Product available Ships today (order by 14:00)

MP 15x7/3.5x3 / N38 - ring magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: PLN 1-6500
Rating: 5

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

product details »

1.747 ZŁ with VAT / pcs + price for transport

1.420 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

1.420 ZŁ

1.747 ZŁ

price from 450 pcs

1.335 ZŁ

1.642 ZŁ

price from 1800 pcs

1.250 ZŁ

1.537 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Need help making a decision?

Give us a call +48 888 99 98 98 alternatively get in touch through contact form through our site.
Weight as well as form of magnets can be verified with our our magnetic calculator.

Orders submitted before 14:00 will be dispatched today!

Physical properties - 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

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

Engineering simulation of the assembly - technical parameters

These information constitute the outcome of a engineering simulation. Results are based on algorithms for the material Nd₂Fe₁₄B. Actual parameters might slightly deviate from the simulation results. Please consider these calculations as a reference point when designing systems.

Table 1: Static pull force (pull 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 lbs 2710.0 g / 26.6 N	strong
1 mm	1833 Gs 183.3 mT	2.29 kg / 5.05 lbs 2289.1 g / 22.5 N	strong
2 mm	1618 Gs 161.8 mT	1.78 kg / 3.93 lbs 1784.1 g / 17.5 N	safe
3 mm	1385 Gs 138.5 mT	1.31 kg / 2.88 lbs 1307.5 g / 12.8 N	safe
5 mm	959 Gs 95.9 mT	0.63 kg / 1.38 lbs 627.1 g / 6.2 N	safe
10 mm	362 Gs 36.2 mT	0.09 kg / 0.20 lbs 89.3 g / 0.9 N	safe
15 mm	156 Gs 15.6 mT	0.02 kg / 0.04 lbs 16.5 g / 0.2 N	safe
20 mm	78 Gs 7.8 mT	0.00 kg / 0.01 lbs 4.1 g / 0.0 N	safe
30 mm	27 Gs 2.7 mT	0.00 kg / 0.00 lbs 0.5 g / 0.0 N	safe
50 mm	6 Gs 0.6 mT	0.00 kg / 0.00 lbs 0.0 g / 0.0 N	safe

Magnetic force weakens significantly per each millimeter of gap. Remember that even a microscopic distance (e.g., dirt, varnish, rust) significantly weakens the grip. Magnetic products operate most effectively in perfect adhesion; gap weakens the power. Observe how quickly the load capacity drop, when the magnet does not adhere directly to the steel surface. When calculating the assembly, eliminate redundant distances.

Table 2: Vertical capacity (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 lbs 542.0 g / 5.3 N
1 mm	Stal (~0.2)	0.46 kg / 1.01 lbs 458.0 g / 4.5 N
2 mm	Stal (~0.2)	0.36 kg / 0.78 lbs 356.0 g / 3.5 N
3 mm	Stal (~0.2)	0.26 kg / 0.58 lbs 262.0 g / 2.6 N
5 mm	Stal (~0.2)	0.13 kg / 0.28 lbs 126.0 g / 1.2 N
10 mm	Stal (~0.2)	0.02 kg / 0.04 lbs 18.0 g / 0.2 N
15 mm	Stal (~0.2)	0.00 kg / 0.01 lbs 4.0 g / 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.00 lbs 0.0 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 defines the theoretical force required to cause the sliding of the magnet vertically against a vertical steel wall (assuming typical friction). This parameter depends on the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - 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 lbs 813.0 g / 8.0 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.54 kg / 1.19 lbs 542.0 g / 5.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.27 kg / 0.60 lbs 271.0 g / 2.7 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.36 kg / 2.99 lbs 1355.0 g / 13.3 N

When mounting a holder on a vertical wall (e.g., a fridge), it you can count on only approx. 1/5 of its maximum pull force. Gravity as well as a low friction coefficient mean that magnets slide down faster than they detach. Want to create a hanger? Remember that the shear force is significantly lower than the maximum static pull force. On a painted metal, the element will slide down under a much lighter weight. Application of an anti-slip pad can effectively increase the grip.

Table 4: Material efficiency (saturation) - power losses
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 lbs 271.0 g / 2.7 N
1 mm	25%	0.68 kg / 1.49 lbs 677.5 g / 6.6 N
2 mm	50%	1.36 kg / 2.99 lbs 1355.0 g / 13.3 N
3 mm	75%	2.03 kg / 4.48 lbs 2032.5 g / 19.9 N
5 mm	100%	2.71 kg / 5.97 lbs 2710.0 g / 26.6 N
10 mm	100%	2.71 kg / 5.97 lbs 2710.0 g / 26.6 N
11 mm	100%	2.71 kg / 5.97 lbs 2710.0 g / 26.6 N
12 mm	100%	2.71 kg / 5.97 lbs 2710.0 g / 26.6 N

A too thin steel is incapable of focus the entire magnetic field, which weakens actual performance of the magnet. Should you attach a powerful product to a thin surface, the flux will penetrate right through and the attraction force will be weaker. To squeeze the maximum of this neodymium's potential, you require a sufficiently solid element of metal. The material oversaturation means that on thin elements (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel thickness from these parameters.

Table 5: Thermal stability (material behavior) - thermal limit
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 lbs 2710.0 g / 26.6 N	OK
40 °C	-2.2%	2.65 kg / 5.84 lbs 2650.4 g / 26.0 N	OK
60 °C	-4.4%	2.59 kg / 5.71 lbs 2590.8 g / 25.4 N
80 °C	-6.6%	2.53 kg / 5.58 lbs 2531.1 g / 24.8 N
100 °C	-28.8%	1.93 kg / 4.25 lbs 1929.5 g / 18.9 N

Ordinary NdFeB products change their properties power past the thermal threshold. Watch out for overheating – heat can permanently demagnetize this product. With every degree above norm, the magnet's force temporarily lowers. Do not use this product near heat sources higher than its working range. Exceeding the critical threshold will cause permanent loss of magnetic properties.

*Technical advisory: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) may lose charge permanently at lower temperatures than taller cylinders. Warning indicator in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field collision
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 lbs 3 483 Gs	0.52 kg / 1.15 lbs 523 g / 5.1 N	N/A
1 mm	3.24 kg / 7.14 lbs 3 846 Gs	0.49 kg / 1.07 lbs 486 g / 4.8 N	2.91 kg / 6.43 lbs ~0 Gs
2 mm	2.94 kg / 6.49 lbs 3 666 Gs	0.44 kg / 0.97 lbs 441 g / 4.3 N	2.65 kg / 5.84 lbs ~0 Gs
3 mm	2.62 kg / 5.78 lbs 3 460 Gs	0.39 kg / 0.87 lbs 393 g / 3.9 N	2.36 kg / 5.20 lbs ~0 Gs
5 mm	1.98 kg / 4.36 lbs 3 004 Gs	0.30 kg / 0.65 lbs 296 g / 2.9 N	1.78 kg / 3.92 lbs ~0 Gs
10 mm	0.81 kg / 1.78 lbs 1 919 Gs	0.12 kg / 0.27 lbs 121 g / 1.2 N	0.73 kg / 1.60 lbs ~0 Gs
20 mm	0.11 kg / 0.25 lbs 724 Gs	0.02 kg / 0.04 lbs 17 g / 0.2 N	0.10 kg / 0.23 lbs ~0 Gs
50 mm	0.00 kg / 0.00 lbs 88 Gs	0.00 kg / 0.00 lbs 0 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs
60 mm	0.00 kg / 0.00 lbs 54 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 35 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 24 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 17 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 13 Gs	0.00 kg / 0.00 lbs 0 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs

Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal setup. Such a system 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 bringing together two magnets, the pinch force is huge. The levitation is slightly lower than the connection force, but still impressive.
*The magnetic induction between like poles reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Important: Figures refer to shear force of two identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - precautionary measures
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

Powerful magnet radiation poses a real danger to electronic devices and pacemakers. These magnets produce a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with hearing aids and drug dispensers. 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: Dynamics (kinetic energy) - warning
MP 15x7/3.5x3 / N38

Start from (mm)	Speed (km/h)	Energy (J)
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 very brittle – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely becomes dangerous. Kinetic force can cause material chips or painful pinches to fingers. Be sure to control the product during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Corrosion resistance
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)

The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Construction data (P_c)
MP 15x7/3.5x3 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	3 461 Mx	34.6 µWb
P_c Coefficient	0.26	Low (Flat)

Flux value passing through the magnet pole. Key data when building generators and motors. P_c value defines the magnet's operating point.

Table 11: Submerged application
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%

Rust risk: 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. Buoyancy helps in lifting finds.

1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds just ~20% of its max power.

2. Steel saturation

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

3. Power loss vs temp

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

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

chart generated for the permeance coefficient P_c (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 P_c (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 P_c 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%

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: 030182-2026

Quick Unit Converter

Pulling force

Force in kg

Newtons (N)

Force in lbs

Magnetic Field

Type data in a box, to see the rest change automatically.

Other proposals

Product available Ships today (order by 14:00)

MW 5x7 / N38 - cylindrical magnet

0.726 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

MW 15x8 / N38 - cylindrical magnet

4.92 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

MPL 50x30x4 / N38 - lamellar magnet

25.83 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

MPL 100x40x20 / N38 - lamellar magnet

335.30 ZŁ brutto / pcs

The ring magnet with a hole 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. When tightening the screw, you must maintain great sensitivity. 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 rubber spacer 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 does not ensure full waterproofing. 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. 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 3 mm. The key parameter here is the lifting capacity amounting to approximately 2.71 kg (force ~26.61 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. 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.

Pros and cons of Nd₂Fe₁₄B magnets.

Pros

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:

They retain magnetic properties for almost ten years – the drop is just ~1% (in theory),
They are extremely resistant to demagnetization induced by presence of other magnetic fields,
Thanks to the shiny finish, the layer of Ni-Cu-Ni, gold, or silver gives an modern appearance,
The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
Thanks to freedom in constructing and the capacity to modify to complex applications,
Wide application in future technologies – they are commonly used in computer drives, electric motors, advanced medical instruments, as well as technologically advanced constructions.
Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of neodymium magnets:

To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and 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
Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
Limited ability of making threads in the magnet and complicated forms - recommended is a housing - mounting mechanism.
Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these devices can complicate diagnosis medical when they are in the body.
With large orders the cost of neodymium magnets is a challenge,

Lifting parameters

Magnetic strength at its maximum – what affects it?

Information about lifting capacity was determined for ideal contact conditions, taking into account:

with the application of a yoke made of special test steel, guaranteeing maximum field concentration
whose thickness equals approx. 10 mm
with a plane free of scratches
without the slightest clearance between the magnet and steel
during pulling in a direction perpendicular to the plane
at temperature room level

Practical aspects of lifting capacity – factors

Bear in mind that the application force will differ influenced by the following factors, in order of importance:

Clearance – existence of any layer (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
Direction of force – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
Plate material – mild steel gives the best results. Higher carbon content decrease magnetic properties and holding force.
Plate texture – ground elements guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance between the magnet and the plate lowers the load capacity.

Safe handling of NdFeB magnets

Maximum temperature

Avoid heat. Neodymium magnets are sensitive to temperature. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).

Life threat

Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Fire warning

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Do not underestimate power

Be careful. Rare earth magnets attract from a long distance and snap with huge force, often quicker than you can react.

Electronic hazard

Powerful magnetic fields can destroy records on credit cards, HDDs, and storage devices. Stay away of at least 10 cm.

Magnet fragility

Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

GPS and phone interference

Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a strong magnet can ruin the internal compass in your phone.

Nickel allergy

It is widely known that nickel (standard magnet coating) is a strong allergen. If you have an allergy, avoid direct skin contact or select coated magnets.

Adults only

NdFeB magnets are not intended for children. Accidental ingestion of a few magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates immediate surgery.

Pinching danger

Large magnets can crush fingers in a fraction of a second. Do not put your hand between two attracting surfaces.

Danger! More info about risks in the article: Safety of working with magnets.

MP 15x7/3.5x3 / N38 - ring magnet

Physical properties - MP 15x7/3.5x3 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the assembly - technical parameters

Table 1: Static pull force (pull vs distance) - characteristics MP 15x7/3.5x3 / N38

Table 2: Vertical capacity (vertical surface) MP 15x7/3.5x3 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MP 15x7/3.5x3 / N38

Table 4: Material efficiency (saturation) - power losses MP 15x7/3.5x3 / N38

Table 5: Thermal stability (material behavior) - thermal limit MP 15x7/3.5x3 / N38

Table 6: Two magnets (attraction) - field collision MP 15x7/3.5x3 / N38

Table 7: Protective zones (electronics) - precautionary measures MP 15x7/3.5x3 / N38

Table 8: Dynamics (kinetic energy) - warning MP 15x7/3.5x3 / N38

Table 9: Corrosion resistance MP 15x7/3.5x3 / N38

Table 10: Construction data (Pc) MP 15x7/3.5x3 / N38

Table 11: Submerged application MP 15x7/3.5x3 / N38

1. Wall mount (shear)

2. Steel saturation

3. Power loss vs temp

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

Elemental analysis

Ecology and recycling (GPSR)

Pulling force

Magnetic Field

Other proposals

MW 5x7 / N38 - cylindrical magnet

MW 15x8 / N38 - cylindrical magnet

MPL 50x30x4 / N38 - lamellar magnet

MPL 100x40x20 / N38 - lamellar magnet

Pros and cons of Nd2Fe14B magnets.

Pros

Disadvantages

Lifting parameters

Magnetic strength at its maximum – what affects it?

Practical aspects of lifting capacity – factors

Safe handling of NdFeB magnets

Maximum temperature

Life threat

Fire warning

Do not underestimate power

Electronic hazard

Magnet fragility

GPS and phone interference

Nickel allergy

Adults only

Pinching danger

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs distance) - characteristics
MP 15x7/3.5x3 / N38

Table 2: Vertical capacity (vertical surface)
MP 15x7/3.5x3 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 15x7/3.5x3 / N38

Table 4: Material efficiency (saturation) - power losses
MP 15x7/3.5x3 / N38

Table 5: Thermal stability (material behavior) - thermal limit
MP 15x7/3.5x3 / N38

Table 6: Two magnets (attraction) - field collision
MP 15x7/3.5x3 / N38

Table 7: Protective zones (electronics) - precautionary measures
MP 15x7/3.5x3 / N38

Table 8: Dynamics (kinetic energy) - warning
MP 15x7/3.5x3 / N38

Table 9: Corrosion resistance
MP 15x7/3.5x3 / N38

Table 10: Construction data (P_c)
MP 15x7/3.5x3 / N38

Table 11: Submerged application
MP 15x7/3.5x3 / N38

Pros and cons of Nd₂Fe₁₄B magnets.