Schaefer Hinged Half-Moon Mast Base Block
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Schaefer Hinged Half-Moon Mast Base Block

Schaefer Hinged Half-Moon Mast Base Block

  • Capacity: Line: 3/8", Wire: 3/16", Safe Working Load: 3000 lbs
  • Dimensions: 4-5/8" L x 3/4" W x 3-3/16" H
  • Material: Stainless Steel, Machined Aluminum Sheave
  • Item #: 
    Model #: 
    Shipping Weight: 
    0.80 Lbs.
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    The Schaefer Hinged Half-Moon Mast Base Block provides a strong, smooth option for leading halyards and control lines to the cockpit.


    • Hinged base adjusts to variable halyard and control line angles
    • Works with wire or small diameter low-stretch line
    • Machined aluminum sheave runs on a smooth self-lubricating Nomex™ - Teflon™ bearing
    • Low profile design keeps control lines and halyards close to the deck
    • Heavy duty polished stainless steel cage
    • High-Strength/Low-Friction


    • Maximum Line Size: 3/8" (10mm)
    • Maximum Wire Size: 3/16" (5mm)
    • Safe Working Load: 3,000 lbs (1361kg)
    • Sheave Diameter: 2-3/8" (60mm)
    • Dimensions: 4-5/8" (118mm) L x 3/4" (19mm) W x 3-3/16" (97mm) H
    • Bearing Height: 1-7/16" (37mm)
    • Fastener Centers: 3-15/16" (84mm)
    • Required Fasteners: 4 x 1/4" (6mm) flat head
    • Weight: 14.5oz. (411g)
    WARNING: This product MAY expose you to chemicals, which are known to the State of California to cause cancer, birth defects and/or other reproductive harm. For more information go to

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