders over $100. All other orders are shipped via UPS. For orders outside of the U.S., contact our sales team for custom quote:

Fitting products to your boat is not one size fits all, feel free to reach out to our team for assistance at 508-995-9511 or