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MP 15x7/3.5x3 / N38 - ring magnet

ring magnet

Catalog no 030182

GTIN/EAN: 5906301811992

5.00

Diameter

15 mm [±0,1 mm]

internal diameter Ø

7/3.5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

3.76 g

Magnetization Direction

↑ axial

Load capacity

2.71 kg / 26.61 N

Magnetic Induction

230.16 mT / 2302 Gs

Coating

[NiCuNi] Nickel

view parameters »

1.747 ZŁ with VAT / pcs + price for transport

1.420 ZŁ net + 23% VAT / pcs

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Detailed specification - MP 15x7/3.5x3 / N38 - ring magnet

Specification / characteristics - MP 15x7/3.5x3 / N38 - ring magnet

properties
properties values
Cat. no. 030182
GTIN/EAN 5906301811992
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 15 mm [±0,1 mm]
internal diameter Ø 7/3.5 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 3.76 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.71 kg / 26.61 N
Magnetic Induction ~ ? 230.16 mT / 2302 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 15x7/3.5x3 / 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 assembly - technical parameters

Presented values are the result of a engineering calculation. Values were calculated on models for the material Nd2Fe14B. Operational performance might slightly differ from theoretical values. Use these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
MP 15x7/3.5x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1995 Gs
199.5 mT
 2.71 kg / 5.97 pounds
2710.0 g / 26.6 N
 medium risk
1 mm 1833 Gs
183.3 mT
 2.29 kg / 5.05 pounds
2289.1 g / 22.5 N
 medium risk
2 mm 1618 Gs
161.8 mT
 1.78 kg / 3.93 pounds
1784.1 g / 17.5 N
 safe
3 mm 1385 Gs
138.5 mT
 1.31 kg / 2.88 pounds
1307.5 g / 12.8 N
 safe
5 mm 959 Gs
95.9 mT
 0.63 kg / 1.38 pounds
627.1 g / 6.2 N
 safe
10 mm 362 Gs
36.2 mT
 0.09 kg / 0.20 pounds
89.3 g / 0.9 N
 safe
15 mm 156 Gs
15.6 mT
 0.02 kg / 0.04 pounds
16.5 g / 0.2 N
 safe
20 mm 78 Gs
7.8 mT
 0.00 kg / 0.01 pounds
4.1 g / 0.0 N
 safe
30 mm 27 Gs
2.7 mT
 0.00 kg / 0.00 pounds
0.5 g / 0.0 N
 safe
50 mm 6 Gs
0.6 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
Pulling power drops significantly with every subsequent millimeter of gap. Remember that even a very thin break (e.g., dirt, paint, dust) strongly weakens the grip. Magnets operate most effectively during direct contact; distance weakens the power. Analyze how quickly the parameters fall, when the product does not touch directly to the metal substrate. When planning the mounting, avoid additional spacers.

Table 2: Slippage capacity (vertical surface)
MP 15x7/3.5x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.54 kg / 1.19 pounds
542.0 g / 5.3 N
1 mm Stal (~0.2) 0.46 kg / 1.01 pounds
458.0 g / 4.5 N
2 mm Stal (~0.2) 0.36 kg / 0.78 pounds
356.0 g / 3.5 N
3 mm Stal (~0.2) 0.26 kg / 0.58 pounds
262.0 g / 2.6 N
5 mm Stal (~0.2) 0.13 kg / 0.28 pounds
126.0 g / 1.2 N
10 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below calculates the approximate weight limit sufficient to start the slippage of the magnet downwards on a vertical steel plate (assuming typical friction). This value varies with the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MP 15x7/3.5x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.81 kg / 1.79 pounds
813.0 g / 8.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.54 kg / 1.19 pounds
542.0 g / 5.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.27 kg / 0.60 pounds
271.0 g / 2.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.36 kg / 2.99 pounds
1355.0 g / 13.3 N
When mounting a magnet on a upright wall (e.g., a fridge), it will maintain only about 20%-30% of its nominal power. Gravitational force and a low friction coefficient mean that products slip faster than they detach. Want to create a hanger? Remember that the sliding force is noticeably lower than the maximum static pull force. On a slippery surface, the element will slip down under a noticeably lighter cargo. Application of an anti-slip layer can effectively increase the grip.

Table 4: Steel thickness (substrate influence) - power losses
MP 15x7/3.5x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.27 kg / 0.60 pounds
271.0 g / 2.7 N
1 mm
25%
 0.68 kg / 1.49 pounds
677.5 g / 6.6 N
2 mm
50%
 1.36 kg / 2.99 pounds
1355.0 g / 13.3 N
3 mm
75%
 2.03 kg / 4.48 pounds
2032.5 g / 19.9 N
5 mm
100%
 2.71 kg / 5.97 pounds
2710.0 g / 26.6 N
10 mm
100%
 2.71 kg / 5.97 pounds
2710.0 g / 26.6 N
11 mm
100%
 2.71 kg / 5.97 pounds
2710.0 g / 26.6 N
12 mm
100%
 2.71 kg / 5.97 pounds
2710.0 g / 26.6 N
A thin metal plate is incapable of conduct the entire magnetic field, which wastes potential of the magnet. Should you mount a strong magnet to a thin surface, the field will pass right through and the holding will be smaller. To squeeze 100% of this magnet's power, you require a sufficiently solid backing of steel. The material oversaturation causes that on delicate walls (e.g., car bodies), the holder shows lower pull force. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal stability (material behavior) - resistance threshold
MP 15x7/3.5x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.71 kg / 5.97 pounds
2710.0 g / 26.6 N
 OK
40 °C -2.2% 2.65 kg / 5.84 pounds
2650.4 g / 26.0 N
 OK
60 °C -4.4% 2.59 kg / 5.71 pounds
2590.8 g / 25.4 N
80 °C -6.6% 2.53 kg / 5.58 pounds
2531.1 g / 24.8 N
100 °C -28.8% 1.93 kg / 4.25 pounds
1929.5 g / 18.9 N
Classic neodymiums lose strength past the thermal threshold. Avoid high temperatures – high temperature can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's power momentarily decreases. Avoid using this product near heat sources exceeding its working range. Ignoring the limit will result in destruction of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 15x7/3.5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.48 kg / 7.68 pounds
3 483 Gs
0.52 kg / 1.15 pounds
523 g / 5.1 N
 N/A
1 mm 3.24 kg / 7.14 pounds
3 846 Gs
0.49 kg / 1.07 pounds
486 g / 4.8 N
 2.91 kg / 6.43 pounds
~0 Gs
2 mm 2.94 kg / 6.49 pounds
3 666 Gs
0.44 kg / 0.97 pounds
441 g / 4.3 N
 2.65 kg / 5.84 pounds
~0 Gs
3 mm 2.62 kg / 5.78 pounds
3 460 Gs
0.39 kg / 0.87 pounds
393 g / 3.9 N
 2.36 kg / 5.20 pounds
~0 Gs
5 mm 1.98 kg / 4.36 pounds
3 004 Gs
0.30 kg / 0.65 pounds
296 g / 2.9 N
 1.78 kg / 3.92 pounds
~0 Gs
10 mm 0.81 kg / 1.78 pounds
1 919 Gs
0.12 kg / 0.27 pounds
121 g / 1.2 N
 0.73 kg / 1.60 pounds
~0 Gs
20 mm 0.11 kg / 0.25 pounds
724 Gs
0.02 kg / 0.04 pounds
17 g / 0.2 N
 0.10 kg / 0.23 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
88 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
54 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
35 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
24 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
17 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
13 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets attract each other from a much further distance than a neodymium and metal combination. The connection of magnet-to-magnet produces a massive flux and a larger range of performance. Designing a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Remember that when attracting two neodymiums, the impact force is extreme. The repulsion force is marginally weaker than the connection force, but still impressive.
*The magnetic induction for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Attention: Estimates demonstrate friction force of dual same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - warnings
MP 15x7/3.5x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.5 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Timepiece 20 Gs (2.0 mT) 3.5 cm
Mobile device 40 Gs (4.0 mT) 3.0 cm
Remote 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field is a real danger to electronic devices as well as pacemakers. These magnets produce a flux that disrupts operation of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - collision effects
MP 15x7/3.5x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.63 km/h
(7.67 m/s)
 0.11 J
30 mm 46.90 km/h
(13.03 m/s)
 0.32 J
50 mm 60.54 km/h
(16.82 m/s)
 0.53 J
100 mm 85.62 km/h
(23.78 m/s)
 1.06 J
Neodymium magnets are very brittle – a collision with steel can result in shattering. Control the attraction moment – a neodymium left loose speeds with massive force. Impact energy can trigger coating fragments or injury to skin. Hold the magnet firmly during mounting so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when playing with powerful specimens.

Table 9: Corrosion resistance
MP 15x7/3.5x3 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Flux)
MP 15x7/3.5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 461 Mx 34.6 µWb
Pc Coefficient 0.26 Low (Flat)
Flux value emitted by the pole surface. Key data in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MP 15x7/3.5x3 / N38

Environment Effective steel pull Effect
Air (land) 2.71 kg Standard
Water (riverbed) 3.10 kg
(+0.39 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Warning: On a vertical wall, the magnet retains only ~20% of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) severely reduces 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) = 0.26

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: 030182-2026
Measurement Calculator
Force (pull)
Magnetic Field
Type data in a box, and the remaining fields convert on the fly.

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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 quick installation to wood, wall, plastic, or metal. This product with a force of 2.71 kg works great as a cabinet closure, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 15x7/3.5x3 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a flexible washer under the screw head, which will cushion the stresses. 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 indoor 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. 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.
The presented product is a ring magnet with dimensions Ø15 mm (outer diameter) and height 3 mm. The key parameter here is the lifting capacity amounting to approximately 2.71 kg (force ~26.61 N). The mounting hole diameter is precisely 7/3.5 mm.
The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages as well as disadvantages of neodymium magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • By applying a shiny coating of gold, the element presents an modern look,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of individual shaping as well as optimizing to atypical conditions,
  • Significant place in future technologies – they find application in HDD drives, motor assemblies, diagnostic systems, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in compact constructions

Weaknesses

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these products are able to be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Detachment force of the magnet in optimal conditions – what affects it?

The force parameter is a theoretical maximum value conducted under specific, ideal conditions:
  • with the application of a yoke made of special test steel, ensuring maximum field concentration
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with an polished touching surface
  • without any clearance between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Key elements affecting lifting force

Bear in mind that the working load will differ depending on the following factors, in order of importance:
  • Distance (between the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
  • Direction of force – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel type – mild steel attracts best. Alloy admixtures reduce magnetic permeability and holding force.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Temperature – heating the magnet causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as 75%. In addition, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

H&S for magnets
Permanent damage

Keep cool. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Do not give to children

NdFeB magnets are not toys. Swallowing multiple magnets can lead to them connecting inside the digestive tract, which constitutes a direct threat to life and requires urgent medical intervention.

Bodily injuries

Big blocks can break fingers in a fraction of a second. Never place your hand between two attracting surfaces.

Respect the power

Handle with care. Rare earth magnets act from a distance and snap with huge force, often faster than you can react.

Fire risk

Dust produced during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Allergic reactions

Nickel alert: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, immediately stop working with magnets and wear gloves.

Keep away from computers

Data protection: Strong magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Danger to pacemakers

Warning for patients: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or ask another person to handle the magnets.

GPS Danger

An intense magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Maintain magnets near a device to avoid damaging the sensors.

Material brittleness

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

Caution! More info about risks in the article: Safety of working with magnets.