45 mm Runner Block
Model #
24116394
Mfg #
3396
$329.99
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Harken 45 mm Runner Block
The Harken 45 mm Runner Block is a top choice for big boat performance racers and cruisers seeking lightweight, free-running power in their running backstay systems. Designed for offshore boats, this runner block helps adjust mast bend for different wind conditions, making it essential for mainsail control and performance optimization.
Key Features
- Integrated sideplate bails and recessed cotter key design prevent snagging on lifelines and rigging
- Torlon roller bearings housed in a center cage keep elements separated and parallel for smooth, low-friction operation
- Hard Lube-anodized sideplates and sheaves provide maximum UV protection and corrosion resistance
- Lightweight aluminum construction with 6061-T6 sideplates sculpted to minimize weight
- Thin-profile, deep-groove aluminum sheaves with radiused edges protect high-tech lines
- Three-way head design allows the shackle to lock in front or side positions or swivel freely
- Dissimilar metals isolated with plastic isolators to prevent corrosion
- Quick disassembly with a single hex wrench for easy maintenance and service
- Sheave diameter: 45 mm (1 3/4 inch)
- Maximum working load: 750 kg (1653 lbs) — 60% higher than equivalent ball bearing blocks
- Breaking load: 1500 kg (3306 lbs)
Black Magic Air blocks are built for demanding sailing environments where reliability and performance are paramount. This 45 mm runner block delivers the strength, durability, and smooth operation that offshore racers and cruisers demand.
Application
Running backstay systems on offshore boats
Ball Bearings
Torlon roller bearings
Breaking Strength
1500 kg
Length
71 mm
Material
Aluminum
Safe Working Load
750 kg
Type
Single Runner Block
Weight
82 g
Sheave Diameter
45 mm
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