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MP 5x2.7/1.2x5 C / N38 - ring magnet

ring magnet

Catalog no 030201

GTIN/EAN: 5906301812180

5.00

Diameter

5 mm [±0,1 mm]

internal diameter Ø

2.7/1.2 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

0.69 g

Magnetization Direction

↑ axial

Load capacity

0.75 kg / 7.31 N

Magnetic Induction

553.14 mT / 5531 Gs

Coating

[NiCuNi] Nickel

product parameters »

0.836 ZŁ with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

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Lifting power as well as structure of a neodymium magnet can be verified using our force calculator.

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Technical specification - MP 5x2.7/1.2x5 C / N38 - ring magnet

Specification / characteristics - MP 5x2.7/1.2x5 C / N38 - ring magnet

properties
properties values
Cat. no. 030201
GTIN/EAN 5906301812180
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 5 mm [±0,1 mm]
internal diameter Ø 2.7/1.2 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 0.69 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.75 kg / 7.31 N
Magnetic Induction ~ ? 553.14 mT / 5531 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 5x2.7/1.2x5 C / 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 modeling of the magnet - report

Presented values represent the outcome of a physical simulation. Values rely on models for the material Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Please consider these calculations as a reference point during assembly planning.

Table 1: Static force (force vs gap) - characteristics
MP 5x2.7/1.2x5 C / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5322 Gs
532.2 mT
 0.75 kg / 1.65 lbs
750.0 g / 7.4 N
 low risk
1 mm 3295 Gs
329.5 mT
 0.29 kg / 0.63 lbs
287.5 g / 2.8 N
 low risk
2 mm 1883 Gs
188.3 mT
 0.09 kg / 0.21 lbs
93.9 g / 0.9 N
 low risk
3 mm 1098 Gs
109.8 mT
 0.03 kg / 0.07 lbs
31.9 g / 0.3 N
 low risk
5 mm 440 Gs
44.0 mT
 0.01 kg / 0.01 lbs
5.1 g / 0.1 N
 low risk
10 mm 92 Gs
9.2 mT
 0.00 kg / 0.00 lbs
0.2 g / 0.0 N
 low risk
15 mm 33 Gs
3.3 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
20 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
30 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
Magnetic force drops sharply per each millimeter of gap. Keep in mind that even a very thin break (e.g., contamination, varnish, dust) significantly weakens the grip. Magnets work most effectively at the point of direct contact; distance weakens the force. Notice how quickly the pull force drop, when the magnet does not adhere tightly to the steel surface. When planning the mounting, eliminate unnecessary gaps.

Table 2: Vertical load (vertical surface)
MP 5x2.7/1.2x5 C / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.15 kg / 0.33 lbs
150.0 g / 1.5 N
1 mm Stal (~0.2) 0.06 kg / 0.13 lbs
58.0 g / 0.6 N
2 mm Stal (~0.2) 0.02 kg / 0.04 lbs
18.0 g / 0.2 N
3 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
5 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 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 defines the theoretical shear load needed to cause the shifting of the magnet downwards against a upright metal surface (assuming standard friction coefficient). This value is a function of the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 5x2.7/1.2x5 C / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.22 kg / 0.50 lbs
225.0 g / 2.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.15 kg / 0.33 lbs
150.0 g / 1.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.08 kg / 0.17 lbs
75.0 g / 0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.38 kg / 0.83 lbs
375.0 g / 3.7 N
When mounting a magnet on a upright wall (e.g., a car body), it will maintain barely approx. 20%-30% of its nominal power. Gravity and a weak degree of grip influence the fact that magnets slide down faster than they pop off the substrate. Planning a wall mount? Remember that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will slip down under a significantly smaller cargo. Utilizing a rubberized pad can drastically improve the result.

Table 4: Material efficiency (saturation) - power losses
MP 5x2.7/1.2x5 C / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.08 kg / 0.17 lbs
75.0 g / 0.7 N
1 mm
25%
 0.19 kg / 0.41 lbs
187.5 g / 1.8 N
2 mm
50%
 0.38 kg / 0.83 lbs
375.0 g / 3.7 N
3 mm
75%
 0.56 kg / 1.24 lbs
562.5 g / 5.5 N
5 mm
100%
 0.75 kg / 1.65 lbs
750.0 g / 7.4 N
10 mm
100%
 0.75 kg / 1.65 lbs
750.0 g / 7.4 N
11 mm
100%
 0.75 kg / 1.65 lbs
750.0 g / 7.4 N
12 mm
100%
 0.75 kg / 1.65 lbs
750.0 g / 7.4 N
A thin sheet cannot absorb the entire magnetic field, which wastes potential of the magnet. Should you install a neodymium to a too thin substrate, the field will penetrate right through and the holding will be smaller. To utilize full efficiency of this neodymium's power, you require a sufficiently solid element of metal. The saturation effect means that on sheet metal structures (e.g., appliance housings), the magnet works worse. We recommend selecting the steel cross-section based on the following data.

Table 5: Working in heat (material behavior) - thermal limit
MP 5x2.7/1.2x5 C / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.75 kg / 1.65 lbs
750.0 g / 7.4 N
 OK
40 °C -2.2% 0.73 kg / 1.62 lbs
733.5 g / 7.2 N
 OK
60 °C -4.4% 0.72 kg / 1.58 lbs
717.0 g / 7.0 N
 OK
80 °C -6.6% 0.70 kg / 1.54 lbs
700.5 g / 6.9 N
100 °C -28.8% 0.53 kg / 1.18 lbs
534.0 g / 5.2 N
Ordinary NdFeB products lose power above the temperature limit. Watch out for overheating – heat can irreversibly demagnetize this product. As the temperature rises, the magnet's power briefly lowers. Refrain from using this magnet close to ovens exceeding its working range. Ignoring the limit will cause permanent loss of magnetism.
*Engineering note: Temperature resistance is determined by both grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) may lose charge permanently sooner than long magnets. Red status in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
MP 5x2.7/1.2x5 C / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.75 kg / 6.06 lbs
5 924 Gs
0.41 kg / 0.91 lbs
412 g / 4.0 N
 N/A
1 mm 1.77 kg / 3.90 lbs
8 541 Gs
0.27 kg / 0.58 lbs
265 g / 2.6 N
 1.59 kg / 3.51 lbs
~0 Gs
2 mm 1.05 kg / 2.32 lbs
6 590 Gs
0.16 kg / 0.35 lbs
158 g / 1.5 N
 0.95 kg / 2.09 lbs
~0 Gs
3 mm 0.60 kg / 1.33 lbs
4 992 Gs
0.09 kg / 0.20 lbs
91 g / 0.9 N
 0.54 kg / 1.20 lbs
~0 Gs
5 mm 0.20 kg / 0.44 lbs
2 860 Gs
0.03 kg / 0.07 lbs
30 g / 0.3 N
 0.18 kg / 0.39 lbs
~0 Gs
10 mm 0.02 kg / 0.04 lbs
880 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
20 mm 0.00 kg / 0.00 lbs
184 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
50 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
60 mm 0.00 kg / 0.00 lbs
10 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
6 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
4 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
3 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
2 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 connection of two magnets creates a more powerful interaction and a larger range of performance. Designing a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the pinch force is massive. The levitation is a bit weaker than the connection force, but still impressive.
*Field value for N-N configuration drops to ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Note: Estimates demonstrate sliding force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - warnings
MP 5x2.7/1.2x5 C / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.0 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Timepiece 20 Gs (2.0 mT) 2.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 1.5 cm
Remote 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm
Powerful magnet radiation is a large risk to IT equipment as well as medical implants. These NdFeB products produce a field that disrupts operation of digital equipment. Remember: the invisible magnetic field acts through matter and plastic. Exceptional care must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, remotes, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
MP 5x2.7/1.2x5 C / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 33.26 km/h
(9.24 m/s)
 0.03 J
30 mm 57.59 km/h
(16.00 m/s)
 0.09 J
50 mm 74.35 km/h
(20.65 m/s)
 0.15 J
100 mm 105.14 km/h
(29.21 m/s)
 0.29 J
NdFeB products are very brittle – a collision with steel risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can cause material chips or injury to fingers. Hold the magnet firmly during mounting so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MP 5x2.7/1.2x5 C / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MP 5x2.7/1.2x5 C / N38

Parameter Value SI Unit / Description
Magnetic Flux 862 Mx 8.6 µWb
Pc Coefficient 0.83 High (Stable)
Flux value emitted by the pole surface. Key data when building generators and motors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 5x2.7/1.2x5 C / N38

Environment Effective steel pull Effect
Air (land) 0.75 kg Standard
Water (riverbed) 0.86 kg
(+0.11 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.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Vertical hold

*Warning: On a vertical wall, the magnet holds only ~20% of its max power.

2. Steel thickness impact

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

3. Power loss vs temp

*For N38 grade, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.83

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: 030201-2026
Measurement Calculator
Force (pull)
Magnetic Induction
Insert a value into a field, and all other values change on the fly.

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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 0.75 kg works great as a cabinet closure, 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. 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 2.7/1.2 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 (5 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø5x5 mm and a weight of 0.69 g. The pulling force of this model is an impressive 0.75 kg, which translates to 7.31 N in newtons. The mounting hole diameter is precisely 2.7/1.2 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages as well as disadvantages of rare earth magnets.

Advantages

Apart from their superior holding force, neodymium magnets have these key benefits:
  • They do not lose magnetism, even during nearly 10 years – the drop in lifting capacity is only ~1% (based on measurements),
  • They are resistant to demagnetization induced by presence of other magnetic fields,
  • In other words, due to the aesthetic surface of silver, the element gains visual value,
  • Magnets exhibit huge magnetic induction on the outer layer,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to versatility in designing and the ability to adapt to unusual requirements,
  • Key role in electronics industry – they find application in data components, drive modules, precision medical tools, also industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets lose their force 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 stability even at temperatures up to 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 resistant to moisture, when using outdoors
  • We suggest a housing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated forms.
  • Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to expensive raw materials, their price is higher than average,

Pull force analysis

Maximum lifting capacity of the magnet – what contributes to it?

Breakaway force was defined for the most favorable conditions, including:
  • on a plate made of mild steel, effectively closing the magnetic flux
  • whose thickness is min. 10 mm
  • characterized by even structure
  • under conditions of no distance (surface-to-surface)
  • under vertical force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Bear in mind that the working load may be lower depending on the following factors, in order of importance:
  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
  • Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was assessed with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance between the magnet and the plate lowers the holding force.

Safe handling of neodymium magnets
Sensitization to coating

Certain individuals suffer from a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause a rash. We strongly advise wear safety gloves.

Implant safety

Individuals with a pacemaker have to keep an absolute distance from magnets. The magnetic field can disrupt the operation of the implant.

GPS and phone interference

An intense magnetic field disrupts the functioning of compasses in phones and GPS navigation. Keep magnets near a device to prevent damaging the sensors.

Do not underestimate power

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

Flammability

Machining of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Cards and drives

Powerful magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Keep a distance of at least 10 cm.

Do not give to children

Only for adults. Tiny parts pose a choking risk, causing serious injuries. Keep out of reach of kids and pets.

Risk of cracking

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Demagnetization risk

Standard neodymium magnets (grade N) lose power when the temperature goes above 80°C. Damage is permanent.

Pinching danger

Protect your hands. Two powerful magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

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