Product available Ships tomorrow

MW 5x15 / N38 - cylindrical magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

cylindrical magnet

Catalog no 010084

GTIN/EAN: 5906301810834

5.00

Diameter Ø

5 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

2.21 g

Magnetization Direction

↑ axial

Load capacity

0.48 kg / 4.68 N

Magnetic Induction

610.03 mT / 6100 Gs

Coating

[NiCuNi] Nickel

technical details »

1.107 ZŁ with VAT / pcs + price for transport

0.900 ZŁ net + 23% VAT / pcs

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Technical of the product - MW 5x15 / N38 - cylindrical magnet

Specification / characteristics - MW 5x15 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010084
GTIN/EAN	5906301810834
Production/Distribution	Dhit sp. z o.o. ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin	Poland / China / Germany
Customs code	85059029
Diameter Ø	5 mm [±0,1 mm]
Height	15 mm [±0,1 mm]
Weight	2.21 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.48 kg / 4.68 N
Magnetic Induction ~ ?	610.03 mT / 6100 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 5x15 / N38 - cylindrical magnet

properties	values	units
remenance Br [min. - max.] ?	12.2-12.6	kGs
remenance Br [min. - max.] ?	1220-1260	mT
coercivity bHc ?	10.8-11.5	kOe
coercivity bHc ?	860-915	kA/m
actual internal force iHc	≥ 12	kOe
actual internal force iHc	≥ 955	kA/m
energy density [min. - max.] ?	36-38	BH max MGOe
energy density [min. - max.] ?	287-303	BH max KJ/m
max. temperature ?	≤ 80	°C

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

properties	values	units
Vickers hardness	≥550	Hv
Density	≥7.4	g/cm³
Curie Temperature TC	312 - 380	°C
Curie Temperature TF	593 - 716	°F
Specific resistance	150	μΩ⋅cm
Bending strength	250	MPa
Compressive strength	1000~1100	MPa
Thermal expansion parallel (∥) to orientation (M)	(3-4) x 10^-6	°C^-1
Thermal expansion perpendicular (⊥) to orientation (M)	-(1-3) x 10^-6	°C^-1
Young's modulus	1.7 x 10⁴	kg/mm²

Physical simulation of the assembly - report

Presented data are the outcome of a engineering calculation. Values rely on algorithms for the material Nd₂Fe₁₄B. Actual parameters might slightly deviate from the simulation results. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs gap) - power drop
MW 5x15 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	6091 Gs 609.1 mT	0.48 kg / 480.0 g 4.7 N	low risk
1 mm	3823 Gs 382.3 mT	0.19 kg / 189.1 g 1.9 N	low risk
2 mm	2261 Gs 226.1 mT	0.07 kg / 66.1 g 0.6 N	low risk
3 mm	1378 Gs 137.8 mT	0.02 kg / 24.6 g 0.2 N	low risk
5 mm	607 Gs 60.7 mT	0.00 kg / 4.8 g 0.0 N	low risk
10 mm	154 Gs 15.4 mT	0.00 kg / 0.3 g 0.0 N	low risk
15 mm	63 Gs 6.3 mT	0.00 kg / 0.1 g 0.0 N	low risk
20 mm	32 Gs 3.2 mT	0.00 kg / 0.0 g 0.0 N	low risk
30 mm	12 Gs 1.2 mT	0.00 kg / 0.0 g 0.0 N	low risk
50 mm	3 Gs 0.3 mT	0.00 kg / 0.0 g 0.0 N	low risk

Pulling power decreases drastically per each millimeter of distance. Remember that even a very thin break (e.g., contamination, paint, veneer) significantly weakens the grip. Magnetic products hold optimally in perfect adhesion; air break kills the power. Notice how rapidly the parameters plummet, when the magnet does not adhere flatly to the steel surface. When calculating the arrangement, avoid unnecessary gaps.

Table 2: Slippage capacity (wall)
MW 5x15 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.10 kg / 96.0 g 0.9 N
1 mm	Stal (~0.2)	0.04 kg / 38.0 g 0.4 N
2 mm	Stal (~0.2)	0.01 kg / 14.0 g 0.1 N
3 mm	Stal (~0.2)	0.00 kg / 4.0 g 0.0 N
5 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
10 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
15 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

This section presents the estimated force necessary to start the shifting of the magnet downwards along a vertical metal surface (considering typical friction coefficient). This value is relative to the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 5x15 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.14 kg / 144.0 g 1.4 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.10 kg / 96.0 g 0.9 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.05 kg / 48.0 g 0.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.24 kg / 240.0 g 2.4 N

When mounting a holder on a upright plane (e.g., a car body), it you can count on only about 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient cause that holders slip easier than they pop off the substrate. Planning a wall mount? Consider that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the magnet will slide down under a noticeably lighter load. Using a rubber layer can significantly increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 5x15 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.05 kg / 48.0 g 0.5 N
1 mm	25%	0.12 kg / 120.0 g 1.2 N
2 mm	50%	0.24 kg / 240.0 g 2.4 N
5 mm	100%	0.48 kg / 480.0 g 4.7 N
10 mm	100%	0.48 kg / 480.0 g 4.7 N

A thin sheet cannot take in the full magnetic flux, which squanders power of the magnet. Should you mount a strong magnet to a thin surface, the field will pass right through and the attraction force will be weaker. To squeeze the maximum of this neodymium's potential, you require a sufficiently solid backing of steel. The material oversaturation means that on delicate walls (e.g., appliance housings), the holder works worse. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal resistance (stability) - resistance threshold
MW 5x15 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.48 kg / 480.0 g 4.7 N	OK
40 °C	-2.2%	0.47 kg / 469.4 g 4.6 N	OK
60 °C	-4.4%	0.46 kg / 458.9 g 4.5 N	OK
80 °C	-6.6%	0.45 kg / 448.3 g 4.4 N
100 °C	-28.8%	0.34 kg / 341.8 g 3.4 N

Ordinary NdFeB products irreversibly lose power after exceeding the maximum temperature. Avoid high temperatures – high temperature can permanently destroy this product. As the temperature rises, the magnet's capacity temporarily decreases. Avoid using this magnet close to heaters higher than its safe range. Too high temperature will lead to permanent loss of magnetism.

*Engineering note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than long magnets. The danger warning in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 5x15 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	4.49 kg / 4491 g 44.1 N 6 154 Gs	N/A
1 mm	2.91 kg / 2912 g 28.6 N 9 810 Gs	2.62 kg / 2621 g 25.7 N ~0 Gs
2 mm	1.77 kg / 1769 g 17.4 N 7 646 Gs	1.59 kg / 1592 g 15.6 N ~0 Gs
3 mm	1.05 kg / 1046 g 10.3 N 5 880 Gs	0.94 kg / 942 g 9.2 N ~0 Gs
5 mm	0.37 kg / 372 g 3.7 N 3 507 Gs	0.34 kg / 335 g 3.3 N ~0 Gs
10 mm	0.04 kg / 45 g 0.4 N 1 213 Gs	0.04 kg / 40 g 0.4 N ~0 Gs
20 mm	0.00 kg / 3 g 0.0 N 309 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 37 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two strong neodymiums attract each other from a wider radius than a magnet and steel setup. The connection of magnet-to-magnet generates a stronger field and a further horizon of performance. Designing a solid fastener? Use a pair of magnets instead of one magnet and a steel. Be careful that when bringing together two magnets, the pinch force is massive. The repulsion force is a bit weaker than the connection force, but still impressive.
*Field value in repulsion mode is approximately ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).

Table 7: Hazards (electronics) - precautionary measures
MW 5x15 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	4.5 cm
Hearing aid	10 Gs (1.0 mT)	3.5 cm
Mechanical watch	20 Gs (2.0 mT)	2.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	2.0 cm
Remote	50 Gs (5.0 mT)	2.0 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Powerful magnet radiation poses a large risk to electronics as well as pacemakers. These magnets produce a field that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation acts through matter and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
MW 5x15 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	14.87 km/h (4.13 m/s)	0.02 J
30 mm	25.74 km/h (7.15 m/s)	0.06 J
50 mm	33.23 km/h (9.23 m/s)	0.09 J
100 mm	47.00 km/h (13.06 m/s)	0.19 J

Magnetic elements are prone to chipping – a violent impact against metal can result in shattering. Control the attraction moment – a neodymium left loose speeds with massive force. Impact energy can cause material chips or injury to skin. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear eye protection when working with large magnets.

Table 9: Anti-corrosion coating durability
MW 5x15 / N38

Technical parameter	Value / Description
Coating type	[NiCuNi] Nickel
Layer structure	Nickel - Copper - Nickel
Layer thickness	10-20 µm
Salt spray test (SST) ?	24 h
Recommended environment	Indoors only (dry)

The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 10: Construction data (P_c)
MW 5x15 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	1 382 Mx	13.8 µWb
P_c Coefficient	1.38	High (Stable)

Total magnetic flux passing through the magnet pole. Key data in coil applications as well as sensors. The P_c coefficient defines the working geometry.

Table 11: Physics of underwater searching
MW 5x15 / N38

Environment	Effective steel pull	Effect
Air (land)	0.48 kg	Standard
Water (riverbed)	0.55 kg (+0.07 kg Buoyancy gain)	+14.5%

Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains only ~20% of its max power.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.

3. Heat tolerance

*For N38 grade, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 1.38

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The P_c (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher P_c value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical specification and ecology

Chemical composition

iron (Fe)	64% – 68%
neodymium (Nd)	29% – 32%
boron (B)	1.1% – 1.2%
dysprosium (Dy)	0.5% – 2.0%
coating (Ni-Cu-Ni)	< 0.05%

Ecology and recycling (GPSR)

recyclability (EoL)	100%
recycled raw materials	~10% (pre-cons)
carbon footprint	low / zredukowany
waste code (EWC)	16 02 16

Safety card (GPSR)

responsible entity

Dhit sp. z o.o.

ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki

tel: +48 22 499 98 98 | e-mail: bok@dhit.pl

batch number/type

id: 010084-2025

Quick Unit Converter

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Force (N)

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The presented product is an exceptionally strong rod magnet, composed of advanced NdFeB material, which, with dimensions of Ø5x15 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and industrial build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with significant force (approx. 0.48 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.

This model is ideal for building electric motors, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 4.68 N with a weight of only 2.21 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.

Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.

Grade N38 is the most popular standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø5x15), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.

This model is characterized by dimensions Ø5x15 mm, which, at a weight of 2.21 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 0.48 kg (force ~4.68 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.

This cylinder is magnetized axially (along the height of 15 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized through the diameter if your project requires it.

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:

They do not lose power, even over approximately 10 years – the reduction in power is only ~1% (theoretically),
Magnets effectively protect themselves against demagnetization caused by foreign field sources,
The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
Thanks to the ability of flexible shaping and adaptation to custom projects, magnetic components can be created in a broad palette of forms and dimensions, which amplifies use scope,
Significant place in modern technologies – they serve a role in hard drives, motor assemblies, diagnostic systems, as well as industrial machines.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems

Limitations

Problematic aspects of neodymium magnets: application proposals

Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
Due to limitations in realizing nuts and complicated forms in magnets, we propose using cover - magnetic mount.
Potential hazard related to microscopic parts of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these products are able to complicate diagnosis medical after entering the body.
With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum magnetic pulling force – what contributes to it?

The load parameter shown represents the limit force, measured under ideal test conditions, meaning:

on a base made of mild steel, perfectly concentrating the magnetic field
possessing a massiveness of min. 10 mm to ensure full flux closure
with an ideally smooth touching surface
under conditions of ideal adhesion (metal-to-metal)
for force applied at a right angle (pull-off, not shear)
at ambient temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Real force is influenced by working environment parameters, including (from most important):

Distance – the presence of any layer (paint, dirt, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
Material composition – different alloys attracts identically. High carbon content weaken the attraction effect.
Base smoothness – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
Temperature – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate lowers the holding force.

H&S for magnets

Handling guide

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Demagnetization risk

Monitor thermal conditions. Exposing the magnet to high heat will ruin its properties and strength.

Protect data

Avoid bringing magnets close to a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Magnets are brittle

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. Wear goggles.

Machining danger

Combustion risk: Neodymium dust is explosive. Avoid machining magnets in home conditions as this may cause fire.

GPS Danger

A strong magnetic field interferes with the functioning of magnetometers in phones and GPS navigation. Maintain magnets near a smartphone to prevent damaging the sensors.

Pacemakers

For implant holders: Strong magnetic fields affect medical devices. Maintain at least 30 cm distance or ask another person to handle the magnets.

Hand protection

Big blocks can crush fingers in a fraction of a second. Under no circumstances put your hand between two strong magnets.

Metal Allergy

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, avoid direct skin contact and opt for coated magnets.

Swallowing risk

Only for adults. Small elements can be swallowed, causing intestinal necrosis. Keep out of reach of children and animals.

Security! Want to know more? Read our article: Why are neodymium magnets dangerous?

MW 5x15 / N38 - cylindrical magnet

Technical of the product - MW 5x15 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the assembly - report

Table 1: Static force (force vs gap) - power drop MW 5x15 / N38

Table 2: Slippage capacity (wall) MW 5x15 / N38

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces MW 5x15 / N38

Table 4: Material efficiency (saturation) - sheet metal selection MW 5x15 / N38

Table 5: Thermal resistance (stability) - resistance threshold MW 5x15 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range MW 5x15 / N38

Table 7: Hazards (electronics) - precautionary measures MW 5x15 / N38

Table 8: Impact energy (kinetic energy) - collision effects MW 5x15 / N38

Table 9: Anti-corrosion coating durability MW 5x15 / N38

Table 10: Construction data (Pc) MW 5x15 / N38

Table 11: Physics of underwater searching MW 5x15 / N38

1. Wall mount (shear)

2. Steel thickness impact

3. Heat tolerance

4. Demagnetization curve and operating point (B-H)

Chemical composition

Ecology and recycling (GPSR)

Force (pull)

Field Strength

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MW 2x10 / N38 - cylindrical magnet

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UMT 12x20 blue / N38 - board holder

Strengths as well as weaknesses of Nd2Fe14B magnets.

Advantages

Limitations

Holding force characteristics

Maximum magnetic pulling force – what contributes to it?

Lifting capacity in practice – influencing factors

H&S for magnets

Handling guide

Demagnetization risk

Protect data

Magnets are brittle

Machining danger

GPS Danger

Pacemakers

Hand protection

Metal Allergy

Swallowing risk

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs gap) - power drop
MW 5x15 / N38

Table 2: Slippage capacity (wall)
MW 5x15 / N38

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 5x15 / N38

Table 4: Material efficiency (saturation) - sheet metal selection
MW 5x15 / N38

Table 5: Thermal resistance (stability) - resistance threshold
MW 5x15 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 5x15 / N38

Table 7: Hazards (electronics) - precautionary measures
MW 5x15 / N38

Table 8: Impact energy (kinetic energy) - collision effects
MW 5x15 / N38

Table 9: Anti-corrosion coating durability
MW 5x15 / N38

Table 10: Construction data (P_c)
MW 5x15 / N38

Table 11: Physics of underwater searching
MW 5x15 / N38

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.