45mm Aluminum Black Magic Air Block with Swivel Black Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep the line from twisting. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C. Specifications: Sheave Ø (mm): 45 mm Sheave Ø (in): 1-3/4 in Length (mm): 100 mm Length (in): 3-15/16 in Weight (g): 79 g Weight (oz): 2.79 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): 750 kg Maximum working load (lb): 1653 lb Breaking load (kg): 1500 kg Breaking load (lb): 3306 lb

57mm Aluminum Low Load Black Magic Block with Swivel Black Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep the line from twisting. Low-load blocks have red isolators. They use Torlon® rollers and 316 stainless steel shackles. Standard blocks have 17-4 PH stainless head posts. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.  Specifications: Sheave: 57mm/2-1/4in Length: 119mm/4-11/16in Weight: 154g/5.44oz Shackle Pin: 6mm/1/4in Maximum Line: 12mm / 7/16in Maximum Working Load: 7/16kg / 1655lbs Breaking Load: 1500kg / 3300lb

57mm Carbo Air Block with Swivel 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: 57mm / 2-1/4in Length: 110mm / 4-5/16in Weight: 87g / 3.1oz Shackle pin: 5mm / 3/16in Maximum line: 10mm / 3/8in Maximum working load: 359kg / 792lb Breaking load: 1079kg / 2380lb

29mm Carbo Air Block with Swivel 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: 29mm / 1-1/8in Length: 66mm / 2-5/8in Weight: 26g / .9oz Shackle pin: 4mm / 5/32in Maximum line: 8mm / 5/16in Maximum working load: 150kg / 330lb Breaking load: 454kg / 1000lb

29mm Triple Carbo Air Block with Swivel 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: 29mm / 1-1/8in. Length: 73mm / 2-7/8in. Weight: 74g / 2.6oz Shackle pin: 5mm / 3/16in Maximum line: 8mm / 5/16in Maximum working load: 449kg/ 990lb Breaking load: 907kg / 2000lb

40mm Carbo Air Block with Swivel 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: 40mm / 1-9/ 16in Length: 86mm / 3-3/8in Weight: 44g / 1.6oz Shackle pin: 4mm / 5/32in Maximum line: 10mm / 3/8in Maximum working load: 220kg / 485lb Breaking load: 735kg / 1620lb

75mm Carbo Air Block with Swivel 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: 75mm / 2-15/16in Length: 137mm / 5-3/8in Weight: 195g / 6.9oz Shackle pin: 6mm / 1/4in Maximum line: 14mm / 9/16in Maximum working load: 550kg / 1213lb Breaking load: 1650kg / 3638lb

40mm Carbo Air Fiddle Block with Swivel Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken® Black Magic® line, these small, compact blocks have very high working loads for safe, easy trimming. The 40 mm fiddle is an excellent choice for 3:1 and 4:1 tackles on dinghy vangs and mainsheets, as well as for controls such as cunninghams and internal boom outhauls on larger boats. Specifications: Sheave: 40mm / 1-9/16in Length: 115mm / 4-1/2in Weight: 51g / 1.8oz Shackle pin: 4mm / 5/32in Maximum line: 10mm / 3/8in Maximum working load: 220kg / 485lb Breaking load: 735kg / 1620lb

57mm Carbo Air Fiddle Block with Swivel & Becket 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: 57mm / 2-1/4in Length: 175mm / 6-7/8in Weight: 113g / 4oz Shackle pin: 5mm / 3/16in Maximum line: 10mm / 3/8in Maximum working load: 359kg / 792lb Breaking load: 1080kg / 2380lb

40mm Carbo Air Fiddle Block with Swivel & Becket Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken® Black Magic® line, these small, compact blocks have very high working loads for safe, easy trimming. The 40 mm fiddle is an excellent choice for 3:1 and 4:1 tackles on dinghy vangs and mainsheets, as well as for controls such as cunninghams and internal boom outhauls on larger boats. Specifications: Sheave: 40mm / 1-9/16in Length: 131mm / 5-1/8in Weight: 54g / 1.9oz Shackle pin: 4mm / 5/32in Maximum line: 10mm / 3/8in Maximum working load: 220kg / 485lb Breaking load: 735kg / 1620lb

45mm Single Element Block with Swivel Element blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust. Element’s design pairs the minimum amount of metal required to protect the sheave with a proven journal bearing. So size for size, Element is priced significantly lower, than our previously least expensive blocks. Sideplates are hardcoat-anodized to resist corrosion. A tough composite bearing sheave resists corrosion for a long service life. Specifications: Sheave: 45mm / 1-3/4in Length: 102mm / 4in Weight: 103g / 3.6oz Shackle pin: 6mm / 1/4in Maximum line: 12mm / 1/2in Maximum working load: 700kg / 1543lb Breaking load: 1400kg / 3086lb

45mm Single Element Block with Swivel & Becket Element blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust. Element’s design pairs the minimum amount of metal required to protect the sheave with a proven journal bearing. So size for size, Element is priced significantly lower, than our previously least expensive blocks. Sideplates are hardcoat-anodized to resist corrosion. A tough composite bearing sheave resists corrosion for a long service life. Specifications: Sheave: 45mm / 1-3/4in Length: 121mm / 4-3/4in Weight: 115g / 4oz Shackle pin: 6mm / 1/4in Maximum line: 12mm / 1/2in Maximum working load: 700kg / 1543lb Breaking load: 1400kg / 3086lb

45mm Double Element Block with Swivel Element blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust. Element’s design pairs the minimum amount of metal required to protect the sheave with a proven journal bearing. So size for size, Element is priced significantly lower, than our previously least expensive blocks. Sideplates are hardcoat-anodized to resist corrosion. A tough composite bearing sheave resists corrosion for a long service life. Specifications: Sheave: 45mm / 1-3/4in Length: 108mm / 4-1/4in Weight: 180g / 6.3oz Shackle pin: 6mm / 1/4in Maximum line: 12mm / 1/2in Maximum working load: 875kg / 1929lb Breaking load: 1750kg / 3858lb

45mm Double Element Block with Swivel & Becket Element blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust. Element’s design pairs the minimum amount of metal required to protect the sheave with a proven journal bearing. So size for size, Element is priced significantly lower, than our previously least expensive blocks. Sideplates are hardcoat-anodized to resist corrosion. A tough composite bearing sheave resists corrosion for a long service life. Specifications: Sheave: 45mm / 1-3/4in Length: 127mm / 5in Weight: 195g / 6.8oz Shackle pin: 6mm / 1/4in Maximum line: 12mm / 1/2in Maximum working load: 875kg / 1929lb Breaking load: 1750kg / 3858lb

45mm Triple Element Block with Swivel Element blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust. Element’s design pairs the minimum amount of metal required to protect the sheave with a proven journal bearing. So size for size, Element is priced significantly lower, than our previously least expensive blocks. Sideplates are hardcoat-anodized to resist corrosion. A tough composite bearing sheave resists corrosion for a long service life. Specifications: Sheave: 45mm / 1-3/4in Length: 108mm / 4-1/4in Weight: 265g / 9.3oz Shackle pin: 6mm / 1/4in Maximum line: 12mm / 1/2in Maximum working load: 1050kg / 2315lb Breaking load: 2100kg / 4630lb