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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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Physical properties - 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 magnet - data

Presented values constitute the direct effect of a physical analysis. Results are based on algorithms for the class Nd2Fe14B. Operational conditions may differ from theoretical values. Treat these data as a supplementary guide for designers.

Table 1: Static pull force (pull vs distance) - power drop
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
 medium risk
1 mm 2736 Gs
273.6 mT
 4.09 kg / 9.01 pounds
4085.7 g / 40.1 N
 medium risk
2 mm 2372 Gs
237.2 mT
 3.07 kg / 6.77 pounds
3069.9 g / 30.1 N
 medium risk
3 mm 2007 Gs
200.7 mT
 2.20 kg / 4.84 pounds
2197.4 g / 21.6 N
 medium risk
5 mm 1377 Gs
137.7 mT
 1.03 kg / 2.28 pounds
1034.5 g / 10.1 N
 safe
10 mm 526 Gs
52.6 mT
 0.15 kg / 0.33 pounds
151.3 g / 1.5 N
 safe
15 mm 232 Gs
23.2 mT
 0.03 kg / 0.06 pounds
29.3 g / 0.3 N
 safe
20 mm 118 Gs
11.8 mT
 0.01 kg / 0.02 pounds
7.6 g / 0.1 N
 safe
30 mm 42 Gs
4.2 mT
 0.00 kg / 0.00 pounds
0.9 g / 0.0 N
 safe
50 mm 10 Gs
1.0 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 safe
Pulling power decreases drastically per each millimeter of gap. Note that even a microscopic distance (e.g., contamination, paint, dust) noticeably weakens the grip. Neodymiums work strongest at the point of direct contact; gap drastically cuts the power. Observe how flashily the pull force drop, when the magnet does not adhere tightly to the steel surface. When planning the mounting, avoid unnecessary gaps.

Table 2: Slippage force (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
This section presents the approximate weight limit sufficient to initiate the sliding of the magnet vertically on a upright steel plate (assuming typical friction). This parameter is relative to the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
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 magnet on a upright surface (e.g., a fridge), it will maintain just approx. 1/5 of its nominal power. Gravity and a weak degree of grip cause that products move down faster than they pop off the substrate. Designing a hanger? Consider that the sliding force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the magnet will give way down under a noticeably lighter weight. Using a rubber layer can drastically raise the stability.

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 metal plate is unable to conduct the entire magnetic field, which wastes potential of the holder. Should you install a neodymium to a too thin substrate, the flux will penetrate right through and the pull force will drop sharply. To squeeze 100% of this neodymium's potential, you need a suitably thick piece of steel. The material oversaturation means that on thin elements (e.g., appliance housings), the holder holds weaker. We recommend selecting the steel dimension based on the following data.

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
Standard neodymium magnets change their properties strength after exceeding the maximum temperature. Avoid high temperatures – excessive heat can permanently destroy this magnet. With every degree above norm, the neodymium's power momentarily decreases. Refrain from using this product close to ovens higher than its operating temperature limit. Exceeding the critical threshold will lead to destruction of magnetism.
*Technical advisory: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) risk losing magnetic properties sooner than long magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MP 15x7/3.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 magnetic products interact from a much further distance than a neodymium and metal setup. Such a system of magnet-to-magnet produces a massive flux and a wider radius of action. Want to build a solid fastener? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the pinch force is massive. The repulsion force is marginally weaker than the attraction, but still large.
*Flux density in repulsion mode is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Important: Calculations show shear force of a pair of identical magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (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
Timepiece 20 Gs (2.0 mT) 4.0 cm
Mobile device 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 real danger to electronics and medical implants. These neodymiums produce a field that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and plastic. Special caution must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - 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
NdFeB products are prone to chipping – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose turns into a projectile. Striking energy can destroy the magnet or painful pinches to skin. Be sure to control the product during mounting so it doesn't hit with great force against the steel surface. A collision at high speed ends with a crack of the magnet. Wear safety glasses when handling 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction 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)
Flux value emitted by the pole surface. Key data in coil applications and motors. Pc value determines the magnet's operating point.

Table 11: Submerged application
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: 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. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

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

2. Plate thickness effect

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

3. Temperature resistance

*For standard magnets, 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 specification and ecology
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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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 easy screwing to wood, wall, plastic, or metal. 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 great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. The flat screw head should evenly press the magnet. 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.
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.
This model is characterized by dimensions Ø15x5 mm and a weight of 6.27 g. The key parameter here is the holding force amounting to approximately 5.09 kg (force ~49.95 N). 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. 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They retain full power for nearly ten years – the loss is just ~1% (according to analyses),
  • They retain their magnetic properties even under external field action,
  • A magnet with a metallic gold surface is more attractive,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Considering the option of precise molding and adaptation to unique solutions, magnetic components can be created in a wide range of forms and dimensions, which increases their versatility,
  • Universal use in advanced technology sectors – they are commonly used in HDD drives, electromotive mechanisms, precision medical tools, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices

Cons

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • 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 and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Limited ability of creating threads in the magnet and complex forms - preferred is cover - mounting mechanism.
  • Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding force – what it depends on?

Breakaway force was defined for optimal configuration, taking into account:
  • with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with an polished touching surface
  • with zero gap (without paint)
  • during pulling in a direction perpendicular to the plane
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

Bear in mind that the magnet holding will differ subject to the following factors, in order of importance:
  • Gap between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material composition – not every steel reacts the same. Alloy additives weaken the attraction effect.
  • Surface finish – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Safe handling of neodymium magnets
Nickel allergy

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or select versions in plastic housing.

Protective goggles

Watch out for shards. Magnets can fracture upon violent connection, launching shards into the air. We recommend safety glasses.

Magnetic interference

GPS units and mobile phones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Operating temperature

Keep cool. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Mechanical processing

Drilling and cutting of neodymium magnets carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Powerful field

Handle magnets with awareness. Their powerful strength can surprise even professionals. Stay alert and do not underestimate their force.

Health Danger

Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Adults only

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

Crushing risk

Protect your hands. Two large magnets will join instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Magnetic media

Do not bring magnets close to a wallet, computer, or screen. The magnetic field can permanently damage these devices and erase data from cards.

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