Schaefer Double Block
Best durable rigging hardware for sailors managing boats up to 28 feet.
A robust double block engineered for reliable line management in demanding sailing conditions. It provides the necessary mechanical advantage for complex rigging setups, ensuring smooth operation and durability in marine environments.
$183.99
at
Defender Marine
Who it's for
- Performance sailors needing reliable strength without adding excess weight
- Ocean cruisers demanding long-lasting gear in harsh saltwater conditions
- Racers requiring smooth, low-friction line movement for competitive edges
Who should skip it
- Casual boaters wanting low-maintenance equipment that requires minimal care
- Budget-conscious sailors preferring affordable composite or plastic alternatives
- Weight-sensitive racers prioritizing the lightest possible rigging components
Performance breakdown
Load Capacity
Engineered to handle significant tension for boats up to 28 feet.
Material Durability
Anodized aluminum construction resists corrosion in harsh marine environments.
Sheave Smoothness
Delrin sheaves ensure consistent, friction-free line movement under load.
Rigging Versatility
Integrates seamlessly into complex 4:1 purchase systems for better control.
Swivel Control
Lockable head feature effectively eliminates unwanted line twisting during operation.
Build Quality
Robust, professional-grade hardware built for long-term reliability on the water.
Key Specs
Sheave Diameter
51 mm
Thickness
42 mm
Max Line Diameter
11 mm
Length
129 mm
Width
54 mm
Safe Working Load
795 kg
Weight
0.235 kg
Model Number
504-25
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