The Fortress FX-7 4LB Anchor is the legendary choice for boats from 16' to 27', trusted by boaters and marine experts around the world. It delivers world-class holding power without the weight, thanks to Fortress’ innovative design and precision engineering.
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Lightweight, high-strength aluminum — A precision-machined aluminum alloy that is as strong as steel but only half the weight, making handling and deployment effortless.
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Rustproof and durable — Tough anodized finish provides corrosion resistance and a handsome, long-lasting appearance.
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Faster set, deeper hold — Sharper than heavy, dull-edged steel anchors, it sets quickly and penetrates deeper into common sea bottoms for incredible holding power.
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Disassemblable design — Easy to store and perfect as a spare or storm anchor when space is limited.
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Lifetime Parts Replacement Warranty (Forever) — Free replacement of any damaged anchor part, ensuring peace of mind for years of anchoring safety and convenience.
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Exclusive 32–45° fluke angle — Patented feature that dramatically increases holding power in soft mud bottoms.
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Versatile, proven performance — Built to outperform heavier steel anchors, delivering reliable performance every time you anchor.
Performance and specs at a glance
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Boat length compatibility: 16'–27' (FX-7)
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Weight: 4 lb (≈1.8 kg)
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Holding power (typical): up to 2,800 lb in 32° hard sand; up to 840 lb in 32° soft mud; up to 420 lb in 32° soft mud with median conditions
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Included hardware (FX-7): 3/16" proof coil chain and 3/8" nylon rope; 1/4" shackle
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Construction: Aluminum alloy forged and anodized for maximum strength, minimum weight, and corrosion resistance
Designed to be the best value in anchoring safety and convenience, the Fortress FX-7 combines lightweight handling with heavyweight performance. Its proven reliability makes it a staple on deck, ensuring you stay secure in a wide range of bottoms and conditions. Choose Fortress for a dependable anchor that’s easy to store, easy to use, and built to last a lifetime.
| Feature | Benefit |
Precision-machined from an aluminum alloy that is as strong as steel, but only half the weight. | - Easy to manage weight
- Rustproof
- Sharper than heavy, dull-edged steel anchors
- Will set faster and penetrate deeper into common sea bottoms for incredible holding power
|
| Can be disassembled | - Excellent as a spare or storm anchor
- Easy to store
|
| Lifetime Parts Replacement Warranty | - Free replacement of any damaged anchor part...Forever!*
|
| Adjustable 32 to 45 fluke angle | - Exclusive and patented feature which dramatically increases holding power in problem soft mud bottoms
|
| Tough anodized finish | - Handsome and durable appearance
- Corrision resistant
|
| 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. |
