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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

check technical specifications »

1.230 ZŁ with VAT / pcs + price for transport

1.000 ZŁ net + 23% VAT / pcs

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Force and form of a neodymium magnet can be analyzed using our magnetic mass calculator.

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Detailed specification - 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

Technical analysis of the product - technical parameters

Presented data constitute the outcome of a mathematical simulation. Values are based on models for the class Nd2Fe14B. Actual parameters might slightly differ. Use these calculations as a supplementary guide for designers.

Table 1: Static force (force vs distance) - characteristics
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
 safe
1 mm 5082 Gs
508.2 mT
 0.80 kg / 1.77 pounds
802.2 g / 7.9 N
 safe
2 mm 4147 Gs
414.7 mT
 0.53 kg / 1.18 pounds
534.0 g / 5.2 N
 safe
3 mm 3340 Gs
334.0 mT
 0.35 kg / 0.76 pounds
346.3 g / 3.4 N
 safe
5 mm 2152 Gs
215.2 mT
 0.14 kg / 0.32 pounds
143.8 g / 1.4 N
 safe
10 mm 822 Gs
82.2 mT
 0.02 kg / 0.05 pounds
21.0 g / 0.2 N
 safe
15 mm 394 Gs
39.4 mT
 0.00 kg / 0.01 pounds
4.8 g / 0.0 N
 safe
20 mm 221 Gs
22.1 mT
 0.00 kg / 0.00 pounds
1.5 g / 0.0 N
 safe
30 mm 92 Gs
9.2 mT
 0.00 kg / 0.00 pounds
0.3 g / 0.0 N
 safe
50 mm 28 Gs
2.8 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
Magnetic force drops sharply with every subsequent millimeter of distance. Note that even a microscopic distance (e.g., dirt, paint, dust) noticeably reduces the pull force. Neodymiums work optimally in perfect adhesion; distance drastically cuts the force. Observe how quickly the load capacity plummet, when the magnet does not adhere directly to the metal substrate. When designing the arrangement, discard additional spacers.

Table 2: Slippage 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
This section calculates the estimated force required to start the downward movement of the magnet downwards against a upright steel wall (assuming standard friction). This parameter depends on the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - 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 surface (e.g., a car body), it you can count on just approx. 1/5 of its nominal power. Gravitational force as well as a weak degree of grip influence the fact that holders slip faster than they pop off the substrate. Want to create a wall mount? Note that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the element will give way down under a significantly smaller weight. Application of an anti-slip pad can drastically improve the result.

Table 4: Steel thickness (saturation) - 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 too thin steel is not enough to focus the full magnetic flux, which wastes potential of the holder. If you attach a powerful product to a weak sheet, the magnetism will pass right through and the holding will be smaller. To squeeze 100% of this magnet's power, you require a sufficiently solid piece of metal. The saturation phenomenon means that on sheet metal structures (e.g., car bodies), the product holds weaker. We advise picking the steel cross-section from these parameters.

Table 5: Thermal resistance (stability) - 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
Standard neodymium magnets change their properties parameters above the temperature limit. Watch out for overheating – heat can irreversibly demagnetize this product. With every degree above norm, the magnet's force temporarily lowers. Refrain from using this magnet close to heaters higher than its operating temperature limit. Too high temperature will result in destruction of magnetic properties.
*Important note: Heat tolerance is determined by both grade, but also on the magnet's shape. Thin 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: Magnet-Magnet interaction (repulsion) - field range
MP 12x5x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 significantly greater distance than a magnet and steel setup. The setup of two magnets generates a stronger field and a further horizon of performance. Want to build a solid fastener? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when attracting two neodymiums, the collision energy is massive. The levitation is marginally weaker than the connection force, but still significant.
*Flux density for N-N configuration drops to ~0 Gs at the midpoint of the gap (due to field cancellation).
Note: Figures show friction force of a pair of matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - 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
Timepiece 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 IT equipment as well as pacemakers. These magnets produce a field that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and plastic. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
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
NdFeB products are prone to chipping – a violent impact against metal can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or painful pinches to skin. Hold the magnet firmly during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed means shattering of the neodymium. Use safety goggles when playing 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
MP 12x5x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 503 Mx 65.0 µWb
Pc Coefficient 1.34 High (Stable)
Total magnetic flux emitted by the pole surface. Key data in coil applications and motors. Pc value determines the magnet's operating point.

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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet retains just a fraction of its perpendicular strength.

2. Plate thickness effect

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

3. Power loss vs temp

*For standard magnets, the safety limit 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.

Technical specification and ecology
Chemical composition
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: 030498-2026
Quick Unit Converter
Force (pull)
Field Strength
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The ring-shaped magnet MP 12x5x2 / 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 1.15 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 rubber spacer 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. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
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. Aesthetic mounting requires selecting the appropriate head size.
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 product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 5 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.

Pros and cons of neodymium magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over around 10 years their performance decreases symbolically – ~1% (in testing),
  • They show high resistance to demagnetization induced by external disturbances,
  • Thanks to the reflective finish, the coating of Ni-Cu-Ni, gold-plated, or silver gives an clean appearance,
  • Magnetic induction on the surface of the magnet turns out to be maximum,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in constructing and the ability to adapt to individual projects,
  • Versatile presence in modern industrial fields – they find application in hard drives, drive modules, advanced medical instruments, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in compact constructions

Weaknesses

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • 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
  • Due to limitations in realizing threads and complex shapes in magnets, we propose using a housing - magnetic holder.
  • Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Furthermore, small elements of these products can be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

The lifting capacity listed is a measurement result performed under specific, ideal conditions:
  • with the application of a sheet made of special test steel, ensuring maximum field concentration
  • whose transverse dimension equals approx. 10 mm
  • with a plane cleaned and smooth
  • with direct contact (without paint)
  • during pulling in a direction vertical to the plane
  • at room temperature

Practical lifting capacity: influencing factors

Effective lifting capacity is influenced by working environment parameters, including (from most important):
  • Distance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force 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 generating force.
  • Steel type – mild steel attracts best. Alloy steels decrease magnetic properties and lifting capacity.
  • Base smoothness – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Precautions when working with neodymium magnets
Dust explosion hazard

Fire hazard: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

Conscious usage

Handle magnets consciously. Their huge power can shock even experienced users. Plan your moves and respect their force.

Skin irritation risks

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, cease handling magnets and use protective gear.

GPS and phone interference

Note: neodymium magnets generate a field that confuses precision electronics. Keep a safe distance from your phone, tablet, and GPS.

Eye protection

Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Finger safety

Watch your fingers. Two large magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

Magnetic media

Equipment safety: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, mechanical watches).

Do not overheat magnets

Do not overheat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, look for HT versions (H, SH, UH).

Product not for children

Absolutely store magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are tragic.

Pacemakers

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or ask another person to handle the magnets.

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