Fortress Marine Anchor

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Fortress Marine Aluminum Fluke Anchor

Boat and marine experts all agree that Fortress Anchors set the industry standard as the “World's Best Anchors”. Their lightweight yet strong construction rate these anchors highest among marine anchors. Fortress Marine Anchors outperform heavier steel anchors yet weigh far less. Their precision manufacturing process makes them sharper than most conventional anchors, which allows them to penetrate the surface deeper and faster than most other anchors that weigh 50% more than the Fortress Anchor.

The Fortress Anchor is available in two shank/fluke angles that allow for outstanding holding power in the most common lake or sea bottoms. With adjustable fluke angles, you are equipped for a variety of different surface bottoms, a 32° angle, is great for clay, mud, or sand. It can also be used at a 45° angle for soft mud.

Key Features:

  • Fortress Marine Anchors are manufactured with lightweight high tensile aluminum alloy that is as strong as steel.
  • Corrosion-resistant durable anodized finish.
  • Rust proof finish
  • Sharper than heavy-duty dull-edged steel anchors
  • Disassembles for easy storage
  • Great spare or storm anchor
  • Features Lifetime Hassle-Free Parts Replacement Warranty

NOTE: Boat size recommendations factor in average windage and proportions in 30 knots of wind, average bottom conditions, and moderate protection from open seas. Also, note that loads in 42 knots of wind ‘weigh’ twice as much as in 30 knots.

We recommend using a three-strand nylon rope, 6-12 ft (2-4 m) of chain, and a minimum of 5:1 scope. Also, a minimum of 6 ft (2 m) of chain should be used for every 25 ft (8 m) of water depth. For storm conditions use an anchor one or two sizes larger.



Recommended Boat Size

Working Load

32° Hard Sand Holding

45° Soft Mud Holding

32° Soft Mud Holding


4 lbs

16' - 27'

700 lbs

2800 lbs

840 lbs

420 lbs


7 lbs

28' - 32'

900 lbs

3600 lbs

1080 lbs

540 lbs


10 lbs

33' - 38'

1250 lbs

5000 lbs

1500 lbs

750 lbs


15 lbs

39' - 45'

2000 lbs

8000 lbs

2400 lbs

1200 lbs


21 lbs

46' - 51'

3000 lbs

12000 lbs

3600 lbs

1800 lbs


32 lbs

52' - 58'

4000 lbs

16000 lbs

4800 lbs

2400 lbs


47 lbs

59' - 68'

5250 lbs

21000 lbs

6300 lbs

3150 lbs


69 lbs

69' - 150'

6750 lbs

27000 lbs

8100 lbs

4050 lbs

Why Fortress?

The Fortress Marine Anchor Advantage

  • Perhaps the best recommendation for Fortress marine anchors is from the U.S. Navy which tests leading anchors. Their results proved that Fortress anchors out-performed much heavier steel anchors, that Fortress anchors withstood pull loads that averaged over 200 times their own weight ... without causing serious damage to the anchors’ structural integrity.

Stronger Holding Power

  • For over 20 years and in test after test, Fortress marine anchors have outperformed substantially heavier steel anchors in holding power tests conducted around the world. From older, well-established anchor brands like the Bruce, CQR, Danforth, or Delta to newer anchors like Manson, Rocna, Spade, and Ultra, the Fortress anchors have consistently demonstrated that their superior design and lightweight alloy can provide outstanding performance at a fraction of the weight.

Faster Setting

  • Easy handling aluminum alloy Fortress anchors are precision-machined for sharpness and quick penetration into common sea bottoms, ensuring faster-setting performance.

Lighter Design

  • Precisely machined interlocking components made from a high-tensile, corrosion-resistant, aluminum-magnesium alloy have no welds to weaken the metal and produce superior holding power while creating a lighter, easy-to-handle anchor.

Quick Assembly and Easily Disassembled

  • Lightweight, fast-setting, and reliable, Fortress marine anchors disassemble quickly for easy storage, which makes them ideal for tight quarters where compact storage is a requisite. Fortress anchors assemble just as quickly, making them an ideal choice for spare or storm anchors. Precision-machined interlocking components made from a high-tensile, corrosion-resistant, aluminum-magnesium alloy have no welds to weaken the metal. Thereby Fortress anchors offer superior holding power while creating a lighter, easy-to-handle anchor. In the unlikely event that any piece of the anchor becomes damaged, the unique assembly/disassembly feature allows the damaged or missing part of your anchor to be easily accessed for parts replacement.

How to Set a Fortress Fluke Anchor

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Warranty Information

Lifetime on parts

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