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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

see technical specifications »

1.747 ZŁ with VAT / pcs + price for transport

1.420 ZŁ net + 23% VAT / pcs

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Product card - 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

Technical analysis of the magnet - technical parameters

These values constitute the direct effect of a engineering calculation. Values are based on models for the material Nd2Fe14B. Operational parameters may differ from theoretical values. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs distance) - characteristics
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
 warning
1 mm 1833 Gs
183.3 mT
 2.29 kg / 5.05 pounds
2289.1 g / 22.5 N
 warning
2 mm 1618 Gs
161.8 mT
 1.78 kg / 3.93 pounds
1784.1 g / 17.5 N
 low risk
3 mm 1385 Gs
138.5 mT
 1.31 kg / 2.88 pounds
1307.5 g / 12.8 N
 low risk
5 mm 959 Gs
95.9 mT
 0.63 kg / 1.38 pounds
627.1 g / 6.2 N
 low risk
10 mm 362 Gs
36.2 mT
 0.09 kg / 0.20 pounds
89.3 g / 0.9 N
 low risk
15 mm 156 Gs
15.6 mT
 0.02 kg / 0.04 pounds
16.5 g / 0.2 N
 low risk
20 mm 78 Gs
7.8 mT
 0.00 kg / 0.01 pounds
4.1 g / 0.0 N
 low risk
30 mm 27 Gs
2.7 mT
 0.00 kg / 0.00 pounds
0.5 g / 0.0 N
 low risk
50 mm 6 Gs
0.6 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Magnetic force drops drastically per each millimeter of distance. Keep in mind that even a microscopic distance (e.g., contamination, varnish, veneer) noticeably weakens the grip. Neodymiums work optimally during direct contact; distance kills the power. See how rapidly the load capacity plummet, when the product does not touch tightly to the steel surface. When designing the mounting, eliminate additional spacers.

Table 2: Slippage hold (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
This section calculates the approximate weight limit required to cause the sliding of the magnet downwards on a vertical steel wall (considering standard friction). This parameter is a function of the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 placing a holder on a upright wall (e.g., a fridge), it you can count on only about 1/5 of its nominal power. Gravitational force as well as a low friction coefficient influence the fact that magnets slide down faster than they pop off the substrate. Planning a hanger? Consider that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the magnet will slip down under a noticeably lighter cargo. Utilizing a rubberized layer can drastically increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
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 sheet is unable to absorb the entire magnetic field, which wastes potential of the holder. Should you mount a strong magnet to a too thin substrate, the flux will penetrate right through and the attraction force will be weaker. To squeeze full efficiency of this neodymium's power, you require a sufficiently solid element of metal. The material oversaturation means that on delicate walls (e.g., thin profiles), the magnet holds weaker. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal resistance (stability) - power drop
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 irreversibly lose strength above the temperature limit. Protect against heat – high temperature can permanently demagnetize this product. As the temperature rises, the magnet's force momentarily drops. Refrain from using this magnet close to heaters exceeding its working range. Exceeding the critical threshold will lead to permanent loss of magnetism.
*Technical advisory: Heat tolerance is determined by both grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table points to permanent field degradation for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 magnetic products interact from a significantly greater distance than a magnet and steel combination. The setup of two magnets produces a massive flux and a larger range of performance. Designing a solid fastener? Apply two magnets instead of a neodymium and a steel. Remember that when connecting a pair of magnets, the impact force is huge. The levitation is a bit weaker than the attraction, but still impressive.
*The magnetic induction between like poles is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
Note: Figures show friction force of a pair of identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - 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
Mechanical watch 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 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
A strong magnetic field is a serious hazard to electronics and pacemakers. These neodymiums generate a flux that destroys function of digital equipment. Be aware: the invisible magnetic field penetrates the body and housings. Special caution must be taken by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, remotes, membranes, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
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
Magnetic elements are prone to chipping – a violent impact against metal risks their cracking. Control the attraction moment – a neodymium left loose turns into a projectile. Kinetic force can cause material chips or dangerous crushing to skin. Be sure to control the product during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

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 passing through the pole surface. Key data for generator designers as well as sensors. Pc value determines the magnet's operating point.

Table 11: Physics of underwater searching
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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds just approx. 20-30% of its nominal pull.

2. Steel thickness impact

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

3. Power loss vs temp

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26

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%
Environmental data
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
Quick Unit Converter
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The ring-shaped magnet MP 15x7/3.5x3 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 2.71 kg works great as a cabinet closure, speaker holder, or spacer 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 very brittle 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. 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.
A screw or bolt with a thread diameter smaller than 7/3.5 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 15 mm and thickness 3 mm. The pulling force of this model is an impressive 2.71 kg, which translates to 26.61 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 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. 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.

Strengths

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • Neodymium magnets prove to be extremely resistant to loss of magnetic properties caused by magnetic disturbances,
  • By covering with a shiny coating of nickel, the element presents an aesthetic look,
  • The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
  • Possibility of detailed shaping as well as optimizing to complex requirements,
  • Universal use in advanced technology sectors – they are utilized in hard drives, brushless drives, medical devices, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in small systems

Limitations

Cons of neodymium magnets: tips and applications.
  • At 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.
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited ability of making nuts in the magnet and complicated shapes - recommended is cover - mounting mechanism.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets are able to complicate diagnosis 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 hinders application in large quantities

Pull force analysis

Highest magnetic holding force – what it depends on?

The specified lifting capacity concerns the peak performance, recorded under laboratory conditions, meaning:
  • with the contact of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • whose thickness reaches at least 10 mm
  • with an ground contact surface
  • under conditions of ideal adhesion (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • at room temperature

Lifting capacity in practice – influencing factors

In practice, the actual holding force depends on several key aspects, ranked from most significant:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Steel type – mild steel attracts best. Alloy admixtures lower magnetic permeability and lifting capacity.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity was determined by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Bone fractures

Mind your fingers. Two powerful magnets will snap together instantly with a force of massive weight, destroying everything in their path. Be careful!

Keep away from children

Only for adults. Tiny parts can be swallowed, causing intestinal necrosis. Store away from children and animals.

Protect data

Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can permanently damage these devices and erase data from cards.

Sensitization to coating

Certain individuals suffer from a hypersensitivity to Ni, which is the standard coating for NdFeB magnets. Extended handling may cause skin redness. We strongly advise use protective gloves.

Thermal limits

Regular neodymium magnets (N-type) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Beware of splinters

Beware of splinters. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. We recommend safety glasses.

Magnetic interference

A powerful magnetic field interferes with the operation of magnetometers in smartphones and GPS navigation. Maintain magnets near a smartphone to prevent breaking the sensors.

Medical implants

For implant holders: Powerful magnets affect medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.

Fire warning

Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Powerful field

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Safety First! Want to know more? Read our article: Are neodymium magnets dangerous?