Product on order Ships in 3-5 days

MP 25x13x4 / 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 030190

GTIN/EAN: 5906301812074

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

13 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

10.74 g

Magnetization Direction

↑ axial

Load capacity

4.14 kg / 40.57 N

Magnetic Induction

188.92 mT / 1889 Gs

Coating

[NiCuNi] Nickel

product specifications »

6.77 ZŁ with VAT / pcs + price for transport

5.50 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

5.50 ZŁ

6.77 ZŁ

price from 150 pcs

5.17 ZŁ

6.36 ZŁ

price from 500 pcs

4.84 ZŁ

5.95 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Looking for a better price?

Call us +48 22 499 98 98 alternatively drop us a message via form through our site.
Force and form of a magnet can be tested with our our magnetic calculator.

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

Product card - MP 25x13x4 / N38 - ring magnet

Specification / characteristics - MP 25x13x4 / N38 - ring magnet

properties

properties	values
Cat. no.	030190
GTIN/EAN	5906301812074
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	4 mm [±0,1 mm]
Weight	10.74 g
Magnetization Direction	↑ axial
Load capacity ~ ?	4.14 kg / 40.57 N
Magnetic Induction ~ ?	188.92 mT / 1889 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x13x4 / 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 simulation of the assembly - technical parameters

Presented data constitute the result of a mathematical simulation. Results rely on models for the material Nd₂Fe₁₄B. Actual conditions may differ from theoretical values. Please consider these calculations as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - characteristics
MP 25x13x4 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	5777 Gs 577.7 mT	4.14 kg / 9.13 LBS 4140.0 g / 40.6 N	warning
1 mm	5310 Gs 531.0 mT	3.50 kg / 7.71 LBS 3497.4 g / 34.3 N	warning
2 mm	4846 Gs 484.6 mT	2.91 kg / 6.42 LBS 2912.4 g / 28.6 N	warning
3 mm	4397 Gs 439.7 mT	2.40 kg / 5.29 LBS 2398.5 g / 23.5 N	warning
5 mm	3576 Gs 357.6 mT	1.59 kg / 3.50 LBS 1586.2 g / 15.6 N	low risk
10 mm	2073 Gs 207.3 mT	0.53 kg / 1.17 LBS 532.9 g / 5.2 N	low risk
15 mm	1231 Gs 123.1 mT	0.19 kg / 0.41 LBS 188.0 g / 1.8 N	low risk
20 mm	773 Gs 77.3 mT	0.07 kg / 0.16 LBS 74.0 g / 0.7 N	low risk
30 mm	356 Gs 35.6 mT	0.02 kg / 0.03 LBS 15.7 g / 0.2 N	low risk
50 mm	115 Gs 11.5 mT	0.00 kg / 0.00 LBS 1.6 g / 0.0 N	low risk

Grip strength drops significantly per each millimeter of spacing. Note that even a microscopic distance (e.g., contamination, varnish, veneer) significantly reduces the pull force. Magnets work most effectively at the point of direct contact; gap nullifies the power. See how flashily the load capacity fall, when the product does not adhere tightly to the steel surface. When planning the assembly, avoid unnecessary gaps.

Table 2: Shear force (wall)
MP 25x13x4 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	0.83 kg / 1.83 LBS 828.0 g / 8.1 N
1 mm	Stal (~0.2)	0.70 kg / 1.54 LBS 700.0 g / 6.9 N
2 mm	Stal (~0.2)	0.58 kg / 1.28 LBS 582.0 g / 5.7 N
3 mm	Stal (~0.2)	0.48 kg / 1.06 LBS 480.0 g / 4.7 N
5 mm	Stal (~0.2)	0.32 kg / 0.70 LBS 318.0 g / 3.1 N
10 mm	Stal (~0.2)	0.11 kg / 0.23 LBS 106.0 g / 1.0 N
15 mm	Stal (~0.2)	0.04 kg / 0.08 LBS 38.0 g / 0.4 N
20 mm	Stal (~0.2)	0.01 kg / 0.03 LBS 14.0 g / 0.1 N
30 mm	Stal (~0.2)	0.00 kg / 0.01 LBS 4.0 g / 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 LBS 0.0 g / 0.0 N

The following data presents the approximate force required to initiate the downward movement of the magnet downwards along a upright metal surface (assuming typical friction). This value depends on the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 25x13x4 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.24 kg / 2.74 LBS 1242.0 g / 12.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.83 kg / 1.83 LBS 828.0 g / 8.1 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.41 kg / 0.91 LBS 414.0 g / 4.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	2.07 kg / 4.56 LBS 2070.0 g / 20.3 N

When hanging a holder on a upright surface (e.g., a fridge), it you can count on only about 1/5 of its nominal power. Gravitational force and a low friction coefficient influence the fact that products slide down easier than they pop off the substrate. Want to create a wall mount? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the element will give way down under a much lighter weight. Utilizing a rubberized layer can drastically increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MP 25x13x4 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.41 kg / 0.91 LBS 414.0 g / 4.1 N
1 mm	25%	1.04 kg / 2.28 LBS 1035.0 g / 10.2 N
2 mm	50%	2.07 kg / 4.56 LBS 2070.0 g / 20.3 N
3 mm	75%	3.10 kg / 6.85 LBS 3105.0 g / 30.5 N
5 mm	100%	4.14 kg / 9.13 LBS 4140.0 g / 40.6 N
10 mm	100%	4.14 kg / 9.13 LBS 4140.0 g / 40.6 N
11 mm	100%	4.14 kg / 9.13 LBS 4140.0 g / 40.6 N
12 mm	100%	4.14 kg / 9.13 LBS 4140.0 g / 40.6 N

A thin sheet cannot conduct the entire magnetic field, which squanders power of the magnet. Should you mount a strong magnet to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's potential, you require a sufficiently solid piece of steel. The saturation effect causes that on delicate walls (e.g., car bodies), the holder shows lower pull force. We suggest choosing the steel thickness according to the table below.

Table 5: Working in heat (material behavior) - thermal limit
MP 25x13x4 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	4.14 kg / 9.13 LBS 4140.0 g / 40.6 N	OK
40 °C	-2.2%	4.05 kg / 8.93 LBS 4048.9 g / 39.7 N	OK
60 °C	-4.4%	3.96 kg / 8.73 LBS 3957.8 g / 38.8 N	OK
80 °C	-6.6%	3.87 kg / 8.52 LBS 3866.8 g / 37.9 N
100 °C	-28.8%	2.95 kg / 6.50 LBS 2947.7 g / 28.9 N

Classic neodymiums lose strength above the temperature limit. Protect against heat – excessive heat can permanently damage this product. With increasing heat, the neodymium's force temporarily decreases. Do not use this product near heat sources exceeding its working range. Ignoring the limit will result in permanent loss of magnetic properties.

*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) may lose charge permanently sooner than taller cylinders. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 25x13x4 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Sliding Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	83.66 kg / 184.44 LBS 6 082 Gs	12.55 kg / 27.67 LBS 12549 g / 123.1 N	N/A
1 mm	77.09 kg / 169.95 LBS 11 091 Gs	11.56 kg / 25.49 LBS 11563 g / 113.4 N	69.38 kg / 152.95 LBS ~0 Gs
2 mm	70.68 kg / 155.81 LBS 10 620 Gs	10.60 kg / 23.37 LBS 10601 g / 104.0 N	63.61 kg / 140.23 LBS ~0 Gs
3 mm	64.59 kg / 142.40 LBS 10 153 Gs	9.69 kg / 21.36 LBS 9689 g / 95.0 N	58.13 kg / 128.16 LBS ~0 Gs
5 mm	53.48 kg / 117.90 LBS 9 238 Gs	8.02 kg / 17.68 LBS 8022 g / 78.7 N	48.13 kg / 106.11 LBS ~0 Gs
10 mm	32.05 kg / 70.66 LBS 7 152 Gs	4.81 kg / 10.60 LBS 4808 g / 47.2 N	28.85 kg / 63.60 LBS ~0 Gs
20 mm	10.77 kg / 23.74 LBS 4 145 Gs	1.62 kg / 3.56 LBS 1615 g / 15.8 N	9.69 kg / 21.37 LBS ~0 Gs
50 mm	0.66 kg / 1.45 LBS 1 024 Gs	0.10 kg / 0.22 LBS 99 g / 1.0 N	0.59 kg / 1.30 LBS ~0 Gs
60 mm	0.32 kg / 0.70 LBS 712 Gs	0.05 kg / 0.10 LBS 48 g / 0.5 N	0.29 kg / 0.63 LBS ~0 Gs
70 mm	0.17 kg / 0.36 LBS 514 Gs	0.02 kg / 0.05 LBS 25 g / 0.2 N	0.15 kg / 0.33 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 / 0.07 LBS ~0 Gs

Two magnetic products interact from a much further distance than a magnet and sheet combination. Such a system of two magnets creates a more powerful interaction and a wider radius of performance. Planning to create a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is massive. The levitation is marginally weaker than the attraction, but still impressive.
*Flux density between like poles is approximately ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Note: Results show shear force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (electronics) - precautionary measures
MP 25x13x4 / 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
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

Extremely neodym field poses a serious hazard to electronic devices as well as medical implants. These neodymiums produce a flux that disrupts operation of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and housings. Special caution must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MP 25x13x4 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	21.33 km/h (5.93 m/s)	0.19 J
30 mm	34.38 km/h (9.55 m/s)	0.49 J
50 mm	44.29 km/h (12.30 m/s)	0.81 J
100 mm	62.62 km/h (17.39 m/s)	1.62 J

Magnetic elements are prone to chipping – a violent impact against metal risks their cracking. Control the attraction moment – a magnet released freely turns into a projectile. Impact energy can destroy the magnet or painful pinches to fingers. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when playing with large magnets.

Table 9: Corrosion resistance
MP 25x13x4 / N38

Technical parameter	Value / Description
Coating type	[NiCuNi] Nickel
Layer structure	Nickel - Copper - Nickel
Layer thickness	10-20 µm
Salt spray test (SST) ?	24 h
Recommended environment	Indoors only (dry)

The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MP 25x13x4 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	24 861 Mx	248.6 µWb
P_c Coefficient	1.02	High (Stable)

Flux value passing through the magnet pole. Essential parameter for generator designers as well as sensors. P_c value determines the working geometry.

Table 11: Submerged application
MP 25x13x4 / N38

Environment	Effective steel pull	Effect
Air (land)	4.14 kg	Standard
Water (riverbed)	4.74 kg (+0.60 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. Wall mount (shear)

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

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Heat tolerance

*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) = 1.02

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

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%

Sustainability

recyclability (EoL)	100%
recycled raw materials	~10% (pre-cons)
carbon footprint	low / zredukowany
waste code (EWC)	16 02 16

Safety card (GPSR)

responsible entity

Dhit sp. z o.o.

ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki

tel: +48 22 499 98 98 | e-mail: bok@dhit.pl

batch number/type

id: 030190-2026

Magnet Unit Converter

Pulling force

Kilograms (kg)

Force (N)

lbs

Field Strength

Tesla (T)

Type data in any box, and all other values change instantly.

View also proposals

Product on order Ships in 3-5 days

BM 950x180x70 [4x M8] - magnetic beam

8564.49 ZŁ brutto / pcs

Product on order Ships in 3-5 days

UMS 36x10.5x6.5x8 / N38 - conical magnetic holder

22.94 ZŁ brutto / pcs

Product on order Ships in 3-5 days

MP 14x8/4x3 / N38 - ring magnet

2.47 ZŁ brutto / pcs

Product on order Ships in 3-5 days

SM 32x425 [2xM8] / N52 - magnetic separator

1340.70 ZŁ brutto / pcs

The ring magnet with a hole MP 25x13x4 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 4.14 kg works great as a cabinet closure, 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 great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. It's a good idea to use a rubber spacer under the screw head, which will cushion the stresses. Remember: cracking during assembly results from material properties, not a product defect.

These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. In the place of the mounting hole, the coating is thinner and can be damaged when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.

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. Aesthetic mounting requires selecting the appropriate head size.

The presented product is a ring magnet with dimensions Ø25 mm (outer diameter) and height 4 mm. The pulling force of this model is an impressive 4.14 kg, which translates to 40.57 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 13 mm.

The poles are located on the planes with holes, not on the sides of the ring. 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.

Pros as well as cons of Nd₂Fe₁₄B magnets.

Advantages

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:

Their strength remains stable, and after around 10 years it decreases only by ~1% (according to research),
Magnets effectively defend themselves against demagnetization caused by foreign field sources,
In other words, due to the metallic finish of nickel, the element gains a professional look,
The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
Possibility of individual machining as well as adapting to atypical needs,
Key role in electronics industry – they are utilized in magnetic memories, electric drive systems, precision medical tools, also multitasking production systems.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in miniature devices

Disadvantages

Drawbacks and weaknesses of neodymium magnets and ways of using them

Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
When exposed to high temperature, neodymium magnets experience a drop in force. 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
They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
We suggest casing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated forms.
Health risk to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Additionally, tiny parts of these products are able to complicate diagnosis medical after entering the body.
With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Magnetic strength at its maximum – what it depends on?

Information about lifting capacity was determined for optimal configuration, assuming:

with the use of a yoke made of special test steel, ensuring full magnetic saturation
whose transverse dimension reaches at least 10 mm
characterized by lack of roughness
without any air gap between the magnet and steel
for force acting at a right angle (in the magnet axis)
at ambient temperature room level

Lifting capacity in practice – influencing factors

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

Clearance – existence of any layer (rust, dirt, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
Load vector – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly several 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 type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
Base smoothness – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate decreases the holding force.

Precautions when working with neodymium magnets

Fire risk

Fire warning: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

Immense force

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Life threat

People with a ICD must keep an large gap from magnets. The magnetic field can disrupt the operation of the life-saving device.

Demagnetization risk

Do not overheat. Neodymium magnets are sensitive to heat. If you require resistance above 80°C, look for HT versions (H, SH, UH).

Electronic devices

Do not bring magnets near a purse, laptop, or screen. The magnetism can permanently damage these devices and wipe information from cards.

Do not give to children

Neodymium magnets are not suitable for play. Swallowing a few magnets may result in them connecting inside the digestive tract, which poses a critical condition and requires immediate surgery.

Skin irritation risks

Certain individuals experience a contact allergy to nickel, which is the common plating for neodymium magnets. Prolonged contact might lead to skin redness. We recommend wear safety gloves.

Magnetic interference

Navigation devices and mobile phones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Magnet fragility

NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Clashing of two magnets leads to them cracking into small pieces.

Crushing risk

Protect your hands. Two powerful magnets will snap together immediately with a force of massive weight, destroying everything in their path. Be careful!

Security! Learn more about hazards in the article: Magnet Safety Guide.

MP 25x13x4 / N38 - ring magnet

Product card - MP 25x13x4 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the assembly - technical parameters

Table 1: Static force (pull vs distance) - characteristics MP 25x13x4 / N38

Table 2: Shear force (wall) MP 25x13x4 / N38

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces MP 25x13x4 / N38

Table 4: Steel thickness (saturation) - sheet metal selection MP 25x13x4 / N38

Table 5: Working in heat (material behavior) - thermal limit MP 25x13x4 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range MP 25x13x4 / N38

Table 7: Hazards (electronics) - precautionary measures MP 25x13x4 / N38

Table 8: Dynamics (kinetic energy) - warning MP 25x13x4 / N38

Table 9: Corrosion resistance MP 25x13x4 / N38

Table 10: Electrical data (Flux) MP 25x13x4 / N38

Table 11: Submerged application MP 25x13x4 / N38

1. Wall mount (shear)

2. Plate thickness effect

3. Heat tolerance

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

Chemical composition

Sustainability

Pulling force

Field Strength

View also proposals

BM 950x180x70 [4x M8] - magnetic beam

UMS 36x10.5x6.5x8 / N38 - conical magnetic holder

MP 14x8/4x3 / N38 - ring magnet

SM 32x425 [2xM8] / N52 - magnetic separator

Pros as well as cons of Nd2Fe14B magnets.

Advantages

Disadvantages

Pull force analysis

Magnetic strength at its maximum – what it depends on?

Lifting capacity in practice – influencing factors

Precautions when working with neodymium magnets

Fire risk

Immense force

Life threat

Demagnetization risk

Electronic devices

Do not give to children

Skin irritation risks

Magnetic interference

Magnet fragility

Crushing risk

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (pull vs distance) - characteristics
MP 25x13x4 / N38

Table 2: Shear force (wall)
MP 25x13x4 / N38

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 25x13x4 / N38

Table 4: Steel thickness (saturation) - sheet metal selection
MP 25x13x4 / N38

Table 5: Working in heat (material behavior) - thermal limit
MP 25x13x4 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 25x13x4 / N38

Table 7: Hazards (electronics) - precautionary measures
MP 25x13x4 / N38

Table 8: Dynamics (kinetic energy) - warning
MP 25x13x4 / N38

Table 9: Corrosion resistance
MP 25x13x4 / N38

Table 10: Electrical data (Flux)
MP 25x13x4 / N38

Table 11: Submerged application
MP 25x13x4 / N38

Pros as well as cons of Nd₂Fe₁₄B magnets.