The shackle is a small but critical link in your anchoring system. It connects your Rocna anchor to the chain—and it’s often the weakest point in the entire setup if not selected carefully.
Here’s what you need to know to ensure strength, fit, and long-term reliability.
Why Shackles Matter #
Shackles offer:
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A secure, direct connection to your chain
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Flexibility in load direction (especially bow-type shackles)
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A more cost-effective and reliable alternative to swivels in most cases
However, not all shackles are created equal, and choosing the wrong type or size can compromise your entire system.
Recommended Shackle Types #
We recommend:
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Galvanized steel shackles for best value and corrosion resistance
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Forged, tested shackles for reliable strength
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Bow shackles for better handling of multi-directional loads
Stainless steel shackles are popular and needed if you ground tackle is all stainless steel, but they vary widely in quality. If you opt for stainless, be extra cautious to source from a reputable brand.
Sizing Guidelines #
The shackle pin must fit through the end link of your chain, and the shackle body must pass through the Rocna anchor’s rode attachment point. Rocna anchors are designed to accommodate most standard chain sizes and corresponding high-load shackles.
Here’s a simplified guide:
| Chain Size | Shackle Pin (max) | Shackle Body (typical) |
|---|---|---|
| 6 mm | < 8 mm | < 7 mm |
| 8 mm | < 10 mm | < 9 mm |
| 10 mm | < 15 mm | < 13 mm |
| 12 mm | < 16 mm | < 13.5 mm |
| 14 mm | < 18 mm | < 16 mm |
Tip: Some chains come with an oversized end link to accommodate a larger shackle.
Installation Tips #
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Always seize your shackle pin (if using a screw collar type) with stainless or monel seizing wire. Two tight wraps will prevent the pin from backing out over time.
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Safety bolt shackles are a great alternative—no seizing needed, though they may require wrenches to install and remove.
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Avoid using two shackles in tandem. Rocna’s design allows most quality shackles to connect directly.
Final Word #
It may be small, but your shackle deserves serious attention. A high-load galvanized bow shackle—sized properly to your chain and anchor—offers the best combination of strength, value, and reliability.