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MP 20x8/4x3 / 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: PLN 1-6500
Rating: 5

ring magnet

Catalog no 030187

GTIN/EAN: 5906301812043

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

6.79 g

Magnetization Direction

↑ axial

Load capacity

3.14 kg / 30.79 N

Magnetic Induction

178.11 mT / 1781 Gs

Coating

[NiCuNi] Nickel

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3.59 ZŁ with VAT / pcs + price for transport

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Technical - MP 20x8/4x3 / N38 - ring magnet

Specification / characteristics - MP 20x8/4x3 / N38 - ring magnet

properties

properties	values
Cat. no.	030187
GTIN/EAN	5906301812043
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	20 mm [±0,1 mm]
internal diameter Ø	8/4 mm [±0,1 mm]
Height	3 mm [±0,1 mm]
Weight	6.79 g
Magnetization Direction	↑ axial
Load capacity ~ ?	3.14 kg / 30.79 N
Magnetic Induction ~ ?	178.11 mT / 1781 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8/4x3 / 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 modeling of the assembly - data

These data are the outcome of a mathematical simulation. Results were calculated on models for the material Nd₂Fe₁₄B. Operational performance might slightly differ from theoretical values. Please consider these data as a preliminary roadmap when designing systems.

Table 1: Static force (force vs distance) - power drop
MP 20x8/4x3 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	1531 Gs 153.1 mT	3.14 kg / 6.92 LBS 3140.0 g / 30.8 N	warning
1 mm	1457 Gs 145.7 mT	2.84 kg / 6.27 LBS 2843.2 g / 27.9 N	warning
2 mm	1352 Gs 135.2 mT	2.45 kg / 5.39 LBS 2446.6 g / 24.0 N	warning
3 mm	1227 Gs 122.7 mT	2.02 kg / 4.44 LBS 2016.2 g / 19.8 N	warning
5 mm	963 Gs 96.3 mT	1.24 kg / 2.74 LBS 1241.9 g / 12.2 N	safe
10 mm	465 Gs 46.5 mT	0.29 kg / 0.64 LBS 289.3 g / 2.8 N	safe
15 mm	228 Gs 22.8 mT	0.07 kg / 0.15 LBS 69.7 g / 0.7 N	safe
20 mm	122 Gs 12.2 mT	0.02 kg / 0.04 LBS 20.0 g / 0.2 N	safe
30 mm	45 Gs 4.5 mT	0.00 kg / 0.01 LBS 2.7 g / 0.0 N	safe
50 mm	11 Gs 1.1 mT	0.00 kg / 0.00 LBS 0.2 g / 0.0 N	safe

Pulling power decreases sharply with every subsequent millimeter of gap. Keep in mind that even a microscopic distance (e.g., dirt, varnish, veneer) strongly reduces the pull force. Neodymiums hold most effectively at the point of direct contact; gap drastically cuts the power. Observe how flashily the load capacity plummet, when the magnet does not adhere flatly to the metal substrate. When planning the mounting, avoid additional spacers.

Table 2: Vertical load (wall)
MP 20x8/4x3 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	0.63 kg / 1.38 LBS 628.0 g / 6.2 N
1 mm	Stal (~0.2)	0.57 kg / 1.25 LBS 568.0 g / 5.6 N
2 mm	Stal (~0.2)	0.49 kg / 1.08 LBS 490.0 g / 4.8 N
3 mm	Stal (~0.2)	0.40 kg / 0.89 LBS 404.0 g / 4.0 N
5 mm	Stal (~0.2)	0.25 kg / 0.55 LBS 248.0 g / 2.4 N
10 mm	Stal (~0.2)	0.06 kg / 0.13 LBS 58.0 g / 0.6 N
15 mm	Stal (~0.2)	0.01 kg / 0.03 LBS 14.0 g / 0.1 N
20 mm	Stal (~0.2)	0.00 kg / 0.01 LBS 4.0 g / 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.00 LBS 0.0 g / 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 LBS 0.0 g / 0.0 N

The following data presents the estimated holding capacity necessary to initiate the slippage of the magnet vertically against a upright metal surface (assuming typical friction coefficient). The holding force varies with the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 20x8/4x3 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.94 kg / 2.08 LBS 942.0 g / 9.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.63 kg / 1.38 LBS 628.0 g / 6.2 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.31 kg / 0.69 LBS 314.0 g / 3.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.57 kg / 3.46 LBS 1570.0 g / 15.4 N

When placing a magnet on a upright plane (e.g., a board), it will only hold only about 1/5 of nominal attraction strength. Gravity and a weak degree of grip influence the fact that magnets move down faster than they pull off. Planning a wall mount? Consider that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a significantly smaller weight. Application of an anti-slip pad can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MP 20x8/4x3 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.31 kg / 0.69 LBS 314.0 g / 3.1 N
1 mm	25%	0.79 kg / 1.73 LBS 785.0 g / 7.7 N
2 mm	50%	1.57 kg / 3.46 LBS 1570.0 g / 15.4 N
3 mm	75%	2.36 kg / 5.19 LBS 2355.0 g / 23.1 N
5 mm	100%	3.14 kg / 6.92 LBS 3140.0 g / 30.8 N
10 mm	100%	3.14 kg / 6.92 LBS 3140.0 g / 30.8 N
11 mm	100%	3.14 kg / 6.92 LBS 3140.0 g / 30.8 N
12 mm	100%	3.14 kg / 6.92 LBS 3140.0 g / 30.8 N

A thin metal plate is unable to take in the entire magnetic field, which wastes potential of the magnet. If you attach a powerful product to a too thin substrate, the flux will penetrate right through and the attraction force will be weaker. To squeeze the maximum of this magnet's power, you require a sufficiently solid piece of metal. The saturation phenomenon causes that on thin elements (e.g., thin profiles), the product shows lower pull force. We suggest choosing the steel thickness from these parameters.

Table 5: Thermal resistance (stability) - thermal limit
MP 20x8/4x3 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	3.14 kg / 6.92 LBS 3140.0 g / 30.8 N	OK
40 °C	-2.2%	3.07 kg / 6.77 LBS 3070.9 g / 30.1 N	OK
60 °C	-4.4%	3.00 kg / 6.62 LBS 3001.8 g / 29.4 N
80 °C	-6.6%	2.93 kg / 6.47 LBS 2932.8 g / 28.8 N
100 °C	-28.8%	2.24 kg / 4.93 LBS 2235.7 g / 21.9 N

Ordinary NdFeB products change their properties power after exceeding the maximum temperature. Watch out for overheating – heat can permanently demagnetize this magnet. With increasing heat, the magnet's power briefly decreases. Refrain from using this product near heat sources higher than its safe range. Ignoring the limit will result in destruction of magnetism.

*Important note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) may lose charge permanently at lower temperatures than taller cylinders. The danger warning in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MP 20x8/4x3 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Shear Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	3.71 kg / 8.17 LBS 2 815 Gs	0.56 kg / 1.23 LBS 556 g / 5.5 N	N/A
1 mm	3.55 kg / 7.83 LBS 2 998 Gs	0.53 kg / 1.17 LBS 533 g / 5.2 N	3.20 kg / 7.05 LBS ~0 Gs
2 mm	3.36 kg / 7.40 LBS 2 915 Gs	0.50 kg / 1.11 LBS 503 g / 4.9 N	3.02 kg / 6.66 LBS ~0 Gs
3 mm	3.13 kg / 6.90 LBS 2 815 Gs	0.47 kg / 1.04 LBS 470 g / 4.6 N	2.82 kg / 6.21 LBS ~0 Gs
5 mm	2.63 kg / 5.81 LBS 2 582 Gs	0.40 kg / 0.87 LBS 395 g / 3.9 N	2.37 kg / 5.23 LBS ~0 Gs
10 mm	1.47 kg / 3.23 LBS 1 926 Gs	0.22 kg / 0.48 LBS 220 g / 2.2 N	1.32 kg / 2.91 LBS ~0 Gs
20 mm	0.34 kg / 0.75 LBS 930 Gs	0.05 kg / 0.11 LBS 51 g / 0.5 N	0.31 kg / 0.68 LBS ~0 Gs
50 mm	0.01 kg / 0.02 LBS 143 Gs	0.00 kg / 0.00 LBS 1 g / 0.0 N	0.00 kg / 0.00 LBS ~0 Gs
60 mm	0.00 kg / 0.01 LBS 90 Gs	0.00 kg / 0.00 LBS 0 g / 0.0 N	0.00 kg / 0.00 LBS ~0 Gs
70 mm	0.00 kg / 0.00 LBS 59 Gs	0.00 kg / 0.00 LBS 0 g / 0.0 N	0.00 kg / 0.00 LBS ~0 Gs
80 mm	0.00 kg / 0.00 LBS 41 Gs	0.00 kg / 0.00 LBS 0 g / 0.0 N	0.00 kg / 0.00 LBS ~0 Gs
90 mm	0.00 kg / 0.00 LBS 30 Gs	0.00 kg / 0.00 LBS 0 g / 0.0 N	0.00 kg / 0.00 LBS ~0 Gs
100 mm	0.00 kg / 0.00 LBS 22 Gs	0.00 kg / 0.00 LBS 0 g / 0.0 N	0.00 kg / 0.00 LBS ~0 Gs

Two magnets attract each other from a much further distance than a magnet and steel combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of action. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the pinch force is extreme. The repulsion force is a bit weaker than the connection force, but still impressive.
*The magnetic induction for N-N configuration drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Important: Estimates refer to sliding force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - precautionary measures
MP 20x8/4x3 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	7.0 cm
Hearing aid	10 Gs (1.0 mT)	5.5 cm
Timepiece	20 Gs (2.0 mT)	4.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	3.5 cm
Car key	50 Gs (5.0 mT)	3.0 cm
Payment card	400 Gs (40.0 mT)	1.5 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Extremely neodym field is a large risk to electronic devices as well as pacemakers. These neodymiums generate a flux that prevents correct functioning of digital equipment. Remember: the invisible magnetic field acts through matter and plastic. Exceptional care must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, remotes, speakers, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MP 20x8/4x3 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.90 km/h (6.36 m/s)	0.14 J
30 mm	37.58 km/h (10.44 m/s)	0.37 J
50 mm	48.50 km/h (13.47 m/s)	0.62 J
100 mm	68.58 km/h (19.05 m/s)	1.23 J

Magnetic elements are delicate – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely speeds with massive force. Impact energy can destroy the magnet or dangerous crushing to skin. 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 almost guarantees destruction of the magnet. Wear eye protection when working with powerful specimens.

Table 9: Coating parameters (durability)
MP 20x8/4x3 / 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: Electrical data (P_c)
MP 20x8/4x3 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	5 044 Mx	50.4 µWb
P_c Coefficient	0.20	Low (Flat)

Total magnetic flux emitted by the pole surface. Essential parameter when building generators as well as sensors. P_c value determines the magnet's operating point.

Table 11: Submerged application
MP 20x8/4x3 / N38

Environment	Effective steel pull	Effect
Air (land)	3.14 kg	Standard
Water (riverbed)	3.60 kg (+0.46 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.

Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.

1. Sliding resistance

*Note: On a vertical surface, the magnet holds merely approx. 20-30% of its max power.

2. Steel saturation

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Temperature resistance

*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) = 0.20

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

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%

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: 030187-2026

Measurement Calculator

Magnet pull force

Newtons (N)

Force in lbs

Magnetic Induction

Gauss (Gs)

Put a figure in just one field to receive results in the other fields at once.

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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 3.14 kg works great as a cabinet closure, 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 is not sufficient for rain. In the place of the mounting hole, the coating is thinner and can be damaged 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 8/4 mm fits this model. If the magnet does not have a chamfer (cone), we recommend using a screw with a flat or cylindrical head, or possibly using a washer. Aesthetic mounting requires selecting the appropriate head size.

It is a magnetic ring with a diameter of 20 mm and thickness 3 mm. The pulling force of this model is an impressive 3.14 kg, which translates to 30.79 N in newtons. The mounting hole diameter is precisely 8/4 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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages as well as disadvantages of rare earth magnets.

Advantages

In addition to their pulling strength, neodymium magnets provide the following advantages:

They retain attractive force for around ten years – the loss is just ~1% (based on simulations),
They possess excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
Magnets are distinguished by huge magnetic induction on the active area,
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...
Possibility of accurate shaping and adjusting to specific applications,
Significant place in high-tech industry – they are used in hard drives, electromotive mechanisms, diagnostic systems, as well as modern systems.
Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:

To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
We suggest casing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex forms.
Health risk to health – tiny shards of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these devices can complicate diagnosis medical when they are in the body.
With budget limitations the cost of neodymium magnets can be a barrier,

Pull force analysis

Highest magnetic holding force – what it depends on?

Breakaway force was defined for ideal contact conditions, assuming:

on a plate made of mild steel, effectively closing the magnetic flux
with a cross-section no less than 10 mm
with a plane cleaned and smooth
without the slightest insulating layer between the magnet and steel
during pulling in a direction vertical to the plane
in stable room temperature

Lifting capacity in practice – influencing factors

In practice, the real power depends on many variables, presented from the most important:

Distance – existence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
Material type – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate decreases the load capacity.

Precautions when working with neodymium magnets

Beware of splinters

NdFeB magnets are sintered ceramics, which means they are fragile like glass. Clashing of two magnets will cause them shattering into small pieces.

Do not give to children

Product intended for adults. Tiny parts can be swallowed, causing severe trauma. Store away from children and animals.

Permanent damage

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Phone sensors

Be aware: rare earth magnets produce a field that interferes with precision electronics. Keep a safe distance from your mobile, tablet, and GPS.

Powerful field

Handle magnets consciously. Their huge power can surprise even professionals. Plan your moves and respect their power.

Avoid contact if allergic

Certain individuals suffer from a sensitization to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause skin redness. We recommend use safety gloves.

Data carriers

Device Safety: Neodymium magnets can damage payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Finger safety

Watch your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, destroying everything in their path. Be careful!

Pacemakers

People with a heart stimulator must keep an absolute distance from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Fire risk

Drilling and cutting of neodymium magnets carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Caution! Need more info? Check our post: Are neodymium magnets dangerous?

MP 20x8/4x3 / N38 - ring magnet

Technical - MP 20x8/4x3 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the assembly - data

Table 1: Static force (force vs distance) - power drop MP 20x8/4x3 / N38

Table 2: Vertical load (wall) MP 20x8/4x3 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MP 20x8/4x3 / N38

Table 4: Material efficiency (substrate influence) - power losses MP 20x8/4x3 / N38

Table 5: Thermal resistance (stability) - thermal limit MP 20x8/4x3 / N38

Table 6: Two magnets (attraction) - field collision MP 20x8/4x3 / N38

Table 7: Hazards (implants) - precautionary measures MP 20x8/4x3 / N38

Table 8: Dynamics (cracking risk) - warning MP 20x8/4x3 / N38

Table 9: Coating parameters (durability) MP 20x8/4x3 / N38

Table 10: Electrical data (Pc) MP 20x8/4x3 / N38

Table 11: Submerged application MP 20x8/4x3 / N38

1. Sliding resistance

2. Steel saturation

3. Temperature resistance

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

Material specification

Ecology and recycling (GPSR)

Magnet pull force

Magnetic Induction

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Advantages as well as disadvantages of rare earth magnets.

Advantages

Cons

Pull force analysis

Highest magnetic holding force – what it depends on?

Lifting capacity in practice – influencing factors

Precautions when working with neodymium magnets

Beware of splinters

Do not give to children

Permanent damage

Phone sensors

Powerful field

Avoid contact if allergic

Data carriers

Finger safety

Pacemakers

Fire risk

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs distance) - power drop
MP 20x8/4x3 / N38

Table 2: Vertical load (wall)
MP 20x8/4x3 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 20x8/4x3 / N38

Table 4: Material efficiency (substrate influence) - power losses
MP 20x8/4x3 / N38

Table 5: Thermal resistance (stability) - thermal limit
MP 20x8/4x3 / N38

Table 6: Two magnets (attraction) - field collision
MP 20x8/4x3 / N38

Table 7: Hazards (implants) - precautionary measures
MP 20x8/4x3 / N38

Table 8: Dynamics (cracking risk) - warning
MP 20x8/4x3 / N38

Table 9: Coating parameters (durability)
MP 20x8/4x3 / N38

Table 10: Electrical data (P_c)
MP 20x8/4x3 / N38

Table 11: Submerged application
MP 20x8/4x3 / N38