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MP 25x13x8 / 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 030191

GTIN/EAN: 5906301812081

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

13 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

21.49 g

Magnetization Direction

↑ axial

Load capacity

10.49 kg / 102.90 N

Magnetic Induction

334.09 mT / 3341 Gs

Coating

[NiCuNi] Nickel

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13.53 ZŁ with VAT / pcs + price for transport

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Technical parameters of the product - MP 25x13x8 / N38 - ring magnet

Specification / characteristics - MP 25x13x8 / N38 - ring magnet

properties

properties	values
Cat. no.	030191
GTIN/EAN	5906301812081
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	13 mm [±0,1 mm]
Height	8 mm [±0,1 mm]
Weight	21.49 g
Magnetization Direction	↑ axial
Load capacity ~ ?	10.49 kg / 102.90 N
Magnetic Induction ~ ?	334.09 mT / 3341 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x13x8 / 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 modeling of the magnet - technical parameters

Presented data constitute the outcome of a mathematical calculation. Values were calculated on models for the material Nd₂Fe₁₄B. Actual parameters may differ from theoretical values. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs gap) - characteristics
MP 25x13x8 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	5777 Gs 577.7 mT	10.49 kg / 23.13 lbs 10490.0 g / 102.9 N	dangerous!
1 mm	5310 Gs 531.0 mT	8.86 kg / 19.54 lbs 8861.7 g / 86.9 N	medium risk
2 mm	4846 Gs 484.6 mT	7.38 kg / 16.27 lbs 7379.4 g / 72.4 N	medium risk
3 mm	4397 Gs 439.7 mT	6.08 kg / 13.40 lbs 6077.4 g / 59.6 N	medium risk
5 mm	3576 Gs 357.6 mT	4.02 kg / 8.86 lbs 4019.0 g / 39.4 N	medium risk
10 mm	2073 Gs 207.3 mT	1.35 kg / 2.98 lbs 1350.2 g / 13.2 N	weak grip
15 mm	1231 Gs 123.1 mT	0.48 kg / 1.05 lbs 476.4 g / 4.7 N	weak grip
20 mm	773 Gs 77.3 mT	0.19 kg / 0.41 lbs 187.6 g / 1.8 N	weak grip
30 mm	356 Gs 35.6 mT	0.04 kg / 0.09 lbs 39.8 g / 0.4 N	weak grip
50 mm	115 Gs 11.5 mT	0.00 kg / 0.01 lbs 4.1 g / 0.0 N	weak grip

Pulling power drops significantly with every subsequent millimeter of spacing. Note that even a very thin break (e.g., dirt, varnish, rust) strongly diminishes the holding power. Magnetic products operate optimally in perfect adhesion; gap kills the force. Observe how rapidly the parameters fall, when the magnet does not touch tightly to the steel surface. When planning the arrangement, eliminate redundant distances.

Table 2: Slippage load (wall)
MP 25x13x8 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	2.10 kg / 4.63 lbs 2098.0 g / 20.6 N
1 mm	Stal (~0.2)	1.77 kg / 3.91 lbs 1772.0 g / 17.4 N
2 mm	Stal (~0.2)	1.48 kg / 3.25 lbs 1476.0 g / 14.5 N
3 mm	Stal (~0.2)	1.22 kg / 2.68 lbs 1216.0 g / 11.9 N
5 mm	Stal (~0.2)	0.80 kg / 1.77 lbs 804.0 g / 7.9 N
10 mm	Stal (~0.2)	0.27 kg / 0.60 lbs 270.0 g / 2.6 N
15 mm	Stal (~0.2)	0.10 kg / 0.21 lbs 96.0 g / 0.9 N
20 mm	Stal (~0.2)	0.04 kg / 0.08 lbs 38.0 g / 0.4 N
30 mm	Stal (~0.2)	0.01 kg / 0.02 lbs 8.0 g / 0.1 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 lbs 0.0 g / 0.0 N

This section shows the approximate weight limit necessary to cause the sliding of the magnet down against a upright steel plate (considering standard friction coefficient). The holding force varies with the separation distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 25x13x8 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	3.15 kg / 6.94 lbs 3147.0 g / 30.9 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	2.10 kg / 4.63 lbs 2098.0 g / 20.6 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.05 kg / 2.31 lbs 1049.0 g / 10.3 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	5.25 kg / 11.56 lbs 5245.0 g / 51.5 N

When placing a holder on a vertical surface (e.g., a car body), it will only hold barely approx. 1/5 of its maximum pull force. Gravitational force and a weak degree of grip mean that products slip easier than they detach. Planning a hanger? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a much lighter cargo. Using a rubber layer can effectively improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 25x13x8 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	5%	0.52 kg / 1.16 lbs 524.5 g / 5.1 N
1 mm	13%	1.31 kg / 2.89 lbs 1311.3 g / 12.9 N
2 mm	25%	2.62 kg / 5.78 lbs 2622.5 g / 25.7 N
3 mm	38%	3.93 kg / 8.67 lbs 3933.8 g / 38.6 N
5 mm	63%	6.56 kg / 14.45 lbs 6556.3 g / 64.3 N
10 mm	100%	10.49 kg / 23.13 lbs 10490.0 g / 102.9 N
11 mm	100%	10.49 kg / 23.13 lbs 10490.0 g / 102.9 N
12 mm	100%	10.49 kg / 23.13 lbs 10490.0 g / 102.9 N

A too thin steel is unable to focus the full magnetic flux, which weakens actual performance of the magnet. If you mount a strong magnet to a thin surface, the field will penetrate right through and the holding will be smaller. To utilize full efficiency of this magnet's potential, you require a sufficiently solid piece of metal. The material oversaturation causes that on delicate walls (e.g., appliance housings), the magnet holds weaker. We advise picking the steel dimension based on the following data.

Table 5: Thermal resistance (material behavior) - power drop
MP 25x13x8 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	10.49 kg / 23.13 lbs 10490.0 g / 102.9 N	OK
40 °C	-2.2%	10.26 kg / 22.62 lbs 10259.2 g / 100.6 N	OK
60 °C	-4.4%	10.03 kg / 22.11 lbs 10028.4 g / 98.4 N	OK
80 °C	-6.6%	9.80 kg / 21.60 lbs 9797.7 g / 96.1 N
100 °C	-28.8%	7.47 kg / 16.47 lbs 7468.9 g / 73.3 N

Standard neodymium magnets lose strength after exceeding the maximum temperature. Avoid high temperatures – excessive heat can permanently damage this product. As the temperature rises, the neodymium's capacity temporarily lowers. Refrain from using this magnet close to ovens higher than its safe range. Ignoring the limit will lead to destruction of magnetism.

*Engineering note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) may lose charge permanently under lower heat stress compared to rod magnets. Warning indicator in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 25x13x8 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Shear Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	77.07 kg / 169.90 lbs 6 082 Gs	11.56 kg / 25.49 lbs 11560 g / 113.4 N	N/A
1 mm	71.01 kg / 156.55 lbs 11 091 Gs	10.65 kg / 23.48 lbs 10652 g / 104.5 N	63.91 kg / 140.90 lbs ~0 Gs
2 mm	65.10 kg / 143.53 lbs 10 620 Gs	9.77 kg / 21.53 lbs 9766 g / 95.8 N	58.59 kg / 129.18 lbs ~0 Gs
3 mm	59.50 kg / 131.17 lbs 10 153 Gs	8.92 kg / 19.68 lbs 8925 g / 87.6 N	53.55 kg / 118.06 lbs ~0 Gs
5 mm	49.26 kg / 108.61 lbs 9 238 Gs	7.39 kg / 16.29 lbs 7389 g / 72.5 N	44.34 kg / 97.74 lbs ~0 Gs
10 mm	29.53 kg / 65.10 lbs 7 152 Gs	4.43 kg / 9.76 lbs 4429 g / 43.4 N	26.57 kg / 58.59 lbs ~0 Gs
20 mm	9.92 kg / 21.87 lbs 4 145 Gs	1.49 kg / 3.28 lbs 1488 g / 14.6 N	8.93 kg / 19.68 lbs ~0 Gs
50 mm	0.61 kg / 1.33 lbs 1 024 Gs	0.09 kg / 0.20 lbs 91 g / 0.9 N	0.54 kg / 1.20 lbs ~0 Gs
60 mm	0.29 kg / 0.64 lbs 712 Gs	0.04 kg / 0.10 lbs 44 g / 0.4 N	0.26 kg / 0.58 lbs ~0 Gs
70 mm	0.15 kg / 0.34 lbs 514 Gs	0.02 kg / 0.05 lbs 23 g / 0.2 N	0.14 kg / 0.30 lbs ~0 Gs
80 mm	0.08 kg / 0.19 lbs 383 Gs	0.01 kg / 0.03 lbs 13 g / 0.1 N	0.08 kg / 0.17 lbs ~0 Gs
90 mm	0.05 kg / 0.11 lbs 293 Gs	0.01 kg / 0.02 lbs 7 g / 0.1 N	0.04 kg / 0.10 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 magnetic products interact from a much further distance than a magnet and sheet setup. Such a system of magnet-to-magnet produces a massive flux and a wider radius of operation. Planning to create a strong closure? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the impact force is extreme. The repulsion force is slightly lower than the connection force, but still significant.
*Field value for N-N configuration reaches ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
* Calculations show friction force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - precautionary measures
MP 25x13x8 / 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
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

Powerful magnet radiation poses a real danger to electronic devices as well as medical implants. These NdFeB products generate a flux that disrupts operation of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and plastic. Special caution must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MP 25x13x8 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	24.01 km/h (6.67 m/s)	0.48 J
30 mm	38.68 km/h (10.75 m/s)	1.24 J
50 mm	49.84 km/h (13.84 m/s)	2.06 J
100 mm	70.46 km/h (19.57 m/s)	4.12 J

NdFeB products are delicate – 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 fingers. Always hold the magnet during mounting so it doesn't hit violently against the metal. 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: Corrosion resistance
MP 25x13x8 / 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)

Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (P_c)
MP 25x13x8 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	23 118 Mx	231.2 µWb
P_c Coefficient	1.04	High (Stable)

Flux value emitted by the magnet pole. Key data in coil applications and motors. The P_c coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
MP 25x13x8 / N38

Environment	Effective steel pull	Effect
Air (land)	10.49 kg	Standard
Water (riverbed)	12.01 kg (+1.52 kg buoyancy gain)	+14.5%

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

Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Vertical hold

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

2. Plate thickness effect

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

3. Thermal stability

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 1.04

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The P_c (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher P_c value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical and environmental data

Chemical composition

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: 030191-2026

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The ring-shaped magnet MP 25x13x8 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables quick installation to wood, wall, plastic, or metal. It is also often used in advertising for fixing signs and in workshops for organizing tools.

This is a crucial issue when working with model MP 25x13x8 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. 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.

Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. 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 rubberized holders or additional protection with varnish.

A screw or bolt with a thread diameter smaller than 13 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. Always check that the screw head is not larger than the outer diameter of the magnet (25 mm), so it doesn't protrude beyond the outline.

This model is characterized by dimensions Ø25x8 mm and a weight of 21.49 g. The key parameter here is the lifting capacity amounting to approximately 10.49 kg (force ~102.90 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 13 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages as well as disadvantages of neodymium magnets.

Benefits

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

They do not lose magnetism, even over approximately 10 years – the drop in power is only ~1% (theoretically),
Magnets perfectly defend themselves against demagnetization caused by foreign field sources,
By applying a lustrous layer of nickel, the element has an elegant look,
Neodymium magnets deliver maximum magnetic induction on a small surface, which ensures high operational effectiveness,
Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
Possibility of individual creating as well as adjusting to concrete needs,
Significant place in high-tech industry – they are commonly used in computer drives, motor assemblies, diagnostic systems, as well as complex engineering applications.
Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in small systems

Disadvantages

Problematic aspects of neodymium magnets: application proposals

Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
We recommend cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that tiny parts of these magnets can complicate diagnosis medical after entering the body.
Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

Best holding force of the magnet in ideal parameters – what it depends on?

Holding force of 10.49 kg is a measurement result executed under specific, ideal conditions:

using a sheet made of low-carbon steel, functioning as a ideal flux conductor
possessing a thickness of min. 10 mm to avoid saturation
with a plane free of scratches
under conditions of no distance (surface-to-surface)
during pulling in a direction perpendicular to the plane
at room temperature

What influences lifting capacity in practice

During everyday use, the actual holding force depends on many variables, listed from crucial:

Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
Load vector – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
Material composition – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.

Warnings

Nickel allergy

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If an allergic reaction occurs, cease handling magnets and use protective gear.

Keep away from children

NdFeB magnets are not toys. Accidental ingestion of several magnets can lead to them connecting inside the digestive tract, which poses a severe health hazard and necessitates urgent medical intervention.

Do not underestimate power

Handle magnets consciously. Their huge power can surprise even experienced users. Be vigilant and do not underestimate their force.

Crushing risk

Mind your fingers. Two large magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Precision electronics

An intense magnetic field negatively affects the functioning of compasses in phones and navigation systems. Maintain magnets close to a device to prevent breaking the sensors.

Maximum temperature

Keep cool. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Dust explosion hazard

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Pacemakers

Patients with a ICD must keep an safe separation from magnets. The magnetism can disrupt the operation of the implant.

Shattering risk

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

Cards and drives

Avoid bringing magnets close to a wallet, laptop, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Caution! Want to know more? Read our article: Are neodymium magnets dangerous?

MP 25x13x8 / N38 - ring magnet

Technical parameters of the product - MP 25x13x8 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical modeling of the magnet - technical parameters

Table 1: Static pull force (force vs gap) - characteristics MP 25x13x8 / N38

Table 2: Slippage load (wall) MP 25x13x8 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MP 25x13x8 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection MP 25x13x8 / N38

Table 5: Thermal resistance (material behavior) - power drop MP 25x13x8 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range MP 25x13x8 / N38

Table 7: Protective zones (electronics) - precautionary measures MP 25x13x8 / N38

Table 8: Dynamics (kinetic energy) - warning MP 25x13x8 / N38

Table 9: Corrosion resistance MP 25x13x8 / N38

Table 10: Electrical data (Pc) MP 25x13x8 / N38

Table 11: Hydrostatics and buoyancy MP 25x13x8 / N38

1. Vertical hold

2. Plate thickness effect

3. Thermal stability

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

Chemical composition

Environmental data

Magnet pull force

Magnetic Field

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Advantages as well as disadvantages of neodymium magnets.

Benefits

Disadvantages

Lifting parameters

Best holding force of the magnet in ideal parameters – what it depends on?

What influences lifting capacity in practice

Warnings

Nickel allergy

Keep away from children

Do not underestimate power

Crushing risk

Precision electronics

Maximum temperature

Dust explosion hazard

Pacemakers

Shattering risk

Cards and drives

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs gap) - characteristics
MP 25x13x8 / N38

Table 2: Slippage load (wall)
MP 25x13x8 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 25x13x8 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 25x13x8 / N38

Table 5: Thermal resistance (material behavior) - power drop
MP 25x13x8 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 25x13x8 / N38

Table 7: Protective zones (electronics) - precautionary measures
MP 25x13x8 / N38

Table 8: Dynamics (kinetic energy) - warning
MP 25x13x8 / N38

Table 9: Corrosion resistance
MP 25x13x8 / N38

Table 10: Electrical data (P_c)
MP 25x13x8 / N38

Table 11: Hydrostatics and buoyancy
MP 25x13x8 / N38