This D shackle with a square head pin (often called a trawling shackle or fishing D shackle) is a heavy-duty rigging connector featuring a screw pin with a distinct square block instead of a traditional rounded eye or flat ear.
The square shape of the head is intentionally designed to fit tightly into specialized marine wrenches or impact socket guns, making it a staple in professional marine and commercial fishing industries.
Key Features
Anti-Tangle Profile: Because it lacks the protruding "ears" or loops of standard screw pins, it presents a much sleeker profile. This prevents nets, ropes, and lines from catching or tangling on the hardware under water.
Vibration and Impact Resistance: The square head pin threads deeply and flushly against the shackle body. It resists backing out or rattling loose when subjected to heavy underwater currents, dragging, or engine vibrations.
Tool-Operated Security: It is designed to be tightened and loosened mechanically using standard wrenches or a socket gun. This provides high-torque tightening and ensures it cannot be casually tampered with or unscrewed by hand.
Industrial Configurations: they are forged from 304 or 316 marine-grade stainless steel for outdoor and extreme saltwater environments.
Primary Applications
Commercial Fishing & Trawling: This is the primary home for square head shackles. They are extensively used to rig trawl gear, secure longlines, and link massive fishing nets to deck machinery without snagging the mesh.
Anchor Chain Links: Used as a terminal connector to bridge anchor chains and rodes because the compact square head travels over anchor rollers and through hawse pipes smoothly.
Heavy Industrial Rigging: Deployed in marine construction and heavy industries for semi-permanent straight-line connections that require long-term durability and resistance to loosening.
Place your order for your D Shackle with Square Head
Are you planning to use this shackle for a trawling/net rigging setup, or are you looking for an anchor connection? Let me know the details so I can recommend the right material grade and load limit.
Haifan Rigging is pleased to sell D Shackle with Square Head. No matter if you need the shackle for securing rigging or for any other work,this type of screw can fulfil all sorts of requirements.
If you wish to ask a question or need further advice, you are welcome to contact us.
We’ll be happy to help.
