Anchor Selection & Specifications Guide
Boat size recommendations are for boats of average windage and proportions in 30 knots of wind, average bottom conditions, and moderate protection from open seas. Remember that the loads in 42 knots of wind are twice as much as in 30 knots.

Use three-strand nylon line, 6-12 ft (2-4 m) of chain and a minimum of 5:1 scope. A minimum of 6 ft (2 m) of chain should be used for every 25 ft (8 m) of water that you usually anchor in. For storm conditions use an anchor one or two sizes larger.

Exclusively on Fortress..
[Guardian Anchor Guide]
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 [diagram]
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 [diagram]
in
 14" 16" 18" 21" 24" 27" 30" 33"
mm
 356 406 457 533 610 686 762 838
"C" Stock Length [diagram]
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.

[Fortress Selection guide] [Top of page]
GUARDIAN SELECTION GUIDE
Model G-5 G-7 G-11 G-16 G-23 G-37 G-55 G-85 G-125
Boat Length
ft 12'-16' 17'-22' 23'-27' 28'-33' 34'-41' 42'-47' 48'-53' 54'-62' 63'-72
m 4-5 5-7 7-8 8-10 10-12 12-14 14-16 16-19 19-22
Weight
 lb 2 1/2 4 6 7 13 18 29 42 65
kg 1.1 1.8 2.7 3.2 5.9 8.1 13.1 19 29.3
Replaces Steel Anchors
 lb 4-6 6-9 10-13 14-18 19-28 33-50 50-65 70-90 100-170
kg 2-3 3-4 5-6 6-8 9-13 15-23 23-29 32-41 45-77
HOLDING POWER
Model G-5 G-7 G-11 G-16 G-23 G-37 G-55 G-85 G-125
Working Load
lb 350 575 750 1,075 1,625 2,500 3,500 4,625 6,000
kg 159 261 340 488 737 1,134 1,588 2,098 2,722
32° Hard Sand Holding Power lb 1,050 1,725 2,250 3,225 4,875 7,500 10,500 13,875 18,000
kg 476 782 1,021 1,462 2,211 3,402 4,763 6,294 8,165
32° Soft Mud Holding Power lb 210 345 450 645 975 1,500 2,100 2,775 3,600
kg 95 156 204 293 442 680 953 1,259 1,633
DIMENSIONS
Model G-5 G-7 G-11 G-16 G-23 G-37 G-55 G-85 G-125
"A" Shank Length [diagram]
in 19" 22" 25" 29" 33" 38" 43" 48" 53"
mm 483 559 635 737 838 965 1,092 1,219 1,346
"B" Fluke Length [diagram] in 11" 13" 15" 17" 19" 22" 25" 28" 31"
mm 179 330 381 432 483 559 635 711 787
"C" Stock Length [diagram] in 16" 18" 20" 23" 27" 31" 35" 39" 43"
mm 406 457 508 584 686 787 889 991 1,092
SUPPORT HARDWARE
Model G-5 G-7 G-11 G-16 G-23 G-37 G-55 G-85 G-125
Proof Coil Chain
in 3/16" 3/16" 3/16" 1/4" 5/16" 3/8" 3/8" 1/2" 1/2"
mm 5 5 5 6 8 9 9 13 13
Nylon Rope** in 3/8" 3/8" 3/8" 3/8" 1/2" 5/8" 3/4" 7/8" 1"
mm 9 9 9 9 13 16 19 22 25
Shackle Size in 3/16" 3/16" 1/4" 1/4" 5/16" 3/8" 7/16" 1/2" 5/8"
mm 5 5 6 6 8 10 12 12 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

[Top of page]