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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

view technical specifications »

0.836 ZŁ with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

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Technical parameters of the product - 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

Technical simulation of the magnet - data

The following values constitute the result of a mathematical calculation. Results rely on algorithms for the material Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Please consider these data as a supplementary guide 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 pounds
750.0 g / 7.4 N
 low risk
1 mm 3295 Gs
329.5 mT
 0.29 kg / 0.63 pounds
287.5 g / 2.8 N
 low risk
2 mm 1883 Gs
188.3 mT
 0.09 kg / 0.21 pounds
93.9 g / 0.9 N
 low risk
3 mm 1098 Gs
109.8 mT
 0.03 kg / 0.07 pounds
31.9 g / 0.3 N
 low risk
5 mm 440 Gs
44.0 mT
 0.01 kg / 0.01 pounds
5.1 g / 0.1 N
 low risk
10 mm 92 Gs
9.2 mT
 0.00 kg / 0.00 pounds
0.2 g / 0.0 N
 low risk
15 mm 33 Gs
3.3 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
20 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
30 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Pulling power decreases drastically with every mm of spacing. Keep in mind that even a microscopic distance (e.g., dirt, varnish, dust) noticeably weakens the grip. Magnetic products operate optimally at the point of direct contact; gap drastically cuts the power. Notice how rapidly the load capacity fall, when the magnet does not touch flatly to the steel surface. When planning the assembly, avoid unnecessary gaps.

Table 2: Slippage hold (wall)
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 pounds
150.0 g / 1.5 N
1 mm Stal (~0.2) 0.06 kg / 0.13 pounds
58.0 g / 0.6 N
2 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
3 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 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 presents the theoretical force necessary to start the downward movement of the magnet vertically along a vertical metal surface (considering typical friction coefficient). This value varies with the distance between the magnet and the metal.

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 pounds
225.0 g / 2.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.15 kg / 0.33 pounds
150.0 g / 1.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.08 kg / 0.17 pounds
75.0 g / 0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.38 kg / 0.83 pounds
375.0 g / 3.7 N
When hanging a magnet on a vertical wall (e.g., a fridge), it will maintain barely approx. 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient influence the fact that holders slide down faster than they pull off. Designing a hanger? Note that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the element will slip down under a much lighter cargo. Using a rubber coating can effectively improve the result.

Table 4: Material efficiency (substrate influence) - 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 pounds
75.0 g / 0.7 N
1 mm
25%
 0.19 kg / 0.41 pounds
187.5 g / 1.8 N
2 mm
50%
 0.38 kg / 0.83 pounds
375.0 g / 3.7 N
3 mm
75%
 0.56 kg / 1.24 pounds
562.5 g / 5.5 N
5 mm
100%
 0.75 kg / 1.65 pounds
750.0 g / 7.4 N
10 mm
100%
 0.75 kg / 1.65 pounds
750.0 g / 7.4 N
11 mm
100%
 0.75 kg / 1.65 pounds
750.0 g / 7.4 N
12 mm
100%
 0.75 kg / 1.65 pounds
750.0 g / 7.4 N
A thin sheet is incapable of focus the full magnetic flux, which weakens actual performance of the holder. Should you mount a strong magnet to a weak sheet, the field will penetrate right through and the holding will be smaller. To utilize the maximum of this magnet's potential, you need a suitably thick backing of steel. The material oversaturation means that on thin elements (e.g., car bodies), the product works worse. We recommend selecting the steel dimension according to the table below.

Table 5: Thermal stability (material behavior) - resistance threshold
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 pounds
750.0 g / 7.4 N
 OK
40 °C -2.2% 0.73 kg / 1.62 pounds
733.5 g / 7.2 N
 OK
60 °C -4.4% 0.72 kg / 1.58 pounds
717.0 g / 7.0 N
 OK
80 °C -6.6% 0.70 kg / 1.54 pounds
700.5 g / 6.9 N
100 °C -28.8% 0.53 kg / 1.18 pounds
534.0 g / 5.2 N
Ordinary NdFeB products change their properties parameters after exceeding the maximum temperature. Avoid high temperatures – heat can permanently destroy this magnet. As the temperature rises, the magnet's force momentarily decreases. Refrain from using this product near heat sources exceeding its working range. Too high temperature will cause irreversible degradation of magnetism.
*Important note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) are more susceptible to demagnetization sooner compared to rod magnets. The danger warning in the table signals permanent field degradation for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.75 kg / 6.06 pounds
5 924 Gs
0.41 kg / 0.91 pounds
412 g / 4.0 N
 N/A
1 mm 1.77 kg / 3.90 pounds
8 541 Gs
0.27 kg / 0.58 pounds
265 g / 2.6 N
 1.59 kg / 3.51 pounds
~0 Gs
2 mm 1.05 kg / 2.32 pounds
6 590 Gs
0.16 kg / 0.35 pounds
158 g / 1.5 N
 0.95 kg / 2.09 pounds
~0 Gs
3 mm 0.60 kg / 1.33 pounds
4 992 Gs
0.09 kg / 0.20 pounds
91 g / 0.9 N
 0.54 kg / 1.20 pounds
~0 Gs
5 mm 0.20 kg / 0.44 pounds
2 860 Gs
0.03 kg / 0.07 pounds
30 g / 0.3 N
 0.18 kg / 0.39 pounds
~0 Gs
10 mm 0.02 kg / 0.04 pounds
880 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
184 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
16 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
10 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
6 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
4 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
3 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
2 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal setup. The connection of magnet-to-magnet produces a massive flux and a further horizon of operation. Planning to create a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Remember that when bringing together two magnets, the pinch force is huge. The repulsion force is marginally weaker than the connection force, but still large.
*Flux density in repulsion mode drops to ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Important: Estimates apply to shear force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - precautionary measures
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
Mechanical watch 20 Gs (2.0 mT) 2.0 cm
Mobile device 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
Extremely neodym field is a serious hazard to IT equipment and pacemakers. These NdFeB products generate a flux that destroys function of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and housings. Increased vigilance 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, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
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
Neodymium magnets are prone to chipping – a collision with steel can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Kinetic force can destroy the magnet or dangerous crushing to fingers. Be sure to control the product during installation so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the magnet. Wear eye protection when handling with large magnets.

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)
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 (Flux)
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 for generator designers and motors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Warning: On a vertical surface, the magnet retains merely a fraction of its max power.

2. Plate thickness effect

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

3. Thermal stability

*For N38 material, 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
Elemental analysis
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: 030201-2026
Measurement Calculator
Magnet pull force
Magnetic Induction
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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. Mounting is clean and reversible, unlike gluing. This product with a force of 0.75 kg works great as a door latch, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 5x2.7/1.2x5 C / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure 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.
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. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.
It is a magnetic ring with a diameter of 5 mm and thickness 5 mm. The pulling force of this model is an impressive 0.75 kg, which translates to 7.31 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 2.7/1.2 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths as well as weaknesses of neodymium magnets.

Pros

Besides their high retention, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • Magnets perfectly resist against demagnetization caused by foreign field sources,
  • The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to look better,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Due to the potential of precise shaping and customization to individualized projects, NdFeB magnets can be manufactured in a wide range of forms and dimensions, which makes them more universal,
  • Wide application in high-tech industry – they are utilized in hard drives, drive modules, diagnostic systems, as well as technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of neodymium magnets:
  • At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in producing threads and complex forms in magnets, we recommend using a housing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these products can be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what it depends on?

The specified lifting capacity concerns the limit force, recorded under laboratory conditions, namely:
  • using a plate made of low-carbon steel, acting as a magnetic yoke
  • whose transverse dimension reaches at least 10 mm
  • with an ideally smooth contact surface
  • with direct contact (without impurities)
  • during pulling in a direction vertical to the plane
  • in neutral thermal conditions

Lifting capacity in real conditions – factors

Please note that the working load will differ depending on the following factors, in order of importance:
  • Clearance – the presence of any layer (paint, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Alloy steels reduce magnetic permeability and holding force.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate decreases the lifting capacity.

Warnings
Dust explosion hazard

Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this risks ignition.

ICD Warning

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Respect the power

Use magnets with awareness. Their powerful strength can shock even professionals. Stay alert and respect their force.

Risk of cracking

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

Heat sensitivity

Watch the temperature. Heating the magnet to high heat will permanently weaken its magnetic structure and strength.

Threat to navigation

Navigation devices and smartphones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can permanently damage the sensors in your phone.

Serious injuries

Pinching hazard: The pulling power is so immense that it can result in hematomas, crushing, and even bone fractures. Use thick gloves.

Swallowing risk

These products are not toys. Accidental ingestion of multiple magnets may result in them pinching intestinal walls, which poses a severe health hazard and necessitates urgent medical intervention.

Data carriers

Very strong magnetic fields can erase data on credit cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Allergy Warning

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

Caution! Need more info? Read our article: Are neodymium magnets dangerous?