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MP 10x7/3.5x3 / N38 - ring magnet

ring magnet

Catalog no 030180

GTIN/EAN: 5906301811978

5.00

Diameter

10 mm [±0,1 mm]

internal diameter Ø

7/3.5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

1.55 g

Magnetization Direction

↑ axial

Load capacity

1.88 kg / 18.47 N

Magnetic Induction

318.70 mT / 3187 Gs

Coating

[NiCuNi] Nickel

0.824 with VAT / pcs + price for transport

0.670 ZŁ net + 23% VAT / pcs

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Technical of the product - MP 10x7/3.5x3 / N38 - ring magnet

Specification / characteristics - MP 10x7/3.5x3 / N38 - ring magnet

properties
properties values
Cat. no. 030180
GTIN/EAN 5906301811978
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 10 mm [±0,1 mm]
internal diameter Ø 7/3.5 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 1.55 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.88 kg / 18.47 N
Magnetic Induction ~ ? 318.70 mT / 3187 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 10x7/3.5x3 / 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 modeling of the magnet - report

These information represent the direct effect of a physical simulation. Results rely on algorithms for the class Nd2Fe14B. Operational parameters might slightly differ. Use these data as a reference point when designing systems.

Table 1: Static force (pull vs distance) - power drop
MP 10x7/3.5x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2813 Gs
281.3 mT
1.88 kg / 4.14 lbs
1880.0 g / 18.4 N
weak grip
1 mm 2373 Gs
237.3 mT
1.34 kg / 2.95 lbs
1338.1 g / 13.1 N
weak grip
2 mm 1870 Gs
187.0 mT
0.83 kg / 1.83 lbs
830.9 g / 8.2 N
weak grip
3 mm 1416 Gs
141.6 mT
0.48 kg / 1.05 lbs
476.6 g / 4.7 N
weak grip
5 mm 785 Gs
78.5 mT
0.15 kg / 0.32 lbs
146.4 g / 1.4 N
weak grip
10 mm 214 Gs
21.4 mT
0.01 kg / 0.02 lbs
10.9 g / 0.1 N
weak grip
15 mm 81 Gs
8.1 mT
0.00 kg / 0.00 lbs
1.6 g / 0.0 N
weak grip
20 mm 38 Gs
3.8 mT
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
weak grip
30 mm 12 Gs
1.2 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
weak grip
50 mm 3 Gs
0.3 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
weak grip

Table 2: Vertical load (wall)
MP 10x7/3.5x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.38 kg / 0.83 lbs
376.0 g / 3.7 N
1 mm Stal (~0.2) 0.27 kg / 0.59 lbs
268.0 g / 2.6 N
2 mm Stal (~0.2) 0.17 kg / 0.37 lbs
166.0 g / 1.6 N
3 mm Stal (~0.2) 0.10 kg / 0.21 lbs
96.0 g / 0.9 N
5 mm Stal (~0.2) 0.03 kg / 0.07 lbs
30.0 g / 0.3 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 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) - vertical pull
MP 10x7/3.5x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.56 kg / 1.24 lbs
564.0 g / 5.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.38 kg / 0.83 lbs
376.0 g / 3.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.19 kg / 0.41 lbs
188.0 g / 1.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.94 kg / 2.07 lbs
940.0 g / 9.2 N

Table 4: Material efficiency (saturation) - sheet metal selection
MP 10x7/3.5x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.19 kg / 0.41 lbs
188.0 g / 1.8 N
1 mm
25%
0.47 kg / 1.04 lbs
470.0 g / 4.6 N
2 mm
50%
0.94 kg / 2.07 lbs
940.0 g / 9.2 N
3 mm
75%
1.41 kg / 3.11 lbs
1410.0 g / 13.8 N
5 mm
100%
1.88 kg / 4.14 lbs
1880.0 g / 18.4 N
10 mm
100%
1.88 kg / 4.14 lbs
1880.0 g / 18.4 N
11 mm
100%
1.88 kg / 4.14 lbs
1880.0 g / 18.4 N
12 mm
100%
1.88 kg / 4.14 lbs
1880.0 g / 18.4 N

Table 5: Thermal resistance (material behavior) - thermal limit
MP 10x7/3.5x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.88 kg / 4.14 lbs
1880.0 g / 18.4 N
OK
40 °C -2.2% 1.84 kg / 4.05 lbs
1838.6 g / 18.0 N
OK
60 °C -4.4% 1.80 kg / 3.96 lbs
1797.3 g / 17.6 N
80 °C -6.6% 1.76 kg / 3.87 lbs
1755.9 g / 17.2 N
100 °C -28.8% 1.34 kg / 2.95 lbs
1338.6 g / 13.1 N

Table 6: Two magnets (attraction) - field collision
MP 10x7/3.5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.86 kg / 6.30 lbs
4 419 Gs
0.43 kg / 0.95 lbs
429 g / 4.2 N
N/A
1 mm 2.46 kg / 5.43 lbs
5 224 Gs
0.37 kg / 0.81 lbs
370 g / 3.6 N
2.22 kg / 4.89 lbs
~0 Gs
2 mm 2.03 kg / 4.49 lbs
4 747 Gs
0.31 kg / 0.67 lbs
305 g / 3.0 N
1.83 kg / 4.04 lbs
~0 Gs
3 mm 1.62 kg / 3.58 lbs
4 242 Gs
0.24 kg / 0.54 lbs
244 g / 2.4 N
1.46 kg / 3.22 lbs
~0 Gs
5 mm 0.96 kg / 2.12 lbs
3 266 Gs
0.14 kg / 0.32 lbs
144 g / 1.4 N
0.87 kg / 1.91 lbs
~0 Gs
10 mm 0.22 kg / 0.49 lbs
1 570 Gs
0.03 kg / 0.07 lbs
33 g / 0.3 N
0.20 kg / 0.44 lbs
~0 Gs
20 mm 0.02 kg / 0.04 lbs
429 Gs
0.00 kg / 0.01 lbs
2 g / 0.0 N
0.01 kg / 0.03 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
41 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
25 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
16 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
11 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
8 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
6 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Protective zones (implants) - warnings
MP 10x7/3.5x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.5 cm
Hearing aid 10 Gs (1.0 mT) 3.5 cm
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Mobile device 40 Gs (4.0 mT) 2.0 cm
Car key 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (kinetic energy) - collision effects
MP 10x7/3.5x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 35.25 km/h
(9.79 m/s)
0.07 J
30 mm 60.84 km/h
(16.90 m/s)
0.22 J
50 mm 78.54 km/h
(21.82 m/s)
0.37 J
100 mm 111.07 km/h
(30.85 m/s)
0.74 J

Table 9: Corrosion resistance
MP 10x7/3.5x3 / 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 10x7/3.5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 899 Mx 19.0 µWb
Pc Coefficient 0.37 Low (Flat)

Table 11: Underwater work (magnet fishing)
MP 10x7/3.5x3 / N38

Environment Effective steel pull Effect
Air (land) 1.88 kg Standard
Water (riverbed) 2.15 kg
(+0.27 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Note: On a vertical wall, the magnet retains merely approx. 20-30% of its max power.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely reduces the holding force.

3. Power loss vs temp

*For standard magnets, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.37

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
Chemical composition
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: 030180-2026
Quick Unit Converter
Pulling force

Magnetic Field

Other proposals

The ring-shaped magnet MP 10x7/3.5x3 / 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 material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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. This product is dedicated for inside building use. For outdoor applications, we recommend choosing magnets in hermetic housing or additional protection with varnish.
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. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø10 mm (outer diameter) and height 3 mm. The key parameter here is the holding force amounting to approximately 1.88 kg (force ~18.47 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 7/3.5 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros and cons of rare earth magnets.

Pros

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:
  • They do not lose power, even during around ten years – the decrease in strength is only ~1% (theoretically),
  • They have excellent resistance to weakening of magnetic properties when exposed to external magnetic sources,
  • Thanks to the shimmering finish, the coating of Ni-Cu-Ni, gold, or silver-plated gives an visually attractive appearance,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
  • Thanks to modularity in shaping and the capacity to modify to individual projects,
  • Wide application in electronics industry – they are utilized in hard drives, electric motors, advanced medical instruments, as well as complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited ability of producing nuts in the magnet and complicated forms - recommended is a housing - mounting mechanism.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • Due to expensive raw materials, their price is higher than average,

Lifting parameters

Maximum magnetic pulling forcewhat it depends on?

The force parameter is a result of laboratory testing performed under specific, ideal conditions:
  • on a base made of mild steel, effectively closing the magnetic flux
  • whose thickness is min. 10 mm
  • with an ground touching surface
  • without the slightest clearance between the magnet and steel
  • during detachment in a direction vertical to the plane
  • at temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Real force is influenced by working environment parameters, mainly (from most important):
  • Distance (between the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Plate material – mild steel attracts best. Alloy steels decrease magnetic permeability and holding force.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was determined with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate reduces the load capacity.

Warnings
Product not for children

Absolutely store magnets out of reach of children. Choking hazard is significant, and the consequences of magnets connecting inside the body are tragic.

Pacemakers

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

Fragile material

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets will cause them shattering into small pieces.

Hand protection

Mind your fingers. Two powerful magnets will join immediately with a force of massive weight, crushing everything in their path. Be careful!

Operating temperature

Regular neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. This process is irreversible.

GPS and phone interference

Navigation devices and mobile phones are highly sensitive to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Keep away from computers

Data protection: Strong magnets can damage data carriers and delicate electronics (heart implants, medical aids, mechanical watches).

Allergy Warning

Medical facts indicate that the nickel plating (the usual finish) is a common allergen. For allergy sufferers, refrain from touching magnets with bare hands and choose versions in plastic housing.

Conscious usage

Handle magnets with awareness. Their immense force can surprise even experienced users. Plan your moves and respect their force.

Dust is flammable

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

Danger! Details 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