![Harken 40mm Carbo Air Double Swivel Block [2638]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/1280x1280/products/28333/36806/79734XL__25368.1646197857.jpg?c=1 "Harken 40mm Carbo Air Double Swivel Block [2638]")
![Harken 40mm Carbo Air Double Swivel Block [2638]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/28333/36806/79734XL__25368.1646197857.jpg?c=1 "Harken 40mm Carbo Air Double Swivel Block [2638]")
40mm Carbo Air Double Swivel 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
- 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
Quick Guide (pdf)
![Harken 40mm Carbo Air Double Swivel Block w\/Becket [2639]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/28334/36807/79735XL__54037.1646197859.jpg?c=1 "Harken 40mm Carbo Air Double Swivel Block w\/Becket [2639]")
![Harken 40mm Carbo Air Triple Swivel Block w\/Becket [2641]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/28336/36809/79737XL__03015.1646197864.jpg?c=1 "Harken 40mm Carbo Air Triple Swivel Block w\/Becket [2641]")
![Harken 40mm Carbo Air Triple Swivel Block [2640]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/28335/36808/79736XL__26111.1646197861.jpg?c=1 "Harken 40mm Carbo Air Triple Swivel Block [2640]")