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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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Technical data - 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

Engineering simulation of the assembly - technical parameters

Presented information are the outcome of a mathematical analysis. Results rely on models for the class Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - power drop
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
 safe
2 mm 1786 Gs
178.6 mT
 1.20 kg / 2.65 lbs
1200.5 g / 11.8 N
 safe
3 mm 1437 Gs
143.7 mT
 0.78 kg / 1.71 lbs
777.8 g / 7.6 N
 safe
5 mm 885 Gs
88.5 mT
 0.29 kg / 0.65 lbs
294.7 g / 2.9 N
 safe
10 mm 277 Gs
27.7 mT
 0.03 kg / 0.06 lbs
28.9 g / 0.3 N
 safe
15 mm 110 Gs
11.0 mT
 0.00 kg / 0.01 lbs
4.6 g / 0.0 N
 safe
20 mm 53 Gs
5.3 mT
 0.00 kg / 0.00 lbs
1.1 g / 0.0 N
 safe
30 mm 18 Gs
1.8 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 safe
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 safe
Pulling power decreases significantly with every mm of gap. Keep in mind that every additional insulation layer (e.g., dirt, paint, dust) significantly weakens the grip. Magnets work optimally in perfect adhesion; air break nullifies the force. Observe how flashily the load capacity plummet, when the magnet does not adhere tightly to the metal substrate. When calculating the arrangement, eliminate additional spacers.

Table 2: Slippage load (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
This section presents the theoretical shear load sufficient to initiate the sliding of the magnet down against a upright steel plate (considering typical friction). This parameter varies with the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 hanging a element on a upright plane (e.g., a car body), it will maintain barely approx. 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip cause that holders slide down easier than they detach. Planning a hanger? Consider that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the holder will slip down under a significantly smaller load. Application of an anti-slip pad can drastically improve the result.

Table 4: Material efficiency (substrate influence) - 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 too thin steel is unable to conduct the full magnetic flux, which wastes potential of the holder. If you install a neodymium to a too thin substrate, the field will pass right through and the holding will be smaller. To squeeze full efficiency of this neodymium's potential, you require a sufficiently solid backing of steel. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the magnet works worse. We advise picking the steel cross-section based on the following data.

Table 5: Thermal resistance (stability) - thermal limit
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
Classic neodymiums lose strength above the temperature limit. Protect against heat – high temperature can permanently destroy this product. With increasing heat, the neodymium's force briefly decreases. Avoid using this magnet near heat sources exceeding its safe range. Ignoring the limit will cause permanent loss of magnetism.
*Engineering note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Thin magnets (pancake types) may lose charge permanently sooner than taller cylinders. The danger warning in the table points to permanent field degradation for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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 magnetic products interact from a wider radius than a magnet and sheet setup. The connection of two magnets generates a stronger field and a wider radius of operation. Designing a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Remember that when bringing together two magnets, the pinch force is extreme. The repulsion force is a bit weaker than the attraction, but still significant.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Attention: Figures demonstrate friction force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - 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 is a real danger to electronic devices as well as pacemakers. These NdFeB products produce a field that prevents correct functioning of digital equipment. Notice: the invisible magnetic field acts through matter and glass. Special caution must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, car keys, membranes, and displays. 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) 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
NdFeB products are very brittle – a strong collision with metal causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Striking energy can cause material chips or injury to fingers. Hold the magnet firmly 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 playing 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical 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 pole surface. Key data in coil applications as well as sensors. The Pc coefficient determines 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%
Corrosion 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. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains merely ~20% of its perpendicular strength.

2. Steel thickness impact

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

3. Power loss vs temp

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

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

chart generated for the permeance coefficient 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
Elemental analysis
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%
Ecology and recycling (GPSR)
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
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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 door latch, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 12x8/4x3 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. One turn too many can destroy the magnet, so do it slowly. 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. Damage to the protective layer during assembly is the most common cause of rusting. If you must use it outside, paint it with anti-corrosion paint after mounting.
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.
The presented product is a ring magnet with dimensions Ø12 mm (outer diameter) and height 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

Apart from their strong holding force, neodymium magnets have these key benefits:
  • They have constant strength, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
  • Neodymium magnets are distinguished by highly resistant to magnetic field loss caused by external field sources,
  • A magnet with a smooth gold surface looks better,
  • Magnetic induction on the top side of the magnet is maximum,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to freedom in constructing and the ability to adapt to specific needs,
  • Versatile presence in future technologies – they find application in mass storage devices, electric motors, precision medical tools, also industrial machines.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Limited ability of creating threads in the magnet and complicated forms - recommended is a housing - magnetic holder.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these magnets can be problematic in diagnostics medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Best holding force of the magnet in ideal parameters – what it depends on?

The declared magnet strength represents the peak performance, recorded under optimal environment, specifically:
  • on a base made of mild steel, optimally conducting the magnetic flux
  • with a thickness no less than 10 mm
  • with an ideally smooth touching surface
  • with total lack of distance (no impurities)
  • under vertical application of breakaway force (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Bear in mind that the application force will differ influenced by elements below, starting with the most relevant:
  • Space between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Plate texture – ground elements ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
  • Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was measured using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets
Fire risk

Dust generated during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Pinching danger

Large magnets can crush fingers instantly. Do not put your hand betwixt two strong magnets.

Powerful field

Before use, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

This is not a toy

These products are not intended for children. Swallowing a few magnets may result in them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates immediate surgery.

GPS and phone interference

Be aware: rare earth magnets generate a field that disrupts precision electronics. Maintain a separation from your mobile, device, and navigation systems.

Magnet fragility

Watch out for shards. Magnets can explode upon violent connection, launching shards into the air. We recommend safety glasses.

Thermal limits

Do not overheat. Neodymium magnets are susceptible to heat. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Medical implants

Warning for patients: Strong magnetic fields affect medical devices. Keep at least 30 cm distance or request help to handle the magnets.

Allergy Warning

Certain individuals experience a contact allergy to nickel, which is the standard coating for NdFeB magnets. Extended handling might lead to dermatitis. We recommend use safety gloves.

Data carriers

Do not bring magnets close to a purse, computer, or screen. The magnetism can permanently damage these devices and wipe information from cards.

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