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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

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0.824 ZŁ with VAT / pcs + price for transport

0.670 ZŁ net + 23% VAT / pcs

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Technical - 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

Physical modeling of the product - technical parameters

Presented values are the outcome of a engineering calculation. Results were calculated on models for the material Nd2Fe14B. Actual performance may differ. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - interaction chart
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
 safe
1 mm 2373 Gs
237.3 mT
 1.34 kg / 2.95 LBS
1338.1 g / 13.1 N
 safe
2 mm 1870 Gs
187.0 mT
 0.83 kg / 1.83 LBS
830.9 g / 8.2 N
 safe
3 mm 1416 Gs
141.6 mT
 0.48 kg / 1.05 LBS
476.6 g / 4.7 N
 safe
5 mm 785 Gs
78.5 mT
 0.15 kg / 0.32 LBS
146.4 g / 1.4 N
 safe
10 mm 214 Gs
21.4 mT
 0.01 kg / 0.02 LBS
10.9 g / 0.1 N
 safe
15 mm 81 Gs
8.1 mT
 0.00 kg / 0.00 LBS
1.6 g / 0.0 N
 safe
20 mm 38 Gs
3.8 mT
 0.00 kg / 0.00 LBS
0.3 g / 0.0 N
 safe
30 mm 12 Gs
1.2 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 safe
50 mm 3 Gs
0.3 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 safe
Pulling power drops sharply per each millimeter of distance. Note that even the smallest gap (e.g., dirt, paint, rust) significantly weakens the grip. Magnets hold optimally at the point of direct contact; distance weakens the power. Analyze how rapidly the load capacity plummet, when the magnet does not adhere flatly to the steel surface. When calculating the arrangement, discard redundant distances.

Table 2: Vertical capacity (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
This section indicates the approximate force sufficient to cause the slippage of the magnet downwards against a vertical metal surface (assuming standard friction). The holding force varies with the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - 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
When mounting a magnet on a vertical wall (e.g., a car body), it you can count on just about 20%-30% of nominal attraction strength. Gravity as well as a weak degree of grip influence the fact that magnets slip faster than they pop off the substrate. Designing a wall mount? Consider that the sliding force is noticeably lower than the perpendicular breakaway force. On a painted metal, the holder will give way down under a much lighter weight. Using a rubber pad can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - 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
A too thin steel is incapable of focus the full magnetic flux, which squanders power of the holder. Should you install a neodymium to a too thin substrate, the field will penetrate right through and the pull force will drop sharply. To achieve 100% of this magnet's potential, you require a sufficiently solid element of metal. The saturation phenomenon causes that on delicate walls (e.g., car bodies), the product shows lower pull force. We advise picking the steel dimension based on the following data.

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
Classic neodymiums lose parameters above the temperature limit. Avoid high temperatures – high temperature can irreversibly demagnetize this magnet. As the temperature rises, the magnet's capacity briefly drops. Refrain from using this product in hot environments higher than its operating temperature limit. Ignoring the limit will lead to irreversible degradation of magnetism.
*Technical advisory: Thermal stability is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) risk losing magnetic properties at lower temperatures compared to rod magnets. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 10x7/3.5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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
Two magnets attract each other from a wider radius than a neodymium and metal combination. The connection of two magnets creates a more powerful interaction and a further horizon of performance. Designing a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is huge. The repulsion force is a bit weaker than the attraction, but still impressive.
*Flux density for N-N configuration reaches ~0 Gs at the geometric center between the magnets (due to field cancellation).
Attention: Figures show sliding force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (electronics) - precautionary measures
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
Timepiece 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.0 cm
Remote 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
A strong magnetic field poses a real danger to IT equipment as well as pacemakers. These magnets produce a flux that destroys function of sensitive medical devices. Notice: the invisible magnetic field acts through matter and plastic. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (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
NdFeB products are delicate – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Striking energy can cause material chips or dangerous crushing to skin. Hold the magnet firmly during mounting so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the neodymium. Use safety goggles when working with powerful specimens.

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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical 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)
Flux value emitted by the magnet pole. Key data in coil applications as well as sensors. Pc value defines the working geometry.

Table 11: Hydrostatics and buoyancy
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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

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

2. Steel saturation

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

3. Heat tolerance

*For N38 material, the max working temp is 80°C.

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

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

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.

Technical specification and ecology
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%
Ecology and recycling (GPSR)
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
Measurement Calculator
Magnet pull force
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Insert a value in one of the inputs, to see the remaining fields convert in real-time.

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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. 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 10x7/3.5x3 / 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. 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 7/3.5 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.
This model is characterized by dimensions Ø10x3 mm and a weight of 1.55 g. The key parameter here is the lifting capacity amounting to approximately 1.88 kg (force ~18.47 N). The mounting hole diameter is precisely 7/3.5 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.

Strengths as well as weaknesses of rare earth magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • They do not lose their magnetic properties even under strong external field,
  • By covering with a reflective layer of nickel, the element gains an aesthetic look,
  • Magnets exhibit huge magnetic induction on the working surface,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of custom creating as well as optimizing to atypical applications,
  • Universal use in modern industrial fields – they serve a role in hard drives, brushless drives, diagnostic systems, also industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and 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
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing threads and complicated forms in magnets, we recommend using casing - magnetic mount.
  • Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small components of these products are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Highest magnetic holding force – what it depends on?

The force parameter is a result of laboratory testing executed under the following configuration:
  • with the contact of a yoke made of special test steel, guaranteeing full magnetic saturation
  • with a cross-section minimum 10 mm
  • with a surface free of scratches
  • under conditions of no distance (surface-to-surface)
  • during pulling in a direction vertical to the plane
  • at standard ambient temperature

Determinants of practical lifting force of a magnet

Please note that the working load will differ depending on elements below, in order of importance:
  • Distance (between the magnet and the plate), because even a very small clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of maximum force).
  • Plate thickness – insufficiently thick plate causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Steel grade – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Surface condition – ground elements guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
  • Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet and the plate reduces the load capacity.

Warnings
Dust explosion hazard

Drilling and cutting of neodymium magnets carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Fragile material

NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Clashing of two magnets will cause them cracking into small pieces.

Magnetic interference

GPS units and smartphones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.

No play value

Always keep magnets away from children. Ingestion danger is high, and the consequences of magnets clamping inside the body are life-threatening.

Finger safety

Large magnets can break fingers instantly. Under no circumstances place your hand betwixt two attracting surfaces.

Immense force

Before use, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Operating temperature

Do not overheat. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).

Protect data

Intense magnetic fields can erase data on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.

Health Danger

Patients with a heart stimulator must keep an absolute distance from magnets. The magnetic field can disrupt the operation of the implant.

Avoid contact if allergic

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, avoid touching magnets with bare hands and select coated magnets.

Warning! Want to know more? Read our article: Why are neodymium magnets dangerous?