Fortress Anchors
No Other Anchor Compares to Fortress Anchors, the Best Value in Anchoring Safety and Convenience
SUPERIOR DESIGN
Fortress® Anchors are constructed from a high-tensile, corrosion-resistant, aluminum alloy that is precision-machined into interlocking components with no welds that weaken the metal structure. This results in a lighter, easy to handle anchor providing superior holding power.
SUPERIOR PERFORMANCE
Since 1986, the much lighter Fortress have consistently out-performed heavier steel anchors in holding power tests conducted around the world. In the US Navy tests, not only did Fortress® Anchors out-perform heavier steel anchors, they were also able to withstand pull loads that averaged over 200x their own weight…and without incurring serious damage, which was noted in the test report summary:
The fact that Fortress® Anchors incurred no significant structural damage at such high holding ratios suggests that the anchors have been extensively engineered from both the hydrodynamic and structural standpoints.
FORTRESS SELECTION GUIDE
| Boat Length | ft | 16'-27' | 28'-32' | 33'-38' | 39'-45' | 46'-51' | 52'-58' | 59'-68' | 69'-89' | 90'-150' |
| m | 5-8m | 8-10m | 10-12m | 12-14m | 14-15m | 16-18m | 18-21m | 21-27.1m | 27.4-46m | |
| Fortress Model | FX-7 | FX-11 | FX-16 | FX-23 | FX37 | FX-55 | FX-85 | FX-115 | FX-125 | |
| Weight | lb (kg) | 4 (1.8) | 7 (3.2) | 10 (4.5) | 15 (6.8) | 21 (9.5) | 32 (14.4) | 47 (21.2) | 60 (27.2) | 69 (31.1) |
| Replaces Steel Anchors | lb | 6-9 | 10-13 | 14-18 | 19-28 | 33-50 | 50-65 | 70-90 | 90-100 | 100-170 |
| kg | 3-4 | 5-6 | 6-8 | 9-13 | 15-23 | 23-29 | 32-41 | 42-44 | 45-77 | |
| HOLDING POWER | ||||||||||
| Working Load | lb | 700 | 900 | 1,250 | 2,000 | 3,000 | 4,000 | 5,250 | 6,000 | 6,750 |
| kg | 318 | 408 | 567 | 907 | 1,361 | 1,814 | 2,381 | 2,721 | 3,062 | |
| 32° Hard Sanding Holding | lb | 2,800 | 3,600 | 5,000 | 8,000 | 12,000 | 16,000 | 21,000 | 24,000 | 27,000 |
| kg | 1,270 | 1,633 | 2,268 | 3,629 | 5,443 | 7,258 | 9,526 | 10,886 | 12,247 | |
| 45° Soft Mud Holding | lb | 840 | 1,080 | 1,500 | 2,400 | 3,600 | 4,800 | 6,300 | 7,200 | 8,100 |
| kg | 381 | 490 | 680 | 1,089 | 1,633 | 2,177 | 2,858 | 3,265 | 3,674 | |
| 32° Soft Mud Holding | lb | 420 | 540 | 750 | 1,200 | 1,800 | 2,400 | 3,150 | 3,600 | 4,050 |
| kg | 191 | 245 | 340 | 544 | 816 | 1,089 | 1,429 | 1,633 | 1,837 | |
| DIMENSIONS | ||||||||||
| "A" Shank Length | in (mm) | 24" (610) | 27" (686) | 31" (787) | 36" (914) | 40" (1,016) | 46" (1,168) | 51" (1,295) | 51" (1295) | 56" (1,422) |
| "B" Fluke Length | in (mm) | 14" (356) | 16" (406) | 18" (457) | 21" (533) | 24" (610) | 27" (686) | 30" (762) | 33" (838) | 33" (838) |
| "C" Stock Length | in (mm) | 19" (483) | 22" (559) | 25" (635) | 29" (737) | 32" (813) | 37" (940) | 41" (1,041) | 45" (1,143) | 45" (1,143) |
| SUPPORT HARDWARE | ||||||||||
| Proof Coil Chain | in (mm) | 3/16" (5) | 1/4" (6) | 5/16" (8) | 3/8" (9) | 3/8" (9) | 1/2" (13) | 1/2" (13) | 1/2" (13) | 1/2" (13) |
| Nylon Rope ** | in (mm) | 3/8" (9) | 3/8" (9) | 1/2" (13) | 5/8" (16) | 3/4" (19) | 7/8" (22) | 1" (25) | 1 1/4" (32) | 1 1/4" (32) |
| Shackle Size | in (mm) | 1/4" (6) | 1/4" (6) | 5/16" (8) | 3/8" (10) | 7/16" (12) | 1/2" (12) | 5/8" (16) | 5/8" (16) | 5/8" (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 manufacturer’s ratings of 25% of breaking strength. Rope must be in good condition.
For tech questions please email us at techsupport@fortressanchors.com and a Fortress Marine Anchors representative will respond in 24-48 hours.
