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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 parameters - 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 modeling of the product - data

These information are the result of a mathematical calculation. Values are based on models for the class Nd2Fe14B. Actual performance might slightly differ from theoretical values. Use these data as a reference point during assembly planning.

Table 1: Static pull force (force vs distance) - power drop
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 lbs
750.0 g / 7.4 N
low risk
1 mm 3295 Gs
329.5 mT
0.29 kg / 0.63 lbs
287.5 g / 2.8 N
low risk
2 mm 1883 Gs
188.3 mT
0.09 kg / 0.21 lbs
93.9 g / 0.9 N
low risk
3 mm 1098 Gs
109.8 mT
0.03 kg / 0.07 lbs
31.9 g / 0.3 N
low risk
5 mm 440 Gs
44.0 mT
0.01 kg / 0.01 lbs
5.1 g / 0.1 N
low risk
10 mm 92 Gs
9.2 mT
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
low risk
15 mm 33 Gs
3.3 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk
20 mm 15 Gs
1.5 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk
30 mm 5 Gs
0.5 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk
50 mm 1 Gs
0.1 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk

Table 2: Sliding capacity (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 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: Wall mounting (sliding) - vertical pull
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 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: Steel thickness (saturation) - sheet metal selection
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 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: 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 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: Two magnets (repulsion) - field range
MP 5x2.7/1.2x5 C / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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: Hazards (electronics) - warnings
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
Phone / Smartphone 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 (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: 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)

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)

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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Sliding resistance

*Note: On a vertical wall, the magnet holds just ~20% of its nominal pull.

2. Steel saturation

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

3. Temperature resistance

*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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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
Material specification
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
Magnet Unit Converter
Force (pull)

Field Strength

Other proposals

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 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 C / 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. 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.
The inner hole diameter determines the maximum size of the mounting element. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. 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 key parameter here is the holding force amounting to approximately 0.75 kg (force ~7.31 N). The mounting hole diameter is precisely 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 and disadvantages of Nd2Fe14B magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (according to literature),
  • They are extremely resistant to demagnetization induced by external field influence,
  • A magnet with a smooth nickel surface has better aesthetics,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of individual shaping and adjusting to individual conditions,
  • Fundamental importance in future technologies – they are utilized in computer drives, electric drive systems, medical devices, and technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing threads and complex forms in magnets, we recommend using casing - magnetic mount.
  • Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets can complicate diagnosis 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

Holding force characteristics

Highest magnetic holding forcewhat affects it?

The specified lifting capacity represents the limit force, measured under ideal test conditions, namely:
  • using a plate made of low-carbon steel, acting as a magnetic yoke
  • with a thickness no less than 10 mm
  • with a plane perfectly flat
  • under conditions of ideal adhesion (metal-to-metal)
  • under axial force vector (90-degree angle)
  • in stable room temperature

What influences lifting capacity in practice

It is worth knowing that the application force may be lower influenced by elements below, starting with the most relevant:
  • Distance (between the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to varnish, rust or dirt).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Surface condition – ground elements guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
  • Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was determined with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
Allergic reactions

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop handling magnets and wear gloves.

ICD Warning

Individuals with a heart stimulator must maintain an safe separation from magnets. The magnetic field can interfere with the functioning of the implant.

Keep away from children

Strictly store magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are very dangerous.

Flammability

Combustion risk: Rare earth powder is explosive. Do not process magnets without safety gear as this may cause fire.

Power loss in heat

Watch the temperature. Heating the magnet to high heat will ruin its properties and pulling force.

Serious injuries

Risk of injury: The pulling power is so immense that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.

Protect data

Powerful magnetic fields can destroy records on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.

Magnetic interference

Note: rare earth magnets produce a field that disrupts precision electronics. Keep a safe distance from your phone, device, and navigation systems.

Protective goggles

Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Conscious usage

Exercise caution. Neodymium magnets attract from a long distance and connect with huge force, often faster than you can move away.

Warning! More info about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98