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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 parameters »

1.427 ZŁ with VAT / pcs + price for transport

1.160 ZŁ net + 23% VAT / pcs

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Technical parameters 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 simulation of the product - report

These data constitute the result of a physical simulation. Results are based on algorithms for the material Nd2Fe14B. Operational performance may differ from theoretical values. Use these data as a supplementary guide when designing systems.

Table 1: Static pull force (force vs distance) - 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 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
Grip strength drops drastically per each millimeter of spacing. Keep in mind that even the smallest gap (e.g., contamination, paint, dust) significantly weakens the grip. Magnetic products work optimally during direct contact; distance kills the power. Notice how flashily the load capacity fall, when the magnet does not adhere tightly to the steel surface. When calculating the arrangement, avoid additional spacers.

Table 2: Slippage capacity (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 defines the estimated holding capacity sufficient to cause the sliding of the magnet down along a vertical steel wall (considering typical friction coefficient). The holding force is relative to the air gap between the magnet and the surface.

Table 3: Wall mounting (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 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 surface (e.g., a board), it will maintain barely approx. 1/5 of its nominal power. Gravity as well as a low friction coefficient influence the fact that products slide down faster than they pop off the substrate. Want to create a hanger? Remember that the sliding force is noticeably lower than the maximum static pull force. On a slippery surface, the magnet will give way down under a much lighter load. Application of an anti-slip layer can effectively improve the result.

Table 4: Material efficiency (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 too thin steel is unable to take in the full magnetic flux, which squanders power of the holder. If you attach a powerful product to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To achieve 100% of this magnet's power, you need a suitably thick element of metal. The saturation effect means that on delicate walls (e.g., appliance housings), the magnet holds weaker. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal resistance (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
Ordinary NdFeB products change their properties power above the temperature limit. Watch out for overheating – heat can permanently damage this magnet. With every degree above norm, the magnet's force temporarily decreases. Refrain from using this product close to ovens higher than its safe range. Too high temperature will result in irreversible degradation of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) are more susceptible to demagnetization sooner compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
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 strong neodymiums attract each other from a wider radius than a magnet and sheet setup. Such a system of two magnets creates a more powerful interaction and a further horizon of action. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the impact force is extreme. The repulsion force is a bit weaker than the connection force, but still significant.
*Field value in repulsion mode drops to ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Important: Figures apply to friction force of two matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (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
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
Extremely neodym field is a real danger to electronic devices as well as pacemakers. These magnets produce a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation penetrates the body and glass. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, car keys, membranes, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (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
NdFeB products are prone to chipping – a violent impact against metal causes immediate chipping. Control the attraction moment – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or injury to fingers. Be sure to control the product during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear safety glasses when working with large magnets.

Table 9: Anti-corrosion coating durability
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. Improper coating selection is the most common cause of magnet failure over time.

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 emitted by the magnet pole. Key data for generator designers and motors. Pc value defines the magnet's operating point.

Table 11: Submerged application
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) drastically 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

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 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%
Sustainability
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 permanent mounting, 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 cabinet closure, speaker holder, or spacer element in devices.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. 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.
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. Aesthetic mounting requires selecting the appropriate head size.
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.
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 rare earth magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their magnetic field is maintained, and after around 10 years it drops only by ~1% (theoretically),
  • Magnets effectively protect themselves against demagnetization caused by ambient magnetic noise,
  • By using a decorative layer of nickel, the element has an elegant look,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • 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 possibility of accurate forming and adaptation to individualized projects, neodymium magnets can be manufactured in a variety of geometric configurations, which increases their versatility,
  • Universal use in electronics industry – they are used in mass storage devices, electromotive mechanisms, diagnostic systems, and multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Cons of neodymium magnets: tips and applications.
  • At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose 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
  • They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating nuts in the magnet and complex forms - recommended is cover - magnetic holder.
  • Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small components of these products are able to be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Highest magnetic holding force – what it depends on?

Magnet power is the result of a measurement for ideal contact conditions, taking into account:
  • on a base made of structural steel, effectively closing the magnetic flux
  • whose transverse dimension reaches at least 10 mm
  • characterized by smoothness
  • under conditions of ideal adhesion (surface-to-surface)
  • for force applied at a right angle (pull-off, not shear)
  • at standard ambient temperature

Key elements affecting lifting force

In real-world applications, the actual holding force depends on many variables, presented from crucial:
  • Distance (between the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Steel thickness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be lost to the other side.
  • Plate material – low-carbon steel gives the best results. Alloy admixtures reduce magnetic permeability and holding force.
  • Base smoothness – the more even the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the holding force is lower. Moreover, even a small distance between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets
Skin irritation risks

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness appears, cease working with magnets and use protective gear.

This is not a toy

Neodymium magnets are not suitable for play. Accidental ingestion of multiple magnets may result in them attracting across intestines, which constitutes a severe health hazard and necessitates immediate surgery.

Powerful field

Exercise caution. Rare earth magnets act from a distance and connect with huge force, often faster than you can react.

Bone fractures

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Heat sensitivity

Watch the temperature. Heating the magnet to high heat will permanently weaken its magnetic structure and strength.

Magnets are brittle

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Life threat

Individuals with a pacemaker have to keep an safe separation from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Mechanical processing

Dust produced during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

GPS Danger

Navigation devices and smartphones are highly sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Electronic devices

Avoid bringing magnets near a wallet, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.

Safety First! More info about hazards in the article: Magnet Safety Guide.