Product on order Ships in 3-5 days

MP 25x13x8 / 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 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

product parameters »

13.53 ZŁ with VAT / pcs + price for transport

11.00 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

11.00 ZŁ

13.53 ZŁ

price from 60 pcs

10.34 ZŁ

12.72 ZŁ

price from 230 pcs

9.68 ZŁ

11.91 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Do you have problems deciding?

Give us a call +48 888 99 98 98 if you prefer let us know using form through our site.
Parameters as well as structure of a magnet can be analyzed on our force calculator.

Order by 14:00 and we’ll ship today!

Physical properties - 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 assembly - report

Presented information are the direct effect of a engineering calculation. Values were calculated on models for the class Nd₂Fe₁₄B. Real-world conditions may differ. Use these calculations as a reference point for designers.

Table 1: Static force (force vs distance) - 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 pounds 10490.0 g / 102.9 N	crushing
1 mm	5310 Gs 531.0 mT	8.86 kg / 19.54 pounds 8861.7 g / 86.9 N	medium risk
2 mm	4846 Gs 484.6 mT	7.38 kg / 16.27 pounds 7379.4 g / 72.4 N	medium risk
3 mm	4397 Gs 439.7 mT	6.08 kg / 13.40 pounds 6077.4 g / 59.6 N	medium risk
5 mm	3576 Gs 357.6 mT	4.02 kg / 8.86 pounds 4019.0 g / 39.4 N	medium risk
10 mm	2073 Gs 207.3 mT	1.35 kg / 2.98 pounds 1350.2 g / 13.2 N	weak grip
15 mm	1231 Gs 123.1 mT	0.48 kg / 1.05 pounds 476.4 g / 4.7 N	weak grip
20 mm	773 Gs 77.3 mT	0.19 kg / 0.41 pounds 187.6 g / 1.8 N	weak grip
30 mm	356 Gs 35.6 mT	0.04 kg / 0.09 pounds 39.8 g / 0.4 N	weak grip
50 mm	115 Gs 11.5 mT	0.00 kg / 0.01 pounds 4.1 g / 0.0 N	weak grip

Magnetic force drops drastically with every mm of spacing. Keep in mind that even a microscopic distance (e.g., dirt, varnish, dust) significantly reduces the pull force. Magnetic products operate strongest at the point of direct contact; distance nullifies the force. Notice how flashily the pull force drop, when the magnet does not adhere flatly to the steel surface. When designing the arrangement, avoid additional spacers.

Table 2: Sliding force (wall)
MP 25x13x8 / N38

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

This section shows the estimated weight limit necessary to initiate the downward movement of the magnet down against a upright metal surface (considering typical friction coefficient). The holding force is relative to the gap size between the magnet and the metal.

Table 3: Vertical assembly (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 pounds 3147.0 g / 30.9 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	2.10 kg / 4.63 pounds 2098.0 g / 20.6 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.05 kg / 2.31 pounds 1049.0 g / 10.3 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	5.25 kg / 11.56 pounds 5245.0 g / 51.5 N

When placing a holder on a vertical surface (e.g., a car body), it will maintain only approx. 20%-30% of nominal attraction strength. Gravity and a low friction coefficient cause that holders move down easier than they detach. Planning a hanger? Consider that the sliding force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the element will slip down under a noticeably lighter load. Utilizing a rubberized pad can drastically increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MP 25x13x8 / N38

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

A too thin steel is incapable of take in the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a too thin substrate, the field will penetrate right through and the attraction force will be weaker. To achieve 100% of this neodymium's potential, you need a suitably thick element of metal. The saturation phenomenon causes that on sheet metal structures (e.g., car bodies), the product shows lower pull force. We advise picking the steel thickness according to the table below.

Table 5: Thermal resistance (stability) - thermal limit
MP 25x13x8 / N38

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

Standard neodymium magnets irreversibly lose power above the temperature limit. Avoid high temperatures – heat can irreversibly damage this product. With increasing heat, the neodymium's force briefly decreases. Avoid using this product near heat sources exceeding its working range. Too high temperature will cause permanent loss of magnetism.

*Engineering note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) risk losing magnetic properties at lower temperatures compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
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 pounds 6 082 Gs	11.56 kg / 25.49 pounds 11560 g / 113.4 N	N/A
1 mm	71.01 kg / 156.55 pounds 11 091 Gs	10.65 kg / 23.48 pounds 10652 g / 104.5 N	63.91 kg / 140.90 pounds ~0 Gs
2 mm	65.10 kg / 143.53 pounds 10 620 Gs	9.77 kg / 21.53 pounds 9766 g / 95.8 N	58.59 kg / 129.18 pounds ~0 Gs
3 mm	59.50 kg / 131.17 pounds 10 153 Gs	8.92 kg / 19.68 pounds 8925 g / 87.6 N	53.55 kg / 118.06 pounds ~0 Gs
5 mm	49.26 kg / 108.61 pounds 9 238 Gs	7.39 kg / 16.29 pounds 7389 g / 72.5 N	44.34 kg / 97.74 pounds ~0 Gs
10 mm	29.53 kg / 65.10 pounds 7 152 Gs	4.43 kg / 9.76 pounds 4429 g / 43.4 N	26.57 kg / 58.59 pounds ~0 Gs
20 mm	9.92 kg / 21.87 pounds 4 145 Gs	1.49 kg / 3.28 pounds 1488 g / 14.6 N	8.93 kg / 19.68 pounds ~0 Gs
50 mm	0.61 kg / 1.33 pounds 1 024 Gs	0.09 kg / 0.20 pounds 91 g / 0.9 N	0.54 kg / 1.20 pounds ~0 Gs
60 mm	0.29 kg / 0.64 pounds 712 Gs	0.04 kg / 0.10 pounds 44 g / 0.4 N	0.26 kg / 0.58 pounds ~0 Gs
70 mm	0.15 kg / 0.34 pounds 514 Gs	0.02 kg / 0.05 pounds 23 g / 0.2 N	0.14 kg / 0.30 pounds ~0 Gs
80 mm	0.08 kg / 0.19 pounds 383 Gs	0.01 kg / 0.03 pounds 13 g / 0.1 N	0.08 kg / 0.17 pounds ~0 Gs
90 mm	0.05 kg / 0.11 pounds 293 Gs	0.01 kg / 0.02 pounds 7 g / 0.1 N	0.04 kg / 0.10 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 magnetic products interact from a much further distance than a magnet and sheet setup. Such a system of two magnets produces a massive flux and a wider radius of action. Planning to create a solid fastener? Apply two magnets instead of one magnet and a steel. Be careful that when bringing together two magnets, the pinch force is huge. The repulsion force is a bit weaker than the connection force, but still impressive.
*The magnetic induction in repulsion mode is approximately ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
* Estimates apply to shear force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (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
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 large risk to electronics as well as pacemakers. These NdFeB products generate a flux that disrupts operation of sensitive medical devices. Be aware: the unseen radiation passes through tissues and plastic. Special caution must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - 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 very brittle – a strong collision with metal risks their cracking. Control the attraction moment – a neodymium left loose becomes dangerous. Striking energy can destroy the magnet or painful pinches to fingers. Be sure to control the product during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear eye protection when playing with powerful specimens.

Table 9: Surface protection spec
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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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 passing through the pole surface. Key data when building generators as well as sensors. The P_c coefficient defines the working geometry.

Table 11: Submerged application
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%

Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.

1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds just a fraction of its max power.

2. Steel saturation

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

3. Power loss vs temp

*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) = 1.04

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%

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

Quick Unit Converter

Magnet pull force

Force in kg

Force (N)

Force in lbs

Magnetic Induction

Gauss (Gs)

Just complete a single box, to let the calculator compute everything else automatically.

View also deals

Product on order Ships in 3-5 days

HH 16x5.3 [M3] / N38 - through hole magnetic holder

3.32 ZŁ brutto / pcs

Product on order Ships in 3-5 days

UMC 42x7/4x9 / N38 - cylindrical magnetic holder

29.99 ZŁ brutto / pcs

Product on order Ships in 3-5 days

MPL 30x15x10 / N38 - lamellar magnet

24.48 ZŁ brutto / pcs

Product on order Ships in 3-5 days

SM 32x225 [2xM8] / N42 - magnetic separator

848.70 ZŁ brutto / pcs

The ring magnet with a hole MP 25x13x8 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. It is also often used in advertising for fixing signs and in workshops for organizing tools.

This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain great sensitivity. 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 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. Damage to the protective layer during assembly is the most common cause of rusting. 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. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.

The presented product is a ring magnet with dimensions Ø25 mm (outer diameter) and height 8 mm. The pulling force of this model is an impressive 10.49 kg, which translates to 102.90 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. In the case of connecting two rings, make sure one is turned the right way. 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 Nd₂Fe₁₄B magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

Their strength is durable, and after around ten years it decreases only by ~1% (theoretically),
They have excellent resistance to magnetism drop due to external fields,
A magnet with a smooth silver surface has an effective appearance,
Neodymium magnets generate maximum magnetic induction on a their surface, which allows for strong attraction,
Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
Possibility of accurate forming and optimizing to precise applications,
Universal use in future technologies – they are used in mass storage devices, electric drive systems, diagnostic systems, as well as complex engineering applications.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:

To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
We suggest cover - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complicated forms.
Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Additionally, tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Highest magnetic holding force – what affects it?

The declared magnet strength concerns the limit force, obtained under optimal environment, namely:

using a base made of low-carbon steel, functioning as a ideal flux conductor
possessing a massiveness of minimum 10 mm to avoid saturation
with a surface cleaned and smooth
with total lack of distance (no impurities)
for force acting at a right angle (in the magnet axis)
in stable room temperature

What influences lifting capacity in practice

Bear in mind that the application force may be lower influenced by the following factors, starting with the most relevant:

Air gap (betwixt the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of nominal force).
Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
Metal type – not every steel attracts identically. High carbon content worsen the attraction effect.
Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

Safety rules for work with neodymium magnets

Product not for children

Only for adults. Small elements pose a choking risk, leading to serious injuries. Store out of reach of children and animals.

Magnets are brittle

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Cards and drives

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

Avoid contact if allergic

Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness happens, immediately stop working with magnets and use protective gear.

GPS Danger

Remember: neodymium magnets generate a field that confuses precision electronics. Maintain a safe distance from your phone, tablet, and GPS.

Hand protection

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

Combustion hazard

Machining of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Pacemakers

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Immense force

Handle magnets consciously. Their powerful strength can surprise even professionals. Plan your moves and respect their power.

Heat sensitivity

Regular neodymium magnets (grade N) lose power when the temperature goes above 80°C. Damage is permanent.

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

MP 25x13x8 / N38 - ring magnet

Physical properties - MP 25x13x8 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical modeling of the assembly - report

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

Table 2: Sliding force (wall) MP 25x13x8 / N38

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

Table 4: Material efficiency (substrate influence) - power losses MP 25x13x8 / N38

Table 5: Thermal resistance (stability) - thermal limit MP 25x13x8 / N38

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

Table 7: Safety (HSE) (electronics) - precautionary measures MP 25x13x8 / N38

Table 8: Collisions (cracking risk) - warning MP 25x13x8 / N38

Table 9: Surface protection spec MP 25x13x8 / N38

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

Table 11: Submerged application MP 25x13x8 / N38

1. Wall mount (shear)

2. Steel saturation

3. Power loss vs temp

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

Chemical composition

Environmental data

Magnet pull force

Magnetic Induction

View also deals

HH 16x5.3 [M3] / N38 - through hole magnetic holder

UMC 42x7/4x9 / N38 - cylindrical magnetic holder

MPL 30x15x10 / N38 - lamellar magnet

SM 32x225 [2xM8] / N42 - magnetic separator

Advantages as well as disadvantages of Nd2Fe14B magnets.

Strengths

Cons

Pull force analysis

Highest magnetic holding force – what affects it?

What influences lifting capacity in practice

Safety rules for work with neodymium magnets

Product not for children

Magnets are brittle

Cards and drives

Avoid contact if allergic

GPS Danger

Hand protection

Combustion hazard

Pacemakers

Immense force

Heat sensitivity

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

Table 2: Sliding force (wall)
MP 25x13x8 / N38

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

Table 4: Material efficiency (substrate influence) - power losses
MP 25x13x8 / N38

Table 5: Thermal resistance (stability) - thermal limit
MP 25x13x8 / N38

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

Table 7: Safety (HSE) (electronics) - precautionary measures
MP 25x13x8 / N38

Table 8: Collisions (cracking risk) - warning
MP 25x13x8 / N38

Table 9: Surface protection spec
MP 25x13x8 / N38

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

Table 11: Submerged application
MP 25x13x8 / N38

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.