Product available Ships today (order by 14:00)

MP 25x5x5 / 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 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

view properties »

6.00 ZŁ with VAT / pcs + price for transport

4.88 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

4.88 ZŁ

6.00 ZŁ

price from 150 pcs

4.59 ZŁ

5.64 ZŁ

price from 550 pcs

4.29 ZŁ

5.28 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Need help making a decision?

Contact us by phone +48 22 499 98 98 if you prefer contact us using inquiry form through our site.
Strength as well as structure of a neodymium magnet can be verified using our magnetic calculator.

Same-day processing for orders placed before 14:00.

Technical details - 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

Engineering modeling of the magnet - report

These data constitute the outcome of a engineering calculation. Results are based on algorithms for the material Nd₂Fe₁₄B. Actual parameters may differ. Please consider these data as a reference point when designing systems.

Table 1: Static pull force (force vs distance) - interaction chart
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 pounds 7660.0 g / 75.1 N	warning
1 mm	5310 Gs 531.0 mT	6.47 kg / 14.27 pounds 6471.0 g / 63.5 N	warning
2 mm	4846 Gs 484.6 mT	5.39 kg / 11.88 pounds 5388.6 g / 52.9 N	warning
3 mm	4397 Gs 439.7 mT	4.44 kg / 9.78 pounds 4437.9 g / 43.5 N	warning
5 mm	3576 Gs 357.6 mT	2.93 kg / 6.47 pounds 2934.8 g / 28.8 N	warning
10 mm	2073 Gs 207.3 mT	0.99 kg / 2.17 pounds 985.9 g / 9.7 N	safe
15 mm	1231 Gs 123.1 mT	0.35 kg / 0.77 pounds 347.9 g / 3.4 N	safe
20 mm	773 Gs 77.3 mT	0.14 kg / 0.30 pounds 137.0 g / 1.3 N	safe
30 mm	356 Gs 35.6 mT	0.03 kg / 0.06 pounds 29.0 g / 0.3 N	safe
50 mm	115 Gs 11.5 mT	0.00 kg / 0.01 pounds 3.0 g / 0.0 N	safe

Pulling power weakens drastically per each millimeter of spacing. Keep in mind that even the smallest gap (e.g., contamination, paint, veneer) strongly reduces the pull force. Magnetic products operate most effectively during direct contact; distance weakens the power. Analyze how flashily the load capacity drop, when the magnet does not adhere directly to the metal substrate. When calculating the assembly, discard redundant distances.

Table 2: Vertical capacity (wall)
MP 25x5x5 / N38

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

The following data indicates the theoretical weight limit sufficient to initiate the downward movement of the magnet down on a vertical steel plate (considering typical friction coefficient). This value depends on the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 pounds 2298.0 g / 22.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.53 kg / 3.38 pounds 1532.0 g / 15.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.77 kg / 1.69 pounds 766.0 g / 7.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.83 kg / 8.44 pounds 3830.0 g / 37.6 N

When mounting a element on a upright wall (e.g., a board), it will only hold barely about 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient cause that holders move down easier than they detach. Designing a vertical fastening? Remember that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the element will give way down under a noticeably lighter load. Application of an anti-slip pad can effectively increase the grip.

Table 4: Steel thickness (saturation) - power losses
MP 25x5x5 / N38

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

A thin metal plate is unable to absorb the entire magnetic field, which squanders power of the holder. If you attach a powerful product to a thin surface, the flux will penetrate right through and the pull force will drop sharply. To squeeze the maximum of this magnet's power, you require a sufficiently solid piece of steel. The saturation phenomenon causes that on thin elements (e.g., car bodies), the product works worse. We recommend selecting the steel dimension according to the table below.

Table 5: Thermal resistance (material behavior) - power drop
MP 25x5x5 / N38

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

Classic neodymiums irreversibly lose strength above the temperature limit. Protect against heat – high temperature can irreversibly destroy this product. With increasing heat, the magnet's power briefly drops. Do not use this magnet near heat sources exceeding its operating temperature limit. Too high temperature will result in destruction of magnetic properties.

*Technical advisory: Heat tolerance is determined by both grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) risk losing magnetic properties sooner than long magnets. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field collision
MP 25x5x5 / N38

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

Two strong neodymiums interact from a much further distance than a magnet and sheet combination. The setup of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Want to build a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is extreme. The levitation is a bit weaker than the connection force, but still significant.
*Flux density for N-N configuration reaches ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Attention: Figures show shear force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - precautionary measures
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
Phone / Smartphone	40 Gs (4.0 mT)	8.0 cm
Car key	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

A strong magnetic field is a real danger to electronics as well as medical implants. These neodymiums produce a field that disrupts operation of digital equipment. Be aware: the invisible magnetic field passes through tissues and housings. Special caution must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
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

NdFeB products are prone to chipping – a collision with steel causes immediate chipping. Pay attention to connection velocity – a magnet released freely becomes dangerous. Impact energy can trigger coating fragments or painful pinches to fingers. Be sure to control the product during mounting 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 neodymium. Use safety goggles when playing with large magnets.

Table 9: Coating parameters (durability)
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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MP 25x5x5 / N38

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

Total magnetic flux passing through the magnet pole. Essential parameter when building generators and motors. P_c value defines the working geometry.

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: 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. Buoyancy helps in lifting finds.

1. Wall mount (shear)

*Warning: On a vertical wall, the magnet holds just ~20% of its nominal pull.

2. Efficiency vs thickness

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

3. Temperature resistance

*For N38 grade, 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

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 and environmental data

Elemental analysis

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

Magnet Unit Converter

Force (pull)

Force (N)

Force in lbs

Field Strength

Induction (T)

Type a number in one of the inputs, to see the remaining units convert on the fly.

Other proposals

Product available Ships today (order by 14:00)

SM 32x450 [2xM8] / N42 - magnetic separator

1340.70 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

SM 32x375 [2xM8] / N42 - magnetic separator

1119.30 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

MP 10x6x4 / N38 - ring magnet

0.898 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

SM 25x250 [2xM8] / N42 - magnetic separator

688.80 ZŁ brutto / pcs

The ring-shaped magnet 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. 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 easily scratched 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 5 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.

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.

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.

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.

Benefits

Apart from their notable power, neodymium magnets have these key benefits:

They do not lose strength, even over approximately ten years – the decrease in lifting capacity is only ~1% (based on measurements),
They do not lose their magnetic properties even under close interference source,
In other words, due to the shiny layer of gold, the element is aesthetically pleasing,
Neodymium magnets generate maximum magnetic induction on a contact point, which allows for strong attraction,
Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
Considering the ability of free shaping and customization to specialized requirements, magnetic components can be produced in a broad palette of geometric configurations, which makes them more universal,
Fundamental importance in advanced technology sectors – they find application in data components, brushless drives, precision medical tools, and other advanced devices.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in compact constructions

Limitations

Disadvantages of neodymium magnets:

They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
Neodymium magnets decrease 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 stability even at temperatures up to 230°C
When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
Limited ability of producing threads in the magnet and complex shapes - preferred is casing - magnet mounting.
Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Furthermore, small elements of these products can be problematic in diagnostics medical when they are in the body.
With mass production the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum lifting capacity of the magnet – what contributes to it?

The force parameter is a result of laboratory testing conducted under the following configuration:

on a base made of mild steel, optimally conducting the magnetic flux
with a cross-section minimum 10 mm
with an polished contact surface
without any clearance between the magnet and steel
for force acting at a right angle (pull-off, not shear)
at ambient temperature room level

Determinants of practical lifting force of a magnet

Holding efficiency impacted by specific conditions, including (from most important):

Distance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
Chemical composition of the base – low-carbon steel gives the best results. Alloy steels decrease magnetic permeability and lifting capacity.
Base smoothness – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas 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.

H&S for magnets

Life threat

Warning for patients: Powerful magnets disrupt electronics. Keep at least 30 cm distance or ask another person to work with the magnets.

Permanent damage

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Beware of splinters

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Clashing of two magnets will cause them cracking into shards.

Cards and drives

Equipment safety: Strong magnets can damage data carriers and sensitive devices (pacemakers, hearing aids, mechanical watches).

Do not give to children

These products are not suitable for play. Swallowing a few magnets may result in them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.

Precision electronics

A powerful magnetic field disrupts the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to prevent damaging the sensors.

Do not drill into magnets

Mechanical processing of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Conscious usage

Handle magnets with awareness. Their huge power can surprise even experienced users. Stay alert and respect their power.

Bone fractures

Danger of trauma: The attraction force is so immense that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Allergic reactions

Studies show that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, avoid touching magnets with bare hands and choose coated magnets.

Warning! Want to know more? Read our article: Why are neodymium magnets dangerous?

MP 25x5x5 / N38 - ring magnet

Technical details - MP 25x5x5 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the magnet - report

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

Table 2: Vertical capacity (wall) MP 25x5x5 / N38

Table 3: Wall mounting (shearing) - behavior on slippery surfaces MP 25x5x5 / N38

Table 4: Steel thickness (saturation) - power losses MP 25x5x5 / N38

Table 5: Thermal resistance (material behavior) - power drop MP 25x5x5 / N38

Table 6: Two magnets (attraction) - field collision MP 25x5x5 / N38

Table 7: Protective zones (electronics) - precautionary measures MP 25x5x5 / N38

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

Table 9: Coating parameters (durability) MP 25x5x5 / N38

Table 10: Construction data (Flux) MP 25x5x5 / N38

Table 11: Submerged application MP 25x5x5 / N38

1. Wall mount (shear)

2. Efficiency vs thickness

3. Temperature resistance

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

Elemental analysis

Environmental data

Force (pull)

Field Strength

Other proposals

SM 32x450 [2xM8] / N42 - magnetic separator

SM 32x375 [2xM8] / N42 - magnetic separator

MP 10x6x4 / N38 - ring magnet

SM 25x250 [2xM8] / N42 - magnetic separator

Strengths as well as weaknesses of Nd2Fe14B magnets.

Benefits

Limitations

Lifting parameters

Maximum lifting capacity of the magnet – what contributes to it?

Determinants of practical lifting force of a magnet

H&S for magnets

Life threat

Permanent damage

Beware of splinters

Cards and drives

Do not give to children

Precision electronics

Do not drill into magnets

Conscious usage

Bone fractures

Allergic reactions

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

Table 2: Vertical capacity (wall)
MP 25x5x5 / N38

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 25x5x5 / N38

Table 4: Steel thickness (saturation) - power losses
MP 25x5x5 / N38

Table 5: Thermal resistance (material behavior) - power drop
MP 25x5x5 / N38

Table 6: Two magnets (attraction) - field collision
MP 25x5x5 / N38

Table 7: Protective zones (electronics) - precautionary measures
MP 25x5x5 / N38

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

Table 9: Coating parameters (durability)
MP 25x5x5 / N38

Table 10: Construction data (Flux)
MP 25x5x5 / N38

Table 11: Submerged application
MP 25x5x5 / N38

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.