4mm Shallow Bow Shackle

Harken 4mm Shallow Bow Shackle

The Harken 4mm Shallow Bow Shackle (Part No. 2131F) is a precision-engineered forged stainless steel shackle built for demanding marine and sportfishing environments. Each shackle is polished to a high luster and stamped with the screw pin diameter for quick identification in the field. Bow shackles are the preferred choice for multidirectional loads, and the shallow bow design takes this further by being proportionally wider for its length compared to regular bow shackles, providing improved load distribution and versatility in tight rigging configurations.

Despite its small size—weighing only 8.5 g (0.3 oz)—this shackle delivers impressive performance with a maximum working load of 367 kg (810 lb) and a breaking load of 735 kg (1620 lb). The 4 mm (5/32 in) screw pin diameter allows for secure fastening while keeping the overall profile compact. Precise dimensional specifications (A: 16 mm / 5/8 in; B: 8 mm / 5/16 in; C: 11 mm / 7/16 in) ensure compatibility with standard marine hardware.

Manufactured by Harken, a globally recognized leader in sailing and sportfishing hardware, this shackle is built to withstand the rigors of saltwater use. It is suitable for a wide range of applications including rigging attachment points, fishing outrigger systems, block connections, and general deck hardware.

Key Features

• Forged stainless steel construction polished to a high luster
• Stamped with screw pin diameter for easy field identification
• Shallow bow design—proportionally wider than standard bow shackles for improved multidirectional load handling
• Maximum working load: 367 kg (810 lb)
• Breaking load: 735 kg (1620 lb)
• Lightweight at only 8.5 g (0.3 oz)
• 4 mm (5/32 in) screw pin diameter
• Compact dimensions: A = 16 mm (5/8 in), B = 8 mm (5/16 in), C = 11 mm (7/16 in)
• Corrosion resistant for saltwater marine environments
• Suitable for sportfishing, sailing rigging, and general marine hardware applications