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MP 25x5x5 / 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 030193

GTIN/EAN: 5906301812104

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

17.67 g

Magnetization Direction

↑ axial

Load capacity

7.66 kg / 75.12 N

Magnetic Induction

230.20 mT / 2302 Gs

Coating

[NiCuNi] Nickel

check properties »

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Technical - MP 25x5x5 / N38 - ring magnet

Specification / characteristics - MP 25x5x5 / N38 - ring magnet

properties

properties	values
Cat. no.	030193
GTIN/EAN	5906301812104
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	5 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	17.67 g
Magnetization Direction	↑ axial
Load capacity ~ ?	7.66 kg / 75.12 N
Magnetic Induction ~ ?	230.20 mT / 2302 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x5x5 / 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 assembly - data

The following data are the direct effect of a engineering simulation. Results were calculated on models for the class Nd₂Fe₁₄B. Real-world parameters might slightly deviate from the simulation results. Treat these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - characteristics
MP 25x5x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	5777 Gs 577.7 mT	7.66 kg / 16.89 LBS 7660.0 g / 75.1 N	strong
1 mm	5310 Gs 531.0 mT	6.47 kg / 14.27 LBS 6471.0 g / 63.5 N	strong
2 mm	4846 Gs 484.6 mT	5.39 kg / 11.88 LBS 5388.6 g / 52.9 N	strong
3 mm	4397 Gs 439.7 mT	4.44 kg / 9.78 LBS 4437.9 g / 43.5 N	strong
5 mm	3576 Gs 357.6 mT	2.93 kg / 6.47 LBS 2934.8 g / 28.8 N	strong
10 mm	2073 Gs 207.3 mT	0.99 kg / 2.17 LBS 985.9 g / 9.7 N	low risk
15 mm	1231 Gs 123.1 mT	0.35 kg / 0.77 LBS 347.9 g / 3.4 N	low risk
20 mm	773 Gs 77.3 mT	0.14 kg / 0.30 LBS 137.0 g / 1.3 N	low risk
30 mm	356 Gs 35.6 mT	0.03 kg / 0.06 LBS 29.0 g / 0.3 N	low risk
50 mm	115 Gs 11.5 mT	0.00 kg / 0.01 LBS 3.0 g / 0.0 N	low risk

Grip strength decreases significantly with every mm of gap. Remember that even a microscopic distance (e.g., dirt, varnish, rust) strongly reduces the pull force. Magnetic products work strongest at the point of direct contact; gap drastically cuts the power. Notice how rapidly the pull force drop, when the product does not adhere flatly to the metal substrate. When calculating the mounting, discard redundant distances.

Table 2: Shear capacity (vertical surface)
MP 25x5x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	1.53 kg / 3.38 LBS 1532.0 g / 15.0 N
1 mm	Stal (~0.2)	1.29 kg / 2.85 LBS 1294.0 g / 12.7 N
2 mm	Stal (~0.2)	1.08 kg / 2.38 LBS 1078.0 g / 10.6 N
3 mm	Stal (~0.2)	0.89 kg / 1.96 LBS 888.0 g / 8.7 N
5 mm	Stal (~0.2)	0.59 kg / 1.29 LBS 586.0 g / 5.7 N
10 mm	Stal (~0.2)	0.20 kg / 0.44 LBS 198.0 g / 1.9 N
15 mm	Stal (~0.2)	0.07 kg / 0.15 LBS 70.0 g / 0.7 N
20 mm	Stal (~0.2)	0.03 kg / 0.06 LBS 28.0 g / 0.3 N
30 mm	Stal (~0.2)	0.01 kg / 0.01 LBS 6.0 g / 0.1 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 LBS 0.0 g / 0.0 N

The table below shows the estimated weight limit required to initiate the sliding of the magnet down against a upright steel wall (assuming standard friction coefficient). This parameter is a function of the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MP 25x5x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.30 kg / 5.07 LBS 2298.0 g / 22.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.53 kg / 3.38 LBS 1532.0 g / 15.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.77 kg / 1.69 LBS 766.0 g / 7.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.83 kg / 8.44 LBS 3830.0 g / 37.6 N

When hanging a holder on a vertical surface (e.g., a fridge), it you can count on only about 1/5 of its maximum pull force. Gravity and a low friction coefficient influence the fact that holders slip easier than they detach. Planning a wall mount? Consider that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the magnet will slide down under a noticeably lighter load. Application of an anti-slip pad can drastically increase the grip.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 25x5x5 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.77 kg / 1.69 LBS 766.0 g / 7.5 N
1 mm	25%	1.92 kg / 4.22 LBS 1915.0 g / 18.8 N
2 mm	50%	3.83 kg / 8.44 LBS 3830.0 g / 37.6 N
3 mm	75%	5.75 kg / 12.67 LBS 5745.0 g / 56.4 N
5 mm	100%	7.66 kg / 16.89 LBS 7660.0 g / 75.1 N
10 mm	100%	7.66 kg / 16.89 LBS 7660.0 g / 75.1 N
11 mm	100%	7.66 kg / 16.89 LBS 7660.0 g / 75.1 N
12 mm	100%	7.66 kg / 16.89 LBS 7660.0 g / 75.1 N

A too thin steel is unable to focus the full magnetic flux, which squanders power of the holder. If you mount a strong magnet to a too thin substrate, the flux will penetrate right through and the holding will be smaller. To utilize 100% of this neodymium's potential, you require a sufficiently solid piece of metal. The material oversaturation causes that on thin elements (e.g., thin profiles), the holder works worse. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal stability (material behavior) - thermal limit
MP 25x5x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	7.66 kg / 16.89 LBS 7660.0 g / 75.1 N	OK
40 °C	-2.2%	7.49 kg / 16.52 LBS 7491.5 g / 73.5 N	OK
60 °C	-4.4%	7.32 kg / 16.14 LBS 7323.0 g / 71.8 N	OK
80 °C	-6.6%	7.15 kg / 15.77 LBS 7154.4 g / 70.2 N
100 °C	-28.8%	5.45 kg / 12.02 LBS 5453.9 g / 53.5 N

Standard neodymium magnets change their properties parameters above the temperature limit. Avoid high temperatures – excessive heat can permanently damage this product. As the temperature rises, the magnet's power momentarily decreases. Avoid using this magnet in hot environments higher than its safe range. Too high temperature will lead to destruction of magnetism.

*Important note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Flat magnets (low Pc) risk losing magnetic properties under lower heat stress than long magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 25x5x5 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Shear Strength (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	82.42 kg / 181.72 LBS 6 082 Gs	12.36 kg / 27.26 LBS 12364 g / 121.3 N	N/A
1 mm	75.95 kg / 167.44 LBS 11 091 Gs	11.39 kg / 25.12 LBS 11392 g / 111.8 N	68.35 kg / 150.69 LBS ~0 Gs
2 mm	69.63 kg / 153.51 LBS 10 620 Gs	10.44 kg / 23.03 LBS 10445 g / 102.5 N	62.67 kg / 138.16 LBS ~0 Gs
3 mm	63.64 kg / 140.29 LBS 10 153 Gs	9.55 kg / 21.04 LBS 9545 g / 93.6 N	57.27 kg / 126.26 LBS ~0 Gs
5 mm	52.69 kg / 116.16 LBS 9 238 Gs	7.90 kg / 17.42 LBS 7903 g / 77.5 N	47.42 kg / 104.54 LBS ~0 Gs
10 mm	31.58 kg / 69.62 LBS 7 152 Gs	4.74 kg / 10.44 LBS 4737 g / 46.5 N	28.42 kg / 62.66 LBS ~0 Gs
20 mm	10.61 kg / 23.39 LBS 4 145 Gs	1.59 kg / 3.51 LBS 1591 g / 15.6 N	9.55 kg / 21.05 LBS ~0 Gs
50 mm	0.65 kg / 1.43 LBS 1 024 Gs	0.10 kg / 0.21 LBS 97 g / 1.0 N	0.58 kg / 1.28 LBS ~0 Gs
60 mm	0.31 kg / 0.69 LBS 712 Gs	0.05 kg / 0.10 LBS 47 g / 0.5 N	0.28 kg / 0.62 LBS ~0 Gs
70 mm	0.16 kg / 0.36 LBS 514 Gs	0.02 kg / 0.05 LBS 24 g / 0.2 N	0.15 kg / 0.32 LBS ~0 Gs
80 mm	0.09 kg / 0.20 LBS 383 Gs	0.01 kg / 0.03 LBS 14 g / 0.1 N	0.08 kg / 0.18 LBS ~0 Gs
90 mm	0.05 kg / 0.12 LBS 293 Gs	0.01 kg / 0.02 LBS 8 g / 0.1 N	0.05 kg / 0.11 LBS ~0 Gs
100 mm	0.03 kg / 0.07 LBS 230 Gs	0.00 kg / 0.01 LBS 5 g / 0.0 N	0.03 kg / 0.06 LBS ~0 Gs

Two magnets attract each other from a much further distance than a neodymium and metal combination. The setup of two magnets creates a more powerful interaction and a larger range of performance. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the pinch force is huge. The levitation is marginally weaker than the connection force, but still significant.
*The magnetic induction between like poles is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).
Important: Figures show sliding force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - warnings
MP 25x5x5 / 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
Timepiece	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

Extremely neodym field poses a real danger to electronics and medical implants. These magnets produce a field that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field passes through tissues and housings. Increased vigilance must be taken by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MP 25x5x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.62 km/h (6.28 m/s)	0.35 J
30 mm	36.46 km/h (10.13 m/s)	0.91 J
50 mm	46.96 km/h (13.05 m/s)	1.50 J
100 mm	66.40 km/h (18.45 m/s)	3.01 J

Neodymium magnets are prone to chipping – a violent impact against metal causes immediate chipping. Control the attraction moment – a neodymium left loose turns into a projectile. Impact energy can destroy the magnet or dangerous crushing to skin. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Corrosion resistance
MP 25x5x5 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (P_c)
MP 25x5x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	24 536 Mx	245.4 µWb
P_c Coefficient	1.03	High (Stable)

Flux value emitted by the pole surface. Essential parameter for generator designers and motors. P_c value determines the magnet's operating point.

Table 11: Submerged application
MP 25x5x5 / N38

Environment	Effective steel pull	Effect
Air (land)	7.66 kg	Standard
Water (riverbed)	8.77 kg (+1.11 kg buoyancy gain)	+14.5%

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

Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Wall mount (shear)

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

2. Plate thickness effect

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

3. Heat tolerance

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 1.03

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.

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%

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: 030193-2026

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The ring magnet with a hole MP 25x5x5 / 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 7.66 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. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. 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 easily scratched 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.

A screw or bolt with a thread diameter smaller than 5 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 25 mm and thickness 5 mm. The pulling force of this model is an impressive 7.66 kg, which translates to 75.12 N in newtons. The mounting hole diameter is precisely 5 mm.

These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. If you want two such magnets screwed with cones facing each other (faces) to attract, you must connect them with opposite poles (N to S). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths as well as weaknesses of rare earth magnets.

Advantages

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

They have constant strength, and over around ten years their attraction force decreases symbolically – ~1% (in testing),
Magnets very well resist against loss of magnetization caused by ambient magnetic noise,
By using a reflective coating of nickel, the element gains an professional look,
The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
Possibility of detailed shaping and modifying to individual conditions,
Huge importance in modern technologies – they find application in computer drives, motor assemblies, diagnostic systems, also other advanced devices.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in small systems

Weaknesses

Disadvantages of neodymium magnets:

Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
Neodymium magnets decrease their strength 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
Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
Limited ability of creating threads in the magnet and complicated forms - preferred is casing - magnetic holder.
Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, small components of these magnets can be problematic in diagnostics medical in case of swallowing.
With mass production the cost of neodymium magnets is a challenge,

Holding force characteristics

Detachment force of the magnet in optimal conditions – what contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:

with the use of a yoke made of special test steel, ensuring maximum field concentration
possessing a thickness of at least 10 mm to avoid saturation
characterized by smoothness
without any insulating layer between the magnet and steel
for force applied at a right angle (in the magnet axis)
at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

During everyday use, the actual holding force results from many variables, listed from most significant:

Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
Load vector – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
Material type – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate lowers the load capacity.

Safe handling of neodymium magnets

Permanent damage

Avoid heat. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).

Protect data

Avoid bringing magnets close to a purse, computer, or screen. The magnetism can permanently damage these devices and wipe information from cards.

Impact on smartphones

GPS units and smartphones are extremely sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

No play value

Neodymium magnets are not suitable for play. Accidental ingestion of several magnets may result in them pinching intestinal walls, which poses a critical condition and requires immediate surgery.

Risk of cracking

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.

Health Danger

Life threat: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Serious injuries

Pinching hazard: The pulling power is so great that it can cause blood blisters, crushing, and broken bones. Use thick gloves.

Fire risk

Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.

Respect the power

Be careful. Rare earth magnets attract from a distance and snap with huge force, often quicker than you can react.

Avoid contact if allergic

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

Warning! Looking for details? Read our article: Are neodymium magnets dangerous?

MP 25x5x5 / N38 - ring magnet

Technical - MP 25x5x5 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical simulation of the assembly - data

Table 1: Static pull force (force vs distance) - characteristics MP 25x5x5 / N38

Table 2: Shear capacity (vertical surface) MP 25x5x5 / N38

Table 3: Wall mounting (shearing) - vertical pull MP 25x5x5 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection MP 25x5x5 / N38

Table 5: Thermal stability (material behavior) - thermal limit MP 25x5x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range MP 25x5x5 / N38

Table 7: Hazards (electronics) - warnings MP 25x5x5 / N38

Table 8: Dynamics (kinetic energy) - warning MP 25x5x5 / N38

Table 9: Corrosion resistance MP 25x5x5 / N38

Table 10: Electrical data (Pc) MP 25x5x5 / N38

Table 11: Submerged application MP 25x5x5 / N38

1. Wall mount (shear)

2. Plate thickness effect

3. Heat tolerance

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

Material specification

Environmental data

Force (pull)

Field Strength

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MW 30x5 / N38 - cylindrical magnet

Strengths as well as weaknesses of rare earth magnets.

Advantages

Weaknesses

Holding force characteristics

Detachment force of the magnet in optimal conditions – what contributes to it?

Magnet lifting force in use – key factors

Safe handling of neodymium magnets

Permanent damage

Protect data

Impact on smartphones

No play value

Risk of cracking

Health Danger

Serious injuries

Fire risk

Respect the power

Avoid contact if allergic

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs distance) - characteristics
MP 25x5x5 / N38

Table 2: Shear capacity (vertical surface)
MP 25x5x5 / N38

Table 3: Wall mounting (shearing) - vertical pull
MP 25x5x5 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 25x5x5 / N38

Table 5: Thermal stability (material behavior) - thermal limit
MP 25x5x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 25x5x5 / N38

Table 7: Hazards (electronics) - warnings
MP 25x5x5 / N38

Table 8: Dynamics (kinetic energy) - warning
MP 25x5x5 / N38

Table 9: Corrosion resistance
MP 25x5x5 / N38

Table 10: Electrical data (P_c)
MP 25x5x5 / N38

Table 11: Submerged application
MP 25x5x5 / N38