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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 details »

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Product card - 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 simulation of the assembly - data

These values represent the direct effect of a engineering calculation. Results were calculated on algorithms for the material Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Use these data as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - 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 LBS
5090.0 g / 49.9 N
 medium risk
1 mm 2736 Gs
273.6 mT
 4.09 kg / 9.01 LBS
4085.7 g / 40.1 N
 medium risk
2 mm 2372 Gs
237.2 mT
 3.07 kg / 6.77 LBS
3069.9 g / 30.1 N
 medium risk
3 mm 2007 Gs
200.7 mT
 2.20 kg / 4.84 LBS
2197.4 g / 21.6 N
 medium risk
5 mm 1377 Gs
137.7 mT
 1.03 kg / 2.28 LBS
1034.5 g / 10.1 N
 weak grip
10 mm 526 Gs
52.6 mT
 0.15 kg / 0.33 LBS
151.3 g / 1.5 N
 weak grip
15 mm 232 Gs
23.2 mT
 0.03 kg / 0.06 LBS
29.3 g / 0.3 N
 weak grip
20 mm 118 Gs
11.8 mT
 0.01 kg / 0.02 LBS
7.6 g / 0.1 N
 weak grip
30 mm 42 Gs
4.2 mT
 0.00 kg / 0.00 LBS
0.9 g / 0.0 N
 weak grip
50 mm 10 Gs
1.0 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 weak grip
Pulling power weakens drastically with every mm of gap. Note that even a very thin break (e.g., contamination, paint, veneer) significantly reduces the pull force. Neodymiums hold optimally during direct contact; distance drastically cuts the force. See how flashily the pull force fall, when the magnet does not adhere flatly to the steel surface. When planning the mounting, discard unnecessary gaps.

Table 2: Shear capacity (wall)
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 LBS
1018.0 g / 10.0 N
1 mm Stal (~0.2) 0.82 kg / 1.80 LBS
818.0 g / 8.0 N
2 mm Stal (~0.2) 0.61 kg / 1.35 LBS
614.0 g / 6.0 N
3 mm Stal (~0.2) 0.44 kg / 0.97 LBS
440.0 g / 4.3 N
5 mm Stal (~0.2) 0.21 kg / 0.45 LBS
206.0 g / 2.0 N
10 mm Stal (~0.2) 0.03 kg / 0.07 LBS
30.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 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
The table below indicates the theoretical force sufficient to start the sliding of the magnet downwards against a vertical steel wall (assuming typical friction). This parameter is relative to the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - 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 LBS
1527.0 g / 15.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.02 kg / 2.24 LBS
1018.0 g / 10.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.51 kg / 1.12 LBS
509.0 g / 5.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.55 kg / 5.61 LBS
2545.0 g / 25.0 N
When mounting a holder on a vertical plane (e.g., a fridge), it will only hold barely approx. 1/5 of nominal attraction strength. Gravity as well as a weak degree of grip influence the fact that magnets slip faster than they pull off. Designing a vertical fastening? Note that the shear force is much weaker than the maximum static pull force. On a painted metal, the magnet will give way down under a much lighter weight. Application of an anti-slip coating can significantly increase the grip.

Table 4: Steel thickness (substrate influence) - power losses
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 LBS
509.0 g / 5.0 N
1 mm
25%
 1.27 kg / 2.81 LBS
1272.5 g / 12.5 N
2 mm
50%
 2.55 kg / 5.61 LBS
2545.0 g / 25.0 N
3 mm
75%
 3.82 kg / 8.42 LBS
3817.5 g / 37.4 N
5 mm
100%
 5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
10 mm
100%
 5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
11 mm
100%
 5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
12 mm
100%
 5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
A thin metal plate is incapable of take in the entire magnetic field, which weakens actual performance of the magnet. Should you mount a strong magnet to a thin surface, the field will penetrate right through and the holding will be smaller. To squeeze full efficiency of this magnet's power, you require a sufficiently solid element of steel. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the holder holds weaker. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal stability (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 LBS
5090.0 g / 49.9 N
 OK
40 °C -2.2% 4.98 kg / 10.97 LBS
4978.0 g / 48.8 N
 OK
60 °C -4.4% 4.87 kg / 10.73 LBS
4866.0 g / 47.7 N
80 °C -6.6% 4.75 kg / 10.48 LBS
4754.1 g / 46.6 N
100 °C -28.8% 3.62 kg / 7.99 LBS
3624.1 g / 35.6 N
Classic neodymiums lose strength above the temperature limit. Protect against heat – excessive heat can irreversibly destroy this product. With increasing heat, the magnet's capacity momentarily drops. Refrain from using this magnet in hot environments higher than its working range. Ignoring the limit will result in destruction of magnetic properties.
*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Low-profile magnets (pancake types) are more susceptible to demagnetization under lower heat stress compared to rod magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
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 LBS
4 643 Gs
1.22 kg / 2.70 LBS
1225 g / 12.0 N
 N/A
1 mm 7.39 kg / 16.29 LBS
5 810 Gs
1.11 kg / 2.44 LBS
1108 g / 10.9 N
 6.65 kg / 14.66 LBS
~0 Gs
2 mm 6.55 kg / 14.45 LBS
5 472 Gs
0.98 kg / 2.17 LBS
983 g / 9.6 N
 5.90 kg / 13.01 LBS
~0 Gs
3 mm 5.72 kg / 12.62 LBS
5 113 Gs
0.86 kg / 1.89 LBS
858 g / 8.4 N
 5.15 kg / 11.35 LBS
~0 Gs
5 mm 4.19 kg / 9.23 LBS
4 374 Gs
0.63 kg / 1.38 LBS
628 g / 6.2 N
 3.77 kg / 8.31 LBS
~0 Gs
10 mm 1.66 kg / 3.66 LBS
2 753 Gs
0.25 kg / 0.55 LBS
249 g / 2.4 N
 1.49 kg / 3.29 LBS
~0 Gs
20 mm 0.24 kg / 0.54 LBS
1 053 Gs
0.04 kg / 0.08 LBS
36 g / 0.4 N
 0.22 kg / 0.48 LBS
~0 Gs
50 mm 0.00 kg / 0.01 LBS
134 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
83 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
55 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
38 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
27 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
20 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnetic products interact from a much further distance than a magnet and sheet setup. The setup of two magnets produces a massive flux and a further horizon of performance. Planning to create a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Remember that when bringing together two magnets, the collision energy is massive. The repulsion force is slightly lower than the connection force, but still large.
*Field value in repulsion mode reaches ~0 Gs at the midpoint of the gap (due to field cancellation).
Important: Estimates refer to shear force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - 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
Mechanical watch 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
Powerful magnet radiation poses a serious hazard to electronic devices as well as medical implants. These magnets produce a field that destroys function of sensitive medical devices. Notice: the invisible magnetic field penetrates the body and housings. Special caution must be exercised by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
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
Neodymium magnets are very brittle – a strong collision with metal can result in shattering. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Kinetic force can destroy the magnet or painful pinches to fingers. Hold the magnet firmly during installation so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear safety glasses when handling with large magnets.

Table 9: Corrosion resistance
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 following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
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 magnet pole. Key data for generator designers and motors. Pc value 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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Sliding resistance

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

2. Plate thickness effect

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

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.39

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.

Technical and environmental data
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%
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: 030390-2026
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The ring-shaped magnet MP 15x7/3.5x5 / N38 is created for permanent mounting, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables quick installation 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 15x7/3.5x5 / 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 rubber spacer 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. 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. 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 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.
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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages and disadvantages of Nd2Fe14B magnets.

Benefits

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They retain full power for almost 10 years – the drop is just ~1% (in theory),
  • Neodymium magnets are distinguished by extremely resistant to magnetic field loss caused by magnetic disturbances,
  • In other words, due to the shiny surface of nickel, the element becomes visually attractive,
  • Magnets are distinguished by exceptionally strong magnetic induction on the working surface,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to versatility in forming and the ability to customize to specific needs,
  • Wide application in future technologies – they serve a role in mass storage devices, motor assemblies, precision medical tools, also other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of making nuts in the magnet and complex shapes - preferred is casing - magnetic holder.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child safety. Furthermore, tiny parts of these products can be problematic in diagnostics medical when they are in the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Breakaway force was determined for the most favorable conditions, assuming:
  • on a base made of structural steel, optimally conducting the magnetic flux
  • whose thickness equals approx. 10 mm
  • with a surface perfectly flat
  • with total lack of distance (no paint)
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

Key elements affecting lifting force

Real force impacted by working environment parameters, mainly (from most important):
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Warnings
Operating temperature

Avoid heat. Neodymium magnets are sensitive to heat. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Respect the power

Handle magnets consciously. Their powerful strength can shock even professionals. Be vigilant and respect their force.

Life threat

Patients with a pacemaker should maintain an absolute distance from magnets. The magnetism can interfere with the operation of the implant.

Bodily injuries

Risk of injury: The pulling power is so immense that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.

Allergy Warning

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If an allergic reaction happens, cease handling magnets and wear gloves.

Magnet fragility

NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets will cause them cracking into shards.

Impact on smartphones

A powerful magnetic field negatively affects the operation of compasses in phones and navigation systems. Keep magnets close to a device to prevent damaging the sensors.

Cards and drives

Device Safety: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, hearing aids, timepieces).

Do not drill into magnets

Combustion risk: Rare earth powder is explosive. Avoid machining magnets in home conditions as this may cause fire.

Product not for children

These products are not suitable for play. Eating multiple magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and requires immediate surgery.

Caution! Looking for details? Check our post: Are neodymium magnets dangerous?