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MP 12x8/4x3 / N38 - ring magnet

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

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1.427 ZŁ with VAT / pcs + price for transport

1.160 ZŁ net + 23% VAT / pcs

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Technical data 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

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 assembly - report

Presented data constitute the result of a physical simulation. Results were calculated on models for the material Nd2Fe14B. Actual parameters may differ. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - interaction chart
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 LBS
2210.0 g / 21.7 N
 medium risk
1 mm 2138 Gs
213.8 mT
 1.72 kg / 3.79 LBS
1720.7 g / 16.9 N
 weak grip
2 mm 1786 Gs
178.6 mT
 1.20 kg / 2.65 LBS
1200.5 g / 11.8 N
 weak grip
3 mm 1437 Gs
143.7 mT
 0.78 kg / 1.71 LBS
777.8 g / 7.6 N
 weak grip
5 mm 885 Gs
88.5 mT
 0.29 kg / 0.65 LBS
294.7 g / 2.9 N
 weak grip
10 mm 277 Gs
27.7 mT
 0.03 kg / 0.06 LBS
28.9 g / 0.3 N
 weak grip
15 mm 110 Gs
11.0 mT
 0.00 kg / 0.01 LBS
4.6 g / 0.0 N
 weak grip
20 mm 53 Gs
5.3 mT
 0.00 kg / 0.00 LBS
1.1 g / 0.0 N
 weak grip
30 mm 18 Gs
1.8 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 weak grip
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
Magnetic force drops sharply with every mm of gap. Remember that every additional insulation layer (e.g., dirt, varnish, dust) noticeably reduces the pull force. Magnets work optimally in perfect adhesion; gap drastically cuts the force. See how quickly the load capacity drop, when the product does not touch flatly to the steel surface. When planning the mounting, discard additional spacers.

Table 2: Slippage hold (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 LBS
442.0 g / 4.3 N
1 mm Stal (~0.2) 0.34 kg / 0.76 LBS
344.0 g / 3.4 N
2 mm Stal (~0.2) 0.24 kg / 0.53 LBS
240.0 g / 2.4 N
3 mm Stal (~0.2) 0.16 kg / 0.34 LBS
156.0 g / 1.5 N
5 mm Stal (~0.2) 0.06 kg / 0.13 LBS
58.0 g / 0.6 N
10 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The following data indicates the approximate shear load required to cause the shifting of the magnet downwards along a vertical steel wall (assuming standard friction coefficient). 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/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.66 kg / 1.46 LBS
663.0 g / 6.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.44 kg / 0.97 LBS
442.0 g / 4.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.22 kg / 0.49 LBS
221.0 g / 2.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.11 kg / 2.44 LBS
1105.0 g / 10.8 N
When placing a holder on a vertical surface (e.g., a board), it will maintain just about 20%-30% of its maximum pull force. Gravitational force and a low friction coefficient mean that products slide down easier than they pull off. Designing a hanger? Consider that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the holder will give way down under a noticeably lighter weight. Using a rubber layer can drastically improve the result.

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

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.22 kg / 0.49 LBS
221.0 g / 2.2 N
1 mm
25%
 0.55 kg / 1.22 LBS
552.5 g / 5.4 N
2 mm
50%
 1.11 kg / 2.44 LBS
1105.0 g / 10.8 N
3 mm
75%
 1.66 kg / 3.65 LBS
1657.5 g / 16.3 N
5 mm
100%
 2.21 kg / 4.87 LBS
2210.0 g / 21.7 N
10 mm
100%
 2.21 kg / 4.87 LBS
2210.0 g / 21.7 N
11 mm
100%
 2.21 kg / 4.87 LBS
2210.0 g / 21.7 N
12 mm
100%
 2.21 kg / 4.87 LBS
2210.0 g / 21.7 N
A thin sheet is not enough to focus the full magnetic flux, which squanders power of the magnet. If you install a neodymium to a thin surface, the magnetism will pass right through and the holding will be smaller. To achieve the maximum of this magnet's power, you require a sufficiently solid element of metal. The saturation effect means that on delicate walls (e.g., car bodies), the product holds weaker. We suggest choosing the steel dimension based on the following data.

Table 5: Thermal resistance (stability) - resistance threshold
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 LBS
2210.0 g / 21.7 N
 OK
40 °C -2.2% 2.16 kg / 4.77 LBS
2161.4 g / 21.2 N
 OK
60 °C -4.4% 2.11 kg / 4.66 LBS
2112.8 g / 20.7 N
80 °C -6.6% 2.06 kg / 4.55 LBS
2064.1 g / 20.2 N
100 °C -28.8% 1.57 kg / 3.47 LBS
1573.5 g / 15.4 N
Ordinary NdFeB products irreversibly lose power past the thermal threshold. Watch out for overheating – excessive heat can permanently destroy this magnet. With every degree above norm, the magnet's capacity temporarily drops. Avoid using this magnet in hot environments higher than its operating temperature limit. Ignoring the limit will result in irreversible degradation of magnetism.
*Technical advisory: Heat tolerance is determined by both grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) may lose charge permanently sooner compared to rod magnets. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
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 LBS
4 010 Gs
0.46 kg / 1.02 LBS
464 g / 4.6 N
 N/A
1 mm 2.77 kg / 6.12 LBS
4 589 Gs
0.42 kg / 0.92 LBS
416 g / 4.1 N
 2.50 kg / 5.50 LBS
~0 Gs
2 mm 2.41 kg / 5.31 LBS
4 276 Gs
0.36 kg / 0.80 LBS
361 g / 3.5 N
 2.17 kg / 4.78 LBS
~0 Gs
3 mm 2.03 kg / 4.48 LBS
3 930 Gs
0.31 kg / 0.67 LBS
305 g / 3.0 N
 1.83 kg / 4.04 LBS
~0 Gs
5 mm 1.36 kg / 3.00 LBS
3 216 Gs
0.20 kg / 0.45 LBS
204 g / 2.0 N
 1.23 kg / 2.70 LBS
~0 Gs
10 mm 0.41 kg / 0.91 LBS
1 770 Gs
0.06 kg / 0.14 LBS
62 g / 0.6 N
 0.37 kg / 0.82 LBS
~0 Gs
20 mm 0.04 kg / 0.09 LBS
554 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
 0.04 kg / 0.08 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
58 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
35 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
23 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
16 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
11 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
8 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a magnet and sheet combination. The setup of magnet-to-magnet generates a stronger field and a wider radius of action. Want to build a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is massive. The repulsion force is slightly lower than the attraction, but still large.
*Flux density for N-N configuration reaches ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
* Results apply to sliding force of dual matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (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
Mobile device 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 real danger to IT equipment and medical implants. These neodymiums generate a flux that destroys function of sensitive medical devices. Remember: the unseen radiation acts through matter and plastic. Exceptional care must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
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 neodymium left loose becomes dangerous. Kinetic force can cause material chips or injury to fingers. Always hold the magnet during installation so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when working with powerful specimens.

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. Note the thickness of the protective layer.

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

Parameter Value SI Unit / Description
Magnetic Flux 2 466 Mx 24.7 µWb
Pc Coefficient 0.32 Low (Flat)
Flux value passing through the magnet pole. Essential parameter when building generators and motors. The Pc coefficient determines the working geometry.

Table 11: Physics of underwater searching
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.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Warning: On a vertical surface, the magnet retains just a fraction of its perpendicular strength.

2. Efficiency vs thickness

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

3. Heat tolerance

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (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 Pc (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 Pc 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: 030395-2026
Magnet Unit Converter
Force (pull)
Field Strength
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The ring-shaped magnet MP 12x8/4x3 / 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 is a crucial issue when working with model MP 12x8/4x3 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. The flat screw head should evenly press the magnet. 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 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.
The inner hole diameter determines the maximum size of the mounting element. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. 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 mounting hole diameter is precisely 8/4 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. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros as well as cons of neodymium magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They retain full power for around 10 years – the loss is just ~1% (in theory),
  • Neodymium magnets are characterized by extremely resistant to magnetic field loss caused by external interference,
  • Thanks to the glossy finish, the surface of Ni-Cu-Ni, gold, or silver-plated gives an modern appearance,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • In view of the ability of free shaping and customization to custom projects, NdFeB magnets can be manufactured in a variety of shapes and sizes, which expands the range of possible applications,
  • Universal use in future technologies – they are commonly used in magnetic memories, drive modules, precision medical tools, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in small systems

Cons

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. 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 force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Limited ability of producing threads in the magnet and complicated shapes - recommended is a housing - magnetic holder.
  • Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. Additionally, tiny parts of these devices 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 force parameter is a measurement result performed under specific, ideal conditions:
  • on a base made of structural steel, perfectly concentrating the magnetic field
  • with a thickness no less than 10 mm
  • characterized by even structure
  • under conditions of ideal adhesion (metal-to-metal)
  • for force acting at a right angle (in the magnet axis)
  • at temperature room level

What influences lifting capacity in practice

Bear in mind that the working load may be lower subject to the following factors, starting with the most relevant:
  • Clearance – existence of any layer (paint, tape, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. Alloy additives worsen the attraction effect.
  • Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal factor – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Machining danger

Dust generated during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Permanent damage

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its properties and strength.

Physical harm

Pinching hazard: The pulling power is so immense that it can cause blood blisters, crushing, and broken bones. Protective gloves are recommended.

Safe distance

Equipment safety: Strong magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, timepieces).

Caution required

Exercise caution. Neodymium magnets act from a long distance and connect with huge force, often faster than you can move away.

Allergy Warning

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, cease handling magnets and wear gloves.

Fragile material

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Impact on smartphones

Navigation devices and mobile phones are extremely sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Adults only

Product intended for adults. Tiny parts pose a choking risk, causing severe trauma. Store out of reach of kids and pets.

Pacemakers

Individuals with a ICD should maintain an large gap from magnets. The magnetism can disrupt the operation of the implant.

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