The Harken 40mm Twing Block is a low-friction, lightweight Carbo Air block designed for reliable performance on dinghies, sport boats, and small keelboats. These compact blocks provide high working loads for efficient trimming and are suitable for spinnaker sheet, guy control, and code zero up-down control applications.
Key Features- Opening side plate for easy rigging and sheet removal
- Spring-biased latch allows for one-handed operation
- Integrated roller at the pivot base supports 1:1 or 2:1 up-down control
- Carbo Air construction offers high strength-to-weight ratio
- Sheave Diameter: 40 mm (1-9/16 in.)
- Length: 89 mm (3-1/2 in.)
- Weight: 86 g (3 oz.)
- Maximum Line Diameter: 12 mm (3/8 in.)
- Maximum Working Load: 275 kg (606 lb.)
- Breaking Load: 825 kg (1818 lb.)
- Manufacturer Part Number: 2699
Product facts
- CT SKU
- CT-116103
- UPC / GTIN
- 097653296966
- Package weight
- 0.22 lb
Fit-sensitive item: confirm measurements, model numbers, and manufacturer details before ordering. Tug & Tow does not guarantee universal compatibility from a product page alone.
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Shipping & returns
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Fit & compatibility
Fit & compatibility
Review the product title, description, images, dimensions, part numbers, and manufacturer details before purchase. For fit-sensitive items, confirm compatibility with your boat, RV, trailer, vehicle, or equipment.
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Need help choosing?
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