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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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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Physical properties - 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

Technical analysis of the product - report

These data represent the result of a mathematical simulation. Results were calculated on models for the class Nd2Fe14B. Actual conditions may differ. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static force (force vs gap) - 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
 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 weakens significantly with every subsequent millimeter of gap. Remember that every additional insulation layer (e.g., contamination, varnish, veneer) significantly diminishes the holding power. Magnets hold most effectively at the point of direct contact; distance weakens the power. Analyze how quickly the load capacity fall, when the product does not touch directly to the steel surface. When designing the mounting, avoid unnecessary gaps.

Table 2: Vertical hold (vertical surface)
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 shows the estimated holding capacity necessary to cause the slippage of the magnet vertically against a vertical steel plate (assuming typical friction). This parameter is relative to the distance between the magnet and the surface.

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 placing a holder on a upright plane (e.g., a fridge), it will maintain barely approx. 20%-30% of its nominal power. Gravitational force as well as a weak degree of grip cause that magnets move down faster than they pull off. Designing a vertical fastening? Remember that the sliding force is significantly lower than the maximum static pull force. On a painted metal, the magnet will give way down under a much lighter weight. Application of an anti-slip layer can drastically raise the stability.

Table 4: Steel thickness (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 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 metal plate is unable to conduct the entire magnetic field, which squanders power of the holder. Should you attach a powerful product to a too thin substrate, the field will penetrate right through and the holding will be smaller. To utilize full efficiency of this magnet's power, you need a suitably thick piece of metal. The saturation phenomenon means that on delicate walls (e.g., thin profiles), the product holds weaker. We advise picking the steel dimension from these parameters.

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 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. Protect against heat – high temperature can permanently demagnetize this magnet. With every degree above norm, the neodymium's force temporarily lowers. Do not use this product near heat sources exceeding its operating temperature limit. Exceeding the critical threshold will lead to permanent loss of magnetism.
*Technical advisory: Temperature resistance is determined by both grade, but also on the magnet's shape. Low-profile magnets (low Pc) may lose charge permanently at lower temperatures than taller cylinders. The danger warning in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
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 attract each other from a wider radius than a magnet and steel combination. The connection of two magnets creates a more powerful interaction and a further horizon of action. Designing a powerful holder? Use a pair of magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is extreme. The levitation is slightly lower than the attraction, but still large.
*Flux density in repulsion mode is approximately ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Note: Calculations refer to friction force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - precautionary measures
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
Extremely neodym field is a real danger to electronics and medical implants. These magnets generate a field that destroys function of sensitive medical devices. Remember: the invisible magnetic field acts through matter and housings. Exceptional care must be exercised by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, membranes, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (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 delicate – a violent impact against metal causes immediate chipping. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or injury to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when handling 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
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 as well as sensors. Pc value 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.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Vertical hold

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

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) significantly weakens 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

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 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 specification and ecology
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. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. This product with a force of 2.21 kg works great as a door latch, 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.
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. 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 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.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Strengths

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They have stable power, and over around ten years their attraction force decreases symbolically – ~1% (according to theory),
  • They are resistant to demagnetization induced by external field influence,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Neodymium magnets create maximum magnetic induction on a contact point, which allows for strong attraction,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of accurate forming and optimizing to precise applications,
  • Versatile presence in high-tech industry – they serve a role in mass storage devices, electromotive mechanisms, diagnostic systems, and complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in miniature devices

Weaknesses

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited ability of producing threads in the magnet and complicated forms - preferred is cover - mounting mechanism.
  • Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Additionally, small elements of these magnets can complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

The force parameter is a result of laboratory testing performed under the following configuration:
  • using a plate made of mild steel, serving as a ideal flux conductor
  • with a cross-section minimum 10 mm
  • with a plane free of scratches
  • with direct contact (without paint)
  • under axial force direction (90-degree angle)
  • in stable room temperature

Determinants of lifting force in real conditions

Effective lifting capacity is influenced by specific conditions, mainly (from most important):
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) 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 significantly lower power (often approx. 20-30% of nominal force).
  • Plate thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be escaped into the air.
  • Metal type – not every steel reacts the same. High carbon content worsen the attraction effect.
  • Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
GPS Danger

Be aware: rare earth magnets produce a field that confuses precision electronics. Maintain a safe distance from your phone, tablet, and GPS.

Do not underestimate power

Handle with care. Neodymium magnets attract from a long distance and snap with huge force, often quicker than you can move away.

Pinching danger

Mind your fingers. Two powerful magnets will join immediately with a force of several hundred kilograms, destroying anything in their path. Be careful!

Life threat

For implant holders: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Danger to the youngest

Strictly store magnets away from children. Ingestion danger is high, and the consequences of magnets clamping inside the body are fatal.

Protect data

Avoid bringing magnets close to a purse, laptop, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Mechanical processing

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

Maximum temperature

Keep cool. Neodymium magnets are sensitive to heat. If you need operation above 80°C, look for HT versions (H, SH, UH).

Allergic reactions

Certain individuals suffer from a hypersensitivity to Ni, which is the typical protective layer for neodymium magnets. Frequent touching might lead to dermatitis. We suggest use protective gloves.

Protective goggles

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Caution! Want to know more? Read our article: Why are neodymium magnets dangerous?