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Screw Marine Anchors, Securing Ground Shore Anchor

Screw Marine Anchors, Securing Ground Shore Anchor

Mfr. Joslin

Screw Marine Anchors, Securing Ground Shore Anchor. Hot-dipped galvanized Screw Marine Anchors install manually or with power driven equipment. Anchors are commonly used for permanent mooring... See Details...

Screw Anchor, 4 Inch Diameter, 54" Length
Mfr No. J6524WCA | Part No. 88163


Screw Anchor, 6 Inch Diameter, 65" Length
Mfr No. J6526WCA | Part No. 88164


Screw Anchor, 8 Inch Diameter, 65" Length
Mfr No. 8SCREW | Part No. 88165

Screw Marine Anchors, Securing Ground Shore Anchor
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Screw Marine Anchors, Securing Ground Shore Anchor. Excellent holding anchor for a mooring or on the shore. Ring on top fits bar to screw into the surface. Originally designed for cable ground anchors for telephone poles!

  • Hot-dipped galvanized anchors
  • Use 5/8" shackle minumum
  • Install manually or with power driven equipment
  • These anchors are commonly used for permanent moorings
  • Ideal anchor for securing logs to beach fronts

When ordering multiple quantities our shipping calculator does not have the capacity to calculate the cost properly. In this case we will put your order on hold and contact you immediately pending your approval of shipping quote

Holding Strength

Helix Diameter (Inches)
Soil Classification
  8 7 6 5
1000 lbs holding strength
5/8", 3/4" recommended anchor shaft size
2000 lbs
5/8", 3/4"
4000 lbs
5/8", 3/4"
6500 lbs
5/8", 3/4"
8 2000 lbs holding strength
1" recommended anchor shaft size
4000 lbs
7000 lbs
10,000 lbs
10 4000 lbs holding strength
1-1/4"" recommended anchor shaft size
4000 lbs
7000 lbs
10,000 lbs
15 6000 lbs holding strength
1-1/4"" recommended anchor shaft size
6000 lbs
13,000 lbs
18,000 lbs

Shaft Torque Capacity

Shaft Size (Inches)
Ultimate Torsional Strength (Ft.-Lbs)
1 1/4

Torsional strength in plane perpendicular to shaft axis

  • Class 4: Medium Dense sandy gravel, very stiff to hard silts and clays
  • Class 5: Medium dense coarse sand and sandy gravels, stiff to very stiff silts and clays
  • Class 6: Loose to medium dense fine to coarse sand, firm to stiff clays and silts
  • Class 7: Loose fine sand, soft-firm clays, varied clays and fill
  • Class 8: Peat, organic silts;inundated silts and fly ash
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Review and FAQ Center

Anchor Screw Mooring Spec

Please advise of the correct single screw size for a 25’ 4000 lb sailboat to be moored in 7’ sandy/silt bottom with up to 2’ waves and 40+ mph t-storm winds. Can use a few engine blocks at anchor shaft-chain attachment point for additional weight. Is it helpful to use an additional shaft extension for deeper soil penetration?

Submitted by: Lunch Parrot

The anchor screw with an 8 inch diameter should work well. The additional weight of the engine blocks will definitely help, as well as deeper soil penetration.

Screw size

Hi, Screw size for 26000llbs 37 irwin ketch in Sandy bottom west fl?
thank you

Submitted by: jeff

We only sell up to 8" diameter screw marine anchors, but we can order up to 15". Depending on conditions, you will need more than one for that size boat and at least 15" diameter.

helix mooring anchors

I want a helix anchor to moor a 30ft wooden cruiser sternfast in a freshwater marina 5 ft deep with a mud/silt bottom. I am told the boat weighs 3 ton,
Can you recommend an anchor and supply me in Australia?

Submitted by: Sean Goodwin

Yes, we ship to Australia all the time! We do not have anything that large, but you can use more than one of the anchors at the link below.

Screw Marine Anchors, Securing Ground Shore Anchor

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pid: 88163F
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