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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

0.836 with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

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Technical data - 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 analysis of the magnet - technical parameters

These values are the direct effect of a mathematical analysis. Results were calculated on algorithms for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Please consider these data as a preliminary roadmap during assembly planning.

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

Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 5322 Gs
532.2 mT
0.75 kg / 750.0 g
7.4 N
safe
1 mm 3295 Gs
329.5 mT
0.29 kg / 287.5 g
2.8 N
safe
2 mm 1883 Gs
188.3 mT
0.09 kg / 93.9 g
0.9 N
safe
3 mm 1098 Gs
109.8 mT
0.03 kg / 31.9 g
0.3 N
safe
5 mm 440 Gs
44.0 mT
0.01 kg / 5.1 g
0.1 N
safe
10 mm 92 Gs
9.2 mT
0.00 kg / 0.2 g
0.0 N
safe
15 mm 33 Gs
3.3 mT
0.00 kg / 0.0 g
0.0 N
safe
20 mm 15 Gs
1.5 mT
0.00 kg / 0.0 g
0.0 N
safe
30 mm 5 Gs
0.5 mT
0.00 kg / 0.0 g
0.0 N
safe
50 mm 1 Gs
0.1 mT
0.00 kg / 0.0 g
0.0 N
safe

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

Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 0.15 kg / 150.0 g
1.5 N
1 mm Stal (~0.2) 0.06 kg / 58.0 g
0.6 N
2 mm Stal (~0.2) 0.02 kg / 18.0 g
0.2 N
3 mm Stal (~0.2) 0.01 kg / 6.0 g
0.1 N
5 mm Stal (~0.2) 0.00 kg / 2.0 g
0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N

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

Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.22 kg / 225.0 g
2.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.15 kg / 150.0 g
1.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.08 kg / 75.0 g
0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.38 kg / 375.0 g
3.7 N

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 5x2.7/1.2x5 C / N38

Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.08 kg / 75.0 g
0.7 N
1 mm
25%
0.19 kg / 187.5 g
1.8 N
2 mm
50%
0.38 kg / 375.0 g
3.7 N
5 mm
100%
0.75 kg / 750.0 g
7.4 N
10 mm
100%
0.75 kg / 750.0 g
7.4 N

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

Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 0.75 kg / 750.0 g
7.4 N
OK
40 °C -2.2% 0.73 kg / 733.5 g
7.2 N
OK
60 °C -4.4% 0.72 kg / 717.0 g
7.0 N
OK
80 °C -6.6% 0.70 kg / 700.5 g
6.9 N
100 °C -28.8% 0.53 kg / 534.0 g
5.2 N

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

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 2.75 kg / 2747 g
26.9 N
5 924 Gs
N/A
1 mm 1.77 kg / 1768 g
17.3 N
8 541 Gs
1.59 kg / 1592 g
15.6 N
~0 Gs
2 mm 1.05 kg / 1053 g
10.3 N
6 590 Gs
0.95 kg / 948 g
9.3 N
~0 Gs
3 mm 0.60 kg / 604 g
5.9 N
4 992 Gs
0.54 kg / 544 g
5.3 N
~0 Gs
5 mm 0.20 kg / 198 g
1.9 N
2 860 Gs
0.18 kg / 178 g
1.8 N
~0 Gs
10 mm 0.02 kg / 19 g
0.2 N
880 Gs
0.02 kg / 17 g
0.2 N
~0 Gs
20 mm 0.00 kg / 1 g
0.0 N
184 Gs
0.00 kg / 0 g
0.0 N
~0 Gs
50 mm 0.00 kg / 0 g
0.0 N
16 Gs
0.00 kg / 0 g
0.0 N
~0 Gs

Table 7: Hazards (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
Timepiece 20 Gs (2.0 mT) 2.0 cm
Mobile device 40 Gs (4.0 mT) 1.5 cm
Car key 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

Table 8: Impact energy (kinetic energy) - 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

Table 9: Coating parameters (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)

Table 10: Electrical 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)

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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

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

2. Efficiency vs thickness

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

3. Thermal stability

*For N38 grade, the critical 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.

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%
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: 030201-2025
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Force (pull)

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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. 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 5x2.7/1.2x5 C / 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 flexible washer 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. If you must use it outside, paint it with anti-corrosion paint after mounting.
The inner hole diameter determines the maximum size of the mounting element. 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 Ø5 mm (outer diameter) and height 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.

Pros and cons of rare earth magnets.

Pros

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They retain magnetic properties for around ten years – the loss is just ~1% (in theory),
  • Neodymium magnets prove to be highly resistant to loss of magnetic properties caused by magnetic disturbances,
  • By covering with a reflective layer of silver, the element presents an modern look,
  • Neodymium magnets ensure maximum magnetic induction on a contact point, which allows for strong attraction,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise machining and adapting to complex requirements,
  • Key role in electronics industry – they serve a role in HDD drives, electric motors, advanced medical instruments, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in small systems

Disadvantages

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of producing nuts in the magnet and complex forms - preferred is casing - magnetic holder.
  • Health risk resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. Furthermore, tiny parts of these products are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum holding power of the magnet – what affects it?

The declared magnet strength represents the maximum value, obtained under ideal test conditions, namely:
  • on a plate made of structural steel, perfectly concentrating the magnetic field
  • with a cross-section of at least 10 mm
  • with an ground contact surface
  • under conditions of ideal adhesion (surface-to-surface)
  • during pulling in a direction vertical to the plane
  • at ambient temperature room level

Determinants of practical lifting force of a magnet

In real-world applications, the real power is determined by many variables, listed from the most important:
  • Distance (between the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Angle of force application – highest force is available only during perpendicular pulling. The shear force of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick plate does not close the flux, causing part of the flux to be escaped into the air.
  • Plate material – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and lifting capacity.
  • Surface structure – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Danger to pacemakers

Warning for patients: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Nickel allergy

Certain individuals experience a contact allergy to nickel, which is the common plating for NdFeB magnets. Extended handling can result in an allergic reaction. We suggest wear protective gloves.

GPS Danger

A powerful magnetic field disrupts the operation of magnetometers in smartphones and GPS navigation. Do not bring magnets close to a device to avoid damaging the sensors.

Danger to the youngest

Adult use only. Small elements pose a choking risk, causing serious injuries. Keep out of reach of kids and pets.

Magnet fragility

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Machining danger

Powder generated during machining of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Operating temperature

Do not overheat. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Crushing force

Watch your fingers. Two powerful magnets will snap together immediately with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Keep away from computers

Data protection: Neodymium magnets can damage payment cards and sensitive devices (heart implants, medical aids, timepieces).

Caution required

Before starting, check safety instructions. Sudden snapping can break the magnet or injure your hand. Be predictive.

Danger! Details about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98