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MW 4x8 / 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 010079

GTIN/EAN: 5906301810780

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

0.75 g

Magnetization Direction

↑ axial

Load capacity

0.35 kg / 3.48 N

Magnetic Induction

599.59 mT / 5996 Gs

Coating

[NiCuNi] Nickel

view specifications »

0.701 ZŁ with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Technical data - MW 4x8 / N38 - cylindrical magnet

Specification / characteristics - MW 4x8 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010079
GTIN/EAN	5906301810780
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	4 mm [±0,1 mm]
Height	8 mm [±0,1 mm]
Weight	0.75 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.35 kg / 3.48 N
Magnetic Induction ~ ?	599.59 mT / 5996 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x8 / 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

Engineering analysis of the magnet - technical parameters

These values are the result of a engineering analysis. Results rely on models for the class Nd₂Fe₁₄B. Actual conditions might slightly deviate from the simulation results. Please consider these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (pull vs gap) - interaction chart
MW 4x8 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5984 Gs 598.4 mT	0.35 kg / 350.0 g 3.4 N	weak grip
1 mm	3280 Gs 328.0 mT	0.11 kg / 105.1 g 1.0 N	weak grip
2 mm	1696 Gs 169.6 mT	0.03 kg / 28.1 g 0.3 N	weak grip
3 mm	941 Gs 94.1 mT	0.01 kg / 8.7 g 0.1 N	weak grip
5 mm	371 Gs 37.1 mT	0.00 kg / 1.3 g 0.0 N	weak grip
10 mm	82 Gs 8.2 mT	0.00 kg / 0.1 g 0.0 N	weak grip
15 mm	31 Gs 3.1 mT	0.00 kg / 0.0 g 0.0 N	weak grip
20 mm	15 Gs 1.5 mT	0.00 kg / 0.0 g 0.0 N	weak grip
30 mm	5 Gs 0.5 mT	0.00 kg / 0.0 g 0.0 N	weak grip
50 mm	1 Gs 0.1 mT	0.00 kg / 0.0 g 0.0 N	weak grip

Pulling power decreases sharply per each millimeter of spacing. Keep in mind that every additional insulation layer (e.g., dirt, varnish, rust) noticeably reduces the pull force. Neodymiums operate strongest at the point of direct contact; air break kills the force. Analyze how rapidly the load capacity drop, when the magnet does not touch tightly to the steel surface. When calculating the arrangement, avoid unnecessary gaps.

Table 2: Slippage load (vertical surface)
MW 4x8 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.07 kg / 70.0 g 0.7 N
1 mm	Stal (~0.2)	0.02 kg / 22.0 g 0.2 N
2 mm	Stal (~0.2)	0.01 kg / 6.0 g 0.1 N
3 mm	Stal (~0.2)	0.00 kg / 2.0 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

The table below shows the theoretical holding capacity sufficient to cause the downward movement of the magnet down against a vertical steel plate (assuming standard friction). The holding force depends on the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 4x8 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.11 kg / 105.0 g 1.0 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.07 kg / 70.0 g 0.7 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.03 kg / 35.0 g 0.3 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.18 kg / 175.0 g 1.7 N

When hanging a holder on a vertical wall (e.g., a fridge), it will maintain just approx. 20%-30% of its nominal power. Gravitational force as well as a weak degree of grip mean that holders slip easier than they pull off. Want to create a wall mount? Consider that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the element will slide down under a significantly smaller load. Utilizing a rubberized pad can significantly improve the result.

Table 4: Steel thickness (saturation) - power losses
MW 4x8 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.03 kg / 35.0 g 0.3 N
1 mm	25%	0.09 kg / 87.5 g 0.9 N
2 mm	50%	0.18 kg / 175.0 g 1.7 N
5 mm	100%	0.35 kg / 350.0 g 3.4 N
10 mm	100%	0.35 kg / 350.0 g 3.4 N

A too thin steel is unable to focus the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a weak sheet, the field will pass right through and the holding will be smaller. To achieve full efficiency of this neodymium's power, you need a suitably thick piece of steel. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the magnet holds weaker. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal resistance (material behavior) - thermal limit
MW 4x8 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.35 kg / 350.0 g 3.4 N	OK
40 °C	-2.2%	0.34 kg / 342.3 g 3.4 N	OK
60 °C	-4.4%	0.33 kg / 334.6 g 3.3 N	OK
80 °C	-6.6%	0.33 kg / 326.9 g 3.2 N
100 °C	-28.8%	0.25 kg / 249.2 g 2.4 N

Ordinary NdFeB products change their properties parameters past the thermal threshold. Avoid high temperatures – excessive heat can irreversibly damage this magnet. With increasing heat, the neodymium's capacity momentarily decreases. Avoid using this magnet close to ovens exceeding its working range. Too high temperature will result in irreversible degradation of magnetism.

*Technical advisory: Heat tolerance is determined by both grade, as well as the dimension ratios. Flat magnets (pancake types) are more susceptible to demagnetization at lower temperatures than taller cylinders. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MW 4x8 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	2.77 kg / 2774 g 27.2 N 6 121 Gs	N/A
1 mm	1.59 kg / 1591 g 15.6 N 9 063 Gs	1.43 kg / 1432 g 14.0 N ~0 Gs
2 mm	0.83 kg / 833 g 8.2 N 6 559 Gs	0.75 kg / 750 g 7.4 N ~0 Gs
3 mm	0.43 kg / 427 g 4.2 N 4 694 Gs	0.38 kg / 384 g 3.8 N ~0 Gs
5 mm	0.12 kg / 121 g 1.2 N 2 498 Gs	0.11 kg / 109 g 1.1 N ~0 Gs
10 mm	0.01 kg / 11 g 0.1 N 743 Gs	0.01 kg / 10 g 0.1 N ~0 Gs
20 mm	0.00 kg / 1 g 0.0 N 165 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 17 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two strong neodymiums interact from a significantly greater distance than a magnet and sheet setup. The setup of two magnets generates a stronger field and a larger range of performance. Designing a solid fastener? Apply two magnets instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the pinch force is extreme. The levitation is marginally weaker than the attraction, but still impressive.
*Flux density in repulsion mode drops to ~0 Gs at the geometric center of the gap (resulting from vector opposition).

Table 7: Protective zones (electronics) - warnings
MW 4x8 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	3.5 cm
Hearing aid	10 Gs (1.0 mT)	2.5 cm
Mechanical watch	20 Gs (2.0 mT)	2.0 cm
Mobile device	40 Gs (4.0 mT)	1.5 cm
Remote	50 Gs (5.0 mT)	1.5 cm
Payment card	400 Gs (40.0 mT)	0.5 cm
HDD hard drive	600 Gs (60.0 mT)	0.5 cm

A strong magnetic field poses a large risk to electronics as well as medical implants. These NdFeB products produce a flux that destroys function of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and glass. Exceptional care must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MW 4x8 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	21.79 km/h (6.05 m/s)	0.01 J
30 mm	37.74 km/h (10.48 m/s)	0.04 J
50 mm	48.72 km/h (13.53 m/s)	0.07 J
100 mm	68.89 km/h (19.14 m/s)	0.14 J

Neodymium magnets 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. Kinetic force can cause material chips or painful pinches to skin. Be sure to control the product during installation so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear eye protection when playing with large magnets.

Table 9: Surface protection spec
MW 4x8 / 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)

Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MW 4x8 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	836 Mx	8.4 µWb
P_c Coefficient	1.21	High (Stable)

Total magnetic flux emitted by the magnet pole. Essential parameter for generator designers as well as sensors. The P_c coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
MW 4x8 / N38

Environment	Effective steel pull	Effect
Air (land)	0.35 kg	Standard
Water (riverbed)	0.40 kg (+0.05 kg Buoyancy gain)	+14.5%

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

Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Shear force

*Note: On a vertical wall, the magnet holds only approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. computer case) drastically limits the holding force.

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 1.21

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

Material specification

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%

Environmental data

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: 010079-2025

Magnet Unit Converter

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MW 9x3 / N38 - cylindrical magnet

1.132 ZŁ brutto / pcs

Product available Ships tomorrow

MPL 40x7x3 / N38 - lamellar magnet

2.79 ZŁ brutto / pcs

Product available Ships tomorrow

MW 80x30 / N38 - cylindrical magnet

415.00 ZŁ brutto / pcs

Product available Ships tomorrow

MW 5x15 / N38 - cylindrical magnet

1.107 ZŁ brutto / pcs

The offered product is a very strong cylinder magnet, produced from advanced NdFeB material, which, with dimensions of Ø4x8 mm, guarantees the highest energy density. This specific item features an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 0.35 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

This model is perfect for building generators, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 3.48 N with a weight of only 0.75 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.

Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.

Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø4x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.

The presented product is a neodymium magnet with precisely defined parameters: diameter 4 mm and height 8 mm. The key parameter here is the lifting capacity amounting to approximately 0.35 kg (force ~3.48 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.

This rod magnet is magnetized axially (along the height of 8 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard 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.

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.

Strengths

Apart from their superior holding force, neodymium magnets have these key benefits:

They do not lose strength, even after nearly ten years – the reduction in power is only ~1% (theoretically),
Neodymium magnets are exceptionally resistant to magnetic field loss caused by external magnetic fields,
The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
Magnets are distinguished by impressive magnetic induction on the working surface,
Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
Thanks to the option of precise shaping and adaptation to unique projects, NdFeB magnets can be modeled in a variety of forms and dimensions, which expands the range of possible applications,
Versatile presence in electronics industry – they are used in HDD drives, drive modules, advanced medical instruments, also multitasking production systems.
Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of NdFeB magnets:

Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
Limited ability of making nuts in the magnet and complex forms - preferred is casing - magnet mounting.
Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these products can complicate diagnosis medical when they are in the body.
Due to neodymium price, their price is relatively high,

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what affects it?

The force parameter is a theoretical maximum value performed under the following configuration:

with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
whose thickness equals approx. 10 mm
characterized by smoothness
with total lack of distance (no coatings)
for force applied at a right angle (in the magnet axis)
in stable room temperature

What influences lifting capacity in practice

During everyday use, the actual holding force depends on several key aspects, listed from the most important:

Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
Direction of force – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
Base massiveness – too thin steel does not close the flux, causing part of the flux to be lost to the other side.
Material type – the best choice is high-permeability steel. Hardened steels may attract less.
Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, in contrast under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance between the magnet and the plate lowers the holding force.

H&S for magnets

Dust explosion hazard

Fire hazard: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.

Thermal limits

Regular neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Pacemakers

Health Alert: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

No play value

These products are not intended for children. Eating several magnets may result in them attracting across intestines, which constitutes a critical condition and requires immediate surgery.

Cards and drives

Device Safety: Neodymium magnets can damage data carriers and sensitive devices (pacemakers, hearing aids, mechanical watches).

Finger safety

Pinching hazard: The pulling power is so immense that it can result in blood blisters, pinching, and broken bones. Use thick gloves.

Conscious usage

Be careful. Neodymium magnets act from a distance and connect with huge force, often quicker than you can react.

Fragile material

Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Metal Allergy

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If redness happens, cease handling magnets and wear gloves.

Magnetic interference

Remember: rare earth magnets produce a field that interferes with sensitive sensors. Maintain a safe distance from your mobile, tablet, and GPS.

Warning! Details about risks in the article: Magnet Safety Guide.

MW 4x8 / N38 - cylindrical magnet

Technical data - MW 4x8 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering analysis of the magnet - technical parameters

Table 1: Static pull force (pull vs gap) - interaction chart MW 4x8 / N38

Table 2: Slippage load (vertical surface) MW 4x8 / N38

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces MW 4x8 / N38

Table 4: Steel thickness (saturation) - power losses MW 4x8 / N38

Table 5: Thermal resistance (material behavior) - thermal limit MW 4x8 / N38

Table 6: Two magnets (attraction) - field range MW 4x8 / N38

Table 7: Protective zones (electronics) - warnings MW 4x8 / N38

Table 8: Collisions (kinetic energy) - warning MW 4x8 / N38

Table 9: Surface protection spec MW 4x8 / N38

Table 10: Construction data (Flux) MW 4x8 / N38

Table 11: Underwater work (magnet fishing) MW 4x8 / N38

1. Shear force

2. Steel saturation

3. Temperature resistance

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

Material specification

Environmental data

Force (pull)

Magnetic Induction

See also deals

MW 9x3 / N38 - cylindrical magnet

MPL 40x7x3 / N38 - lamellar magnet

MW 80x30 / N38 - cylindrical magnet

MW 5x15 / N38 - cylindrical magnet

Advantages as well as disadvantages of Nd2Fe14B magnets.

Strengths

Disadvantages

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what affects it?

What influences lifting capacity in practice

H&S for magnets

Dust explosion hazard

Thermal limits

Pacemakers

No play value

Cards and drives

Finger safety

Conscious usage

Fragile material

Metal Allergy

Magnetic interference

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs gap) - interaction chart
MW 4x8 / N38

Table 2: Slippage load (vertical surface)
MW 4x8 / N38

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 4x8 / N38

Table 4: Steel thickness (saturation) - power losses
MW 4x8 / N38

Table 5: Thermal resistance (material behavior) - thermal limit
MW 4x8 / N38

Table 6: Two magnets (attraction) - field range
MW 4x8 / N38

Table 7: Protective zones (electronics) - warnings
MW 4x8 / N38

Table 8: Collisions (kinetic energy) - warning
MW 4x8 / N38

Table 9: Surface protection spec
MW 4x8 / N38

Table 10: Construction data (Flux)
MW 4x8 / N38

Table 11: Underwater work (magnet fishing)
MW 4x8 / N38

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.