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neodymium magnets

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Where to purchase powerful neodymium magnet? Magnet holders in airtight and durable steel enclosure are excellent for use in difficult, demanding weather conditions, including during snow and rain read

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

ring magnet

Catalog no 030201

GTIN: 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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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 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 T
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 106 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Engineering simulation of the product - technical parameters

The following data are the direct effect of a engineering calculation. Results are based on models for the material NdFeB. Real-world parameters may deviate from the simulation results. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
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: Sliding Hold (Wall)
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) - vertical pull
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: Thermal resistance (stability) - power drop
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: Two magnets (attraction) - forces in the system
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: 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
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
Table 8: Collisions (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
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 (Flux)
MP 5x2.7/1.2x5 C / N38
Parameter Value Jedn. SI / Opis
Strumień (Flux) 862 Mx 8.6 µWb
Współczynnik Pc 0.83 Wysoki (Stabilny)
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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Montaż na Ścianie (Ześlizg)

*Uwaga: Na pionowej ścianie magnes utrzyma tylko ok. 20-30% tego co na suficie.

2. Wpływ Grubości Blachy

*Cienka blacha (np. obudowa PC 0.5mm) drastycznie osłabia magnes.

3. Wytrzymałość Temperaturowa

*Dla materiału N38 granica bezpieczeństwa to 80°C.

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Osoby z rozrusznikiem muszą zachować dystans min. 10 cm.

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Ryzyko połknięcia. Połknięcie dwóch magnesów grozi śmiercią.

Kruchy materiał

Magnes to ceramika! Uderzenie o inny magnes spowoduje odpryski.

Do czego użyć tego magnesu?

Sprawdzone zastosowania dla wymiaru 15x10x2 mm

Elektronika i Czujniki

Idealny jako element wyzwalający dla czujników Halla oraz kontaktronów w systemach alarmowych. Płaski kształt (2mm) pozwala na ukrycie go w wąskich szczelinach obudowy.

Modelarstwo i Druk 3D

Stosowany do tworzenia niewidocznych zamknięć w modelach drukowanych 3D. Można go wprasować w wydruk lub wkleić w kieszeń zaprojektowaną w modelu CAD.

Meble i Fronty

Używany jako "domykacz" lekkich drzwiczek szafkowych, gdzie standardowe magnesy meblowe są za grube. Wymaga wklejenia w płytkie podfrezowanie.

Other deals

The ring magnet with a hole MP 5x2.7/1.2x5 C / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. This product with a force of 0.75 kg works great as a door latch, speaker holder, or spacer element in devices.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain great sensitivity. 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.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. 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.
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.
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 neodymium magnets.

Besides their durability, 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% (according to literature),
  • They possess excellent resistance to weakening of magnetic properties as a result of opposing magnetic fields,
  • The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnets have maximum magnetic induction on the active area,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to flexibility in forming and the ability to modify to specific needs,
  • Significant place in future technologies – they are commonly used in computer drives, drive modules, medical equipment, and modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose their strength 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 durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in realizing nuts and complex forms in magnets, we recommend using a housing - magnetic holder.
  • Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these products are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Best holding force of the magnet in ideal parameterswhat it depends on?

Magnet power is the result of a measurement for ideal contact conditions, assuming:

  • with the application of a yoke made of special test steel, guaranteeing maximum field concentration
  • whose transverse dimension equals approx. 10 mm
  • with a surface free of scratches
  • under conditions of gap-free contact (surface-to-surface)
  • under vertical force vector (90-degree angle)
  • at standard ambient temperature

What influences lifting capacity in practice

It is worth knowing that the magnet holding may be lower depending on the following factors, in order of importance:

  • Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Steel grade – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Surface structure – the more even the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets

Shattering risk

Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Power loss in heat

Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.

This is not a toy

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

Compass and GPS

An intense magnetic field interferes with the functioning of compasses in phones and GPS navigation. Keep magnets close to a device to avoid damaging the sensors.

Bodily injuries

Protect your hands. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Be careful!

Dust explosion hazard

Fire warning: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Avoid contact if allergic

A percentage of the population experience a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause dermatitis. We recommend wear protective gloves.

Health Danger

For implant holders: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Threat to electronics

Device Safety: Strong magnets can damage data carriers and sensitive devices (heart implants, hearing aids, timepieces).

Powerful field

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

Safety First!

Want to know more? Check our post: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98