Product available Ships today (order by 14:00)

MP 15x7/3.5x5 / 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 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

check technical data »

3.44 ZŁ with VAT / pcs + price for transport

2.80 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

2.80 ZŁ

3.44 ZŁ

price from 250 pcs

2.63 ZŁ

3.24 ZŁ

price from 900 pcs

2.46 ZŁ

3.03 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Need advice?

Give us a call +48 888 99 98 98 otherwise drop us a message via inquiry form the contact form page.
Strength and form of a magnet can be verified with our modular calculator.

Orders submitted before 14:00 will be dispatched today!

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

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 modeling of the assembly - data

These data are the outcome of a engineering calculation. Values were calculated on algorithms for the material Nd₂Fe₁₄B. Real-world conditions might slightly differ. Please consider these calculations as a supplementary guide for designers.

Table 1: Static force (force vs gap) - 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	strong
1 mm	2736 Gs 273.6 mT	4.09 kg / 9.01 pounds 4085.7 g / 40.1 N	strong
2 mm	2372 Gs 237.2 mT	3.07 kg / 6.77 pounds 3069.9 g / 30.1 N	strong
3 mm	2007 Gs 200.7 mT	2.20 kg / 4.84 pounds 2197.4 g / 21.6 N	strong
5 mm	1377 Gs 137.7 mT	1.03 kg / 2.28 pounds 1034.5 g / 10.1 N	weak grip
10 mm	526 Gs 52.6 mT	0.15 kg / 0.33 pounds 151.3 g / 1.5 N	weak grip
15 mm	232 Gs 23.2 mT	0.03 kg / 0.06 pounds 29.3 g / 0.3 N	weak grip
20 mm	118 Gs 11.8 mT	0.01 kg / 0.02 pounds 7.6 g / 0.1 N	weak grip
30 mm	42 Gs 4.2 mT	0.00 kg / 0.00 pounds 0.9 g / 0.0 N	weak grip
50 mm	10 Gs 1.0 mT	0.00 kg / 0.00 pounds 0.1 g / 0.0 N	weak grip

Pulling power weakens drastically per each millimeter of gap. Note that every additional insulation layer (e.g., contamination, varnish, dust) noticeably diminishes the holding power. Neodymiums operate strongest during direct contact; gap nullifies the force. See how flashily the parameters fall, when the product does not adhere tightly to the steel surface. When planning the assembly, discard redundant distances.

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

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	1.02 kg / 2.24 pounds 1018.0 g / 10.0 N
1 mm	Stal (~0.2)	0.82 kg / 1.80 pounds 818.0 g / 8.0 N
2 mm	Stal (~0.2)	0.61 kg / 1.35 pounds 614.0 g / 6.0 N
3 mm	Stal (~0.2)	0.44 kg / 0.97 pounds 440.0 g / 4.3 N
5 mm	Stal (~0.2)	0.21 kg / 0.45 pounds 206.0 g / 2.0 N
10 mm	Stal (~0.2)	0.03 kg / 0.07 pounds 30.0 g / 0.3 N
15 mm	Stal (~0.2)	0.01 kg / 0.01 pounds 6.0 g / 0.1 N
20 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 2.0 g / 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N

This section defines the theoretical weight limit sufficient to initiate the slippage of the magnet vertically on a vertical steel wall (assuming standard friction). The holding force varies with the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - 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 vertical plane (e.g., a fridge), it will only hold just approx. 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient influence the fact that holders move down faster than they pull off. Planning a wall mount? Note that the sliding force is much weaker 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 layer can effectively raise the stability.

Table 4: Material efficiency (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 too thin steel is incapable of take in the entire magnetic field, which weakens actual performance of the holder. If you attach a powerful product to a weak sheet, the flux will pass right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's potential, you need a suitably thick element of steel. The saturation phenomenon means that on thin elements (e.g., thin profiles), the holder works worse. We advise picking the steel thickness according to the table below.

Table 5: Thermal stability (stability) - 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 pounds 5090.0 g / 49.9 N	OK
40 °C	-2.2%	4.98 kg / 10.97 pounds 4978.0 g / 48.8 N	OK
60 °C	-4.4%	4.87 kg / 10.73 pounds 4866.0 g / 47.7 N
80 °C	-6.6%	4.75 kg / 10.48 pounds 4754.1 g / 46.6 N
100 °C	-28.8%	3.62 kg / 7.99 pounds 3624.1 g / 35.6 N

Classic neodymiums change their properties parameters past the thermal threshold. Watch out for overheating – excessive heat can irreversibly demagnetize this magnet. With increasing heat, the magnet's capacity momentarily lowers. Do not use this magnet in hot environments exceeding its working range. Ignoring the limit will lead to permanent loss of magnetic properties.

*Engineering note: Thermal stability is determined by both grade, as well as the dimension ratios. Thin magnets (low Pc) are more susceptible to demagnetization sooner compared to rod magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

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

Gap (mm)	Attraction (kg/lbs) (N-S)	Sliding Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	8.17 kg / 18.00 pounds 4 643 Gs	1.22 kg / 2.70 pounds 1225 g / 12.0 N	N/A
1 mm	7.39 kg / 16.29 pounds 5 810 Gs	1.11 kg / 2.44 pounds 1108 g / 10.9 N	6.65 kg / 14.66 pounds ~0 Gs
2 mm	6.55 kg / 14.45 pounds 5 472 Gs	0.98 kg / 2.17 pounds 983 g / 9.6 N	5.90 kg / 13.01 pounds ~0 Gs
3 mm	5.72 kg / 12.62 pounds 5 113 Gs	0.86 kg / 1.89 pounds 858 g / 8.4 N	5.15 kg / 11.35 pounds ~0 Gs
5 mm	4.19 kg / 9.23 pounds 4 374 Gs	0.63 kg / 1.38 pounds 628 g / 6.2 N	3.77 kg / 8.31 pounds ~0 Gs
10 mm	1.66 kg / 3.66 pounds 2 753 Gs	0.25 kg / 0.55 pounds 249 g / 2.4 N	1.49 kg / 3.29 pounds ~0 Gs
20 mm	0.24 kg / 0.54 pounds 1 053 Gs	0.04 kg / 0.08 pounds 36 g / 0.4 N	0.22 kg / 0.48 pounds ~0 Gs
50 mm	0.00 kg / 0.01 pounds 134 Gs	0.00 kg / 0.00 pounds 1 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
60 mm	0.00 kg / 0.00 pounds 83 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
70 mm	0.00 kg / 0.00 pounds 55 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
80 mm	0.00 kg / 0.00 pounds 38 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
90 mm	0.00 kg / 0.00 pounds 27 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
100 mm	0.00 kg / 0.00 pounds 20 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs

Two strong neodymiums attract each other from a much further distance than a neodymium and metal combination. The connection of two magnets generates a stronger field and a larger range of action. Planning to create a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Be careful that when connecting a pair of magnets, the impact force is extreme. The levitation is slightly lower than the connection force, but still significant.
*Flux density between like poles is approximately ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Important: Results show sliding force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - precautionary measures
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 serious hazard to IT equipment as well as pacemakers. These magnets generate a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation acts through matter and plastic. Exceptional care must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MP 15x7/3.5x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
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 causes immediate chipping. Control the attraction moment – a magnet released freely turns into a projectile. Kinetic force can cause material chips or injury to skin. Always hold the magnet during bringing near metal so it doesn't slam with momentum against the steel surface. A collision at high speed means shattering of the neodymium. Wear safety glasses when working with large magnets.

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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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

Parameter	Value	SI Unit / Description
Magnetic Flux	4 791 Mx	47.9 µWb
P_c Coefficient	0.39	Low (Flat)

Total magnetic flux passing through the pole surface. Key data for generator designers as well as sensors. P_c value defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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!

Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Vertical hold

*Warning: On a vertical wall, the magnet holds only a fraction of its nominal pull.

2. Steel thickness impact

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

3. Power loss vs temp

*For standard magnets, 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) = 0.39

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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

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%

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

Quick Unit Converter

Force (pull)

lbs

Magnetic Field

Gauss (Gs)

Type a number in one of the inputs, to see the remaining fields convert automatically.

View more proposals

Product available Ships today (order by 14:00)

SM 25x125 [2xM8] / N52 - magnetic separator

393.60 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

FM Ruszt magnetyczny do leja fi 200 dwupoziomowy / N52 - magnetic filter

4458.75 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

UMH 60x15x69 [M8] / N38 - magnetic holder with hook

143.91 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

AM klisza magnetyczna 50 x 50 mm - magnetic accessories

24.60 ZŁ brutto / pcs

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. 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. One turn too many can destroy the magnet, so do it slowly. The flat screw head should evenly press the magnet. Remember: cracking during assembly results from material properties, not a product defect.

These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.

The inner hole diameter determines the maximum size of the mounting element. If the magnet does not have a chamfer (cone), we recommend using a screw with a flat or cylindrical head, or possibly using a washer. Always check that the screw head is not larger than the outer diameter of the magnet (15 mm), so it doesn't protrude beyond the outline.

It is a magnetic ring with a diameter of 15 mm and thickness 5 mm. The pulling force of this model is an impressive 5.09 kg, which translates to 49.95 N in newtons. The 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. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros and cons of rare earth magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:

They retain full power for almost 10 years – the loss is just ~1% (in theory),
They have excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
Thanks to the shimmering finish, the surface of nickel, gold-plated, or silver-plated gives an clean appearance,
They feature high magnetic induction at the operating surface, which affects their effectiveness,
Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
Considering the potential of free shaping and customization to unique projects, neodymium magnets can be produced in a variety of forms and dimensions, which amplifies use scope,
Fundamental importance in high-tech industry – they are commonly used in magnetic memories, drive modules, medical equipment, and technologically advanced constructions.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:

To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
Limited ability of creating threads in the magnet and complex shapes - recommended is casing - mounting mechanism.
Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these devices are able to disrupt the diagnostic process medical in case of swallowing.
With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Maximum lifting capacity of the magnet – what contributes to it?

The declared magnet strength concerns the limit force, measured under optimal environment, specifically:

using a base made of high-permeability steel, functioning as a magnetic yoke
with a thickness minimum 10 mm
with a surface perfectly flat
with total lack of distance (without coatings)
under perpendicular application of breakaway force (90-degree angle)
in temp. approx. 20°C

Practical lifting capacity: influencing factors

During everyday use, the real power results from many variables, ranked from the most important:

Distance – existence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits 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 penetrates through instead of converting into lifting capacity.
Plate material – low-carbon steel gives the best results. Alloy steels decrease magnetic properties and holding force.
Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was determined with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets

ICD Warning

For implant holders: Powerful magnets affect medical devices. Keep at least 30 cm distance or request help to handle the magnets.

Power loss in heat

Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Fire risk

Dust produced during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Sensitization to coating

Certain individuals have a hypersensitivity to Ni, which is the typical protective layer for neodymium magnets. Extended handling can result in an allergic reaction. We recommend use safety gloves.

Pinching danger

Mind your fingers. Two large magnets will join instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!

Respect the power

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

Data carriers

Equipment safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, mechanical watches).

GPS and phone interference

A strong magnetic field negatively affects the functioning of magnetometers in smartphones and GPS navigation. Keep magnets near a device to avoid breaking the sensors.

Fragile material

NdFeB magnets are ceramic materials, meaning they are fragile like glass. Clashing of two magnets leads to them cracking into small pieces.

Choking Hazard

Strictly keep magnets out of reach of children. Ingestion danger is high, and the effects of magnets connecting inside the body are very dangerous.

Attention! Learn more about risks in the article: Safety of working with magnets.

MP 15x7/3.5x5 / N38 - ring magnet

Physical properties - MP 15x7/3.5x5 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the assembly - data

Table 1: Static force (force vs gap) - power drop MP 15x7/3.5x5 / N38

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

Table 3: Vertical assembly (sliding) - vertical pull MP 15x7/3.5x5 / N38

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

Table 5: Thermal stability (stability) - power drop MP 15x7/3.5x5 / N38

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

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

Table 8: Collisions (kinetic energy) - warning MP 15x7/3.5x5 / N38

Table 9: Coating parameters (durability) MP 15x7/3.5x5 / N38

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

Table 11: Hydrostatics and buoyancy MP 15x7/3.5x5 / N38

1. Vertical hold

2. Steel thickness impact

3. Power loss vs temp

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

Material specification

Sustainability

Force (pull)

Magnetic Field

View more proposals

SM 25x125 [2xM8] / N52 - magnetic separator

FM Ruszt magnetyczny do leja fi 200 dwupoziomowy / N52 - magnetic filter

UMH 60x15x69 [M8] / N38 - magnetic holder with hook

AM klisza magnetyczna 50 x 50 mm - magnetic accessories

Pros and cons of rare earth magnets.

Advantages

Weaknesses

Lifting parameters

Maximum lifting capacity of the magnet – what contributes to it?

Practical lifting capacity: influencing factors

Precautions when working with NdFeB magnets

ICD Warning

Power loss in heat

Fire risk

Sensitization to coating

Pinching danger

Respect the power

Data carriers

GPS and phone interference

Fragile material

Choking Hazard

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs gap) - power drop
MP 15x7/3.5x5 / N38

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

Table 3: Vertical assembly (sliding) - vertical pull
MP 15x7/3.5x5 / N38

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

Table 5: Thermal stability (stability) - power drop
MP 15x7/3.5x5 / N38

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

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

Table 8: Collisions (kinetic energy) - warning
MP 15x7/3.5x5 / N38

Table 9: Coating parameters (durability)
MP 15x7/3.5x5 / N38

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

Table 11: Hydrostatics and buoyancy
MP 15x7/3.5x5 / N38