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Description
Fortress Fx-37 21lb Anchor For 46-51' BoatsThe Legendary Fortress Anchor In test after test, from coast to coast and from around the world, no anchor in history has been called ? The World? s Best Anchor? by more boaters and respected marine experts than Fortress and for good reason. Years of research and development, high tech materials and manufacturing and thousands of real world tests are your assurance of performance, quality, and value. Fortress weighs only half as much as heavier steel
The Legendary Fortress Anchor
In test after test, from coast to coast and from around the world, no anchor in history has been called ?The World?s Best Anchor? by more boaters and respected marine experts than Fortress...and for good reason.
Years of research and development, high-tech materials and manufacturing and thousands of real world tests are your assurance of performance, quality, and value. Fortress weighs only half as much as heavier steel anchors and yet outperforms them all.
Why? Because the Fortress design does not depend upon weight to provide world class performance. All this adds up to your best value in anchoring safety and convenience.
| Feature | Benefit |
| Precision-machined from an aluminum alloy that is as strong as steel, but only half the weight. |
|
| Can be disassembled |
|
| Lifetime Parts Replacement Warranty |
|
| Adjustable 32 to 45 fluke angle |
|
| Tough anodized finish |
|
| FORTRESS SELECTION GUIDE | |||||||||
| Model | FX-7 | FX-11 | FX-16 | FX-23 | FX-37 | FX-55 | FX-85 | FX-125 | |
| Boat Length | |||||||||
| ft | 16'-27' | 28'-32' | 33'-38' | 39'-45' | 46'-51' | 52'-58' | 59'-68' | 69'-150' | |
| m | 5-8 | 8-10 | 10-12 | 12-14 | 14-15 | 16-18 | 18-21 | 21-46 | |
| Weight | lb | 4 | 7 | 10 | 15 | 21 | 32 | 47 | 69 |
| kg | 1.8 | 3.2 | 4.5 | 6.8 | 9.5 | 14.4 | 21.2 | 31.1 | |
| Replaces Steel Anchors | lb | 6-9 | 10-13 | 14-18 | 19-28 | 33-50 | 50-65 | 70-90 | 100-170 |
| kg | 3-4 | 5-6 | 6-8 | 9-13 | 15-23 | 23-29 | 32-41 | 45-77 | |
| HOLDING POWER | |||||||||
| Model | FX-7 | FX-11 | FX-16 | FX-23 | FX-37 | FX-55 | FX-85 | FX-125 | |
| Working Load | |||||||||
| lb | 700 | 900 | 1.250 | 2,000 | 3,000 | 4,000 | 5,250 | 6,750 | |
| kg | 318 | 408 | 567 | 907 | 1,351 | 1,814 | 2,381 | 3,062 | |
| 32 Degree Hard Sand Holding Power | lb | 2,800 | 3,600 | 5,000 | 8,000 | 12,000 | 16,000 | 21,000 | 27,000 |
| kg | 1,270 | 1,633 | 2,268 | 3,629 | 5,443 | 7,258 | 9,536 | 12,247 | |
| 45 Degree Soft Mud Holding Power | lb | 840 | 1,080 | 1,500 | 2,400 | 3,600 | 4,800 | 6,300 | 8,100 |
| kg | 381 | 490 | 680 | 1,089 | 1,633 | 2,177 | 2,858 | 3,674 | |
| 32 Degree Soft Mud Holding Power | lb | 420 | 540 | 750 | 1,200 | 1,800 | 2,400 | 3,150 | 4,050 |
| kg | 191 | 245 | 340 | 544 | 816 | 1,089 | 1,429 | 1,837 | |
| DIMENSIONS | |||||||||
| Model | FX-7 | FX-11 | FX-16 | FX-23 | FX-37 | FX-55 | FX-85 | FX-125 | |
| "A" Shank Length | |||||||||
| in | 24" | 27" | 31" | 36" | 40" | 46" | 51" | 56" | |
| mm | 610 | 685 | 787 | 914 | 1,016 | 1,168 | 1,295 | 1,422 | |
| "B" Fluke Length | in | 14" | 16" | 18" | 21" | 24" | 27" | 30" | 33" |
| mm | 356 | 406 | 457 | 533 | 610 | 686 | 762 | 838 | |
| "C" Stock Length | in | 19" | 22" | 25" | 29" | 32" | 37" | 41" | 45" |
| mm | 483 | 559 | 635 | 737 | 813 | 940 | 1,041 | 1,143 | |
| SUPPORT HARDWARE | |||||||||
| Model | FX-7 | FX-11 | FX-16 | FX-23 | FX-37 | FX-55 | FX-85 | FX-125 | |
| Proof Coil Chain | |||||||||
| in | 3/16" | 1/4" | 5/16" | 3/8" | 3/8" | 1/2" | 1/2" | 1/2" | |
| mm | 5 | 6 | 8 | 9 | 9 | 13 | 13 | 13 | |
| Nylon Rope** | in | 3/8" | 3/8" | 1/2" | 5/8" | 3/4" | 7/8" | 1" | 1 1/4" |
| mm | 9 | 9 | 13 | 16 | 19 | 22 | 25 | 32 | |
| Shackle Size | in | 1/4" | 1/4" | 5/16" | 3/8" | 7/16" | 1/2" | 5/8" | 5/8" |
| mm | 6 | 6 | 8 | 10 | 12 | 12 | 16 | 16 | |
| NOTE: Hard sand holding power figures above represent loads actually achieved on production FORTRESS and Guardian anchors under controlled horizontal pull conditions without dragging or resulting in disabling structural deformation. ** Rope recommendations are based on 25% of breaking strength. Rope must be in good condition. |
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4.5 ★★★★★
Based on 21 reviews
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Product Reviews
★★★★★ 5
Tulsa
Format: Paperback, Format: Paperback
This was a good read. Very informative.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 6, 2025
★★★★★ 5
An Impressive detailed account for many to learn from
Format: Paperback
I haven’t finished with 2 chapters remaining but it’s a well thought out and vivid account of the horrific events of the Tulsa massacre. I was a novice on this event, having only known the high level details, and was given a more detailed lesson and edification of he horrific massacre of the Greenwood district of Tulsa OK. Well done Mr King!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 20, 2025
★★★★★ 3
Small
Format: Paperback, Format: Paperback
It was the size of a pamphlet not a book at all.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 25, 2025
★★★★★ 5
Gift
Format: Paperback
Arrived timely. Was a gift. He enjoyed it.
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Reviewed in the United States on October 11, 2025
★★★★★ 5
A Must Read! I Cited it in my Book!
This book is a worthy read. It was good enough that I had to cite it in my book: The Real Wakandas of Africa: Dr. John Henrik Clarke vs. Herman Cain. The real value in this book is how it shaped the perspective of many black churches in America. In fact, it should be mandatory reading for every leader of a black church. The author maps a framework that was considered to be cutting edge for the churches of his day. This author was impacted by leaders such as Dr. Martin Luther King Jr. and Malcolm X. In fact, he has another book on these leaders. Surely, this book was influenced by his perspective on these two great black men. You’ll find this work provides both a home for black Christian thought and a framework for the worship of christianity in the black community. However, you might not agree with every idea. As with any work that attempts to forge a new ideology, a certain dogma can come along with that ideology. Indeed, this is needed in many arenas that impact black people. Nevertheless, this book is a classic and an important read. If you wish to understand more about ways in which to improve the black community through the church, this book is fundamental. It is a must read!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 15, 2021
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