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MP 5x2.7/1.2x5 C / N38 - ring 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

ring magnet

Catalog no 030201

GTIN/EAN: 5906301812180

5.00

Diameter

5 mm [±0,1 mm]

internal diameter Ø

2.7/1.2 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

0.69 g

Magnetization Direction

↑ axial

Load capacity

0.75 kg / 7.31 N

Magnetic Induction

553.14 mT / 5531 Gs

Coating

[NiCuNi] Nickel

see properties »

0.836 ZŁ with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

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Detailed specification - MP 5x2.7/1.2x5 C / N38 - ring magnet

Specification / characteristics - MP 5x2.7/1.2x5 C / N38 - ring magnet

properties

properties	values
Cat. no.	030201
GTIN/EAN	5906301812180
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	5 mm [±0,1 mm]
internal diameter Ø	2.7/1.2 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	0.69 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.75 kg / 7.31 N
Magnetic Induction ~ ?	553.14 mT / 5531 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 5x2.7/1.2x5 C / N38 - ring 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

Engineering analysis of the assembly - technical parameters

These data represent the direct effect of a physical simulation. Values rely on models for the material Nd₂Fe₁₄B. Operational performance might slightly differ from theoretical values. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static force (pull vs gap) - power drop
MP 5x2.7/1.2x5 C / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5322 Gs 532.2 mT	0.75 kg / 750.0 g 7.4 N	safe
1 mm	3295 Gs 329.5 mT	0.29 kg / 287.5 g 2.8 N	safe
2 mm	1883 Gs 188.3 mT	0.09 kg / 93.9 g 0.9 N	safe
3 mm	1098 Gs 109.8 mT	0.03 kg / 31.9 g 0.3 N	safe
5 mm	440 Gs 44.0 mT	0.01 kg / 5.1 g 0.1 N	safe
10 mm	92 Gs 9.2 mT	0.00 kg / 0.2 g 0.0 N	safe
15 mm	33 Gs 3.3 mT	0.00 kg / 0.0 g 0.0 N	safe
20 mm	15 Gs 1.5 mT	0.00 kg / 0.0 g 0.0 N	safe
30 mm	5 Gs 0.5 mT	0.00 kg / 0.0 g 0.0 N	safe
50 mm	1 Gs 0.1 mT	0.00 kg / 0.0 g 0.0 N	safe

Magnetic force decreases sharply per each millimeter of gap. Keep in mind that even a very thin break (e.g., dirt, paint, veneer) noticeably weakens the grip. Neodymiums hold optimally in perfect adhesion; air break weakens the power. See how quickly the load capacity drop, when the magnet does not touch flatly to the metal substrate. When designing the mounting, discard additional spacers.

Table 2: Shear hold (vertical surface)
MP 5x2.7/1.2x5 C / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.15 kg / 150.0 g 1.5 N
1 mm	Stal (~0.2)	0.06 kg / 58.0 g 0.6 N
2 mm	Stal (~0.2)	0.02 kg / 18.0 g 0.2 N
3 mm	Stal (~0.2)	0.01 kg / 6.0 g 0.1 N
5 mm	Stal (~0.2)	0.00 kg / 2.0 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

The following data shows the approximate force required to initiate the sliding of the magnet vertically along a upright steel plate (considering standard friction). This parameter is a function of the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MP 5x2.7/1.2x5 C / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.22 kg / 225.0 g 2.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.15 kg / 150.0 g 1.5 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.08 kg / 75.0 g 0.7 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.38 kg / 375.0 g 3.7 N

When hanging a holder on a upright plane (e.g., a fridge), it you can count on barely about 20%-30% of its maximum pull force. Gravitational force and a weak degree of grip mean that holders move down easier than they pop off the substrate. Planning a hanger? Note that the shear force is much weaker than the maximum static pull force. On a painted metal, the holder will slide down under a much lighter load. Utilizing a rubberized coating can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 5x2.7/1.2x5 C / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.08 kg / 75.0 g 0.7 N
1 mm	25%	0.19 kg / 187.5 g 1.8 N
2 mm	50%	0.38 kg / 375.0 g 3.7 N
5 mm	100%	0.75 kg / 750.0 g 7.4 N
10 mm	100%	0.75 kg / 750.0 g 7.4 N

A too thin steel is not enough to conduct the full magnetic flux, which wastes potential of the holder. If you attach a powerful product to a thin surface, the magnetism will penetrate right through and the pull force will drop sharply. To utilize 100% of this magnet's power, you require a sufficiently solid element of steel. The saturation effect means that on thin elements (e.g., thin profiles), the product shows lower pull force. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MP 5x2.7/1.2x5 C / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.75 kg / 750.0 g 7.4 N	OK
40 °C	-2.2%	0.73 kg / 733.5 g 7.2 N	OK
60 °C	-4.4%	0.72 kg / 717.0 g 7.0 N	OK
80 °C	-6.6%	0.70 kg / 700.5 g 6.9 N
100 °C	-28.8%	0.53 kg / 534.0 g 5.2 N

Standard neodymium magnets irreversibly lose power above the temperature limit. Avoid high temperatures – high temperature can irreversibly destroy this magnet. With increasing heat, the neodymium's force temporarily drops. Refrain from using this magnet in hot environments higher than its working range. Ignoring the limit will lead to permanent loss of magnetic properties.

*Important note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) are more susceptible to demagnetization under lower heat stress than taller cylinders. Red status in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 5x2.7/1.2x5 C / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	2.75 kg / 2747 g 26.9 N 5 924 Gs	N/A
1 mm	1.77 kg / 1768 g 17.3 N 8 541 Gs	1.59 kg / 1592 g 15.6 N ~0 Gs
2 mm	1.05 kg / 1053 g 10.3 N 6 590 Gs	0.95 kg / 948 g 9.3 N ~0 Gs
3 mm	0.60 kg / 604 g 5.9 N 4 992 Gs	0.54 kg / 544 g 5.3 N ~0 Gs
5 mm	0.20 kg / 198 g 1.9 N 2 860 Gs	0.18 kg / 178 g 1.8 N ~0 Gs
10 mm	0.02 kg / 19 g 0.2 N 880 Gs	0.02 kg / 17 g 0.2 N ~0 Gs
20 mm	0.00 kg / 1 g 0.0 N 184 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 16 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnets interact from a wider radius than a magnet and steel combination. Such a system of two magnets creates a more powerful interaction and a wider radius of operation. Want to build a powerful holder? Utilize two neodymiums instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the pinch force is extreme. The repulsion force is slightly lower than the attraction, but still large.
*Field value in repulsion mode is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).

Table 7: Safety (HSE) (electronics) - precautionary measures
MP 5x2.7/1.2x5 C / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	3.0 cm
Hearing aid	10 Gs (1.0 mT)	2.5 cm
Mechanical watch	20 Gs (2.0 mT)	2.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	1.5 cm
Car key	50 Gs (5.0 mT)	1.5 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	0.5 cm

Extremely neodym field poses a large risk to electronics and pacemakers. These magnets produce a flux that disrupts operation of sensitive medical devices. Remember: the unseen radiation acts through matter and plastic. Exceptional care must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MP 5x2.7/1.2x5 C / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	33.26 km/h (9.24 m/s)	0.03 J
30 mm	57.59 km/h (16.00 m/s)	0.09 J
50 mm	74.35 km/h (20.65 m/s)	0.15 J
100 mm	105.14 km/h (29.21 m/s)	0.29 J

Magnetic elements are delicate – a strong collision with metal causes immediate chipping. Watch the impact speed – a neodymium left loose turns into a projectile. Kinetic force can cause material chips or painful pinches to fingers. Be sure to control the product during bringing near metal so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when working with large magnets.

Table 9: Corrosion resistance
MP 5x2.7/1.2x5 C / 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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Electrical data (P_c)
MP 5x2.7/1.2x5 C / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	862 Mx	8.6 µWb
P_c Coefficient	0.83	High (Stable)

Flux value passing through the pole surface. Essential parameter in coil applications and motors. P_c value determines the magnet's operating point.

Table 11: Physics of underwater searching
MP 5x2.7/1.2x5 C / N38

Environment	Effective steel pull	Effect
Air (land)	0.75 kg	Standard
Water (riverbed)	0.86 kg (+0.11 kg Buoyancy gain)	+14.5%

Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Contrary to myths, water does not block the magnetic field. 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)

*Warning: On a vertical wall, the magnet retains only ~20% of its nominal pull.

2. Steel saturation

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

3. Heat tolerance

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.83

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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

Elemental analysis

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%

Sustainability

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: 030201-2025

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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Mounting is clean and reversible, unlike gluing. This product with a force of 0.75 kg works great as a door latch, speaker holder, or spacer element in devices.

This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a flexible washer under the screw head, which will cushion the stresses. Remember: cracking during assembly results from material properties, not a product defect.

These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.

A screw or bolt with a thread diameter smaller than 2.7/1.2 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.

The presented product is a ring magnet with dimensions Ø5 mm (outer diameter) and height 5 mm. The key parameter here is the lifting capacity amounting to approximately 0.75 kg (force ~7.31 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 2.7/1.2 mm.

The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros and cons of Nd₂Fe₁₄B magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

They retain magnetic properties for around 10 years – the drop is just ~1% (in theory),
They do not lose their magnetic properties even under strong external field,
By applying a smooth coating of gold, the element has an modern look,
Magnetic induction on the top side of the magnet remains strong,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
Considering the possibility of accurate shaping and adaptation to unique solutions, NdFeB magnets can be produced in a broad palette of shapes and sizes, which increases their versatility,
Key role in advanced technology sectors – they serve a role in mass storage devices, electric drive systems, medical devices, and other advanced devices.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:

To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
Due to limitations in realizing nuts and complicated forms in magnets, we propose using casing - magnetic mount.
Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Additionally, small elements of these devices can complicate diagnosis medical when they are in the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

The lifting capacity listed is a measurement result conducted under standard conditions:

using a base made of low-carbon steel, serving as a magnetic yoke
whose thickness is min. 10 mm
with a surface cleaned and smooth
under conditions of no distance (metal-to-metal)
for force applied at a right angle (pull-off, not shear)
at room temperature

Lifting capacity in real conditions – factors

Please note that the working load may be lower depending on the following factors, in order of importance:

Distance – the presence of foreign body (rust, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
Steel grade – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
Surface quality – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
Temperature – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was measured by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Safe handling of neodymium magnets

Keep away from electronics

Remember: neodymium magnets produce a field that interferes with sensitive sensors. Keep a separation from your phone, device, and GPS.

Heat warning

Keep cool. NdFeB magnets are susceptible to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Physical harm

Mind your fingers. Two large magnets will snap together instantly with a force of massive weight, destroying anything in their path. Be careful!

Health Danger

Individuals with a ICD must keep an absolute distance from magnets. The magnetic field can stop the functioning of the implant.

Product not for children

Adult use only. Small elements can be swallowed, leading to serious injuries. Keep out of reach of kids and pets.

Do not underestimate power

Handle magnets with awareness. Their powerful strength can shock even experienced users. Plan your moves and respect their force.

Protect data

Very strong magnetic fields can destroy records on payment cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Magnets are brittle

Beware of splinters. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Nickel allergy

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, prevent direct skin contact and select coated magnets.

Machining danger

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Attention! Need more info? Read our article: Why are neodymium magnets dangerous?

MP 5x2.7/1.2x5 C / N38 - ring magnet

Detailed specification - MP 5x2.7/1.2x5 C / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering analysis of the assembly - technical parameters

Table 1: Static force (pull vs gap) - power drop MP 5x2.7/1.2x5 C / N38

Table 2: Shear hold (vertical surface) MP 5x2.7/1.2x5 C / N38

Table 3: Vertical assembly (shearing) - vertical pull MP 5x2.7/1.2x5 C / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection MP 5x2.7/1.2x5 C / N38

Table 5: Thermal resistance (material behavior) - thermal limit MP 5x2.7/1.2x5 C / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system MP 5x2.7/1.2x5 C / N38

Table 7: Safety (HSE) (electronics) - precautionary measures MP 5x2.7/1.2x5 C / N38

Table 8: Collisions (kinetic energy) - warning MP 5x2.7/1.2x5 C / N38

Table 9: Corrosion resistance MP 5x2.7/1.2x5 C / N38

Table 10: Electrical data (Pc) MP 5x2.7/1.2x5 C / N38

Table 11: Physics of underwater searching MP 5x2.7/1.2x5 C / N38

1. Wall mount (shear)

2. Steel saturation

3. Heat tolerance

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

Elemental analysis

Sustainability

Pulling force

Field Strength

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Pros and cons of Nd2Fe14B magnets.

Pros

Weaknesses

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

Lifting capacity in real conditions – factors

Safe handling of neodymium magnets

Keep away from electronics

Heat warning

Physical harm

Health Danger

Product not for children

Do not underestimate power

Protect data

Magnets are brittle

Nickel allergy

Machining danger

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (pull vs gap) - power drop
MP 5x2.7/1.2x5 C / N38

Table 2: Shear hold (vertical surface)
MP 5x2.7/1.2x5 C / N38

Table 3: Vertical assembly (shearing) - vertical pull
MP 5x2.7/1.2x5 C / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 5x2.7/1.2x5 C / N38

Table 5: Thermal resistance (material behavior) - thermal limit
MP 5x2.7/1.2x5 C / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 5x2.7/1.2x5 C / N38

Table 7: Safety (HSE) (electronics) - precautionary measures
MP 5x2.7/1.2x5 C / N38

Table 8: Collisions (kinetic energy) - warning
MP 5x2.7/1.2x5 C / N38

Table 9: Corrosion resistance
MP 5x2.7/1.2x5 C / N38

Table 10: Electrical data (P_c)
MP 5x2.7/1.2x5 C / N38

Table 11: Physics of underwater searching
MP 5x2.7/1.2x5 C / N38

Pros and cons of Nd₂Fe₁₄B magnets.