How to select the correct chain for your Anchor

Selecting the correct chain size is just as important as choosing the right anchor. Chain helps your anchor hold by keeping the pull low and horizontal along the seabed. While the table below provides general guidance, always consider your boat’s weight, windage, and where you typically anchor.

Chain size for Heavy / HD Plough Anchors on Larger Boats

e.g. Delta, DC, Manson & Rocna

Heavy Plough Anchors (For Larger Vessels)

For larger vessels, particularly those with significant displacement, higher windage (such as flybridge cruisers, trawlers, and sailing yachts with tall rigs), or boats regularly operating in exposed anchorages, a heavy plough-style anchor is often the preferred choice. This category includes oversized variants of traditional plough anchors as well as high-strength models designed specifically for vessels above the typical recreational size range.

Why Choose a Heavy Plough Anchor?

Heavy plough anchors provide:

• Exceptional holding power in a wide variety of seabeds, including mud, sand, weed, and mixed conditions.
• Reliable resetting if the wind or tide shifts, due to their self-righting geometry and deep penetration.
• High mass and structural strength, offering predictable performance for heavier vessels.
• These anchors are commonly used on boats in the 10–30 metre+ range, depending on design and construction, and are popular for extended cruising, offshore passagemaking, and commercial or survey-style vessels.
  
  

Important Considerations for Large Vessels:

When selecting a heavy plough anchor, it’s crucial to understand that larger boats place exponentially more load on ground tackle. Because of this, standard recreational anchor sizing charts may not apply.

Factors that significantly influence anchor and chain requirements include:

• Vessel displacement
• Hull profile and windage (large cabins, hardtops, towers, and flybridges increase load dramatically)
• Operational environment (swell, tide, tidal flow, unprotected anchorages)
  Seabed type
• Anchor winch/windlass rating and gypsy compatibility
• Chain grade and strength rating (L-Grade / G40 / G43 / G70, etc.)
• Chain pitch compatibility between the chain and the windlass gypsy
• Because of these variations, heavy plough anchors for large vessels must be selected with special attention to the complete anchoring system.
   
  
  

Disclaimer for Heavy Plough Anchors:

Due to the increased loads involved with larger vessels, heavy plough anchors may require specific chain sizes, higher-grade chain (e.g., L-Grade, G40, G70), reinforced bow rollers, and windlasses designed to handle the anchor’s weight and chain specifications.

Anchor selection for large vessels should always consider:

• Manufacturer recommendations
• Windlass/gypsy sizing requirements
• Chain grade strength requirements
• Professional installation and load testing, where applicable
• When in doubt, we strongly recommend contacting your anchor and vessel manufacturer.
   

How Much Chain Should You Carry?

For most boats, your anchor rode should include enough chain to keep the pull of your anchor horizontal across the bottom:

Guidance for Chain Length / Rode Scope:

In addition to matching chain diameter, always allow for sufficient chain length (scope) so the pull on the anchor is horizontal along the seabed.

• Recommended minimum chain length: 1.5 × the length of your boat (waterline)
• Use an all-chain rode when anchoring in reef / rocky or abrasive bottoms, to protect the rope from chafe.
• If using a chain and rope rode, ensure the chain section is long enough to absorb shock and maintain a low anchor pull angle.