Selection Guide

Boat anchor 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 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.

 

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 ANCHORS

Boat Lengthft16'-27'28'-32'33'-38'39'-45'46'-51'52'-58'59'-68'69'-150'
m5-8m8-10m10-12m12-14m14-15m16-18m18-21m21-46m
Fortress ModelFX-7FX-11FX-16FX-23FX37FX-55FX-85FX-125
   Weightlb (kg)4 (1.8)7 (3.2)10 (4.5)15 (6.8)21 (9.5)32 (14.4)47 (21.2)69 (31.1)
   Replaces Steel Anchorslb6-910-1314-1819-2833-5050-6570-90100-170
kg3-45-66-89-1315-2323-2932-4145-77
HOLDING POWER
Working Loadlb7009001,2502,0003,0004,0005,2506,750
kg3184085679071,3611,8142,3813,062
32° Hard Sanding Holdinglb2,8003,6005,0008,00012,00016,00021,00027,000
kg1,2701,6332,2683,6295,4437,2589,52612,247
45° Soft Mud Holdinglb8401,0801,5002,4003,6004,8006,3008,100
kg3814906801,0891,6332,1772,8583,674
32° Soft Mud Holdinglb4205407501,2001,8002,4003,1504,050
kg1912453405448161,0891,4291,837
DIMENSIONS
"A" Shank Lengthin (mm)24" (610)27" (686)31" (787)36" (914)40" (1,016)46" (1,168)51" (1,295)56" (1,422)
"B" Fluke Lengthin (mm)14" (356)16" (406)18" (457)21" (533)24" (610)27" (686)30" (762)33" (838)
"C" Stock Lengthin (mm)19" (483)22" (559)25" (635)29" (737)32" (813)37" (940)41" (1,041)45" (1,143)
SUPPORT HARDWARE
Proof Coil Chainin (mm)3/16" (5)1/4" (6)5/16" (8)3/8" (9)3/8" (9)1/2" (13)1/2" (13)1/2" (16)
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)
Shackle Sizein (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)

GUARDIAN ANCHORS

Boat Lengthft12'-16'17'-22'23'-27'28'-33'34'-41'42'-47'48'-53'54'-6263'-72'
m4-5m5-7m7-8m8-10m10-12m12-14m14-16m16-19m19-22m
Guardian ModelG-5G-7G-11G-16G-23G-37G-55G-85G-125
   Weightlb (kg)2 1/2 (1.1)4 (1.8)6 (2.7)7 (3.2)13 (5.9)18 (8.2)29 (13.1)42 (19)65 (29.3)
   Replaces Steel Anchorslb4-66-910-1314-1819-2833-5050-6570-90100-170
kg2-33-45-66-89-1315-2323-2932-4145-77
HOLDING POWER
Working Loadlb3505757501,0751,6252,5003,5004,6256,000
kg1592613404887371,1341,5882,0982,722
Hard Sanding Holdinglb1,0501,7252,2503,2254,8757,50010,50013,87518,000
kg4767821,0211,4632,2113,4024,7636,2948,165
Soft Mud Holdinglb2103454506459751,5002,1002,7753,600
kg951562042934426809531,2591,633
DIMENSIONS
"A" Shank Lengthin (mm)19" (483)22" (559)25" (635)29" (737)33" (838)38" (965)43" (1.092)48" (1,219)53" (1,356)
"B" Fluke Lengthin (mm)11" (279)13" (330)15" (381)17" (432)19" (483)22" (559)25" (635)28" (711)31" (787)
"C" Stock Lengthin (mm)16" (406)18" (457)20" (508)23" (584)27" (686)31" (787)35" (889)39" (991)43" (1,092)
SUPPORT HARDWARE
Proof Coil Chainin (mm)3/16" (5)3/16" (5)3/16" (5)1/4" (6)5/16" (8)3/8" (9)3/8" (9)1/2" (13)1/2" (13)
Nylon Rope **in (mm)3/8" (9)3/8" (9)3/8" (9)3/8" (9)1/2" (13)5/8" (16)3/4" (19)7/8" (22)1" (25)
Shackle Sizein (mm)3/16" (5) 3/16" (5)1/4" (6)1/4" (6)5/16" (8)3/8" (10)7/16" (12)1/2" (12)5/8" (16)

Have questions? Check out our frequently asked questions page.

0