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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

technical specifications »

1.427 ZŁ with VAT / pcs + price for transport

1.160 ZŁ net + 23% VAT / pcs

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Contact us by phone +48 888 99 98 98 otherwise get in touch by means of contact form the contact page.
Specifications along with form of a neodymium magnet can be tested using our magnetic mass calculator.

Orders placed before 14:00 will be shipped the same business day.

Technical specification 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

Engineering modeling of the assembly - technical parameters

The following information represent the direct effect of a mathematical calculation. Results were calculated on models for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Use these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
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 pounds
2210.0 g / 21.7 N
 warning
1 mm 2138 Gs
213.8 mT
 1.72 kg / 3.79 pounds
1720.7 g / 16.9 N
 safe
2 mm 1786 Gs
178.6 mT
 1.20 kg / 2.65 pounds
1200.5 g / 11.8 N
 safe
3 mm 1437 Gs
143.7 mT
 0.78 kg / 1.71 pounds
777.8 g / 7.6 N
 safe
5 mm 885 Gs
88.5 mT
 0.29 kg / 0.65 pounds
294.7 g / 2.9 N
 safe
10 mm 277 Gs
27.7 mT
 0.03 kg / 0.06 pounds
28.9 g / 0.3 N
 safe
15 mm 110 Gs
11.0 mT
 0.00 kg / 0.01 pounds
4.6 g / 0.0 N
 safe
20 mm 53 Gs
5.3 mT
 0.00 kg / 0.00 pounds
1.1 g / 0.0 N
 safe
30 mm 18 Gs
1.8 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 safe
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
Grip strength decreases significantly per each millimeter of gap. Note that even a microscopic distance (e.g., contamination, varnish, rust) noticeably weakens the grip. Neodymiums work strongest in perfect adhesion; distance drastically cuts the force. Observe how flashily the pull force drop, when the magnet does not touch tightly to the steel surface. When designing the arrangement, eliminate unnecessary gaps.

Table 2: Sliding load (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 pounds
442.0 g / 4.3 N
1 mm Stal (~0.2) 0.34 kg / 0.76 pounds
344.0 g / 3.4 N
2 mm Stal (~0.2) 0.24 kg / 0.53 pounds
240.0 g / 2.4 N
3 mm Stal (~0.2) 0.16 kg / 0.34 pounds
156.0 g / 1.5 N
5 mm Stal (~0.2) 0.06 kg / 0.13 pounds
58.0 g / 0.6 N
10 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data calculates the estimated shear load needed to initiate the shifting of the magnet downwards along a upright steel plate (assuming typical friction). The holding force depends on the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - 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 pounds
663.0 g / 6.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.44 kg / 0.97 pounds
442.0 g / 4.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.22 kg / 0.49 pounds
221.0 g / 2.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.11 kg / 2.44 pounds
1105.0 g / 10.8 N
When placing a magnet on a vertical surface (e.g., a fridge), it you can count on only about 1/5 of its maximum pull force. Gravity and a weak degree of grip influence the fact that holders move down faster than they pull off. Want to create a vertical fastening? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the element will slide down under a noticeably lighter weight. Using a rubber layer can drastically raise the stability.

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 pounds
221.0 g / 2.2 N
1 mm
25%
 0.55 kg / 1.22 pounds
552.5 g / 5.4 N
2 mm
50%
 1.11 kg / 2.44 pounds
1105.0 g / 10.8 N
3 mm
75%
 1.66 kg / 3.65 pounds
1657.5 g / 16.3 N
5 mm
100%
 2.21 kg / 4.87 pounds
2210.0 g / 21.7 N
10 mm
100%
 2.21 kg / 4.87 pounds
2210.0 g / 21.7 N
11 mm
100%
 2.21 kg / 4.87 pounds
2210.0 g / 21.7 N
12 mm
100%
 2.21 kg / 4.87 pounds
2210.0 g / 21.7 N
A too thin steel cannot take in the full magnetic flux, which weakens actual performance of the magnet. If you install a neodymium to a too thin substrate, the magnetism will pass right through and the holding will be smaller. To achieve full efficiency of this neodymium's power, you require a sufficiently solid element of steel. The saturation effect means that on thin elements (e.g., thin profiles), the product holds weaker. We advise picking the steel dimension from these parameters.

Table 5: Working in heat (material behavior) - 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 pounds
2210.0 g / 21.7 N
 OK
40 °C -2.2% 2.16 kg / 4.77 pounds
2161.4 g / 21.2 N
 OK
60 °C -4.4% 2.11 kg / 4.66 pounds
2112.8 g / 20.7 N
80 °C -6.6% 2.06 kg / 4.55 pounds
2064.1 g / 20.2 N
100 °C -28.8% 1.57 kg / 3.47 pounds
1573.5 g / 15.4 N
Ordinary NdFeB products irreversibly lose strength above the temperature limit. Avoid high temperatures – high temperature can permanently damage this product. As the temperature rises, the magnet's force briefly lowers. Do not use this magnet close to ovens exceeding its safe range. Ignoring the limit will cause irreversible degradation of magnetism.
*Technical advisory: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) are more susceptible to demagnetization sooner than long magnets. Red status in the table points to a risk of irreversible loss for this particular item.

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 pounds
4 010 Gs
0.46 kg / 1.02 pounds
464 g / 4.6 N
 N/A
1 mm 2.77 kg / 6.12 pounds
4 589 Gs
0.42 kg / 0.92 pounds
416 g / 4.1 N
 2.50 kg / 5.50 pounds
~0 Gs
2 mm 2.41 kg / 5.31 pounds
4 276 Gs
0.36 kg / 0.80 pounds
361 g / 3.5 N
 2.17 kg / 4.78 pounds
~0 Gs
3 mm 2.03 kg / 4.48 pounds
3 930 Gs
0.31 kg / 0.67 pounds
305 g / 3.0 N
 1.83 kg / 4.04 pounds
~0 Gs
5 mm 1.36 kg / 3.00 pounds
3 216 Gs
0.20 kg / 0.45 pounds
204 g / 2.0 N
 1.23 kg / 2.70 pounds
~0 Gs
10 mm 0.41 kg / 0.91 pounds
1 770 Gs
0.06 kg / 0.14 pounds
62 g / 0.6 N
 0.37 kg / 0.82 pounds
~0 Gs
20 mm 0.04 kg / 0.09 pounds
554 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.04 kg / 0.08 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
58 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
35 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
23 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
16 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
11 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
8 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums interact from a much further distance than a magnet and sheet setup. Such a system of two magnets produces a massive flux and a larger range of action. Want to build a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is huge. The levitation is marginally weaker than the connection force, but still large.
*Field value for N-N configuration reaches ~0 Gs in the exact middle of the gap (due to field cancellation).
Note: Calculations apply to sliding force of a pair of identical magnets (friction coefficient ~0.15 for Ni-Ni coating).

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
Mechanical watch 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 large risk to electronics and pacemakers. These magnets produce a flux that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and plastic. Exceptional care must be exercised by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - 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
Magnetic elements are prone to chipping – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely turns into a projectile. 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 means shattering of the magnet. Use safety goggles when playing 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)
The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Construction 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 emitted by the pole surface. Essential parameter in coil applications and motors. Pc value determines 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%
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. Sliding resistance

*Note: On a vertical wall, the magnet retains only a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

*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%
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
Quick Unit Converter
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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 great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. It's a good idea to use a rubber spacer 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. 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. If you must use it outside, paint it with anti-corrosion paint after mounting.
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.
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 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.

Pros as well as cons of rare earth magnets.

Pros

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% (in laboratory conditions),
  • Magnets perfectly defend themselves against demagnetization caused by external fields,
  • The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to look better,
  • They are known for high magnetic induction at the operating surface, which affects their effectiveness,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to versatility in constructing and the capacity to modify to specific needs,
  • Universal use in electronics industry – they are utilized in hard drives, electromotive mechanisms, medical equipment, as well as industrial machines.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Problematic aspects of neodymium magnets: application proposals
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their force 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
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We recommend a housing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these products are able to disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Highest magnetic holding force – what it depends on?

The force parameter is a result of laboratory testing conducted under specific, ideal conditions:
  • with the contact of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • whose transverse dimension is min. 10 mm
  • with an ground contact surface
  • without any air gap between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Effective lifting capacity is affected by specific conditions, mainly (from priority):
  • Gap (betwixt the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
  • Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets
Maximum temperature

Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Immense force

Use magnets consciously. Their powerful strength can surprise even professionals. Plan your moves and do not underestimate their power.

Compass and GPS

Navigation devices and mobile phones are highly susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Fragile material

Neodymium magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets will cause them cracking into small pieces.

Sensitization to coating

It is widely known that nickel (standard magnet coating) is a potent allergen. If your skin reacts to metals, prevent direct skin contact and select versions in plastic housing.

Implant safety

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

Finger safety

Danger of trauma: The pulling power is so great that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.

No play value

Adult use only. Tiny parts can be swallowed, causing severe trauma. Store out of reach of kids and pets.

Dust is flammable

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

Keep away from computers

Equipment safety: Strong magnets can damage data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).

Attention! Details about risks in the article: Safety of working with magnets.