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MP 20x8/4x5 / 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 030333

GTIN/EAN: 5906301812272

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

11.31 g

Magnetization Direction

↑ axial

Load capacity

6.65 kg / 65.21 N

Magnetic Induction

277.16 mT / 2772 Gs

Coating

[NiCuNi] Nickel

see technical data »

7.75 ZŁ with VAT / pcs + price for transport

6.30 ZŁ net + 23% VAT / pcs

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Product card - MP 20x8/4x5 / N38 - ring magnet

Specification / characteristics - MP 20x8/4x5 / N38 - ring magnet

properties

properties	values
Cat. no.	030333
GTIN/EAN	5906301812272
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	5 mm [±0,1 mm]
Weight	11.31 g
Magnetization Direction	↑ axial
Load capacity ~ ?	6.65 kg / 65.21 N
Magnetic Induction ~ ?	277.16 mT / 2772 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8/4x5 / 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

Physical simulation of the magnet - data

Presented information constitute the outcome of a engineering simulation. Values are based on models for the material Nd₂Fe₁₄B. Real-world performance might slightly differ. Treat these data as a supplementary guide for designers.

Table 1: Static force (pull vs gap) - characteristics
MP 20x8/4x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	2424 Gs 242.4 mT	6.65 kg / 14.66 lbs 6650.0 g / 65.2 N	strong
1 mm	2265 Gs 226.5 mT	5.81 kg / 12.80 lbs 5807.9 g / 57.0 N	strong
2 mm	2070 Gs 207.0 mT	4.85 kg / 10.69 lbs 4851.0 g / 47.6 N	strong
3 mm	1858 Gs 185.8 mT	3.91 kg / 8.61 lbs 3906.5 g / 38.3 N	strong
5 mm	1437 Gs 143.7 mT	2.34 kg / 5.16 lbs 2338.7 g / 22.9 N	strong
10 mm	691 Gs 69.1 mT	0.54 kg / 1.19 lbs 540.5 g / 5.3 N	low risk
15 mm	343 Gs 34.3 mT	0.13 kg / 0.29 lbs 133.3 g / 1.3 N	low risk
20 mm	186 Gs 18.6 mT	0.04 kg / 0.09 lbs 39.3 g / 0.4 N	low risk
30 mm	70 Gs 7.0 mT	0.01 kg / 0.01 lbs 5.5 g / 0.1 N	low risk
50 mm	18 Gs 1.8 mT	0.00 kg / 0.00 lbs 0.4 g / 0.0 N	low risk

Pulling power decreases drastically with every mm of distance. Remember that every additional insulation layer (e.g., dirt, varnish, veneer) significantly weakens the grip. Neodymiums operate optimally at the point of direct contact; distance drastically cuts the force. See how rapidly the parameters fall, when the magnet does not adhere directly to the metal substrate. When planning the assembly, discard additional spacers.

Table 2: Vertical force (wall)
MP 20x8/4x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	1.33 kg / 2.93 lbs 1330.0 g / 13.0 N
1 mm	Stal (~0.2)	1.16 kg / 2.56 lbs 1162.0 g / 11.4 N
2 mm	Stal (~0.2)	0.97 kg / 2.14 lbs 970.0 g / 9.5 N
3 mm	Stal (~0.2)	0.78 kg / 1.72 lbs 782.0 g / 7.7 N
5 mm	Stal (~0.2)	0.47 kg / 1.03 lbs 468.0 g / 4.6 N
10 mm	Stal (~0.2)	0.11 kg / 0.24 lbs 108.0 g / 1.1 N
15 mm	Stal (~0.2)	0.03 kg / 0.06 lbs 26.0 g / 0.3 N
20 mm	Stal (~0.2)	0.01 kg / 0.02 lbs 8.0 g / 0.1 N
30 mm	Stal (~0.2)	0.00 kg / 0.00 lbs 2.0 g / 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 lbs 0.0 g / 0.0 N

The table below presents the theoretical force needed to cause the shifting of the magnet down against a vertical steel wall (assuming typical friction coefficient). The holding force is a function of the distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MP 20x8/4x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.00 kg / 4.40 lbs 1995.0 g / 19.6 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.33 kg / 2.93 lbs 1330.0 g / 13.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.67 kg / 1.47 lbs 665.0 g / 6.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.33 kg / 7.33 lbs 3325.0 g / 32.6 N

When placing a magnet on a vertical wall (e.g., a board), it will maintain just approx. 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip mean that holders move down faster than they detach. Planning a hanger? Note that the shear force is much weaker than the maximum static pull force. On a painted metal, the magnet will give way down under a noticeably lighter cargo. Application of an anti-slip coating can significantly increase the grip.

Table 4: Steel thickness (substrate influence) - power losses
MP 20x8/4x5 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.67 kg / 1.47 lbs 665.0 g / 6.5 N
1 mm	25%	1.66 kg / 3.67 lbs 1662.5 g / 16.3 N
2 mm	50%	3.33 kg / 7.33 lbs 3325.0 g / 32.6 N
3 mm	75%	4.99 kg / 11.00 lbs 4987.5 g / 48.9 N
5 mm	100%	6.65 kg / 14.66 lbs 6650.0 g / 65.2 N
10 mm	100%	6.65 kg / 14.66 lbs 6650.0 g / 65.2 N
11 mm	100%	6.65 kg / 14.66 lbs 6650.0 g / 65.2 N
12 mm	100%	6.65 kg / 14.66 lbs 6650.0 g / 65.2 N

A thin metal plate is unable to focus the entire magnetic field, which weakens actual performance of the holder. Should you mount a strong magnet to a too thin substrate, the field will penetrate right through and the attraction force will be weaker. To utilize 100% of this neodymium's power, you require a sufficiently solid element of steel. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the holder shows lower pull force. We suggest choosing the steel dimension based on the following data.

Table 5: Thermal resistance (material behavior) - resistance threshold
MP 20x8/4x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	6.65 kg / 14.66 lbs 6650.0 g / 65.2 N	OK
40 °C	-2.2%	6.50 kg / 14.34 lbs 6503.7 g / 63.8 N	OK
60 °C	-4.4%	6.36 kg / 14.02 lbs 6357.4 g / 62.4 N
80 °C	-6.6%	6.21 kg / 13.69 lbs 6211.1 g / 60.9 N
100 °C	-28.8%	4.73 kg / 10.44 lbs 4734.8 g / 46.4 N

Classic neodymiums change their properties parameters above the temperature limit. Avoid high temperatures – heat can irreversibly damage this product. With increasing heat, the magnet's force briefly decreases. Do not use this magnet close to ovens higher than its operating temperature limit. Exceeding the critical threshold will result in permanent loss of magnetism.

*Engineering note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Thin magnets (low Pc) are more susceptible to demagnetization under lower heat stress compared to rod magnets. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 20x8/4x5 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Sliding Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	9.28 kg / 20.47 lbs 4 012 Gs	1.39 kg / 3.07 lbs 1393 g / 13.7 N	N/A
1 mm	8.73 kg / 19.25 lbs 4 701 Gs	1.31 kg / 2.89 lbs 1310 g / 12.8 N	7.86 kg / 17.33 lbs ~0 Gs
2 mm	8.11 kg / 17.88 lbs 4 530 Gs	1.22 kg / 2.68 lbs 1216 g / 11.9 N	7.30 kg / 16.09 lbs ~0 Gs
3 mm	7.45 kg / 16.42 lbs 4 342 Gs	1.12 kg / 2.46 lbs 1117 g / 11.0 N	6.70 kg / 14.78 lbs ~0 Gs
5 mm	6.10 kg / 13.45 lbs 3 930 Gs	0.92 kg / 2.02 lbs 915 g / 9.0 N	5.49 kg / 12.11 lbs ~0 Gs
10 mm	3.27 kg / 7.20 lbs 2 875 Gs	0.49 kg / 1.08 lbs 490 g / 4.8 N	2.94 kg / 6.48 lbs ~0 Gs
20 mm	0.75 kg / 1.66 lbs 1 382 Gs	0.11 kg / 0.25 lbs 113 g / 1.1 N	0.68 kg / 1.50 lbs ~0 Gs
50 mm	0.02 kg / 0.04 lbs 220 Gs	0.00 kg / 0.01 lbs 3 g / 0.0 N	0.02 kg / 0.04 lbs ~0 Gs
60 mm	0.01 kg / 0.02 lbs 139 Gs	0.00 kg / 0.00 lbs 1 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs
70 mm	0.00 kg / 0.01 lbs 93 Gs	0.00 kg / 0.00 lbs 1 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs
80 mm	0.00 kg / 0.00 lbs 65 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 47 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 35 Gs	0.00 kg / 0.00 lbs 0 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs

Two strong neodymiums interact from a significantly greater distance than a magnet and steel setup. The setup of magnet-to-magnet generates a stronger field and a wider radius of operation. Want to build a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is massive. The repulsion force is slightly lower than the connection force, but still significant.
*Flux density in repulsion mode drops to ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Attention: Calculations apply to friction force of a pair of identical magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - precautionary measures
MP 20x8/4x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	8.0 cm
Hearing aid	10 Gs (1.0 mT)	6.5 cm
Timepiece	20 Gs (2.0 mT)	5.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	4.0 cm
Remote	50 Gs (5.0 mT)	3.5 cm
Payment card	400 Gs (40.0 mT)	1.5 cm
HDD hard drive	600 Gs (60.0 mT)	1.5 cm

Extremely neodym field poses a real danger to IT equipment and medical implants. These NdFeB products produce a field that disrupts operation of digital equipment. Notice: the invisible magnetic field penetrates the body and housings. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MP 20x8/4x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	25.67 km/h (7.13 m/s)	0.29 J
30 mm	42.38 km/h (11.77 m/s)	0.78 J
50 mm	54.68 km/h (15.19 m/s)	1.30 J
100 mm	77.33 km/h (21.48 m/s)	2.61 J

Magnetic elements are delicate – a collision with steel can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy can trigger coating fragments or dangerous crushing to fingers. Hold the magnet firmly 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 working with powerful specimens.

Table 9: Coating parameters (durability)
MP 20x8/4x5 / 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 following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MP 20x8/4x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	7 218 Mx	72.2 µWb
P_c Coefficient	0.31	Low (Flat)

Total magnetic flux passing through the magnet pole. Key data in coil applications and motors. P_c value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MP 20x8/4x5 / N38

Environment	Effective steel pull	Effect
Air (land)	6.65 kg	Standard
Water (riverbed)	7.61 kg (+0.96 kg buoyancy gain)	+14.5%

Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds merely a fraction of its perpendicular strength.

2. Efficiency vs thickness

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

3. Power loss vs temp

*For N38 grade, 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) = 0.31

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.

Engineering data and GPSR

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%

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: 030333-2026

Magnet Unit Converter

Pulling force

lbs

Magnetic Induction

Tesla (T)

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MP 20x8/4x5 / N38 - ring magnet

7.75 ZŁ brutto / pcs

The ring magnet with a hole MP 20x8/4x5 / N38 is created for permanent mounting, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 6.65 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 rubber spacer 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. This product is dedicated for inside building use. For outdoor applications, we recommend choosing magnets in hermetic housing or additional protection with varnish.

The inner hole diameter determines the maximum size of the mounting element. 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 Ø20 mm (outer diameter) and height 5 mm. The pulling force of this model is an impressive 6.65 kg, which translates to 65.21 N in newtons. The mounting hole diameter is precisely 8/4 mm.

These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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 as well as cons of Nd₂Fe₁₄B magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:

They retain attractive force for almost ten years – the loss is just ~1% (based on simulations),
They show high resistance to demagnetization induced by external magnetic fields,
Thanks to the glossy finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an elegant appearance,
They are known for high magnetic induction at the operating surface, which improves attraction properties,
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...
Thanks to flexibility in forming and the ability to modify to individual projects,
Versatile presence in innovative solutions – they are used in HDD drives, drive modules, medical devices, and complex engineering applications.
Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Weaknesses

Disadvantages of neodymium magnets:

At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
Due to limitations in producing threads and complex forms in magnets, we propose using casing - magnetic holder.
Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small components of these products are able to disrupt the diagnostic process medical after entering the body.
With large orders the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum lifting capacity of the magnet – what affects it?

Magnet power was determined for the most favorable conditions, assuming:

using a base made of high-permeability steel, serving as a circuit closing element
whose transverse dimension is min. 10 mm
with a plane cleaned and smooth
with zero gap (without paint)
during detachment in a direction perpendicular to the mounting surface
at temperature room level

Determinants of lifting force in real conditions

Effective lifting capacity is affected by specific conditions, including (from priority):

Distance (betwixt the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
Base massiveness – insufficiently thick steel causes magnetic saturation, causing part of the power to be lost into the air.
Material composition – not every steel attracts identically. Alloy additives weaken the interaction with the magnet.
Surface quality – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was measured by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets

Fire warning

Powder produced during grinding of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Protect data

Device Safety: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, medical aids, timepieces).

Medical implants

Warning for patients: Powerful magnets affect medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Physical harm

Mind your fingers. Two powerful magnets will snap together instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Phone sensors

Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Allergy Warning

It is widely known that the nickel plating (the usual finish) is a common allergen. For allergy sufferers, refrain from direct skin contact or choose encased magnets.

Material brittleness

Protect your eyes. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Wear goggles.

No play value

Always store magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are fatal.

Safe operation

Handle magnets consciously. Their powerful strength can shock even professionals. Stay alert and respect their power.

Heat warning

Monitor thermal conditions. Heating the magnet to high heat will ruin its magnetic structure and strength.

Attention! Details about risks in the article: Safety of working with magnets.

MP 20x8/4x5 / N38 - ring magnet

Product card - MP 20x8/4x5 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the magnet - data

Table 1: Static force (pull vs gap) - characteristics MP 20x8/4x5 / N38

Table 2: Vertical force (wall) MP 20x8/4x5 / N38

Table 3: Vertical assembly (sliding) - vertical pull MP 20x8/4x5 / N38

Table 4: Steel thickness (substrate influence) - power losses MP 20x8/4x5 / N38

Table 5: Thermal resistance (material behavior) - resistance threshold MP 20x8/4x5 / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system MP 20x8/4x5 / N38

Table 7: Hazards (electronics) - precautionary measures MP 20x8/4x5 / N38

Table 8: Collisions (kinetic energy) - warning MP 20x8/4x5 / N38

Table 9: Coating parameters (durability) MP 20x8/4x5 / N38

Table 10: Electrical data (Flux) MP 20x8/4x5 / N38

Table 11: Underwater work (magnet fishing) MP 20x8/4x5 / N38

1. Wall mount (shear)

2. Efficiency vs thickness

3. Power loss vs temp

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

Material specification

Sustainability

Pulling force

Magnetic Induction

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MP 20x8/4x5 / N38 - ring magnet

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Weaknesses

Pull force analysis

Maximum lifting capacity of the magnet – what affects it?

Determinants of lifting force in real conditions

Precautions when working with NdFeB magnets

Fire warning

Protect data

Medical implants

Physical harm

Phone sensors

Allergy Warning

Material brittleness

No play value

Safe operation

Heat warning

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (pull vs gap) - characteristics
MP 20x8/4x5 / N38

Table 2: Vertical force (wall)
MP 20x8/4x5 / N38

Table 3: Vertical assembly (sliding) - vertical pull
MP 20x8/4x5 / N38

Table 4: Steel thickness (substrate influence) - power losses
MP 20x8/4x5 / N38

Table 5: Thermal resistance (material behavior) - resistance threshold
MP 20x8/4x5 / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 20x8/4x5 / N38

Table 7: Hazards (electronics) - precautionary measures
MP 20x8/4x5 / N38

Table 8: Collisions (kinetic energy) - warning
MP 20x8/4x5 / N38

Table 9: Coating parameters (durability)
MP 20x8/4x5 / N38

Table 10: Electrical data (Flux)
MP 20x8/4x5 / N38

Table 11: Underwater work (magnet fishing)
MP 20x8/4x5 / N38

Pros as well as cons of Nd₂Fe₁₄B magnets.