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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

product specifications »

1.427 ZŁ with VAT / pcs + price for transport

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Technical - 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

Technical analysis of the product - report

These information represent the direct effect of a mathematical simulation. Values rely on models for the material Nd₂Fe₁₄B. Operational conditions may differ from theoretical values. Use these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs gap) - 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	strong
1 mm	2138 Gs 213.8 mT	1.72 kg / 1720.7 g 16.9 N	low risk
2 mm	1786 Gs 178.6 mT	1.20 kg / 1200.5 g 11.8 N	low risk
3 mm	1437 Gs 143.7 mT	0.78 kg / 777.8 g 7.6 N	low risk
5 mm	885 Gs 88.5 mT	0.29 kg / 294.7 g 2.9 N	low risk
10 mm	277 Gs 27.7 mT	0.03 kg / 28.9 g 0.3 N	low risk
15 mm	110 Gs 11.0 mT	0.00 kg / 4.6 g 0.0 N	low risk
20 mm	53 Gs 5.3 mT	0.00 kg / 1.1 g 0.0 N	low risk
30 mm	18 Gs 1.8 mT	0.00 kg / 0.1 g 0.0 N	low risk
50 mm	4 Gs 0.4 mT	0.00 kg / 0.0 g 0.0 N	low risk

Magnetic force drops significantly with every mm of gap. Keep in mind that even a microscopic distance (e.g., dirt, varnish, rust) strongly reduces the pull force. Magnetic products hold most effectively during direct contact; air break weakens the power. Observe how rapidly the load capacity plummet, when the product does not touch flatly to the steel surface. When planning the arrangement, discard additional spacers.

Table 2: Shear load (vertical surface)
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 following data indicates the approximate weight limit needed to cause the sliding of the magnet vertically along a vertical metal surface (assuming typical friction). This value is relative to the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - 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 hanging a element on a upright wall (e.g., a board), it will only hold barely about 1/5 of its maximum pull force. Gravity as well as a weak degree of grip cause that holders move down easier than they pull off. Want to create a wall mount? Consider that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a significantly smaller load. Utilizing a rubberized coating can effectively improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
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 thin sheet is not enough to conduct the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a thin surface, the flux will pass right through and the holding will be smaller. To squeeze full efficiency of this magnet's potential, you need a suitably thick backing of steel. The saturation effect causes that on delicate walls (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel dimension according to the table below.

Table 5: Thermal resistance (stability) - power drop
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

Classic neodymiums change their properties strength after exceeding the maximum temperature. Watch out for overheating – heat can permanently damage this magnet. With increasing heat, the magnet's power momentarily drops. Avoid using this magnet in hot environments higher than its working range. Too high temperature will result in destruction of magnetism.

*Engineering note: Temperature resistance is determined by both grade, but also on the magnet's shape. Flat magnets (low Pc) are more susceptible to demagnetization sooner compared to rod magnets. Red status in the table indicates permanent field degradation for this particular item.

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 magnetic products interact from a significantly greater distance than a neodymium and metal combination. Such a system of magnet-to-magnet generates a stronger field and a further horizon of action. Planning to create a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the collision energy is massive. The levitation is a bit weaker than the connection force, but still large.
*The magnetic induction in repulsion mode reaches ~0 Gs at the midpoint of the gap (due to field cancellation).

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
Car key	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

Powerful magnet radiation poses a large risk to electronics and pacemakers. These magnets generate a flux that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field acts through matter and plastic. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

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 very brittle – a violent impact against metal risks their cracking. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy can trigger coating fragments or dangerous crushing to skin. Be sure to control the product during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear eye protection when working with large magnets.

Table 9: Corrosion resistance
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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction 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)

Flux value emitted by the pole surface. Essential parameter in coil applications and motors. The P_c coefficient defines the working geometry.

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: 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. Shear force

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

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Power loss vs temp

*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

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

Technical and environmental data

Material specification

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: 030395-2025

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The ring magnet with a hole MP 12x8/4x3 / N38 is created for permanent mounting, 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 door latch, speaker holder, or spacer 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. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.

The inner hole diameter determines the maximum size of the mounting element. 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.

This model is characterized by dimensions Ø12x3 mm and a weight of 2.26 g. 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.

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.

Strengths as well as weaknesses of rare earth magnets.

Strengths

Besides their remarkable strength, neodymium magnets offer the following advantages:

They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (according to literature),
Neodymium magnets are characterized by exceptionally resistant to magnetic field loss caused by magnetic disturbances,
In other words, due to the aesthetic finish of silver, the element looks attractive,
Magnets possess excellent magnetic induction on the active area,
Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
Due to the option of accurate forming and adaptation to unique solutions, magnetic components can be created in a wide range of forms and dimensions, which increases their versatility,
Key role in electronics industry – they find application in hard drives, electromotive mechanisms, advanced medical instruments, and complex engineering applications.
Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in compact constructions

Cons

Drawbacks and weaknesses of neodymium magnets and proposals for their use:

Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
We suggest a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
Health risk resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these products can be problematic in diagnostics medical when they are in the body.
Due to complex production process, their price exceeds standard values,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what affects it?

Breakaway force was defined for optimal configuration, taking into account:

on a plate made of mild steel, perfectly concentrating the magnetic field
with a thickness no less than 10 mm
with an ground contact surface
without the slightest insulating layer between the magnet and steel
under perpendicular force vector (90-degree angle)
at ambient temperature room level

Practical lifting capacity: influencing factors

In real-world applications, the actual lifting capacity is determined by a number of factors, listed from the most important:

Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
Steel thickness – too thin plate does not accept the full field, causing part of the flux to be wasted into the air.
Steel type – low-carbon steel attracts best. Alloy admixtures decrease magnetic permeability and lifting capacity.
Base smoothness – the more even the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was determined using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the holding force is lower. In addition, even a slight gap between the magnet and the plate reduces the holding force.

H&S for magnets

Eye protection

Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Permanent damage

Monitor thermal conditions. Heating the magnet to high heat will permanently weaken its properties and strength.

Warning for allergy sufferers

Some people suffer from a sensitization to Ni, which is the typical protective layer for neodymium magnets. Prolonged contact might lead to an allergic reaction. We recommend use safety gloves.

Implant safety

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

Keep away from electronics

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

Do not underestimate power

Handle with care. Rare earth magnets attract from a long distance and snap with massive power, often faster than you can move away.

Danger to the youngest

Absolutely store magnets away from children. Risk of swallowing is high, and the effects of magnets connecting inside the body are very dangerous.

Do not drill into magnets

Mechanical processing of NdFeB material carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Bone fractures

Mind your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Cards and drives

Do not bring magnets near a purse, computer, or screen. The magnetism can destroy these devices and erase data from cards.

Warning! Looking for details? Check our post: Why are neodymium magnets dangerous?

MP 12x8/4x3 / N38 - ring magnet

Technical - MP 12x8/4x3 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical analysis of the product - report

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

Table 2: Shear load (vertical surface) MP 12x8/4x3 / N38

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

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

Table 5: Thermal resistance (stability) - power drop 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: Dynamics (cracking risk) - collision effects MP 12x8/4x3 / N38

Table 9: Corrosion resistance MP 12x8/4x3 / N38

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

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

1. Shear force

2. Plate thickness effect

3. Power loss vs temp

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

Material specification

Environmental data

Force (pull)

Field Strength

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Strengths as well as weaknesses of rare earth magnets.

Strengths

Cons

Holding force characteristics

Maximum lifting force for a neodymium magnet – what affects it?

Practical lifting capacity: influencing factors

H&S for magnets

Eye protection

Permanent damage

Warning for allergy sufferers

Implant safety

Keep away from electronics

Do not underestimate power

Danger to the youngest

Do not drill into magnets

Bone fractures

Cards and drives

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

Table 2: Shear load (vertical surface)
MP 12x8/4x3 / N38

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

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

Table 5: Thermal resistance (stability) - power drop
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: Dynamics (cracking risk) - collision effects
MP 12x8/4x3 / N38

Table 9: Corrosion resistance
MP 12x8/4x3 / N38

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

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