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MP 25x8x20 / N38 - ring magnet

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

ring magnet

Catalog no 030450

GTIN/EAN: 5906301812340

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

8 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

66.09 g

Magnetization Direction

↑ axial

Load capacity

19.02 kg / 186.54 N

Magnetic Induction

525.50 mT / 5255 Gs

Coating

[NiCuNi] Nickel

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Technical - MP 25x8x20 / N38 - ring magnet

Specification / characteristics - MP 25x8x20 / N38 - ring magnet

properties

properties	values
Cat. no.	030450
GTIN/EAN	5906301812340
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	25 mm [±0,1 mm]
internal diameter Ø	8 mm [±0,1 mm]
Height	20 mm [±0,1 mm]
Weight	66.09 g
Magnetization Direction	↑ axial
Load capacity ~ ?	19.02 kg / 186.54 N
Magnetic Induction ~ ?	525.50 mT / 5255 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x8x20 / 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

Technical simulation of the product - technical parameters

The following data constitute the outcome of a physical calculation. Results are based on models for the material Nd₂Fe₁₄B. Operational performance might slightly differ. Please consider these data as a preliminary roadmap for designers.

Table 1: Static force (force vs gap) - characteristics
MP 25x8x20 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	5777 Gs 577.7 mT	19.02 kg / 41.93 pounds 19020.0 g / 186.6 N	dangerous!
1 mm	5310 Gs 531.0 mT	16.07 kg / 35.42 pounds 16067.7 g / 157.6 N	dangerous!
2 mm	4846 Gs 484.6 mT	13.38 kg / 29.50 pounds 13380.1 g / 131.3 N	dangerous!
3 mm	4397 Gs 439.7 mT	11.02 kg / 24.29 pounds 11019.3 g / 108.1 N	dangerous!
5 mm	3576 Gs 357.6 mT	7.29 kg / 16.07 pounds 7287.1 g / 71.5 N	medium risk
10 mm	2073 Gs 207.3 mT	2.45 kg / 5.40 pounds 2448.1 g / 24.0 N	medium risk
15 mm	1231 Gs 123.1 mT	0.86 kg / 1.90 pounds 863.8 g / 8.5 N	low risk
20 mm	773 Gs 77.3 mT	0.34 kg / 0.75 pounds 340.1 g / 3.3 N	low risk
30 mm	356 Gs 35.6 mT	0.07 kg / 0.16 pounds 72.1 g / 0.7 N	low risk
50 mm	115 Gs 11.5 mT	0.01 kg / 0.02 pounds 7.5 g / 0.1 N	low risk

Magnetic force decreases significantly with every mm of gap. Keep in mind that even a microscopic distance (e.g., contamination, paint, rust) strongly weakens the grip. Magnets hold optimally during direct contact; distance kills the power. See how quickly the pull force plummet, when the product does not adhere tightly to the steel surface. When planning the arrangement, avoid redundant distances.

Table 2: Sliding capacity (vertical surface)
MP 25x8x20 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	3.80 kg / 8.39 pounds 3804.0 g / 37.3 N
1 mm	Stal (~0.2)	3.21 kg / 7.09 pounds 3214.0 g / 31.5 N
2 mm	Stal (~0.2)	2.68 kg / 5.90 pounds 2676.0 g / 26.3 N
3 mm	Stal (~0.2)	2.20 kg / 4.86 pounds 2204.0 g / 21.6 N
5 mm	Stal (~0.2)	1.46 kg / 3.21 pounds 1458.0 g / 14.3 N
10 mm	Stal (~0.2)	0.49 kg / 1.08 pounds 490.0 g / 4.8 N
15 mm	Stal (~0.2)	0.17 kg / 0.38 pounds 172.0 g / 1.7 N
20 mm	Stal (~0.2)	0.07 kg / 0.15 pounds 68.0 g / 0.7 N
30 mm	Stal (~0.2)	0.01 kg / 0.03 pounds 14.0 g / 0.1 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 2.0 g / 0.0 N

The table below indicates the approximate force required to initiate the downward movement of the magnet down on a upright steel plate (assuming typical friction). This value is relative to the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 25x8x20 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	5.71 kg / 12.58 pounds 5706.0 g / 56.0 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	3.80 kg / 8.39 pounds 3804.0 g / 37.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.90 kg / 4.19 pounds 1902.0 g / 18.7 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	9.51 kg / 20.97 pounds 9510.0 g / 93.3 N

When mounting a magnet on a upright plane (e.g., a fridge), it will maintain just approx. 20%-30% of its nominal power. Gravitational force and a weak degree of grip cause that holders slip easier than they pull off. Planning a wall mount? Note that the shear force is much weaker than the maximum static pull force. On a painted metal, the holder will slip down under a noticeably lighter load. Using a rubber pad can effectively improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 25x8x20 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	5%	0.95 kg / 2.10 pounds 951.0 g / 9.3 N
1 mm	13%	2.38 kg / 5.24 pounds 2377.5 g / 23.3 N
2 mm	25%	4.76 kg / 10.48 pounds 4755.0 g / 46.6 N
3 mm	38%	7.13 kg / 15.72 pounds 7132.5 g / 70.0 N
5 mm	63%	11.89 kg / 26.21 pounds 11887.5 g / 116.6 N
10 mm	100%	19.02 kg / 41.93 pounds 19020.0 g / 186.6 N
11 mm	100%	19.02 kg / 41.93 pounds 19020.0 g / 186.6 N
12 mm	100%	19.02 kg / 41.93 pounds 19020.0 g / 186.6 N

A thin sheet cannot focus the full magnetic flux, which weakens actual performance of the holder. If you install a neodymium to a too thin substrate, the flux will pass right through and the pull force will drop sharply. To utilize full efficiency of this neodymium's power, you require a sufficiently solid element of steel. The saturation effect causes that on sheet metal structures (e.g., appliance housings), the magnet holds weaker. We suggest choosing the steel dimension based on the following data.

Table 5: Working in heat (material behavior) - power drop
MP 25x8x20 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	19.02 kg / 41.93 pounds 19020.0 g / 186.6 N	OK
40 °C	-2.2%	18.60 kg / 41.01 pounds 18601.6 g / 182.5 N	OK
60 °C	-4.4%	18.18 kg / 40.09 pounds 18183.1 g / 178.4 N	OK
80 °C	-6.6%	17.76 kg / 39.16 pounds 17764.7 g / 174.3 N
100 °C	-28.8%	13.54 kg / 29.86 pounds 13542.2 g / 132.8 N

Classic neodymiums lose strength after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently destroy this product. With every degree above norm, the neodymium's capacity momentarily drops. Do not use this magnet in hot environments higher than its operating temperature limit. Too high temperature will cause destruction of magnetism.

*Technical advisory: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) may lose charge permanently under lower heat stress than long magnets. The danger warning in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 25x8x20 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Shear Strength (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	30.91 kg / 68.14 pounds 6 082 Gs	4.64 kg / 10.22 pounds 4636 g / 45.5 N	N/A
1 mm	28.48 kg / 62.79 pounds 11 091 Gs	4.27 kg / 9.42 pounds 4272 g / 41.9 N	25.63 kg / 56.51 pounds ~0 Gs
2 mm	26.11 kg / 57.57 pounds 10 620 Gs	3.92 kg / 8.63 pounds 3917 g / 38.4 N	23.50 kg / 51.81 pounds ~0 Gs
3 mm	23.86 kg / 52.61 pounds 10 153 Gs	3.58 kg / 7.89 pounds 3580 g / 35.1 N	21.48 kg / 47.35 pounds ~0 Gs
5 mm	19.76 kg / 43.56 pounds 9 238 Gs	2.96 kg / 6.53 pounds 2964 g / 29.1 N	17.78 kg / 39.20 pounds ~0 Gs
10 mm	11.84 kg / 26.11 pounds 7 152 Gs	1.78 kg / 3.92 pounds 1776 g / 17.4 N	10.66 kg / 23.50 pounds ~0 Gs
20 mm	3.98 kg / 8.77 pounds 4 145 Gs	0.60 kg / 1.32 pounds 597 g / 5.9 N	3.58 kg / 7.89 pounds ~0 Gs
50 mm	0.24 kg / 0.54 pounds 1 024 Gs	0.04 kg / 0.08 pounds 36 g / 0.4 N	0.22 kg / 0.48 pounds ~0 Gs
60 mm	0.12 kg / 0.26 pounds 712 Gs	0.02 kg / 0.04 pounds 18 g / 0.2 N	0.11 kg / 0.23 pounds ~0 Gs
70 mm	0.06 kg / 0.13 pounds 514 Gs	0.01 kg / 0.02 pounds 9 g / 0.1 N	0.06 kg / 0.12 pounds ~0 Gs
80 mm	0.03 kg / 0.07 pounds 383 Gs	0.01 kg / 0.01 pounds 5 g / 0.1 N	0.03 kg / 0.07 pounds ~0 Gs
90 mm	0.02 kg / 0.04 pounds 293 Gs	0.00 kg / 0.01 pounds 3 g / 0.0 N	0.02 kg / 0.04 pounds ~0 Gs
100 mm	0.01 kg / 0.03 pounds 230 Gs	0.00 kg / 0.00 pounds 2 g / 0.0 N	0.01 kg / 0.02 pounds ~0 Gs

Two magnetic products attract each other from a wider radius than a magnet and steel combination. The setup of magnet-to-magnet creates a more powerful interaction and a further horizon of operation. Planning to create a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when bringing together two magnets, the pinch force is extreme. The repulsion force is slightly lower than the attraction, but still impressive.
*Flux density between like poles reaches ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
* Results refer to shear force of two matching neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - precautionary measures
MP 25x8x20 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	17.0 cm
Hearing aid	10 Gs (1.0 mT)	13.5 cm
Mechanical watch	20 Gs (2.0 mT)	10.5 cm
Mobile device	40 Gs (4.0 mT)	8.0 cm
Remote	50 Gs (5.0 mT)	7.5 cm
Payment card	400 Gs (40.0 mT)	3.0 cm
HDD hard drive	600 Gs (60.0 mT)	2.5 cm

Powerful magnet radiation poses a real danger to IT equipment as well as medical implants. These neodymiums generate a flux that destroys function of digital equipment. Be aware: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - collision effects
MP 25x8x20 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	18.43 km/h (5.12 m/s)	0.87 J
30 mm	29.70 km/h (8.25 m/s)	2.25 J
50 mm	38.27 km/h (10.63 m/s)	3.73 J
100 mm	54.10 km/h (15.03 m/s)	7.46 J

Neodymium magnets are prone to chipping – a strong collision with metal can result in shattering. Control the attraction moment – a neodymium left loose turns into a projectile. Impact energy can trigger coating fragments or injury to fingers. Be sure to control the product during mounting so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Coating parameters (durability)
MP 25x8x20 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (P_c)
MP 25x8x20 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	10 108 Mx	101.1 µWb
P_c Coefficient	1.25	High (Stable)

Flux value emitted by the magnet pole. Key data when building generators as well as sensors. P_c value defines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 25x8x20 / N38

Environment	Effective steel pull	Effect
Air (land)	19.02 kg	Standard
Water (riverbed)	21.78 kg (+2.76 kg buoyancy gain)	+14.5%

Rust risk: 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. Sliding resistance

*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Steel saturation

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

3. Thermal stability

*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) = 1.25

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%

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: 030450-2026

Quick Unit Converter

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Kilograms (kg)

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The ring magnet with a hole MP 25x8x20 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. It is also often used in advertising for fixing signs and in workshops for organizing tools.

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. The flat screw head should evenly press the magnet. 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 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 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 Ø25 mm (outer diameter) and height 20 mm. The key parameter here is the holding force amounting to approximately 19.02 kg (force ~186.54 N). The mounting hole diameter is precisely 8 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 rare earth magnets.

Benefits

Apart from their strong magnetism, neodymium magnets have these key benefits:

They have constant strength, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
Magnets very well protect themselves against demagnetization caused by ambient magnetic noise,
In other words, due to the reflective finish of nickel, the element becomes visually attractive,
They are known for high magnetic induction at the operating surface, which improves attraction properties,
Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
Due to the option of free forming and adaptation to custom requirements, NdFeB magnets can be modeled in a variety of geometric configurations, which expands the range of possible applications,
Significant place in electronics industry – they are commonly used in computer drives, electric motors, medical devices, as well as modern systems.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in small systems

Weaknesses

Disadvantages of neodymium magnets:

To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
We suggest casing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex forms.
Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these magnets can disrupt the diagnostic process medical after entering the body.
With mass production the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

The force parameter is a measurement result performed under the following configuration:

on a plate made of mild steel, perfectly concentrating the magnetic flux
whose thickness equals approx. 10 mm
with an ground contact surface
with zero gap (without impurities)
for force acting at a right angle (pull-off, not shear)
in neutral thermal conditions

Determinants of practical lifting force of a magnet

During everyday use, the actual lifting capacity is determined by many variables, listed from crucial:

Clearance – the presence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
Load vector – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
Chemical composition of the base – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and lifting capacity.
Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Safe handling of neodymium magnets

Warning for allergy sufferers

Some people experience a contact allergy to nickel, which is the standard coating for NdFeB magnets. Frequent touching can result in dermatitis. We recommend use safety gloves.

GPS and phone interference

Note: neodymium magnets produce a field that confuses sensitive sensors. Maintain a separation from your mobile, tablet, and GPS.

Handling guide

Be careful. Neodymium magnets attract from a distance and connect with massive power, often faster than you can move away.

Warning for heart patients

People with a ICD must keep an large gap from magnets. The magnetism can stop the functioning of the implant.

Magnetic media

Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Heat sensitivity

Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

Magnets are brittle

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Crushing risk

Watch your fingers. Two powerful magnets will join immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Fire risk

Powder produced during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.

This is not a toy

These products are not suitable for play. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which poses a critical condition and requires immediate surgery.

Security! Looking for details? Check our post: Why are neodymium magnets dangerous?

MP 25x8x20 / N38 - ring magnet

Technical - MP 25x8x20 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical simulation of the product - technical parameters

Table 1: Static force (force vs gap) - characteristics MP 25x8x20 / N38

Table 2: Sliding capacity (vertical surface) MP 25x8x20 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces MP 25x8x20 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection MP 25x8x20 / N38

Table 5: Working in heat (material behavior) - power drop MP 25x8x20 / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system MP 25x8x20 / N38

Table 7: Hazards (implants) - precautionary measures MP 25x8x20 / N38

Table 8: Dynamics (cracking risk) - collision effects MP 25x8x20 / N38

Table 9: Coating parameters (durability) MP 25x8x20 / N38

Table 10: Construction data (Pc) MP 25x8x20 / N38

Table 11: Underwater work (magnet fishing) MP 25x8x20 / N38

1. Sliding resistance

2. Steel saturation

3. Thermal stability

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

Material specification

Ecology and recycling (GPSR)

Force (pull)

Field Strength

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Pros and cons of rare earth magnets.

Benefits

Weaknesses

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

Determinants of practical lifting force of a magnet

Safe handling of neodymium magnets

Warning for allergy sufferers

GPS and phone interference

Handling guide

Warning for heart patients

Magnetic media

Heat sensitivity

Magnets are brittle

Crushing risk

Fire risk

This is not a toy

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs gap) - characteristics
MP 25x8x20 / N38

Table 2: Sliding capacity (vertical surface)
MP 25x8x20 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 25x8x20 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 25x8x20 / N38

Table 5: Working in heat (material behavior) - power drop
MP 25x8x20 / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 25x8x20 / N38

Table 7: Hazards (implants) - precautionary measures
MP 25x8x20 / N38

Table 8: Dynamics (cracking risk) - collision effects
MP 25x8x20 / N38

Table 9: Coating parameters (durability)
MP 25x8x20 / N38

Table 10: Construction data (P_c)
MP 25x8x20 / N38

Table 11: Underwater work (magnet fishing)
MP 25x8x20 / N38