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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: 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

1.427 ZŁ with VAT / pcs + price for transport

1.160 ZŁ net + 23% VAT / pcs

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Product card - 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 analysis of the product - data

The following values represent the outcome of a engineering calculation. Values were calculated on models for the material Nd₂Fe₁₄B. Real-world conditions may differ. Please consider these data as a preliminary roadmap when designing systems.

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

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

Grip strength weakens drastically per each millimeter of spacing. Note that even a microscopic distance (e.g., contamination, varnish, rust) significantly weakens the grip. Magnetic products work optimally in perfect adhesion; air break nullifies the power. Notice how quickly the load capacity plummet, when the product does not touch directly to the metal substrate. When planning the mounting, discard redundant distances.

Table 2: Slippage load (wall)
MP 12x8/4x3 / N38

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

The table below defines the estimated weight limit sufficient to start the shifting of the magnet downwards along a upright metal surface (considering standard friction). This value depends on the separation distance 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)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.66 kg / 663.0 g 6.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.44 kg / 442.0 g 4.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.22 kg / 221.0 g 2.2 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.11 kg / 1105.0 g 10.8 N

When mounting a holder on a vertical wall (e.g., a car body), it will only hold barely about 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient influence the fact that magnets slip faster than they pull off. Planning a hanger? Remember that the shear force is much weaker than the maximum static pull force. On a slippery surface, the holder will slip down under a noticeably lighter weight. Utilizing a rubberized coating can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MP 12x8/4x3 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.22 kg / 221.0 g 2.2 N
1 mm	25%	0.55 kg / 552.5 g 5.4 N
2 mm	50%	1.11 kg / 1105.0 g 10.8 N
5 mm	100%	2.21 kg / 2210.0 g 21.7 N
10 mm	100%	2.21 kg / 2210.0 g 21.7 N

A too thin steel is incapable of take in the full magnetic flux, which wastes potential of the holder. If you mount a strong magnet to a too thin substrate, the field will penetrate right through and the attraction force will be weaker. To achieve full efficiency of this magnet's power, you need a suitably thick element of metal. The material oversaturation means that on sheet metal structures (e.g., appliance housings), the holder shows lower pull force. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MP 12x8/4x3 / N38

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

Ordinary NdFeB products irreversibly lose strength above the temperature limit. Avoid high temperatures – high temperature can permanently damage this product. As the temperature rises, the magnet's capacity temporarily decreases. Avoid using this magnet close to heaters higher than its working range. Exceeding the critical threshold will result in permanent loss of magnetism.

*Engineering note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) risk losing magnetic properties at lower temperatures than long magnets. Warning indicator in the table points to a risk of irreversible loss for this specific geometry.

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

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	3.09 kg / 3092 g 30.3 N 4 010 Gs	N/A
1 mm	2.77 kg / 2774 g 27.2 N 4 589 Gs	2.50 kg / 2496 g 24.5 N ~0 Gs
2 mm	2.41 kg / 2408 g 23.6 N 4 276 Gs	2.17 kg / 2167 g 21.3 N ~0 Gs
3 mm	2.03 kg / 2034 g 20.0 N 3 930 Gs	1.83 kg / 1831 g 18.0 N ~0 Gs
5 mm	1.36 kg / 1362 g 13.4 N 3 216 Gs	1.23 kg / 1226 g 12.0 N ~0 Gs
10 mm	0.41 kg / 412 g 4.0 N 1 770 Gs	0.37 kg / 371 g 3.6 N ~0 Gs
20 mm	0.04 kg / 40 g 0.4 N 554 Gs	0.04 kg / 36 g 0.4 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 58 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnets interact from a wider radius than a neodymium and metal setup. The connection of two magnets creates a more powerful interaction and a wider radius of operation. Planning to create a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Remember that when bringing together two magnets, the pinch force is huge. The levitation is a bit weaker than the connection force, but still large.
*The magnetic induction between like poles is approximately ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).

Table 7: Protective zones (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 electronic devices as well as pacemakers. These neodymiums produce a flux that destroys function of digital equipment. Notice: the unseen radiation penetrates the body and housings. Exceptional care must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
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

Magnetic elements are prone to chipping – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely turns into a projectile. Kinetic force can destroy the magnet or dangerous crushing to skin. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when handling with large magnets.

Table 9: Anti-corrosion coating durability
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)

The following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (P_c)
MP 12x8/4x3 / N38

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

Flux value emitted by the magnet pole. Key data when building generators and motors. P_c value defines the working geometry.

Table 11: Underwater work (magnet fishing)
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%

Corrosion 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. However, remember the water resistance when pulling the rope quickly.

1. Vertical hold

*Warning: On a vertical wall, the magnet retains just a fraction of its nominal pull.

2. Efficiency vs thickness

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

3. Heat tolerance

*For standard magnets, the safety limit 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: 030395-2025

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The ring magnet with a hole MP 12x8/4x3 / 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 2.21 kg works great as a cabinet closure, speaker holder, or mounting element in devices.

This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a flexible washer 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 easily scratched when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.

A screw or bolt with a thread diameter smaller than 8/4 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.

This model is characterized by dimensions Ø12x3 mm and a weight of 2.26 g. The key parameter here is the holding force amounting to approximately 2.21 kg (force ~21.72 N). The mounting hole diameter is precisely 8/4 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of neodymium magnets.

Benefits

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

They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
They have excellent resistance to magnetic field loss due to external fields,
In other words, due to the reflective surface of silver, the element looks attractive,
They are known for high magnetic induction at the operating surface, making them more effective,
Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
Thanks to the ability of free forming and adaptation to individualized projects, neodymium magnets can be produced in a broad palette of shapes and sizes, which makes them more universal,
Significant place in electronics industry – they are commonly used in data components, electric motors, precision medical tools, as well as technologically advanced constructions.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Problematic aspects of neodymium magnets and proposals for their use:

They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
We recommend a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. Additionally, small elements of these devices can be problematic in diagnostics medical in case of swallowing.
With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what it depends on?

The lifting capacity listed is a theoretical maximum value performed under the following configuration:

with the application of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
whose transverse dimension is min. 10 mm
characterized by smoothness
under conditions of gap-free contact (surface-to-surface)
during pulling in a direction perpendicular to the plane
in temp. approx. 20°C

Magnet lifting force in use – key factors

Please note that the working load will differ depending on elements below, in order of importance:

Clearance – existence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
Plate thickness – too thin plate causes magnetic saturation, causing part of the flux to be escaped to the other side.
Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
Surface condition – ground elements ensure maximum contact, which increases force. Rough surfaces weaken the grip.
Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was assessed using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the holding force.

Warnings

This is not a toy

NdFeB magnets are not toys. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which constitutes a critical condition and necessitates urgent medical intervention.

Handling rules

Be careful. Rare earth magnets act from a distance and snap with huge force, often quicker than you can move away.

Risk of cracking

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Physical harm

Pinching hazard: The attraction force is so immense that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.

Implant safety

Individuals with a pacemaker should keep an absolute distance from magnets. The magnetism can disrupt the functioning of the life-saving device.

Do not overheat magnets

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Precision electronics

A powerful magnetic field disrupts the operation of compasses in smartphones and GPS navigation. Keep magnets near a smartphone to prevent breaking the sensors.

Do not drill into magnets

Machining of NdFeB material carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Cards and drives

Very strong magnetic fields can erase data on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Metal Allergy

Studies show that nickel (the usual finish) is a potent allergen. If you have an allergy, avoid direct skin contact or opt for coated magnets.

Important! Looking for details? Read our article: Why are neodymium magnets dangerous?

MP 12x8/4x3 / N38 - ring magnet

Product card - MP 12x8/4x3 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the product - data

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

Table 2: Slippage load (wall) MP 12x8/4x3 / N38

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

Table 4: Material efficiency (substrate influence) - power losses MP 12x8/4x3 / N38

Table 5: Thermal resistance (material behavior) - thermal limit MP 12x8/4x3 / N38

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

Table 7: Protective zones (implants) - warnings MP 12x8/4x3 / N38

Table 8: Impact energy (cracking risk) - warning MP 12x8/4x3 / N38

Table 9: Anti-corrosion coating durability MP 12x8/4x3 / N38

Table 10: Construction data (Pc) MP 12x8/4x3 / N38

Table 11: Underwater work (magnet fishing) MP 12x8/4x3 / N38

1. Vertical hold

2. Efficiency vs thickness

3. Heat tolerance

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

Chemical composition

Sustainability

Magnet pull force

Magnetic Field

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Advantages and disadvantages of neodymium magnets.

Benefits

Limitations

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what it depends on?

Magnet lifting force in use – key factors

Warnings

This is not a toy

Handling rules

Risk of cracking

Physical harm

Implant safety

Do not overheat magnets

Precision electronics

Do not drill into magnets

Cards and drives

Metal Allergy

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

Table 2: Slippage load (wall)
MP 12x8/4x3 / N38

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

Table 4: Material efficiency (substrate influence) - power losses
MP 12x8/4x3 / N38

Table 5: Thermal resistance (material behavior) - thermal limit
MP 12x8/4x3 / N38

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

Table 7: Protective zones (implants) - warnings
MP 12x8/4x3 / N38

Table 8: Impact energy (cracking risk) - warning
MP 12x8/4x3 / N38

Table 9: Anti-corrosion coating durability
MP 12x8/4x3 / N38

Table 10: Construction data (P_c)
MP 12x8/4x3 / N38

Table 11: Underwater work (magnet fishing)
MP 12x8/4x3 / N38