Harken Zircon Block

Zircon blocks help trimmers match sail shapes to new conditions immediately. At the core of the Zircon performance are industrial ceramic ball bearings mounted inside caged races. The cages keep these bearings separated so they don't bunch, touch, and stop each other. The result is the most efficient small boat block Harken has ever made. Zircon blocks are available in 40 and 57 mm sheaves in single and double blocks, with or without beckets.

H2190 Specifications:

• Maximum Line Diameter: 8 mm (5/16")
• Sheave Diameter: 40 mm (1 9/16")
• Length: 60 mm (2 3/8")
• Weight: 22.9 g (0.81 oz)
• Maximum Working Load: 115 kg (250 lbs)
• Breaking Load: 340 kg (750 lbs)

H2191 Specifications:

• Maximum Line Diameter: 8 mm (5/16")
• Sheave Diameter: 40 mm (1 9/16")
• Length: 73 mm (2 7/8")
• Weight: 26.5 g (0.93 oz)
• Maximum Working Load: 115 kg (250 lbs)
• Breaking Load: 340 kg (750 lbs)

H2192 Specifications:

• Maximum Line Diameter: 8 mm (5/16")
• Sheave Diameter: 40 mm (1 9/16")
• Length: 60 mm (2 3/8")
• Weight: 44.7 g (1.58 oz)
• Maximum Working Load: 230 kg (500 lbs)
• Breaking Load: 680 kg (1500 lbs)

H2193 Specifications:

• Maximum Line Diameter: 8 mm (5/16")
• Sheave Diameter: 40 mm (1 9/16")
• Length: 73 mm (2 7/8")
• Weight: 47.6 g (1.68 oz)
• Maximum Working Load: 230 kg (500 lbs)
• Breaking Load: 680 kg (1500 lbs)

H2195 Specifications:

• Maximum Line Diameter: 10 mm (3/8")
• Sheave Diameter: 57 mm (2 1/4")
• Length: 79 mm (3 1/8")
• Weight: 44.8 g (1.58 oz)
• Maximum Working Load: 150 kg (330 lbs)
• Breaking Load: 450 kg (990 lbs)

H2196 Specifications:

• Maximum Line Diameter: 10 mm (3/8")
• Sheave Diameter: 57 mm (2 1/4")
• Length: 95 mm (3 3/4")
• Weight: 51.4 g (1.81 oz)
• Maximum Working Load: 150 kg (330 lbs)
• Breaking Load: 450 kg (990 lbs)

H2197 Specifications:

• Maximum Line Diameter: 10 mm (3/8")
• Sheave Diameter: 57 mm (2 1/4")
• Length: 79 mm (3 1/8")
• Weight: 86.4 g (3.05 oz)
• Maximum Working Load: 300 kg (660 lbs)
• Breaking Load: 900 kg (1980 lbs)

H2198 Specifications:

• Maximum Line Diameter: 10 mm (3/8")
• Sheave Diameter: 57 mm (2 1/4")
• Length: 95 mm (3 3/4")
• Weight: 92.7 g (3.27 oz)
• Maximum Working Load: 300 kg (660 lbs)
• Breaking Load: 900 kg (1980 lbs)