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neodymium magnets

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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

Technical simulation of the product - technical parameters

Presented data constitute the result of a physical analysis. Values rely on algorithms for the class NdFeB. Actual performance might slightly differ. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (force 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: Shear 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) - 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 (saturation) - power losses
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 collision
MP 5x2.7/1.2x5 C / N38
Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 0.76 kg / 756 g
7.4 N
10 688 Gs
N/A
1 mm 0.29 kg / 287 g
2.8 N
8 541 Gs
0.26 kg / 259 g
2.5 N
~0 Gs
2 mm 0.09 kg / 94 g
0.9 N
6 590 Gs
0.08 kg / 85 g
0.8 N
~0 Gs
3 mm 0.03 kg / 32 g
0.3 N
4 992 Gs
0.03 kg / 29 g
0.3 N
~0 Gs
5 mm 0.01 kg / 5 g
0.1 N
2 860 Gs
0.00 kg / 0 g
0.0 N
~0 Gs
10 mm 0.00 kg / 0 g
0.0 N
880 Gs
0.00 kg / 0 g
0.0 N
~0 Gs
20 mm 0.00 kg / 0 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: Protective zones (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
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 (Pc)
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: Hydrostatics and buoyancy
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Szybki Konwerter Jednostek
Siła (Udźwig)

Pole Magnetyczne

Other deals

The ring-shaped magnet MP 5x2.7/1.2x5 C / N38 is created for permanent mounting, where glue might fail or be insufficient. 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 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. 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.
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.
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 and disadvantages of rare earth magnets.

Apart from their consistent power, neodymium magnets have these key benefits:

  • They have stable power, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
  • Magnets very well resist against loss of magnetization caused by external fields,
  • In other words, due to the reflective surface of silver, the element is aesthetically pleasing,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which allows for strong attraction,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
  • In view of the ability of accurate shaping and adaptation to specialized requirements, neodymium magnets can be produced in a broad palette of geometric configurations, which amplifies use scope,
  • Universal use in advanced technology sectors – they are utilized in HDD drives, brushless drives, medical devices, also other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their power 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
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complex shapes.
  • Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these magnets can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

The specified lifting capacity represents the limit force, measured under optimal environment, namely:

  • using a plate made of mild steel, acting as a magnetic yoke
  • with a cross-section of at least 10 mm
  • characterized by lack of roughness
  • with zero gap (no paint)
  • during detachment in a direction vertical to the mounting surface
  • at conditions approx. 20°C

Key elements affecting lifting force

In practice, the real power depends on a number of factors, presented from crucial:

  • Clearance – the presence of any layer (paint, tape, gap) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Load vector – highest force is available only during perpendicular pulling. The shear force of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Steel grade – the best choice is pure iron steel. Hardened steels may generate lower lifting capacity.
  • Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a small distance {between} the magnet and the plate decreases the lifting capacity.

H&S for magnets

Protective goggles

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Impact of two magnets leads to them breaking into small pieces.

Implant safety

Individuals with a pacemaker have to maintain an large gap from magnets. The magnetic field can interfere with the operation of the implant.

Keep away from computers

Do not bring magnets close to a purse, laptop, or TV. The magnetism can permanently damage these devices and wipe information from cards.

Avoid contact if allergic

Certain individuals suffer from a contact allergy to nickel, which is the standard coating for NdFeB magnets. Frequent touching may cause a rash. We strongly advise use safety gloves.

Do not give to children

Neodymium magnets are not toys. Swallowing several magnets may result in them connecting inside the digestive tract, which constitutes a severe health hazard and requires immediate surgery.

Safe operation

Exercise caution. Rare earth magnets attract from a long distance and snap with huge force, often faster than you can react.

Do not overheat magnets

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Crushing risk

Danger of trauma: The attraction force is so immense that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Keep away from electronics

Navigation devices and smartphones are extremely sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.

Flammability

Machining of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Warning!

Learn more 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