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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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Physical properties - 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

Engineering simulation of the magnet - data

Presented data constitute the direct effect of a physical simulation. Values are based on algorithms for the class Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Use these data as a reference point for designers.

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

Table 2: Sliding load (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: Vertical assembly (shearing) - behavior on slippery surfaces
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: Material efficiency (saturation) - power losses
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 resistance (stability) - 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) Shear 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 (implants) - 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
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: Dynamics (cracking risk) - 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 SI Unit / Description
Magnetic Flux 862 Mx 8.6 µWb
Pc Coefficient 0.83 High (Stable)

Table 11: Physics of underwater searching
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: 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

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

2. Plate thickness effect

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

3. Heat tolerance

*For N38 grade, the max working temp 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
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
Magnet pull force

Magnetic Field

Other proposals

The ring-shaped magnet 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 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 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. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.
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.
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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Strengths as well as weaknesses of neodymium magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose strength, even over around 10 years – the drop in strength is only ~1% (theoretically),
  • They have excellent resistance to magnetism drop as a result of opposing magnetic fields,
  • In other words, due to the smooth surface of nickel, the element gains a professional look,
  • Neodymium magnets achieve maximum magnetic induction on a contact point, which increases force concentration,
  • 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 individual machining and adapting to specific requirements,
  • Universal use in high-tech industry – they are commonly used in mass storage devices, electric motors, medical devices, also technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

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 decrease their power 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 durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in realizing threads and complex shapes in magnets, we recommend using cover - magnetic holder.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products can be problematic in diagnostics medical after entering the body.
  • Due to complex production process, their price is relatively high,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Magnet power was determined for ideal contact conditions, taking into account:
  • with the application of a sheet made of special test steel, guaranteeing maximum field concentration
  • whose transverse dimension equals approx. 10 mm
  • with an ground contact surface
  • under conditions of ideal adhesion (surface-to-surface)
  • under vertical force direction (90-degree angle)
  • at room temperature

Impact of factors on magnetic holding capacity in practice

Holding efficiency is affected by specific conditions, such as (from priority):
  • Air gap (between the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Angle of force application – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Higher carbon content reduce magnetic permeability and holding force.
  • Base smoothness – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Fragile material

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets leads to them breaking into shards.

Physical harm

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

Immense force

Exercise caution. Neodymium magnets attract from a distance and snap with massive power, often faster than you can move away.

Danger to the youngest

These products are not intended for children. Swallowing multiple magnets may result in them attracting across intestines, which poses a severe health hazard and requires immediate surgery.

Nickel allergy

A percentage of the population have a hypersensitivity to Ni, which is the common plating for neodymium magnets. Extended handling can result in a rash. We recommend use safety gloves.

Fire risk

Powder produced during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

GPS and phone interference

Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Health Danger

Medical warning: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Power loss in heat

Watch the temperature. Heating the magnet to high heat will destroy its properties and strength.

Threat to electronics

Equipment safety: Strong magnets can damage payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Important! Learn more about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98