Harken 40mm Double Block

Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable.

Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming.

Specifications

• Sheave Ø (mm): 40 mm
• Sheave Ø (in): 1 9/16 in
• Length (mm): 89 mm
• Length (in): 3 1/2 in
• Weight (g): 80 g
• Weight (oz): 2.8 oz
• Shackle pin Ø (mm): 5 mm
• Shackle pin Ø (in): 3/16 in
• Maximum line Ø (mm): 10 mm
• Maximum line Ø (in): 3/8 in
• Maximum working load (kg): 440 kg
• Maximum working load (lb): 970 lb
• Breaking load (kg): 1080 kg
• Breaking load (lb): 2380 lb