Product available Ships tomorrow

MP 12x8/4x3 / 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 030395

GTIN/EAN: 5906301812326

5.00

Diameter

12 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

2.26 g

Magnetization Direction

↑ axial

Load capacity

2.21 kg / 21.72 N

Magnetic Induction

277.09 mT / 2771 Gs

Coating

[NiCuNi] Nickel

view specifications »

1.427 ZŁ with VAT / pcs + price for transport

1.160 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

1.160 ZŁ

1.427 ZŁ

price from 550 pcs

1.090 ZŁ

1.341 ZŁ

price from 2200 pcs

1.021 ZŁ

1.256 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Hunting for a discount?

Pick up the phone and ask +48 22 499 98 98 or drop us a message by means of our online form through our site.
Specifications as well as form of magnets can be calculated using our magnetic calculator.

Orders submitted before 14:00 will be dispatched today!

Technical parameters of the product - MP 12x8/4x3 / N38 - ring magnet

Specification / characteristics - MP 12x8/4x3 / N38 - ring magnet

properties

properties	values
Cat. no.	030395
GTIN/EAN	5906301812326
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	12 mm [±0,1 mm]
internal diameter Ø	8/4 mm [±0,1 mm]
Height	3 mm [±0,1 mm]
Weight	2.26 g
Magnetization Direction	↑ axial
Load capacity ~ ?	2.21 kg / 21.72 N
Magnetic Induction ~ ?	277.09 mT / 2771 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 12x8/4x3 / 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 simulation of the magnet - report

These values represent the outcome of a physical analysis. Values rely on algorithms for the class Nd₂Fe₁₄B. Actual parameters may differ from theoretical values. Treat these data as a reference point when designing systems.

Table 1: Static pull force (pull vs distance) - characteristics
MP 12x8/4x3 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	2423 Gs 242.3 mT	2.21 kg / 4.87 pounds 2210.0 g / 21.7 N	strong
1 mm	2138 Gs 213.8 mT	1.72 kg / 3.79 pounds 1720.7 g / 16.9 N	weak grip
2 mm	1786 Gs 178.6 mT	1.20 kg / 2.65 pounds 1200.5 g / 11.8 N	weak grip
3 mm	1437 Gs 143.7 mT	0.78 kg / 1.71 pounds 777.8 g / 7.6 N	weak grip
5 mm	885 Gs 88.5 mT	0.29 kg / 0.65 pounds 294.7 g / 2.9 N	weak grip
10 mm	277 Gs 27.7 mT	0.03 kg / 0.06 pounds 28.9 g / 0.3 N	weak grip
15 mm	110 Gs 11.0 mT	0.00 kg / 0.01 pounds 4.6 g / 0.0 N	weak grip
20 mm	53 Gs 5.3 mT	0.00 kg / 0.00 pounds 1.1 g / 0.0 N	weak grip
30 mm	18 Gs 1.8 mT	0.00 kg / 0.00 pounds 0.1 g / 0.0 N	weak grip
50 mm	4 Gs 0.4 mT	0.00 kg / 0.00 pounds 0.0 g / 0.0 N	weak grip

Pulling power decreases drastically with every mm of distance. Remember that even a microscopic distance (e.g., contamination, varnish, dust) significantly reduces the pull force. Neodymiums hold optimally in perfect adhesion; air break weakens the force. Notice how flashily the pull force fall, when the product does not touch directly to the steel surface. When calculating the assembly, avoid redundant distances.

Table 2: Shear force (wall)
MP 12x8/4x3 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	0.44 kg / 0.97 pounds 442.0 g / 4.3 N
1 mm	Stal (~0.2)	0.34 kg / 0.76 pounds 344.0 g / 3.4 N
2 mm	Stal (~0.2)	0.24 kg / 0.53 pounds 240.0 g / 2.4 N
3 mm	Stal (~0.2)	0.16 kg / 0.34 pounds 156.0 g / 1.5 N
5 mm	Stal (~0.2)	0.06 kg / 0.13 pounds 58.0 g / 0.6 N
10 mm	Stal (~0.2)	0.01 kg / 0.01 pounds 6.0 g / 0.1 N
15 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N

The table below shows the theoretical weight limit necessary to start the downward movement of the magnet down on a upright steel wall (considering typical friction coefficient). This value depends on the air gap between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MP 12x8/4x3 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.66 kg / 1.46 pounds 663.0 g / 6.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.44 kg / 0.97 pounds 442.0 g / 4.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.22 kg / 0.49 pounds 221.0 g / 2.2 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.11 kg / 2.44 pounds 1105.0 g / 10.8 N

When mounting a holder on a upright surface (e.g., a fridge), it will maintain only about 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient mean that products slide down easier than they detach. Designing a vertical fastening? Note that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the element will slide down under a noticeably lighter cargo. Utilizing a rubberized layer can drastically increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 12x8/4x3 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.22 kg / 0.49 pounds 221.0 g / 2.2 N
1 mm	25%	0.55 kg / 1.22 pounds 552.5 g / 5.4 N
2 mm	50%	1.11 kg / 2.44 pounds 1105.0 g / 10.8 N
3 mm	75%	1.66 kg / 3.65 pounds 1657.5 g / 16.3 N
5 mm	100%	2.21 kg / 4.87 pounds 2210.0 g / 21.7 N
10 mm	100%	2.21 kg / 4.87 pounds 2210.0 g / 21.7 N
11 mm	100%	2.21 kg / 4.87 pounds 2210.0 g / 21.7 N
12 mm	100%	2.21 kg / 4.87 pounds 2210.0 g / 21.7 N

A too thin steel is unable to focus the entire magnetic field, which squanders power of the holder. If you install a neodymium to a too thin substrate, the flux will penetrate right through and the attraction force will be weaker. To achieve the maximum of this neodymium's power, you require a sufficiently solid backing of metal. The material oversaturation causes that on delicate walls (e.g., appliance housings), the product works worse. We advise picking the steel thickness based on the following data.

Table 5: Thermal stability (material behavior) - power drop
MP 12x8/4x3 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	2.21 kg / 4.87 pounds 2210.0 g / 21.7 N	OK
40 °C	-2.2%	2.16 kg / 4.77 pounds 2161.4 g / 21.2 N	OK
60 °C	-4.4%	2.11 kg / 4.66 pounds 2112.8 g / 20.7 N
80 °C	-6.6%	2.06 kg / 4.55 pounds 2064.1 g / 20.2 N
100 °C	-28.8%	1.57 kg / 3.47 pounds 1573.5 g / 15.4 N

Classic neodymiums irreversibly lose parameters after exceeding the maximum temperature. Avoid high temperatures – heat can irreversibly demagnetize this product. With increasing heat, the neodymium's power momentarily decreases. Refrain from using this product close to heaters higher than its working range. Exceeding the critical threshold will lead to irreversible degradation of magnetism.

*Important note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) may lose charge permanently sooner compared to rod magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 12x8/4x3 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Lateral Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	3.09 kg / 6.82 pounds 4 010 Gs	0.46 kg / 1.02 pounds 464 g / 4.6 N	N/A
1 mm	2.77 kg / 6.12 pounds 4 589 Gs	0.42 kg / 0.92 pounds 416 g / 4.1 N	2.50 kg / 5.50 pounds ~0 Gs
2 mm	2.41 kg / 5.31 pounds 4 276 Gs	0.36 kg / 0.80 pounds 361 g / 3.5 N	2.17 kg / 4.78 pounds ~0 Gs
3 mm	2.03 kg / 4.48 pounds 3 930 Gs	0.31 kg / 0.67 pounds 305 g / 3.0 N	1.83 kg / 4.04 pounds ~0 Gs
5 mm	1.36 kg / 3.00 pounds 3 216 Gs	0.20 kg / 0.45 pounds 204 g / 2.0 N	1.23 kg / 2.70 pounds ~0 Gs
10 mm	0.41 kg / 0.91 pounds 1 770 Gs	0.06 kg / 0.14 pounds 62 g / 0.6 N	0.37 kg / 0.82 pounds ~0 Gs
20 mm	0.04 kg / 0.09 pounds 554 Gs	0.01 kg / 0.01 pounds 6 g / 0.1 N	0.04 kg / 0.08 pounds ~0 Gs
50 mm	0.00 kg / 0.00 pounds 58 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
60 mm	0.00 kg / 0.00 pounds 35 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
70 mm	0.00 kg / 0.00 pounds 23 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
80 mm	0.00 kg / 0.00 pounds 16 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
90 mm	0.00 kg / 0.00 pounds 11 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
100 mm	0.00 kg / 0.00 pounds 8 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs

Two magnets attract each other from a significantly greater distance than a magnet and steel setup. The connection of magnet-to-magnet produces a massive flux and a wider radius of performance. Planning to create a strong closure? Utilize two neodymiums instead of one magnet and a steel. Exercise caution that when bringing together two magnets, the impact force is massive. The levitation is marginally weaker than the attraction, but still significant.
*Flux density for N-N configuration drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
* Results show shear force of two identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - warnings
MP 12x8/4x3 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	5.0 cm
Hearing aid	10 Gs (1.0 mT)	4.0 cm
Timepiece	20 Gs (2.0 mT)	3.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	2.5 cm
Remote	50 Gs (5.0 mT)	2.5 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Extremely neodym field is a large risk to electronics and medical implants. These neodymiums generate a flux that prevents correct functioning of digital equipment. Notice: the unseen radiation acts through matter and housings. Increased vigilance must be taken by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - collision effects
MP 12x8/4x3 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	31.79 km/h (8.83 m/s)	0.09 J
30 mm	54.63 km/h (15.17 m/s)	0.26 J
50 mm	70.52 km/h (19.59 m/s)	0.43 J
100 mm	99.73 km/h (27.70 m/s)	0.87 J

Neodymium magnets are prone to chipping – a collision with steel risks their cracking. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or injury to skin. Hold the magnet firmly during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Surface protection spec
MP 12x8/4x3 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MP 12x8/4x3 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	2 466 Mx	24.7 µWb
P_c Coefficient	0.32	Low (Flat)

Total magnetic flux emitted by the magnet pole. Key data in coil applications and motors. The P_c coefficient determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MP 12x8/4x3 / N38

Environment	Effective steel pull	Effect
Air (land)	2.21 kg	Standard
Water (riverbed)	2.53 kg (+0.32 kg buoyancy gain)	+14.5%

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

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

1. Shear force

*Caution: On a vertical surface, the magnet holds just approx. 20-30% of its max power.

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Heat tolerance

*For N38 material, 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) = 0.32

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: 030395-2026

Magnet Unit Converter

Magnet pull force

Newtons (N)

Pounds (lbs)

Field Strength

Gauss (Gs)

Tesla (T)

Simply populate a single box, to let the tool fill in the rest for you.

Check out more proposals

Product available Ships tomorrow

MW 20x2 / N38 - cylindrical magnet

2.08 ZŁ brutto / pcs

Product available Ships tomorrow

MPL 3x3x1 / N38 - lamellar magnet

0.1845 ZŁ brutto / pcs

Product available Ships tomorrow

BM 850x180x70 [4x M8] - magnetic beam

7729.93 ZŁ brutto / pcs

Product available Ships tomorrow

MW 16x3 / N38 - cylindrical magnet

1.734 ZŁ brutto / pcs

The ring magnet with a hole MP 12x8/4x3 / N38 is created for permanent mounting, 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. This product with a force of 2.21 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.

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 8/4 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 (12 mm), so it doesn't protrude beyond the outline.

It is a magnetic ring with a diameter of 12 mm and thickness 3 mm. The pulling force of this model is an impressive 2.21 kg, which translates to 21.72 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 8/4 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.

Pros and cons of neodymium magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:

They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
They do not lose their magnetic properties even under external field action,
A magnet with a smooth gold surface has better aesthetics,
They feature high magnetic induction at the operating surface, which affects their effectiveness,
Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
Thanks to the option of free shaping and customization to specialized needs, NdFeB magnets can be modeled in a wide range of forms and dimensions, which increases their versatility,
Huge importance in future technologies – they are used in HDD drives, electromotive mechanisms, medical devices, and other advanced devices.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:

They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
When exposed to humidity, magnets start to 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 making nuts in the magnet and complex forms - preferred is a housing - magnetic holder.
Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical in case of swallowing.
With mass production the cost of neodymium magnets can be a barrier,

Lifting parameters

Maximum magnetic pulling force – what it depends on?

The lifting capacity listed is a measurement result conducted under specific, ideal conditions:

on a base made of structural steel, optimally conducting the magnetic field
with a thickness minimum 10 mm
with a plane perfectly flat
under conditions of gap-free contact (surface-to-surface)
during pulling in a direction vertical to the plane
at temperature room level

Lifting capacity in practice – influencing factors

Effective lifting capacity is influenced by working environment parameters, including (from most important):

Clearance – the presence of any layer (paint, dirt, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
Plate thickness – insufficiently thick plate does not close the flux, causing part of the power to be escaped into the air.
Plate material – mild steel attracts best. Alloy steels lower magnetic properties and holding force.
Smoothness – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
Thermal environment – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.

Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Precautions when working with NdFeB magnets

Cards and drives

Intense magnetic fields can destroy records on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Dust is flammable

Powder produced during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Magnets are brittle

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets leads to them cracking into shards.

Power loss in heat

Avoid heat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, look for special high-temperature series (H, SH, UH).

ICD Warning

For implant holders: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or request help to handle the magnets.

Nickel allergy

Medical facts indicate that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, prevent direct skin contact and select coated magnets.

Powerful field

Handle magnets with awareness. Their powerful strength can shock even professionals. Plan your moves and respect their power.

Pinching danger

Big blocks can break fingers instantly. Under no circumstances put your hand between two strong magnets.

This is not a toy

Always keep magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are life-threatening.

Threat to navigation

Note: neodymium magnets generate a field that interferes with sensitive sensors. Maintain a safe distance from your mobile, tablet, and navigation systems.

Warning! Want to know more? Check our post: Are neodymium magnets dangerous?

MP 12x8/4x3 / N38 - ring magnet

Technical parameters of the product - MP 12x8/4x3 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the magnet - report

Table 1: Static pull force (pull vs distance) - characteristics MP 12x8/4x3 / N38

Table 2: Shear force (wall) MP 12x8/4x3 / N38

Table 3: Vertical assembly (sliding) - vertical pull MP 12x8/4x3 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection MP 12x8/4x3 / N38

Table 5: Thermal stability (material behavior) - power drop MP 12x8/4x3 / N38

Table 6: Magnet-Magnet interaction (attraction) - field range MP 12x8/4x3 / N38

Table 7: Safety (HSE) (implants) - warnings MP 12x8/4x3 / N38

Table 8: Dynamics (cracking risk) - collision effects MP 12x8/4x3 / N38

Table 9: Surface protection spec MP 12x8/4x3 / N38

Table 10: Electrical data (Flux) MP 12x8/4x3 / N38

Table 11: Hydrostatics and buoyancy MP 12x8/4x3 / N38

1. Shear force

2. Plate thickness effect

3. Heat tolerance

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

Chemical composition

Sustainability

Magnet pull force

Field Strength

Check out more proposals

MW 20x2 / N38 - cylindrical magnet

MPL 3x3x1 / N38 - lamellar magnet

BM 850x180x70 [4x M8] - magnetic beam

MW 16x3 / N38 - cylindrical magnet

Pros and cons of neodymium magnets.

Pros

Limitations

Lifting parameters

Maximum magnetic pulling force – what it depends on?

Lifting capacity in practice – influencing factors

Precautions when working with NdFeB magnets

Cards and drives

Dust is flammable

Magnets are brittle

Power loss in heat

ICD Warning

Nickel allergy

Powerful field

Pinching danger

This is not a toy

Threat to navigation

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs distance) - characteristics
MP 12x8/4x3 / N38

Table 2: Shear force (wall)
MP 12x8/4x3 / N38

Table 3: Vertical assembly (sliding) - vertical pull
MP 12x8/4x3 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 12x8/4x3 / N38

Table 5: Thermal stability (material behavior) - power drop
MP 12x8/4x3 / N38

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 12x8/4x3 / N38

Table 7: Safety (HSE) (implants) - warnings
MP 12x8/4x3 / N38

Table 8: Dynamics (cracking risk) - collision effects
MP 12x8/4x3 / N38

Table 9: Surface protection spec
MP 12x8/4x3 / N38

Table 10: Electrical data (Flux)
MP 12x8/4x3 / N38

Table 11: Hydrostatics and buoyancy
MP 12x8/4x3 / N38