Magnet fishing in XL

Two instructions for making your own magnetic fishing rod
Author: M. B., Netherlands
Table of Contents

Ring magnet as fishing hook

For many years I have been looking for old metal objects with a metal detector. The dream of every collector is finding an old cannonball, which is not easy to do. I knew: There are probably countless of those treasures still in the water. But how could I find them? I almost gave up hope - until I ordered a huge ring magnet with an adhesive force of 120 kg.
Required material
  • Ring magnet R-60-06-30-N
  • Countersunk screw M6 made of chrome steel
  • Washer M8 (to increase the bearing surface of the screw head)
  • Hollow screw M16
  • Stop nut M8
  • Ring bolt M8
  • Shrinking hose (for fastening the nylon rope)
  • Nylon rope 20-25m
The composition of these parts can be seen on the pictures.
Unbelievable how strong this magnet is! The largest cannonball that I dragged out of the water one night had a diameter of almost 11 cm and was pretty heavy. Meanwhile, I fished some smaller ones out of the water.
I always have various spectators when I do my "fishing". They are amazed by the huge things I can fish out of the water with this magnet!

Note from the supermagnete team:
Neodymium magnets will start to rust when used outdoors for longer periods of time. The sole exception are rubberised neodymium magnets, which are completely waterproof. Please review the following tips for using magnets outdoors.

Extreme collection magnet with pot magnets

Addition from Thomas Hirsch, Berlin (Germany):
I used the following components to assemble my retrieval magnet:
  • 7 CSN-60
  • 1 aluminium bus 100 cm x 3cm x 2 mm
  • 7 rust-proof screws M6
  • 7 rust-proof stop nuts M6
  • 1 rust-proof ring nut M6
  • 1 static rope of your choice
You also need a metal saw and a power drill. Saw the aluminium bus into pieces of 6 x 8 cm and 3 x 14 cm. Drill a hole in each center, 1 cm away from both ends. Put it together as shown in the picture. Now you have a big retrieval magnet with a theoretical holding power of 7 x 110 kg, which you can use to "graze" extensive areas. Due to its large scale, stuff really sticks to it. In reality, underwater rust dust and metal splinters quickly stick to the magnets, which reduces their overall adhesive force.
Unfortunately, I didn't have much time to try it out - but here are a few of my "finds": Various steel cables, a ring bolt, a cut bicycle lock type Burg-Wächter F1 from 1997, according to information provided by the company, and a can bottom dated "31 07 1996".


Creator of the photos for this application is Thomas Hirsch, who made them available under the licence Creative Commons CC-BY 2.0.


You can find further helpful information in our "Which magnets do I use for magnet fishing?".

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