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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 parameters »

1.230 ZŁ with VAT / pcs + price for transport

1.000 ZŁ net + 23% VAT / pcs

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Strength as well as shape of a neodymium magnet can be estimated using our magnetic mass calculator.

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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

Physical simulation of the assembly - technical parameters

Presented values represent the result of a physical analysis. Values are based on models for the material Nd2Fe14B. Operational conditions might slightly differ. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static force (pull vs gap) - 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
Pulling power decreases sharply per each millimeter of gap. Remember that even a very thin break (e.g., contamination, paint, veneer) strongly diminishes the holding power. Magnets work optimally at the point of direct contact; air break drastically cuts the force. Analyze how rapidly the pull force fall, when the magnet does not adhere directly to the steel surface. When calculating the mounting, avoid unnecessary gaps.

Table 2: Shear hold (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 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 following data presents the theoretical force required to cause the shifting of the magnet downwards along a vertical steel wall (assuming standard friction). This value depends on the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 placing a holder on a upright surface (e.g., a board), it you can count on barely about 20%-30% of its nominal power. Gravity and a weak degree of grip cause that holders slip faster than they detach. Planning a wall mount? Note that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the magnet will slide down under a significantly smaller cargo. Application of an anti-slip pad can significantly raise the stability.

Table 4: Steel thickness (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 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 metal plate is unable to conduct the entire magnetic field, which wastes potential of the magnet. Should you attach a powerful product to a too thin substrate, the flux will pass right through and the pull force will drop sharply. To achieve 100% of this magnet's power, you require a sufficiently solid backing of metal. The material oversaturation means that on sheet metal structures (e.g., car bodies), the product holds weaker. We advise picking the steel dimension from these parameters.

Table 5: Thermal stability (stability) - power drop
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 after exceeding the maximum temperature. Protect against heat – heat can permanently destroy this magnet. As the temperature rises, the magnet's power temporarily drops. Avoid using this magnet in hot environments exceeding its operating temperature limit. Exceeding the critical threshold will cause permanent loss of magnetic properties.
*Technical advisory: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) may lose charge permanently sooner compared to rod magnets. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 12x5x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 strong neodymiums attract each other from a much further distance than a magnet and sheet combination. Such a system of magnet-to-magnet generates a stronger field and a further horizon of action. Want to build a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Be careful that when bringing together two magnets, the impact force is extreme. The levitation is marginally weaker than the attraction, but still large.
*Flux density between like poles is approximately ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Attention: Estimates apply to sliding force of two matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - warnings
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
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 poses a real danger to electronic devices and pacemakers. These NdFeB products generate a flux that prevents correct functioning of digital equipment. Remember: the unseen radiation acts through matter and glass. Special caution must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - 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
Neodymium magnets are prone to chipping – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force can destroy the magnet or painful pinches to fingers. Be sure to control the product during installation so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear eye protection when working with large magnets.

Table 9: Surface protection spec
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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
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 passing through the magnet pole. Essential parameter when building generators and motors. Pc value defines the working geometry.

Table 11: Physics of underwater searching
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

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

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically reduces the holding force.

3. Temperature resistance

*For N38 material, 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.

Technical and environmental data
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%
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
Magnet Unit Converter
Pulling force
Field Strength
Insert a value into any field, to see all other values will recalculate on the fly.

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The ring-shaped magnet MP 12x5x2 / 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 material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain caution. 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.
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 magnets in hermetic housing 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. 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.
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 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. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros and cons of neodymium magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • They maintain their magnetic properties even under external field action,
  • In other words, due to the glossy finish of silver, the element gains visual value,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Considering the potential of free forming and customization to specialized solutions, neodymium magnets can be modeled in a broad palette of shapes and sizes, which amplifies use scope,
  • Significant place in electronics industry – they are used in magnetic memories, electric drive systems, precision medical tools, as well as complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Limitations

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating threads and complex forms in magnets, we propose using cover - magnetic mechanism.
  • Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these products can complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

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

The specified lifting capacity refers to the limit force, measured under ideal test conditions, specifically:
  • with the contact of a sheet made of special test steel, ensuring full magnetic saturation
  • with a cross-section no less than 10 mm
  • with a surface perfectly flat
  • under conditions of gap-free contact (surface-to-surface)
  • under axial application of breakaway force (90-degree angle)
  • at ambient temperature room level

Practical aspects of lifting capacity – factors

Holding efficiency impacted by specific conditions, such as (from priority):
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Plate thickness – insufficiently thick steel does not close the flux, causing part of the power to be lost into the air.
  • Steel type – mild steel gives the best results. Higher carbon content lower magnetic permeability and holding force.
  • Surface structure – the more even the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Warnings
Life threat

For implant holders: Powerful magnets affect electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Handling guide

Exercise caution. Neodymium magnets attract from a distance and connect with huge force, often faster than you can react.

Material brittleness

Beware of splinters. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Swallowing risk

Always keep magnets away from children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are fatal.

Electronic hazard

Do not bring magnets near a purse, computer, or screen. The magnetism can permanently damage these devices and erase data from cards.

Physical harm

Big blocks can break fingers instantly. Under no circumstances put your hand between two attracting surfaces.

Demagnetization risk

Keep cool. Neodymium magnets are sensitive to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Threat to navigation

A powerful magnetic field disrupts the functioning of magnetometers in smartphones and GPS navigation. Do not bring magnets near a device to avoid breaking the sensors.

Allergic reactions

It is widely known that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or select coated magnets.

Dust is flammable

Dust created during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.

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