How to Tie a Rope for Magnet Fishing?

When magnet fishing, a powerful magnet alone is not enough. You also need a suitable rope, a secure connection to the magnet, protective gloves and the correct working procedure.

A mistake in the knot or a damaged rope can result in the loss of both the magnet and the recovered object. If a highly tensioned rope breaks, its end may also move uncontrollably, causing a person to fall or injuring people nearby.

Which knot is best for a fishing magnet?

For directly attaching a rope to a closed magnet eye, a practical choice is the rethreaded figure-eight knot, sometimes also called a retraced or follow-through figure-eight.

Its advantages include:

• a clear shape that is easy to inspect,
• the rope passes directly through the magnet eye,
• when correctly tightened, it creates a secure loop,
• crossed strands are easy to see,
• it can be visually inspected before every use.

What do you need before tying the knot?

• a fishing magnet with a secure eye,
• a strong rope suitable for magnet fishing,
• work gloves,
• enough space to handle the rope,
• good lighting,
• optionally, a non-magnetic tool for removing contaminants.

Inspect the magnet eye before tying

The inside of the eye must not have:

• sharp burrs,
• cracks,
• severe corrosion,
• deformation,
• a damaged weld,
• a loose or damaged thread.

A sharp edge can gradually cut through even a very strong rope as it repeatedly moves against it.

Is the screw-in eye tightened correctly?

On magnets with a screw-in eye, the thread must be clean, undamaged and screwed in completely. The eye must not be attached using only a few turns of the thread.

If the manufacturer permits the use of a thread-locking product, follow their instructions exactly. An unsuitable adhesive may prevent servicing or damage certain materials.

How do you tie a rethreaded figure-eight knot step by step?

1. Leave a sufficiently long rope end

Prepare enough free rope to create the knot. Once finished, a substantial tail must remain beyond the knot, not just a few millimetres.

2. Create a simple figure-eight

Tie a loose figure-eight in the rope, but do not tighten it yet. The knot must remain loose enough for you to retrace its path.

3. Pass the end through the magnet eye

Feed the free end completely through the magnet eye. The rope must not pass over a sharp outer edge or through only part of the eye.

4. Retrace the original figure-eight

Feed the rope end back exactly alongside the first strand. Follow the entire path of the original knot until the free end emerges on the opposite side.

5. Dress all strands neatly

The strands should lie next to one another. They must not cross, twist or pile up on top of each other.

6. Adjust the size of the loop

The loop around the eye should be small enough not to catch unnecessarily, but the knot itself should not rest directly against the structure of the eye.

7. Tighten the knot thoroughly

Gradually pull each of the four strands. Simply pulling hard on the main rope is not enough. The knot must be tightened evenly throughout its entire path.

8. Check the free end

A sufficiently long tail must remain beyond the knot. If it is too short, variable loading may gradually pull the end into the knot.

9. Carry out a test load

Before the first throw, load the assembly in a controlled manner above a solid surface. Check that the knot does not shift and that the eye is not damaging the rope.

Double figure-eight loop

A double figure-eight creates a double loop. It is particularly useful where the load needs to be distributed between two suitable anchor points or where appropriate connecting equipment is used.

For ordinary direct attachment to a single fishing magnet eye, however, it may not be necessary. A correctly tied rethreaded figure-eight is generally easier to inspect.

When should you not use a double loop?

• if you do not know how to distribute the load evenly,
• if one loop could catch or cross over,
• if the connecting element does not have a suitable load rating,
• if you cannot correctly inspect the more complex knot,
• if a simple rethreaded figure-eight is more practical for a single eye.

Bowline

A bowline creates a fixed loop that does not tighten around the eye under load. After heavy loading, it is often easier to untie than some slip knots.

However, safe use requires correct technique and a sufficiently long free end. With some ropes and variable loading, a suitable backup knot may also be used.

Advantages of the bowline

• it does not tighten around the eye,
• it can often be untied relatively easily after loading,
• it has a compact shape,
• it is suitable for experienced users.

Disadvantages

• it is more difficult to inspect than a neatly tied figure-eight,
• an incorrectly tied bowline may look similar to a correct one,
• it requires a sufficiently long free end,
• it is not ideal for someone tying the knot from memory for the first time beside the water.

Noose or slip knot

A slip knot tightens around the eye under load. It is used by some magnet fishers, but as a universal first choice it has several disadvantages.

• it can become very difficult to untie after heavy loading,
• it tightens onto a small radius,
• it can be more difficult to inspect,
• if the number of turns or rope path is incorrect, it may not work properly,
• it can place considerable stress on the rope if the eye is rough or damaged.

Can the magnet be attached using a carabiner?

A carabiner or shackle can allow the rope to be detached quickly from the magnet. However, it also adds another potential point of failure to the assembly.

Only use a connecting element that:

• has a manufacturer-specified load rating,
• is designed for genuine mechanical loading,
• has a secure closure,
• is not deformed or corroded,
• has no sharp edges,
• matches the diameter of the magnet eye.

A cheap decorative keyring carabiner is not a suitable connecting element for magnet fishing.

Advantage of tying directly

When the rope is tied directly through a smooth eye, the carabiner is eliminated, along with another connection that could open, deform or catch underwater.

Which rope is best for magnet fishing?

A suitable rope must be strong, abrasion-resistant, easy to handle when wet and compatible with the magnet being used.

Important rope properties

• sufficient strength with a safety margin,
• abrasion resistance,
• low stretch,
• good grip when wearing wet gloves,
• low water absorption,
• resistance to repeated bending,
• suitable diameter for the eye and knot,
• sufficient length.

Why is polyester rope used?

Polyester rope offers a good combination of strength, abrasion resistance, relatively low stretch and low water absorption.

Compared with a highly elastic rope, it provides better feedback from the magnet. This makes it easier to feel when the magnet has caught on an object, stone or structure.

Advantages of polyester

• relatively low stretch,
• good abrasion resistance,
• low water absorption,
• more stable magnet control,
• good strength,
• suitable for repeated use in water.

Are all climbing ropes unsuitable?

Not all of them, but an ordinary dynamic climbing rope is designed to stretch and absorb energy during a fall. It may therefore be impractical for magnet fishing.

Static and semi-static ropes stretch less, but this does not automatically make them suitable. Important factors include:

• strength and intended use,
• abrasion resistance,
• behaviour when wet,
• diameter,
• compatibility with the eye,
• condition and history of the rope.

Which rope diameter should you choose?

A thicker rope is generally easier to grip and cuts into gloves less. However, it is heavier, more difficult to throw and takes up more space.

The recommended products have:

• a diameter of 5 mm for the rope with a stated load capacity of 340 kg,
• a diameter of 6 mm for the rope with a stated load capacity of 560 kg.

The diameter must also allow the rope to pass safely through the eye and enable the chosen knot to be tied correctly.

Rope load capacity is not the same as safe working load

Do not automatically interpret a stated “load capacity of 340 kg” or “load capacity of 560 kg” as a safe recovery weight.

The overall strength of the assembly is affected by:

• the rope testing method,
• the safety factor,
• the specific knot,
• the radius of the eye,
• abrasion and age of the rope,
• dynamic shock loading,
• direction of the load,
• condition of all connecting elements.

Every knot weakens the rope where it is bent and compressed. There must therefore be a sufficient margin between the expected load and the declared strength.

How are magnet strength and rope strength related?

The pull-off force of a magnet is usually determined under ideal conditions on a clean, flat and sufficiently thick steel surface.

This does not mean that the magnet can safely lift an object of the same weight from water. Rust, mud, curvature and a small contact area significantly reduce magnetic holding force.

At the same time, if the magnet becomes attached to a large steel structure, the load may exceed the ordinary weight of a recovered object. Do not choose a rope only according to the weight of the items you expect to find.

Which rope length should you choose?

15-metre rope

Suitable, for example, for:

• smaller rivers and streams,
• ponds and lakes when fishing close to the bank,
• lower jetties,
• shallower wells and shafts,
• beginners who want a more manageable setup.

30-metre rope

May be suitable for:

• higher bridges,
• deeper wells,
• wider bodies of water,
• longer throws,
• changing the direction of pull along the bank.

Disadvantages of a longer rope

• higher weight when wet,
• greater risk of tangling,
• more loops on the bank,
• more difficult handling,
• greater chance of catching on obstacles.

How should you secure the free end of the rope?

The end of the rope must not disappear into the water during a throw. Secure it before handling the magnet.

Possible securing methods

• a fixed anchor point with sufficient load capacity,
• a suitable loop around a solid structure,
• a separate secure attachment designed for rope,
• controlled storage in a suitable container with the free end physically secured.

How should you prepare the rope before the first throw?

1. Lay the rope out on a clean surface.
2. Remove knots, twists and loops.
3. Inspect its entire length visually and by hand.
4. Secure the free end safely.
5. Dress and tighten the knot at the magnet again.
6. Inspect the eye and any threaded connection.
7. Lay the rope in loose loops so that it can run out smoothly during the throw.
8. Check the area around you.

What should you look for when inspecting the rope?

• frayed areas,
• cuts and damaged braiding,
• flattened or hardened sections,
• traces of chemicals,
• burnt or melted fibres,
• heavy contamination with sand,
• damage close to the knot.

How do you throw a magnet safely?

1. Make sure there are no people, animals or vehicles nearby.
2. Check the space above your head and behind you.
3. Make sure the free end of the rope is secured.
4. Hold the magnet so that it cannot snap towards a railing or steel structure.
5. Throw in a controlled manner rather than using an uncontrolled powerful swing.
6. After impact, allow the magnet to sink to the bottom.
7. Handle the rope while wearing gloves and do not create loops around your feet.

How can you tell that the magnet has caught something?

When pulling slowly, you may feel:

• a sudden increase in resistance,
• a brief metallic snap,
• a change in the direction of the rope,
• irregular movement of an object along the bottom,
• significantly greater weight while pulling upwards.

Do not immediately pull with maximum force. First determine whether the magnet is attached to a movable object or a fixed structure.

What should you do if the magnet or rope becomes stuck?

The magnet may become caught on a bridge structure, steel reinforcement, a large object, branch, stone or another underwater obstacle.

Safe procedure

1. Stop pulling hard.
2. Release some of the tension in the rope.
3. Move several metres along the bank.
4. Try pulling from another angle.
5. Use short, controlled movements.
6. Try pulling opposite to the direction in which the magnet became stuck.
7. If possible, use a second rope or hook from a stable position on the bank.
8. If releasing the magnet would require entering the water dangerously, stop the attempt.

What should you not do?

• do not repeatedly jerk the rope with maximum force,
• do not wrap the rope around your body,
• do not pull the assembly using a vehicle,
• do not enter unknown or fast-flowing water,
• do not jump into the water from a bridge or jetty,
• do not climb over railings,
• do not stand directly in line with a highly tensioned rope,
• do not put yourself or anyone else at risk just to recover the magnet.

Why should you not jerk a stuck rope violently?

A sudden jerk creates short-term dynamic loading that may be considerably greater than a steady pull.

Possible risks include:

• breaking a damaged rope,
• shifting or tightening the knot,
• damaging the magnet eye,
• releasing a heavy object towards the operator,
• causing a person to fall backwards,
• uncontrolled whipping of the rope end,
• damaging the structure to which the magnet is attached.

It is much safer to release the tension, change the pulling angle and use small controlled movements.

How should you retrieve a heavy object?

1. Keep the rope evenly tensioned.
2. Do not pull sharply.
3. Move the object towards shallower water or a more accessible location.
4. Change direction if the object catches on the bottom.
5. Use another suitable rope or hook from a stable bank.
6. For a very heavy object, ask another person for help.
7. If there is a risk of falling, rope failure or entering the water, stop the attempt.

Magnetic holding force can suddenly decrease if the angle changes or the object is struck. Do not stand directly above the object being lifted.

Can a hook be lowered to a heavy object?

A hook can help take some of the load if it can be attached safely to a structural part of the object.

However, it must be:

• designed for the appropriate load,
• connected to a sufficiently strong rope,
• controlled from a stable position,
• used without anyone entering the water,
• kept away from other people.

An improvised hook may come loose and be thrown violently. Do not use it near other people.

How should you care for the rope after magnet fishing?

1. Remove coarse dirt

Mud, sand and small stones can enter the braid and damage the fibres during repeated bending.

2. Rinse the rope with clean water

After use in dirty or salt water, rinse the rope with clean fresh water. Do not use aggressive cleaning products unless approved by the manufacturer.

3. Allow it to dry completely

Lay the rope out or hang it loosely in the shade in a well-ventilated place. Do not dry it on a radiator, over an open flame or in prolonged direct sunlight.

4. Coil the dry rope loosely

Do not create sharp bends or compress the rope heavily during storage.

5. Inspect the knot and highly stressed areas

Pay particular attention to the section near the magnet eye and areas that have been dragged over concrete, stone or metal edges.

When should the rope be discarded?

Do not continue using the rope if you find:

• a deep cut,
• severely frayed braiding,
• visible damage to the core,
• melted or burnt fibres,
• a hard or brittle section,
• severe chemical contamination,
• a significant change in diameter,
• damage following severe overloading,
• unknown history in the case of a used or found rope.

Covering a damaged area with tape is not sufficient. Tape restores the appearance, not the strength of the fibres.

Does the knot need to be untied after every use?

It is advisable to untie it regularly, clean it and inspect the section of rope hidden inside the knot.

A wet knot left tightened for a long time may:

• hide abrasion,
• trap sand and dirt,
• become extremely difficult to untie,
• prevent complete drying,
• hide damage close to the eye.

If you leave the knot tied, inspect it thoroughly before each use and verify it with a controlled load test.

What should you do if you find a weapon or ammunition?

If the fishing magnet catches an object resembling a weapon, ammunition, grenade or other ordnance:

• stop handling the object,
• do not clean, turn or dismantle it,
• do not take it home or to a police station,
• keep other people away,
• move to a safe distance,
• call the Police of the Czech Republic on 158 or the emergency number 112,
• follow the operator's instructions.

Safety when working with a rope and fishing magnet

Recommended equipment for magnet fishing

The selected products represent a complete starter set and two 15-metre polyester ropes with different diameters and manufacturer-stated load capacities.

Frequently asked questions about tying a rope to a fishing magnet

Summary

For directly attaching a rope to a fishing magnet eye, a clear rethreaded figure-eight knot is a suitable choice. The rope end must pass through the eye, retrace the complete original knot and leave a sufficiently long tail when finished.

Choose the rope according to the entire magnet fishing setup, not only according to the expected weight of recovered objects. Knots, abrasion, the condition of the eye, shock loading and connecting elements all reduce actual strength.

Polyester rope offers good abrasion resistance, low water absorption and relatively low stretch. For ordinary use, 15-metre versions with diameters of 5 and 6 mm are available.

If the magnet becomes stuck, do not jerk it with maximum force and do not enter unknown water to recover the equipment. Release the tension, change the pulling angle and stop the attempt if the magnet cannot be recovered safely from the bank.