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MP 15x7/3.5x5 / N38 - ring magnet

ring magnet

Catalog no 030390

GTIN/EAN: 5906301812302

5.00

Diameter

15 mm [±0,1 mm]

internal diameter Ø

7/3.5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

6.27 g

Magnetization Direction

↑ axial

Load capacity

5.09 kg / 49.95 N

Magnetic Induction

343.70 mT / 3437 Gs

Coating

[NiCuNi] Nickel

technical specifications »

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Technical parameters of the product - MP 15x7/3.5x5 / N38 - ring magnet

Specification / characteristics - MP 15x7/3.5x5 / N38 - ring magnet

properties
properties values
Cat. no. 030390
GTIN/EAN 5906301812302
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 5 mm [±0,1 mm]
Weight 6.27 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.09 kg / 49.95 N
Magnetic Induction ~ ? 343.70 mT / 3437 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 15x7/3.5x5 / 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 modeling of the product - technical parameters

These values represent the outcome of a engineering simulation. Values rely on models for the class Nd2Fe14B. Actual performance may differ from theoretical values. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs distance) - interaction chart
MP 15x7/3.5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3054 Gs
305.4 mT
 5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
 warning
1 mm 2736 Gs
273.6 mT
 4.09 kg / 9.01 pounds
4085.7 g / 40.1 N
 warning
2 mm 2372 Gs
237.2 mT
 3.07 kg / 6.77 pounds
3069.9 g / 30.1 N
 warning
3 mm 2007 Gs
200.7 mT
 2.20 kg / 4.84 pounds
2197.4 g / 21.6 N
 warning
5 mm 1377 Gs
137.7 mT
 1.03 kg / 2.28 pounds
1034.5 g / 10.1 N
 weak grip
10 mm 526 Gs
52.6 mT
 0.15 kg / 0.33 pounds
151.3 g / 1.5 N
 weak grip
15 mm 232 Gs
23.2 mT
 0.03 kg / 0.06 pounds
29.3 g / 0.3 N
 weak grip
20 mm 118 Gs
11.8 mT
 0.01 kg / 0.02 pounds
7.6 g / 0.1 N
 weak grip
30 mm 42 Gs
4.2 mT
 0.00 kg / 0.00 pounds
0.9 g / 0.0 N
 weak grip
50 mm 10 Gs
1.0 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 weak grip
Grip strength drops significantly with every mm of gap. Remember that even a microscopic distance (e.g., dirt, paint, veneer) noticeably reduces the pull force. Magnets hold most effectively in perfect adhesion; distance weakens the power. Notice how flashily the parameters plummet, when the magnet does not adhere directly to the metal substrate. When calculating the mounting, eliminate unnecessary gaps.

Table 2: Slippage load (vertical surface)
MP 15x7/3.5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.02 kg / 2.24 pounds
1018.0 g / 10.0 N
1 mm Stal (~0.2) 0.82 kg / 1.80 pounds
818.0 g / 8.0 N
2 mm Stal (~0.2) 0.61 kg / 1.35 pounds
614.0 g / 6.0 N
3 mm Stal (~0.2) 0.44 kg / 0.97 pounds
440.0 g / 4.3 N
5 mm Stal (~0.2) 0.21 kg / 0.45 pounds
206.0 g / 2.0 N
10 mm Stal (~0.2) 0.03 kg / 0.07 pounds
30.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 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 following data indicates the approximate holding capacity needed to cause the shifting of the magnet downwards against a upright steel plate (assuming typical friction coefficient). This value is a function of the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 15x7/3.5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.53 kg / 3.37 pounds
1527.0 g / 15.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.02 kg / 2.24 pounds
1018.0 g / 10.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.51 kg / 1.12 pounds
509.0 g / 5.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.55 kg / 5.61 pounds
2545.0 g / 25.0 N
When placing a element on a upright surface (e.g., a fridge), it will maintain just about 1/5 of its nominal power. Gravitational force as well as a low friction coefficient cause that products move down easier than they pop off the substrate. Planning a hanger? Consider that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will slip down under a significantly smaller weight. Utilizing a rubberized pad can significantly increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MP 15x7/3.5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.51 kg / 1.12 pounds
509.0 g / 5.0 N
1 mm
25%
 1.27 kg / 2.81 pounds
1272.5 g / 12.5 N
2 mm
50%
 2.55 kg / 5.61 pounds
2545.0 g / 25.0 N
3 mm
75%
 3.82 kg / 8.42 pounds
3817.5 g / 37.4 N
5 mm
100%
 5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
10 mm
100%
 5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
11 mm
100%
 5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
12 mm
100%
 5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
A thin sheet is incapable of focus the entire magnetic field, which squanders power of the magnet. If you mount a strong magnet to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To utilize 100% of this neodymium's potential, you need a suitably thick backing of metal. The saturation phenomenon causes that on sheet metal structures (e.g., appliance housings), the magnet works worse. We advise picking the steel dimension according to the table below.

Table 5: Working in heat (material behavior) - resistance threshold
MP 15x7/3.5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 5.09 kg / 11.22 pounds
5090.0 g / 49.9 N
 OK
40 °C -2.2% 4.98 kg / 10.97 pounds
4978.0 g / 48.8 N
 OK
60 °C -4.4% 4.87 kg / 10.73 pounds
4866.0 g / 47.7 N
80 °C -6.6% 4.75 kg / 10.48 pounds
4754.1 g / 46.6 N
100 °C -28.8% 3.62 kg / 7.99 pounds
3624.1 g / 35.6 N
Classic neodymiums irreversibly lose parameters after exceeding the maximum temperature. Protect against heat – excessive heat can permanently destroy this magnet. With increasing heat, the neodymium's capacity temporarily decreases. Refrain from using this magnet close to heaters exceeding its operating temperature limit. Too high temperature will lead to permanent loss of magnetism.
*Engineering note: Temperature resistance is determined by both grade, as well as the dimension ratios. Flat magnets (pancake types) are more susceptible to demagnetization under lower heat stress compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MP 15x7/3.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 8.17 kg / 18.00 pounds
4 643 Gs
1.22 kg / 2.70 pounds
1225 g / 12.0 N
 N/A
1 mm 7.39 kg / 16.29 pounds
5 810 Gs
1.11 kg / 2.44 pounds
1108 g / 10.9 N
 6.65 kg / 14.66 pounds
~0 Gs
2 mm 6.55 kg / 14.45 pounds
5 472 Gs
0.98 kg / 2.17 pounds
983 g / 9.6 N
 5.90 kg / 13.01 pounds
~0 Gs
3 mm 5.72 kg / 12.62 pounds
5 113 Gs
0.86 kg / 1.89 pounds
858 g / 8.4 N
 5.15 kg / 11.35 pounds
~0 Gs
5 mm 4.19 kg / 9.23 pounds
4 374 Gs
0.63 kg / 1.38 pounds
628 g / 6.2 N
 3.77 kg / 8.31 pounds
~0 Gs
10 mm 1.66 kg / 3.66 pounds
2 753 Gs
0.25 kg / 0.55 pounds
249 g / 2.4 N
 1.49 kg / 3.29 pounds
~0 Gs
20 mm 0.24 kg / 0.54 pounds
1 053 Gs
0.04 kg / 0.08 pounds
36 g / 0.4 N
 0.22 kg / 0.48 pounds
~0 Gs
50 mm 0.00 kg / 0.01 pounds
134 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
83 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
55 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
38 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
27 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
20 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 significantly greater distance than a magnet and steel combination. The setup of two magnets generates a stronger field and a wider radius of performance. Planning to create a powerful holder? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the impact force is extreme. The levitation is a bit weaker than the connection force, but still large.
*Flux density in repulsion mode is approximately ~0 Gs at the geometric center between the magnets (due to field cancellation).
Note: Figures demonstrate friction force of dual identical magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - warnings
MP 15x7/3.5x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Timepiece 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field poses a real danger to electronics and medical implants. These neodymiums generate a flux that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field acts through matter and plastic. Special caution must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MP 15x7/3.5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 29.26 km/h
(8.13 m/s)
 0.21 J
30 mm 49.78 km/h
(13.83 m/s)
 0.60 J
50 mm 64.25 km/h
(17.85 m/s)
 1.00 J
100 mm 90.87 km/h
(25.24 m/s)
 2.00 J
Magnetic elements are very brittle – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or painful pinches to fingers. Hold the magnet firmly during mounting so it doesn't hit with great force against the metal. A collision at high speed almost guarantees destruction of the neodymium. Use safety goggles when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MP 15x7/3.5x5 / 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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MP 15x7/3.5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 791 Mx 47.9 µWb
Pc Coefficient 0.39 Low (Flat)
Total magnetic flux passing through the pole surface. Essential parameter in coil applications and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Physics of underwater searching
MP 15x7/3.5x5 / N38

Environment Effective steel pull Effect
Air (land) 5.09 kg Standard
Water (riverbed) 5.83 kg
(+0.74 kg buoyancy gain)
+14.5%
Warning: 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Caution: On a vertical wall, the magnet retains just approx. 20-30% of its perpendicular strength.

2. Efficiency vs thickness

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

3. Thermal stability

*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) = 0.39

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%
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: 030390-2026
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Pulling force
Field Strength
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The ring-shaped magnet MP 15x7/3.5x5 / 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 5.09 kg works great as a cabinet closure, speaker holder, or spacer element in devices.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. 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.
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.
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. Always check that the screw head is not larger than the outer diameter of the magnet (15 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 15 mm and thickness 5 mm. The pulling force of this model is an impressive 5.09 kg, which translates to 49.95 N in newtons. 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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages as well as disadvantages of neodymium magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even over approximately 10 years – the decrease in strength is only ~1% (theoretically),
  • Neodymium magnets are distinguished by highly resistant to loss of magnetic properties caused by magnetic disturbances,
  • Thanks to the elegant finish, the surface of nickel, gold-plated, or silver-plated gives an visually attractive appearance,
  • Magnetic induction on the working layer of the magnet turns out to be impressive,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Possibility of detailed forming and optimizing to atypical conditions,
  • Significant place in future technologies – they are used in mass storage devices, drive modules, diagnostic systems, as well as multitasking production systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Limitations

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • At very strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • We suggest cover - magnetic mount, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these products are able to be problematic in diagnostics medical in case of swallowing.
  • 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

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what it depends on?

Breakaway force is the result of a measurement for the most favorable conditions, including:
  • on a plate made of structural steel, optimally conducting the magnetic flux
  • whose thickness reaches at least 10 mm
  • characterized by smoothness
  • under conditions of no distance (metal-to-metal)
  • under vertical force direction (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Holding efficiency is affected by working environment parameters, such as (from priority):
  • Air gap (betwixt the magnet and the plate), since even a tiny distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate reduces the lifting capacity.

Precautions when working with neodymium magnets
No play value

Absolutely store magnets away from children. Choking hazard is significant, and the consequences of magnets connecting inside the body are very dangerous.

Material brittleness

NdFeB magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets will cause them cracking into shards.

Crushing force

Big blocks can crush fingers in a fraction of a second. Never put your hand between two strong magnets.

Powerful field

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

Cards and drives

Very strong magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Magnetic interference

Remember: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a separation from your phone, tablet, and GPS.

Sensitization to coating

A percentage of the population have a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause an allergic reaction. We suggest use protective gloves.

Medical implants

Individuals with a heart stimulator have to keep an safe separation from magnets. The magnetic field can interfere with the functioning of the implant.

Heat warning

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

Do not drill into magnets

Drilling and cutting of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Important! Details about risks in the article: Safety of working with magnets.