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MP 12x5x2 / N38 - ring magnet

ring magnet

Catalog no 030498

Load capacity 1.15 kg / 11.29 N Magnetic Induction 195.97 mT / 1960 Gs
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
Coating
[NiCuNi] Nickel
see properties »

1.230 zł with VAT / pcs + price for transport

1.000 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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Technical - 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 modeling of the magnet - data

The following data represent the outcome of a mathematical analysis. Results rely on models for the class Nd2Fe14B. Operational parameters may differ. Treat these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - interaction chart
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 LBS
1150.0 g / 11.3 N
 weak grip
1 mm 5082 Gs
508.2 mT
 0.80 kg / 1.77 LBS
802.2 g / 7.9 N
 weak grip
2 mm 4147 Gs
414.7 mT
 0.53 kg / 1.18 LBS
534.0 g / 5.2 N
 weak grip
3 mm 3340 Gs
334.0 mT
 0.35 kg / 0.76 LBS
346.3 g / 3.4 N
 weak grip
5 mm 2152 Gs
215.2 mT
 0.14 kg / 0.32 LBS
143.8 g / 1.4 N
 weak grip
10 mm 822 Gs
82.2 mT
 0.02 kg / 0.05 LBS
21.0 g / 0.2 N
 weak grip
15 mm 394 Gs
39.4 mT
 0.00 kg / 0.01 LBS
4.8 g / 0.0 N
 weak grip
20 mm 221 Gs
22.1 mT
 0.00 kg / 0.00 LBS
1.5 g / 0.0 N
 weak grip
30 mm 92 Gs
9.2 mT
 0.00 kg / 0.00 LBS
0.3 g / 0.0 N
 weak grip
50 mm 28 Gs
2.8 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
Grip strength decreases sharply with every subsequent millimeter of spacing. Remember that even a microscopic distance (e.g., dirt, paint, dust) noticeably weakens the grip. Magnetic products work strongest in perfect adhesion; distance drastically cuts the power. Observe how quickly the load capacity drop, when the product does not touch directly to the steel surface. When designing the arrangement, discard unnecessary gaps.

Table 2: Sliding capacity (wall)
MP 12x5x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.23 kg / 0.51 LBS
230.0 g / 2.3 N
1 mm Stal (~0.2) 0.16 kg / 0.35 LBS
160.0 g / 1.6 N
2 mm Stal (~0.2) 0.11 kg / 0.23 LBS
106.0 g / 1.0 N
3 mm Stal (~0.2) 0.07 kg / 0.15 LBS
70.0 g / 0.7 N
5 mm Stal (~0.2) 0.03 kg / 0.06 LBS
28.0 g / 0.3 N
10 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 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 table below indicates the theoretical shear load sufficient to cause the slippage of the magnet down along a vertical metal surface (considering typical friction). This value is relative to 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 LBS
345.0 g / 3.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.23 kg / 0.51 LBS
230.0 g / 2.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.11 kg / 0.25 LBS
115.0 g / 1.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.58 kg / 1.27 LBS
575.0 g / 5.6 N
When hanging a magnet on a upright plane (e.g., a board), it will only hold only approx. 20%-30% of its maximum pull force. Gravity and a weak degree of grip cause that products move down faster than they pop off the substrate. Designing a wall mount? Consider that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the magnet will slide down under a significantly smaller cargo. Using a rubber layer can effectively increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MP 12x5x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.11 kg / 0.25 LBS
115.0 g / 1.1 N
1 mm
25%
 0.29 kg / 0.63 LBS
287.5 g / 2.8 N
2 mm
50%
 0.58 kg / 1.27 LBS
575.0 g / 5.6 N
3 mm
75%
 0.86 kg / 1.90 LBS
862.5 g / 8.5 N
5 mm
100%
 1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
10 mm
100%
 1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
11 mm
100%
 1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
12 mm
100%
 1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
A thin sheet is incapable of absorb the full magnetic flux, which weakens actual performance of the holder. If you attach a powerful product to a thin surface, the magnetism will pass right through and the holding will be smaller. To achieve 100% of this magnet's power, you require a sufficiently solid backing of steel. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the magnet shows lower pull force. We recommend selecting the steel dimension according to the table below.

Table 5: Thermal resistance (stability) - thermal limit
MP 12x5x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
 OK
40 °C -2.2% 1.12 kg / 2.48 LBS
1124.7 g / 11.0 N
 OK
60 °C -4.4% 1.10 kg / 2.42 LBS
1099.4 g / 10.8 N
 OK
80 °C -6.6% 1.07 kg / 2.37 LBS
1074.1 g / 10.5 N
100 °C -28.8% 0.82 kg / 1.81 LBS
818.8 g / 8.0 N
Classic neodymiums irreversibly lose strength past the thermal threshold. Avoid high temperatures – high temperature can irreversibly damage this magnet. With increasing heat, the neodymium's force temporarily drops. Avoid using this product near heat sources exceeding its safe range. Too high temperature will cause permanent loss of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) risk losing magnetic properties under lower heat stress than taller cylinders. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field range
MP 12x5x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 21.34 kg / 47.04 LBS
6 163 Gs
3.20 kg / 7.06 LBS
3201 g / 31.4 N
 N/A
1 mm 17.97 kg / 39.61 LBS
11 168 Gs
2.69 kg / 5.94 LBS
2695 g / 26.4 N
 16.17 kg / 35.65 LBS
~0 Gs
2 mm 14.88 kg / 32.81 LBS
10 165 Gs
2.23 kg / 4.92 LBS
2233 g / 21.9 N
 13.40 kg / 29.53 LBS
~0 Gs
3 mm 12.20 kg / 26.89 LBS
9 202 Gs
1.83 kg / 4.03 LBS
1830 g / 17.9 N
 10.98 kg / 24.20 LBS
~0 Gs
5 mm 8.00 kg / 17.63 LBS
7 450 Gs
1.20 kg / 2.64 LBS
1199 g / 11.8 N
 7.20 kg / 15.87 LBS
~0 Gs
10 mm 2.67 kg / 5.88 LBS
4 304 Gs
0.40 kg / 0.88 LBS
400 g / 3.9 N
 2.40 kg / 5.30 LBS
~0 Gs
20 mm 0.39 kg / 0.86 LBS
1 644 Gs
0.06 kg / 0.13 LBS
58 g / 0.6 N
 0.35 kg / 0.77 LBS
~0 Gs
50 mm 0.01 kg / 0.02 LBS
275 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.02 LBS
~0 Gs
60 mm 0.00 kg / 0.01 LBS
184 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.01 LBS
129 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
95 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
72 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
56 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnets interact from a wider radius than a magnet and sheet combination. The setup of magnet-to-magnet generates a stronger field and a further horizon of performance. Designing a strong closure? Apply two magnets instead of a neodymium and a steel. Remember that when attracting two neodymiums, the pinch force is extreme. The levitation is slightly lower than the connection force, but still significant.
*Field value for N-N configuration drops to ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
* Estimates apply to sliding force of a pair of same neodymium 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
Mobile device 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
Powerful magnet radiation is a large risk to electronic devices and medical implants. These NdFeB products produce a flux that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field penetrates the body and housings. Exceptional care must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
MP 12x5x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.69 km/h
(6.30 m/s)
 0.03 J
30 mm 22.98 km/h
(6.38 m/s)
 0.03 J
50 mm 22.99 km/h
(6.39 m/s)
 0.03 J
100 mm 22.99 km/h
(6.39 m/s)
 0.03 J
NdFeB products are prone to chipping – a violent impact against metal can result in shattering. Pay attention to connection velocity – a magnet released freely becomes dangerous. Kinetic force can destroy the magnet or dangerous crushing to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the metal. A collision at high speed ends with a crack of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Corrosion resistance
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
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 magnet pole. Essential parameter for generator designers as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.

1. Vertical hold

*Note: On a vertical surface, the magnet holds only approx. 20-30% of its nominal pull.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) severely reduces 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) = 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

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%

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
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The ring magnet with a hole MP 12x5x2 / N38 is created for permanent mounting, 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. 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 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 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. Damage to the protective layer during assembly is the most common cause of rusting. 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 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.
This model is characterized by dimensions Ø12x2 mm and a weight of 1.4 g. The pulling force of this model is an impressive 1.15 kg, which translates to 11.29 N in newtons. The mounting hole diameter is precisely 5 mm.
The poles are located on the planes with holes, not on the sides of the ring. 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 neodymium magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • Their power is maintained, and after around 10 years it decreases only by ~1% (according to research),
  • Magnets effectively resist against demagnetization caused by ambient magnetic noise,
  • A magnet with a metallic silver surface has better aesthetics,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • 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...
  • Due to the ability of free shaping and customization to specialized requirements, neodymium magnets can be manufactured in a wide range of geometric configurations, which amplifies use scope,
  • Key role in innovative solutions – they are used in magnetic memories, electric motors, medical equipment, and modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their power 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 stable to moisture, in case of application outdoors
  • Limited ability of producing nuts in the magnet and complex forms - recommended is casing - mounting mechanism.
  • Possible danger related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Furthermore, small elements of these products are able to be problematic in diagnostics medical when they are in 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

Pull force analysis

Maximum holding power of the magnet – what contributes to it?

Breakaway force was defined for optimal configuration, taking into account:
  • on a block made of structural steel, perfectly concentrating the magnetic flux
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a plane free of scratches
  • with direct contact (no coatings)
  • under vertical force vector (90-degree angle)
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

Please note that the working load may be lower depending on the following factors, in order of importance:
  • Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin steel does not close the flux, causing part of the power to be escaped into the air.
  • Plate material – mild steel gives the best results. Higher carbon content reduce magnetic permeability and holding force.
  • Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Thermal limits

Monitor thermal conditions. Exposing the magnet to high heat will permanently weaken its properties and pulling force.

Eye protection

Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

GPS Danger

Navigation devices and smartphones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Mechanical processing

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Protect data

Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, medical aids, timepieces).

Warning for allergy sufferers

Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, immediately stop handling magnets and wear gloves.

Medical implants

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Caution required

Handle with care. Neodymium magnets attract from a distance and snap with huge force, often quicker than you can move away.

Bodily injuries

Risk of injury: The pulling power is so great that it can result in hematomas, crushing, and broken bones. Use thick gloves.

Adults only

Only for adults. Tiny parts pose a choking risk, leading to serious injuries. Store away from children and animals.

Caution! Details about hazards in the article: Safety of working with magnets.