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MP 12x5x2 / N38 - ring magnet

ring magnet

Catalog no 030498

Diameter

12 mm [±0,1 mm]

internal diameter Ø

5 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

1.4 g

Magnetization Direction

↑ axial

Load capacity

1.15 kg / 11.29 N

Magnetic Induction

195.97 mT / 1960 Gs

Coating

[NiCuNi] Nickel

see technical data »

1.230 ZŁ with VAT / pcs + price for transport

1.000 ZŁ net + 23% VAT / pcs

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Technical of the product - MP 12x5x2 / N38 - ring magnet

Specification / characteristics - MP 12x5x2 / N38 - ring magnet

properties
properties values
Cat. no. 030498
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 5 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 1.4 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.15 kg / 11.29 N
Magnetic Induction ~ ? 195.97 mT / 1960 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 12x5x2 / 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 analysis of the magnet - report

The following values constitute the direct effect of a engineering calculation. Values are based on algorithms for the material Nd2Fe14B. Real-world conditions may deviate from the simulation results. Treat these calculations as a supplementary guide for designers.

Table 1: Static pull force (pull vs distance) - power drop
MP 12x5x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6085 Gs
608.5 mT
 1.15 kg / 2.54 pounds
1150.0 g / 11.3 N
 low risk
1 mm 5082 Gs
508.2 mT
 0.80 kg / 1.77 pounds
802.2 g / 7.9 N
 low risk
2 mm 4147 Gs
414.7 mT
 0.53 kg / 1.18 pounds
534.0 g / 5.2 N
 low risk
3 mm 3340 Gs
334.0 mT
 0.35 kg / 0.76 pounds
346.3 g / 3.4 N
 low risk
5 mm 2152 Gs
215.2 mT
 0.14 kg / 0.32 pounds
143.8 g / 1.4 N
 low risk
10 mm 822 Gs
82.2 mT
 0.02 kg / 0.05 pounds
21.0 g / 0.2 N
 low risk
15 mm 394 Gs
39.4 mT
 0.00 kg / 0.01 pounds
4.8 g / 0.0 N
 low risk
20 mm 221 Gs
22.1 mT
 0.00 kg / 0.00 pounds
1.5 g / 0.0 N
 low risk
30 mm 92 Gs
9.2 mT
 0.00 kg / 0.00 pounds
0.3 g / 0.0 N
 low risk
50 mm 28 Gs
2.8 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Grip strength decreases sharply per each millimeter of distance. Note that even the smallest gap (e.g., contamination, paint, rust) strongly weakens the grip. Magnetic products hold strongest during direct contact; distance kills the power. Observe how flashily the pull force plummet, when the product does not adhere tightly to the metal substrate. When planning the arrangement, discard unnecessary gaps.

Table 2: Vertical load (vertical surface)
MP 12x5x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.23 kg / 0.51 pounds
230.0 g / 2.3 N
1 mm Stal (~0.2) 0.16 kg / 0.35 pounds
160.0 g / 1.6 N
2 mm Stal (~0.2) 0.11 kg / 0.23 pounds
106.0 g / 1.0 N
3 mm Stal (~0.2) 0.07 kg / 0.15 pounds
70.0 g / 0.7 N
5 mm Stal (~0.2) 0.03 kg / 0.06 pounds
28.0 g / 0.3 N
10 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 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 table below indicates the estimated weight limit required to cause the shifting of the magnet down against a vertical steel plate (assuming typical friction coefficient). The holding force varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MP 12x5x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.35 kg / 0.76 pounds
345.0 g / 3.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.23 kg / 0.51 pounds
230.0 g / 2.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.11 kg / 0.25 pounds
115.0 g / 1.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.58 kg / 1.27 pounds
575.0 g / 5.6 N
When hanging a element on a upright wall (e.g., a fridge), it will maintain just approx. 1/5 of its nominal power. Gravitational force and a low friction coefficient mean that holders move down easier than they detach. Want to create a vertical fastening? Consider that the shear force is noticeably lower than the maximum static pull force. On a painted metal, the element will give way down under a much lighter cargo. Using a rubber coating can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 12x5x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.11 kg / 0.25 pounds
115.0 g / 1.1 N
1 mm
25%
 0.29 kg / 0.63 pounds
287.5 g / 2.8 N
2 mm
50%
 0.58 kg / 1.27 pounds
575.0 g / 5.6 N
3 mm
75%
 0.86 kg / 1.90 pounds
862.5 g / 8.5 N
5 mm
100%
 1.15 kg / 2.54 pounds
1150.0 g / 11.3 N
10 mm
100%
 1.15 kg / 2.54 pounds
1150.0 g / 11.3 N
11 mm
100%
 1.15 kg / 2.54 pounds
1150.0 g / 11.3 N
12 mm
100%
 1.15 kg / 2.54 pounds
1150.0 g / 11.3 N
A thin metal plate cannot conduct the entire magnetic field, which squanders power of the magnet. Should you install a neodymium to a thin surface, the magnetism will pass right through and the pull force will drop sharply. To utilize 100% of this neodymium's power, you require a sufficiently solid piece of metal. The material oversaturation means that on delicate walls (e.g., thin profiles), the product shows lower pull force. We suggest choosing the steel cross-section according to the table below.

Table 5: Working in heat (material behavior) - resistance threshold
MP 12x5x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.15 kg / 2.54 pounds
1150.0 g / 11.3 N
 OK
40 °C -2.2% 1.12 kg / 2.48 pounds
1124.7 g / 11.0 N
 OK
60 °C -4.4% 1.10 kg / 2.42 pounds
1099.4 g / 10.8 N
 OK
80 °C -6.6% 1.07 kg / 2.37 pounds
1074.1 g / 10.5 N
100 °C -28.8% 0.82 kg / 1.81 pounds
818.8 g / 8.0 N
Classic neodymiums change their properties parameters above the temperature limit. Protect against heat – heat can irreversibly damage this product. As the temperature rises, the magnet's force briefly decreases. Avoid using this magnet in hot environments higher than its operating temperature limit. Too high temperature will cause destruction of magnetism.
*Engineering note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) may lose charge permanently at lower temperatures than taller cylinders. Warning indicator in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 12x5x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 21.34 kg / 47.04 pounds
6 163 Gs
3.20 kg / 7.06 pounds
3201 g / 31.4 N
 N/A
1 mm 17.97 kg / 39.61 pounds
11 168 Gs
2.69 kg / 5.94 pounds
2695 g / 26.4 N
 16.17 kg / 35.65 pounds
~0 Gs
2 mm 14.88 kg / 32.81 pounds
10 165 Gs
2.23 kg / 4.92 pounds
2233 g / 21.9 N
 13.40 kg / 29.53 pounds
~0 Gs
3 mm 12.20 kg / 26.89 pounds
9 202 Gs
1.83 kg / 4.03 pounds
1830 g / 17.9 N
 10.98 kg / 24.20 pounds
~0 Gs
5 mm 8.00 kg / 17.63 pounds
7 450 Gs
1.20 kg / 2.64 pounds
1199 g / 11.8 N
 7.20 kg / 15.87 pounds
~0 Gs
10 mm 2.67 kg / 5.88 pounds
4 304 Gs
0.40 kg / 0.88 pounds
400 g / 3.9 N
 2.40 kg / 5.30 pounds
~0 Gs
20 mm 0.39 kg / 0.86 pounds
1 644 Gs
0.06 kg / 0.13 pounds
58 g / 0.6 N
 0.35 kg / 0.77 pounds
~0 Gs
50 mm 0.01 kg / 0.02 pounds
275 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
60 mm 0.00 kg / 0.01 pounds
184 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.01 pounds
129 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
95 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
72 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
56 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets attract each other from a wider radius than a neodymium and metal combination. The connection of magnet-to-magnet generates a stronger field and a further horizon of performance. Planning to create a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the collision energy is huge. The repulsion force is marginally weaker than the connection force, but still large.
*The magnetic induction in repulsion mode reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Important: Estimates refer to sliding force of dual matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - precautionary measures
MP 12x5x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.0 cm
Hearing aid 10 Gs (1.0 mT) 8.0 cm
Mechanical watch 20 Gs (2.0 mT) 6.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.5 cm
Remote 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field poses a serious hazard to electronic devices and medical implants. These neodymiums generate a flux that destroys function of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and housings. Increased vigilance must be exercised by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, membranes, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MP 12x5x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 29.23 km/h
(8.12 m/s)
 0.05 J
30 mm 50.07 km/h
(13.91 m/s)
 0.14 J
50 mm 64.63 km/h
(17.95 m/s)
 0.23 J
100 mm 91.40 km/h
(25.39 m/s)
 0.45 J
Neodymium magnets are prone to chipping – a collision with steel risks their cracking. Control the attraction moment – a neodymium left loose speeds with massive force. Impact energy can destroy the magnet or painful pinches to fingers. Hold the magnet firmly during installation so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Coating parameters (durability)
MP 12x5x2 / 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: Electrical data (Flux)
MP 12x5x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 503 Mx 65.0 µWb
Pc Coefficient 1.34 High (Stable)
Flux value passing through the pole surface. Essential parameter for generator designers and motors. Pc value determines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 12x5x2 / N38

Environment Effective steel pull Effect
Air (land) 1.15 kg Standard
Water (riverbed) 1.32 kg
(+0.17 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. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Note: On a vertical surface, the magnet holds only ~20% of its nominal pull.

2. Plate thickness effect

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

3. Heat tolerance

*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) = 1.34

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%
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: 030498-2026
Magnet Unit Converter
Force (pull)
Field Strength
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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. 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 1.15 kg works great as a cabinet closure, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 12x5x2 / 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. 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.
A screw or bolt with a thread diameter smaller than 5 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.
The presented product is a ring magnet with dimensions Ø12 mm (outer diameter) and height 2 mm. The key parameter here is the lifting capacity amounting to approximately 1.15 kg (force ~11.29 N). The mounting hole diameter is precisely 5 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.

Advantages and disadvantages of rare earth magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over around ten years their performance decreases symbolically – ~1% (according to theory),
  • They are resistant to demagnetization induced by presence of other magnetic fields,
  • The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnetic induction on the working layer of the magnet turns out to be exceptional,
  • 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...
  • Possibility of individual forming and optimizing to complex needs,
  • Universal use in modern technologies – they find application in computer drives, motor assemblies, medical equipment, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in small systems

Limitations

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and 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
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these products can complicate diagnosis medical in case of swallowing.
  • With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

The declared magnet strength represents the maximum value, measured under optimal environment, namely:
  • with the use of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • with a thickness of at least 10 mm
  • with an polished contact surface
  • without the slightest clearance between the magnet and steel
  • under vertical force direction (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Holding efficiency impacted by specific conditions, mainly (from priority):
  • Gap between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Steel type – mild steel gives the best results. Higher carbon content decrease magnetic permeability and lifting capacity.
  • Base smoothness – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Thermal environment – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance between the magnet and the plate lowers the load capacity.

Safe handling of neodymium magnets
Eye protection

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Adults only

Neodymium magnets are not toys. Eating a few magnets may result in them pinching intestinal walls, which poses a critical condition and requires urgent medical intervention.

Allergic reactions

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation happens, immediately stop working with magnets and use protective gear.

Serious injuries

Pinching hazard: The attraction force is so immense that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.

Heat warning

Standard neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

Data carriers

Do not bring magnets close to a purse, computer, or TV. The magnetic field can destroy these devices and wipe information from cards.

Handling guide

Be careful. Rare earth magnets act from a long distance and connect with massive power, often faster than you can react.

Fire risk

Fire hazard: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.

Keep away from electronics

A powerful magnetic field interferes with the functioning of compasses in phones and navigation systems. Do not bring magnets close to a device to avoid breaking the sensors.

Health Danger

Patients with a heart stimulator must keep an large gap from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Security! Want to know more? Check our post: Are neodymium magnets dangerous?