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MP 15x7/3.5x5 / N38 - ring magnet

ring magnet

Catalog no 030390

GTIN/EAN: 5906301812302

5.00
Load capacity 5.09 kg / 49.95 N Magnetic Induction 343.70 mT / 3437 Gs
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
Coating
[NiCuNi] Nickel
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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical 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 - report

These information are the outcome of a engineering simulation. Results were calculated on models for the material Nd2Fe14B. Actual parameters might slightly differ. Treat these calculations as a reference point during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
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
 warning
1 mm 2736 Gs
273.6 mT
 4.09 kg / 9.01 lbs
4085.7 g / 40.1 N
 warning
2 mm 2372 Gs
237.2 mT
 3.07 kg / 6.77 lbs
3069.9 g / 30.1 N
 warning
3 mm 2007 Gs
200.7 mT
 2.20 kg / 4.84 lbs
2197.4 g / 21.6 N
 warning
5 mm 1377 Gs
137.7 mT
 1.03 kg / 2.28 lbs
1034.5 g / 10.1 N
 safe
10 mm 526 Gs
52.6 mT
 0.15 kg / 0.33 lbs
151.3 g / 1.5 N
 safe
15 mm 232 Gs
23.2 mT
 0.03 kg / 0.06 lbs
29.3 g / 0.3 N
 safe
20 mm 118 Gs
11.8 mT
 0.01 kg / 0.02 lbs
7.6 g / 0.1 N
 safe
30 mm 42 Gs
4.2 mT
 0.00 kg / 0.00 lbs
0.9 g / 0.0 N
 safe
50 mm 10 Gs
1.0 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 safe
Grip strength decreases significantly per each millimeter of distance. Keep in mind that every additional insulation layer (e.g., contamination, varnish, veneer) noticeably reduces the pull force. Magnetic products hold strongest during direct contact; gap weakens the force. Observe how rapidly the pull force plummet, when the magnet does not adhere flatly to the metal substrate. When calculating the mounting, avoid redundant distances.

Table 2: Slippage capacity (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 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 following data calculates the theoretical weight limit needed to cause the downward movement of the magnet downwards against a vertical steel wall (assuming standard friction). This value is relative to the separation distance between the magnet and the surface.

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 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 placing a magnet on a vertical plane (e.g., a board), it will maintain only about 1/5 of its maximum pull force. Gravitational force and a weak degree of grip cause that magnets move down easier than they pull off. Designing a hanger? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the element will slip down under a noticeably lighter load. Application of an anti-slip layer can significantly raise the stability.

Table 4: Material efficiency (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 sheet cannot focus the full magnetic flux, which wastes potential of the magnet. Should you attach a powerful product to a too thin substrate, the magnetism will penetrate right through and the holding will be smaller. To squeeze 100% of this magnet's potential, you need a suitably thick element of steel. The material oversaturation causes that on delicate walls (e.g., thin profiles), the magnet shows lower pull force. We recommend selecting the steel thickness according to the table below.

Table 5: Working in heat (material behavior) - power drop
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
Ordinary NdFeB products lose strength above the temperature limit. Avoid high temperatures – excessive heat can irreversibly demagnetize this magnet. With increasing heat, the magnet's force momentarily lowers. Avoid using this magnet in hot environments exceeding its safe range. Ignoring the limit will result in irreversible degradation of magnetic properties.
*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) may lose charge permanently under lower heat stress than taller cylinders. The danger warning in the table indicates 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 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 wider radius than a magnet and sheet combination. The setup of two magnets generates a stronger field and a wider radius of action. Planning to create a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when bringing together two magnets, the collision energy is huge. The levitation is marginally weaker than the connection force, but still significant.
*Field value between like poles is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Note: Estimates refer to sliding force of two same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (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
Mobile device 40 Gs (4.0 mT) 3.5 cm
Remote 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 large risk to electronic devices and pacemakers. These NdFeB products generate a flux that destroys function of sensitive medical devices. Be aware: the unseen radiation passes through tissues and housings. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.60 km/h
(7.11 m/s)
 0.16 J
30 mm 25.98 km/h
(7.22 m/s)
 0.16 J
50 mm 25.98 km/h
(7.22 m/s)
 0.16 J
100 mm 25.98 km/h
(7.22 m/s)
 0.16 J
NdFeB products are very brittle – a strong collision with metal causes immediate chipping. Control the attraction moment – a neodymium left loose becomes dangerous. Impact energy can cause material chips or dangerous crushing to skin. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A collision at high speed means shattering of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Coating parameters (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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Improper coating selection is the most common cause of magnet failure over time.

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. Key data when building generators and motors. Pc value defines the working geometry.

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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.

1. Vertical hold

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

2. Steel saturation

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

3. Power loss vs temp

*For N38 grade, 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.

Technical specification and ecology

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%

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: 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. Mounting is clean and reversible, unlike gluing. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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. This product is dedicated for inside building use. For outdoor applications, we recommend choosing magnets in hermetic housing or additional protection with varnish.
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.
The presented product is a ring magnet with dimensions Ø15 mm (outer diameter) and height 5 mm. The key parameter here is the lifting capacity amounting to approximately 5.09 kg (force ~49.95 N). 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. 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Strengths as well as weaknesses of rare earth magnets.

Benefits

Apart from their superior magnetic energy, neodymium magnets have these key benefits:
  • Their power is durable, and after approximately 10 years it decreases only by ~1% (according to research),
  • They do not lose their magnetic properties even under strong external field,
  • A magnet with a smooth silver surface has an effective appearance,
  • Neodymium magnets achieve maximum magnetic induction on a small surface, which increases force concentration,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • Thanks to the potential of flexible molding and customization to custom needs, NdFeB magnets can be created in a broad palette of shapes and sizes, which makes them more universal,
  • Key role in innovative solutions – they are commonly used in hard drives, electric motors, medical devices, and modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Limited possibility of producing nuts in the magnet and complex shapes - preferred is casing - mounting mechanism.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Furthermore, small elements of these magnets can complicate diagnosis medical when they are in the body.
  • Due to complex production process, their price is higher than average,

Lifting parameters

Highest magnetic holding force – what contributes to it?

The specified lifting capacity concerns the peak performance, recorded under optimal environment, namely:
  • on a block made of mild steel, optimally conducting the magnetic flux
  • with a cross-section no less than 10 mm
  • characterized by even structure
  • without the slightest air gap between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

In real-world applications, the actual lifting capacity results from several key aspects, listed from crucial:
  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Base massiveness – insufficiently thick steel does not accept the full field, causing part of the flux to be escaped into the air.
  • Material type – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was determined by applying a steel plate with a smooth surface of optimal 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 75%. Additionally, even a small distance between the magnet and the plate decreases the lifting capacity.

H&S for magnets
Mechanical processing

Machining of neodymium magnets carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Impact on smartphones

Note: neodymium magnets generate a field that confuses precision electronics. Keep a separation from your mobile, device, and navigation systems.

Electronic devices

Device Safety: Neodymium magnets can damage data carriers and sensitive devices (heart implants, hearing aids, timepieces).

Handling guide

Before use, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Do not overheat magnets

Watch the temperature. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Beware of splinters

Beware of splinters. Magnets can explode upon violent connection, ejecting shards into the air. Wear goggles.

Danger to pacemakers

Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Danger to the youngest

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

Bodily injuries

Risk of injury: The attraction force is so great that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.

Allergic reactions

Medical facts indicate that the nickel plating (the usual finish) is a common allergen. For allergy sufferers, prevent direct skin contact or opt for versions in plastic housing.

Caution! Details about risks in the article: Magnet Safety Guide.