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MP 12x8/4x3 / N38 - ring magnet

ring magnet

Catalog no 030395

GTIN/EAN: 5906301812326

5.00
Load capacity 2.21 kg / 21.72 N Magnetic Induction 277.09 mT / 2771 Gs
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
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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Lifting power as well as form of a neodymium magnet can be reviewed using our our magnetic calculator.

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Technical parameters - 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 modeling of the magnet - report

These values constitute the direct effect of a engineering calculation. Values rely on models for the material Nd2Fe14B. Operational conditions might slightly differ. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull 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
 strong
1 mm 2138 Gs
213.8 mT
 1.72 kg / 3.79 LBS
1720.7 g / 16.9 N
 low risk
2 mm 1786 Gs
178.6 mT
 1.20 kg / 2.65 LBS
1200.5 g / 11.8 N
 low risk
3 mm 1437 Gs
143.7 mT
 0.78 kg / 1.71 LBS
777.8 g / 7.6 N
 low risk
5 mm 885 Gs
88.5 mT
 0.29 kg / 0.65 LBS
294.7 g / 2.9 N
 low risk
10 mm 277 Gs
27.7 mT
 0.03 kg / 0.06 LBS
28.9 g / 0.3 N
 low risk
15 mm 110 Gs
11.0 mT
 0.00 kg / 0.01 LBS
4.6 g / 0.0 N
 low risk
20 mm 53 Gs
5.3 mT
 0.00 kg / 0.00 LBS
1.1 g / 0.0 N
 low risk
30 mm 18 Gs
1.8 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 low risk
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
Magnetic force decreases drastically with every subsequent millimeter of gap. Note that even a microscopic distance (e.g., dirt, paint, dust) strongly weakens the grip. Neodymiums work optimally at the point of direct contact; gap drastically cuts the force. See how rapidly the load capacity drop, when the magnet does not touch directly to the steel surface. When calculating the arrangement, eliminate redundant distances.

Table 2: Vertical capacity (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 calculates the estimated force necessary to initiate the slippage of the magnet downwards against a upright steel plate (assuming standard friction). The holding force is relative to the air gap 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 hanging a magnet on a vertical plane (e.g., a board), it you can count on just approx. 20%-30% of its nominal power. Gravity as well as a weak degree of grip mean that magnets slide down easier than they pop off the substrate. Want to create a vertical fastening? Note that the shear force is much weaker than the maximum static pull force. On a smooth steel, the holder will slide down under a significantly smaller load. Using a rubber layer can significantly increase the grip.

Table 4: Steel thickness (saturation) - 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 sheet is unable to absorb the full magnetic flux, which squanders power of the holder. If you attach a powerful product to a thin surface, the field will penetrate right through and the holding will be smaller. To utilize 100% of this magnet's potential, you require a sufficiently solid piece of steel. The saturation effect means that on delicate walls (e.g., appliance housings), the product works worse. We suggest choosing the steel thickness according to the table below.

Table 5: Working in heat (stability) - 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
Standard neodymium magnets irreversibly lose power above the temperature limit. Avoid high temperatures – high temperature can irreversibly damage this product. With increasing heat, the neodymium's force momentarily lowers. Do not use this magnet near heat sources exceeding its safe range. Exceeding the critical threshold will result in permanent loss of magnetism.
*Technical advisory: Temperature resistance is determined by both grade, but also on the magnet's shape. Low-profile magnets (pancake types) are more susceptible to demagnetization at lower temperatures compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
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 magnets attract each other from a significantly greater distance than a neodymium and metal setup. The setup of magnet-to-magnet generates a stronger field and a larger range of action. Designing a solid fastener? Utilize two neodymiums instead of a neodymium and a steel. Remember that when connecting a pair of magnets, the impact force is extreme. The levitation is marginally weaker than the connection force, but still impressive.
*Flux density for N-N configuration is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).
Note: Figures apply to sliding force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

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
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Mobile device 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
Powerful magnet radiation is a real danger to electronic devices and pacemakers. These neodymiums generate a flux that destroys function of sensitive medical devices. Be aware: the unseen radiation penetrates the body and plastic. Exceptional care must be exercised by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MP 12x8/4x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.91 km/h
(7.20 m/s)
 0.06 J
30 mm 26.09 km/h
(7.25 m/s)
 0.06 J
50 mm 26.09 km/h
(7.25 m/s)
 0.06 J
100 mm 26.09 km/h
(7.25 m/s)
 0.06 J
Neodymium magnets are prone to chipping – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy can cause material chips or injury to skin. Hold the magnet firmly during mounting so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear eye protection when working with large magnets.

Table 9: Surface protection spec
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)
Neodymium magnets are highly susceptible to corrosion without proper protection. 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)
Total magnetic flux passing through the magnet pole. Key data in coil applications as well as sensors. Pc value defines the magnet's operating point.

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%
Rust risk: 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

*Note: On a vertical wall, the magnet holds merely a fraction of its nominal pull.

2. Efficiency vs thickness

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

3. Temperature resistance

*For standard magnets, the max working temp 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.

Engineering data and GPSR

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%

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 quick installation to wood, wall, plastic, or metal. 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. 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 can be damaged when tightening the screw, which will become a corrosion focus. This product is dedicated for inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 8/4 mm fits this model. 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. 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.
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 mounting hole diameter is precisely 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. In the case of connecting two rings, make sure one is turned the right way. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Strengths and weaknesses of neodymium magnets.

Pros

Besides their remarkable pulling force, neodymium magnets offer the following advantages:
  • They have constant strength, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They are resistant to demagnetization induced by external disturbances,
  • By using a smooth coating of gold, the element presents an elegant look,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to modularity in forming and the ability to adapt to unusual requirements,
  • Fundamental importance in innovative solutions – they are utilized in computer drives, drive modules, medical equipment, also other advanced devices.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Limited possibility of producing threads in the magnet and complicated shapes - preferred is casing - magnet mounting.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these magnets can complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

The load parameter shown concerns the limit force, obtained under ideal test conditions, meaning:
  • using a base made of high-permeability steel, functioning as a magnetic yoke
  • whose thickness reaches at least 10 mm
  • characterized by even structure
  • with direct contact (no paint)
  • during pulling in a direction vertical to the plane
  • at ambient temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

It is worth knowing that the working load will differ influenced by elements below, in order of importance:
  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick plate does not close the flux, causing part of the power to be wasted into the air.
  • Plate material – low-carbon steel attracts best. Alloy admixtures lower magnetic properties and holding force.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was determined using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, however under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet and the plate decreases the holding force.

Warnings
Caution required

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Allergy Warning

Some people suffer from a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Frequent touching might lead to dermatitis. It is best to use protective gloves.

This is not a toy

NdFeB magnets are not suitable for play. Swallowing multiple magnets can lead to them attracting across intestines, which poses a severe health hazard and requires urgent medical intervention.

Crushing force

Large magnets can break fingers in a fraction of a second. Never place your hand betwixt two strong magnets.

Fire warning

Fire warning: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.

Medical implants

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

GPS Danger

A strong magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Maintain magnets near a smartphone to avoid breaking the sensors.

Operating temperature

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its properties and strength.

Material brittleness

Beware of splinters. Magnets can explode upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.

Keep away from computers

Equipment safety: Neodymium magnets can damage payment cards and sensitive devices (heart implants, hearing aids, mechanical watches).

Attention! Need more info? Check our post: Why are neodymium magnets dangerous?