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MW 20x2.5 / N38 - cylindrical 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

cylindrical magnet

Catalog no 010042

GTIN/EAN: 5906301810414

5.00

Diameter Ø

20 mm [±0,1 mm]

Height

2.5 mm [±0,1 mm]

Weight

5.89 g

Magnetization Direction

↑ axial

Load capacity

2.41 kg / 23.63 N

Magnetic Induction

150.34 mT / 1503 Gs

Coating

[NiCuNi] Nickel

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3.01 ZŁ with VAT / pcs + price for transport

2.45 ZŁ net + 23% VAT / pcs

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Technical of the product - MW 20x2.5 / N38 - cylindrical magnet

Specification / characteristics - MW 20x2.5 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010042
GTIN/EAN	5906301810414
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 Ø	20 mm [±0,1 mm]
Height	2.5 mm [±0,1 mm]
Weight	5.89 g
Magnetization Direction	↑ axial
Load capacity ~ ?	2.41 kg / 23.63 N
Magnetic Induction ~ ?	150.34 mT / 1503 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 20x2.5 / N38 - cylindrical 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 product - report

Presented data are the direct effect of a physical simulation. Values are based on algorithms for the class Nd₂Fe₁₄B. Operational performance might slightly differ. Please consider these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - characteristics
MW 20x2.5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	1503 Gs 150.3 mT	2.41 kg / 5.31 pounds 2410.0 g / 23.6 N	medium risk
1 mm	1431 Gs 143.1 mT	2.18 kg / 4.82 pounds 2184.9 g / 21.4 N	medium risk
2 mm	1328 Gs 132.8 mT	1.88 kg / 4.15 pounds 1882.0 g / 18.5 N	weak grip
3 mm	1206 Gs 120.6 mT	1.55 kg / 3.42 pounds 1552.2 g / 15.2 N	weak grip
5 mm	947 Gs 94.7 mT	0.96 kg / 2.11 pounds 957.1 g / 9.4 N	weak grip
10 mm	457 Gs 45.7 mT	0.22 kg / 0.49 pounds 223.1 g / 2.2 N	weak grip
15 mm	224 Gs 22.4 mT	0.05 kg / 0.12 pounds 53.7 g / 0.5 N	weak grip
20 mm	120 Gs 12.0 mT	0.02 kg / 0.03 pounds 15.4 g / 0.2 N	weak grip
30 mm	44 Gs 4.4 mT	0.00 kg / 0.00 pounds 2.1 g / 0.0 N	weak grip
50 mm	11 Gs 1.1 mT	0.00 kg / 0.00 pounds 0.1 g / 0.0 N	weak grip

Pulling power decreases sharply with every mm of gap. Note that even a very thin break (e.g., contamination, paint, dust) noticeably reduces the pull force. Neodymiums work most effectively at the point of direct contact; distance drastically cuts the power. Observe how quickly the load capacity plummet, when the product does not adhere tightly to the steel surface. When calculating the mounting, avoid unnecessary gaps.

Table 2: Slippage hold (wall)
MW 20x2.5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	0.48 kg / 1.06 pounds 482.0 g / 4.7 N
1 mm	Stal (~0.2)	0.44 kg / 0.96 pounds 436.0 g / 4.3 N
2 mm	Stal (~0.2)	0.38 kg / 0.83 pounds 376.0 g / 3.7 N
3 mm	Stal (~0.2)	0.31 kg / 0.68 pounds 310.0 g / 3.0 N
5 mm	Stal (~0.2)	0.19 kg / 0.42 pounds 192.0 g / 1.9 N
10 mm	Stal (~0.2)	0.04 kg / 0.10 pounds 44.0 g / 0.4 N
15 mm	Stal (~0.2)	0.01 kg / 0.02 pounds 10.0 g / 0.1 N
20 mm	Stal (~0.2)	0.00 kg / 0.01 pounds 4.0 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 shows the theoretical shear load sufficient to start the downward movement of the magnet vertically against a upright steel plate (considering standard friction coefficient). This value is a function of the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MW 20x2.5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.72 kg / 1.59 pounds 723.0 g / 7.1 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.48 kg / 1.06 pounds 482.0 g / 4.7 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.24 kg / 0.53 pounds 241.0 g / 2.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.21 kg / 2.66 pounds 1205.0 g / 11.8 N

When placing a element on a upright surface (e.g., a fridge), it you can count on barely approx. 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient influence the fact that magnets move down easier than they pull off. Want to create a vertical fastening? Remember that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the holder will slide down under a much lighter cargo. Utilizing a rubberized layer can significantly increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MW 20x2.5 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.24 kg / 0.53 pounds 241.0 g / 2.4 N
1 mm	25%	0.60 kg / 1.33 pounds 602.5 g / 5.9 N
2 mm	50%	1.21 kg / 2.66 pounds 1205.0 g / 11.8 N
3 mm	75%	1.81 kg / 3.98 pounds 1807.5 g / 17.7 N
5 mm	100%	2.41 kg / 5.31 pounds 2410.0 g / 23.6 N
10 mm	100%	2.41 kg / 5.31 pounds 2410.0 g / 23.6 N
11 mm	100%	2.41 kg / 5.31 pounds 2410.0 g / 23.6 N
12 mm	100%	2.41 kg / 5.31 pounds 2410.0 g / 23.6 N

A thin metal plate cannot absorb the entire magnetic field, which wastes potential of the holder. Should you mount a strong magnet to a too thin substrate, the magnetism will penetrate right through and the attraction force will be weaker. To utilize the maximum of this magnet's potential, you require a sufficiently solid element of metal. The saturation effect means that on sheet metal structures (e.g., car bodies), the magnet holds weaker. We advise picking the steel cross-section from these parameters.

Table 5: Working in heat (material behavior) - power drop
MW 20x2.5 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	2.41 kg / 5.31 pounds 2410.0 g / 23.6 N	OK
40 °C	-2.2%	2.36 kg / 5.20 pounds 2357.0 g / 23.1 N	OK
60 °C	-4.4%	2.30 kg / 5.08 pounds 2304.0 g / 22.6 N
80 °C	-6.6%	2.25 kg / 4.96 pounds 2250.9 g / 22.1 N
100 °C	-28.8%	1.72 kg / 3.78 pounds 1715.9 g / 16.8 N

Standard neodymium magnets change their properties parameters past the thermal threshold. Protect against heat – excessive heat can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's capacity momentarily decreases. Do not use this product near heat sources exceeding its working range. Ignoring the limit will lead to permanent loss of magnetism.

*Important note: Heat tolerance is determined by both grade, but also on the magnet's shape. Flat magnets (low Pc) risk losing magnetic properties under lower heat stress compared to rod magnets. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 20x2.5 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Shear Strength (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	4.38 kg / 9.65 pounds 2 771 Gs	0.66 kg / 1.45 pounds 656 g / 6.4 N	N/A
1 mm	4.20 kg / 9.25 pounds 2 944 Gs	0.63 kg / 1.39 pounds 629 g / 6.2 N	3.78 kg / 8.33 pounds ~0 Gs
2 mm	3.97 kg / 8.75 pounds 2 862 Gs	0.60 kg / 1.31 pounds 595 g / 5.8 N	3.57 kg / 7.87 pounds ~0 Gs
3 mm	3.70 kg / 8.17 pounds 2 766 Gs	0.56 kg / 1.22 pounds 556 g / 5.5 N	3.33 kg / 7.35 pounds ~0 Gs
5 mm	3.12 kg / 6.88 pounds 2 538 Gs	0.47 kg / 1.03 pounds 468 g / 4.6 N	2.81 kg / 6.19 pounds ~0 Gs
10 mm	1.74 kg / 3.83 pounds 1 895 Gs	0.26 kg / 0.57 pounds 261 g / 2.6 N	1.56 kg / 3.45 pounds ~0 Gs
20 mm	0.41 kg / 0.89 pounds 915 Gs	0.06 kg / 0.13 pounds 61 g / 0.6 N	0.36 kg / 0.80 pounds ~0 Gs
50 mm	0.01 kg / 0.02 pounds 140 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 / 0.01 pounds 88 Gs	0.00 kg / 0.00 pounds 1 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
70 mm	0.00 kg / 0.00 pounds 58 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 41 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 29 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 22 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs

Two magnets interact from a wider radius than a magnet and steel setup. Such a system of two magnets creates a more powerful interaction and a wider radius of operation. Designing a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the collision energy is huge. The repulsion force is a bit weaker than the attraction, but still significant.
*Field value in repulsion mode reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
Note: Results apply to friction force of a pair of same neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - warnings
MW 20x2.5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	7.0 cm
Hearing aid	10 Gs (1.0 mT)	5.5 cm
Mechanical watch	20 Gs (2.0 mT)	4.5 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

A strong magnetic field is a real danger to electronics and medical implants. These magnets generate a field that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation acts through matter and plastic. Exceptional care must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MW 20x2.5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	21.55 km/h (5.99 m/s)	0.11 J
30 mm	35.35 km/h (9.82 m/s)	0.28 J
50 mm	45.62 km/h (12.67 m/s)	0.47 J
100 mm	64.51 km/h (17.92 m/s)	0.95 J

Magnetic elements are very brittle – a collision with steel can result in shattering. Watch the impact speed – a neodymium left loose becomes dangerous. Impact energy can destroy the magnet or painful pinches to fingers. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Anti-corrosion coating durability
MW 20x2.5 / 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: Electrical data (Flux)
MW 20x2.5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	5 996 Mx	60.0 µWb
P_c Coefficient	0.19	Low (Flat)

Flux value passing through the magnet pole. Essential parameter when building generators and motors. P_c value defines the working geometry.

Table 11: Physics of underwater searching
MW 20x2.5 / N38

Environment	Effective steel pull	Effect
Air (land)	2.41 kg	Standard
Water (riverbed)	2.76 kg (+0.35 kg buoyancy gain)	+14.5%

Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Sliding resistance

*Caution: On a vertical surface, the magnet holds just a fraction of its nominal pull.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Heat tolerance

*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) = 0.19

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 and environmental data

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: 010042-2026

Measurement Calculator

Force (pull)

Newtons (N)

Pounds (lbs)

Field Strength

Gauss (Gs)

Insert a value in one of the inputs, to see all other values convert in real-time.

HH 42x8.8 [M6] / N38 - through hole magnetic holder

29.89 ZŁ brutto / pcs

Product available Ships tomorrow

MW 15x5 / N38 - cylindrical magnet

3.20 ZŁ brutto / pcs

Product available Ships tomorrow

CM PML-3 / N45 - magnetic gripper

938.99 ZŁ brutto / pcs

Product available Ships tomorrow

MPL 40x10x4 / N38 - lamellar magnet

4.87 ZŁ brutto / pcs

This product is an extremely powerful cylindrical magnet, composed of advanced NdFeB material, which, with dimensions of Ø20x2.5 mm, guarantees the highest energy density. The MW 20x2.5 / N38 model boasts high dimensional repeatability and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 2.41 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.

This model is perfect for building electric motors, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 23.63 N with a weight of only 5.89 g, this rod is indispensable in electronics and wherever every gram matters.

Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 20.1 mm) using epoxy glues. To ensure stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.

Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø20x2.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.

This model is characterized by dimensions Ø20x2.5 mm, which, at a weight of 5.89 g, makes it an element with impressive magnetic energy density. The value of 23.63 N means that the magnet is capable of holding a weight many times exceeding its own mass of 5.89 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.

This rod magnet is magnetized axially (along the height of 2.5 mm), which means that the N and S poles are located on the flat, circular surfaces. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized through the diameter if your project requires it.

Pros as well as cons of rare earth magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:

Their power is maintained, and after approximately ten years it decreases only by ~1% (theoretically),
They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
Magnets possess impressive magnetic induction on the working surface,
Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
Possibility of exact forming and adjusting to precise requirements,
Universal use in high-tech industry – they are used in mass storage devices, brushless drives, medical devices, as well as technologically advanced constructions.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in compact constructions

Weaknesses

Characteristics of disadvantages of neodymium magnets and ways of using them

Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
Due to limitations in creating threads and complicated shapes in magnets, we propose using a housing - magnetic mechanism.
Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum magnetic pulling force – what contributes to it?

Breakaway force was defined for ideal contact conditions, taking into account:

with the application of a yoke made of low-carbon steel, ensuring full magnetic saturation
possessing a thickness of minimum 10 mm to ensure full flux closure
with an ideally smooth touching surface
with direct contact (no impurities)
under perpendicular application of breakaway force (90-degree angle)
in stable room temperature

Impact of factors on magnetic holding capacity in practice

Holding efficiency is affected by specific conditions, including (from priority):

Clearance – the presence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
Plate texture – smooth surfaces ensure maximum contact, which improves force. Uneven metal weaken the grip.
Thermal environment – temperature increase causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.

Safety rules for work with neodymium magnets

Electronic hazard

Avoid bringing magnets close to a purse, computer, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Crushing risk

Pinching hazard: The attraction force is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.

Combustion hazard

Mechanical processing of NdFeB material poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Operating temperature

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.

Powerful field

Use magnets consciously. Their huge power can surprise even professionals. Stay alert and do not underestimate their power.

Medical interference

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

Beware of splinters

NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets leads to them shattering into shards.

No play value

Absolutely keep magnets away from children. Choking hazard is high, and the effects of magnets clamping inside the body are very dangerous.

Warning for allergy sufferers

Studies show that nickel (the usual finish) is a potent allergen. If you have an allergy, avoid direct skin contact or select versions in plastic housing.

Magnetic interference

GPS units and smartphones are highly sensitive to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Danger! Details about hazards in the article: Magnet Safety Guide.

MW 20x2.5 / N38 - cylindrical magnet

Technical of the product - MW 20x2.5 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the product - report

Table 1: Static pull force (force vs gap) - characteristics MW 20x2.5 / N38

Table 2: Slippage hold (wall) MW 20x2.5 / N38

Table 3: Wall mounting (sliding) - vertical pull MW 20x2.5 / N38

Table 4: Material efficiency (substrate influence) - power losses MW 20x2.5 / N38

Table 5: Working in heat (material behavior) - power drop MW 20x2.5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system MW 20x2.5 / N38

Table 7: Hazards (implants) - warnings MW 20x2.5 / N38

Table 8: Dynamics (kinetic energy) - collision effects MW 20x2.5 / N38

Table 9: Anti-corrosion coating durability MW 20x2.5 / N38

Table 10: Electrical data (Flux) MW 20x2.5 / N38

Table 11: Physics of underwater searching MW 20x2.5 / N38

1. Sliding resistance

2. Plate thickness effect

3. Heat tolerance

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

Material specification

Environmental data

Force (pull)

Field Strength

See also proposals

HH 42x8.8 [M6] / N38 - through hole magnetic holder

MW 15x5 / N38 - cylindrical magnet

CM PML-3 / N45 - magnetic gripper

MPL 40x10x4 / N38 - lamellar magnet

Pros as well as cons of rare earth magnets.

Strengths

Weaknesses

Holding force characteristics

Maximum magnetic pulling force – what contributes to it?

Impact of factors on magnetic holding capacity in practice

Safety rules for work with neodymium magnets

Electronic hazard

Crushing risk

Combustion hazard

Operating temperature

Powerful field

Medical interference

Beware of splinters

No play value

Warning for allergy sufferers

Magnetic interference

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs gap) - characteristics
MW 20x2.5 / N38

Table 2: Slippage hold (wall)
MW 20x2.5 / N38

Table 3: Wall mounting (sliding) - vertical pull
MW 20x2.5 / N38

Table 4: Material efficiency (substrate influence) - power losses
MW 20x2.5 / N38

Table 5: Working in heat (material behavior) - power drop
MW 20x2.5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 20x2.5 / N38

Table 7: Hazards (implants) - warnings
MW 20x2.5 / N38

Table 8: Dynamics (kinetic energy) - collision effects
MW 20x2.5 / N38

Table 9: Anti-corrosion coating durability
MW 20x2.5 / N38

Table 10: Electrical data (Flux)
MW 20x2.5 / N38

Table 11: Physics of underwater searching
MW 20x2.5 / N38