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

ring magnet

Catalog no 030202

GTIN/EAN: 5906301812197

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 of the product - MP 5x2.7/1.2x5 S / N38 - ring magnet

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

properties
properties values
Cat. no. 030202
GTIN/EAN 5906301812197
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 S / 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 analysis of the product - data

These data are the direct effect of a engineering simulation. Values are based on algorithms for the class Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Use these data as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - characteristics
MP 5x2.7/1.2x5 S / 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
safe
1 mm 3295 Gs
329.5 mT
0.29 kg / 0.63 lbs
287.5 g / 2.8 N
safe
2 mm 1883 Gs
188.3 mT
0.09 kg / 0.21 lbs
93.9 g / 0.9 N
safe
3 mm 1098 Gs
109.8 mT
0.03 kg / 0.07 lbs
31.9 g / 0.3 N
safe
5 mm 440 Gs
44.0 mT
0.01 kg / 0.01 lbs
5.1 g / 0.1 N
safe
10 mm 92 Gs
9.2 mT
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
safe
15 mm 33 Gs
3.3 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe
20 mm 15 Gs
1.5 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe
30 mm 5 Gs
0.5 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe
50 mm 1 Gs
0.1 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe

Table 2: Slippage capacity (vertical surface)
MP 5x2.7/1.2x5 S / 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

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 5x2.7/1.2x5 S / 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

Table 4: Material efficiency (substrate influence) - power losses
MP 5x2.7/1.2x5 S / 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

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

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 5x2.7/1.2x5 S / 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 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

Table 7: Protective zones (electronics) - precautionary measures
MP 5x2.7/1.2x5 S / 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
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: Dynamics (cracking risk) - collision effects
MP 5x2.7/1.2x5 S / 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: Corrosion resistance
MP 5x2.7/1.2x5 S / 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: Construction data (Pc)
MP 5x2.7/1.2x5 S / N38

Parameter Value SI Unit / Description
Magnetic Flux 862 Mx 8.6 µWb
Pc Coefficient 0.83 High (Stable)

Table 11: Hydrostatics and buoyancy
MP 5x2.7/1.2x5 S / 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!
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet holds only ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically limits the holding force.

3. Heat tolerance

*For standard magnets, 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.

Engineering data and GPSR
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%
Environmental data
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: 030202-2026
Quick Unit Converter
Force (pull)

Magnetic Field

Other offers

The ring-shaped magnet MP 5x2.7/1.2x5 S / N38 is created for permanent mounting, 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. 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 S / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. 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.
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.
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. Aesthetic mounting requires selecting the appropriate head size.
It is a magnetic ring with a diameter of 5 mm and thickness 5 mm. The key parameter here is the lifting capacity amounting to approximately 0.75 kg (force ~7.31 N). 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.

Advantages as well as disadvantages of rare earth magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They have stable power, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
  • They have excellent resistance to weakening of magnetic properties when exposed to external magnetic sources,
  • In other words, due to the glossy layer of gold, the element gains visual value,
  • They show high magnetic induction at the operating surface, making them more effective,
  • 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...
  • Thanks to freedom in designing and the ability to customize to client solutions,
  • Fundamental importance in future technologies – they are commonly used in magnetic memories, motor assemblies, precision medical tools, as well as industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Weaknesses

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in producing nuts and complicated forms in magnets, we propose using cover - magnetic mechanism.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Additionally, small components of these devices are able to complicate diagnosis medical when they are in the body.
  • Due to neodymium price, their price is relatively high,

Pull force analysis

Magnetic strength at its maximum – what it depends on?

Breakaway force was defined for ideal contact conditions, taking into account:
  • with the application of a sheet made of low-carbon steel, ensuring maximum field concentration
  • with a thickness of at least 10 mm
  • with a plane perfectly flat
  • with direct contact (without paint)
  • during pulling in a direction vertical to the mounting surface
  • at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

Real force is affected by working environment parameters, including (from priority):
  • Distance (betwixt the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick steel does not accept the full field, causing part of the power to be wasted to the other side.
  • Material type – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
  • Surface finish – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal environment – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was determined with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, whereas under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Eye protection

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets will cause them breaking into shards.

Bone fractures

Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

Do not give to children

Strictly store magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are fatal.

Threat to electronics

Powerful magnetic fields can destroy records on payment cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.

Handling guide

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Pacemakers

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Magnetic interference

A strong magnetic field disrupts the operation of magnetometers in smartphones and GPS navigation. Keep magnets close to a smartphone to avoid damaging the sensors.

Thermal limits

Avoid heat. Neodymium magnets are sensitive to heat. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

Fire warning

Powder produced during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Allergy Warning

Some people have a hypersensitivity to nickel, which is the common plating for NdFeB magnets. Prolonged contact may cause a rash. We recommend wear safety gloves.

Security! Learn more about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98