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MW 20x1.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010039

GTIN: 5906301810384

5.00

Diameter Ø

20 mm [±0,1 mm]

Height

1.5 mm [±0,1 mm]

Weight

3.53 g

Magnetization Direction

↑ axial

Load capacity

0.97 kg / 9.50 N

Magnetic Induction

91.96 mT / 920 Gs

Coating

[NiCuNi] Nickel

1.574 ZŁ with VAT / pcs + price for transport

1.280 ZŁ net + 23% VAT / pcs

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MW 20x1.5 / N38 - cylindrical magnet

Specification / characteristics MW 20x1.5 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010039
GTIN	5906301810384
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	1.5 mm [±0,1 mm]
Weight	3.53 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.97 kg / 9.50 N
Magnetic Induction ~ ?	91.96 mT / 920 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 20x1.5 / N38 - cylindrical magnet

properties	values	units
remenance Br [Min. - Max.] ?	12.2-12.6	kGs
remenance Br [Min. - Max.] ?	1220-1260	T
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 106	°C^-1
Thermal expansion perpendicular (⊥) to orientation (M)	-(1-3) x 10-6	°C^-1
Young's modulus	1.7 x 104	kg/mm²

Technical modeling of the product - technical parameters

Presented data represent the direct effect of a physical simulation. Results rely on models for the material Nd₂Fe₁₄B. Operational conditions might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs distance) - power drop
MW 20x1.5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	920 Gs 92.0 mT	0.97 kg / 970.0 g 9.5 N	safe
1 mm	887 Gs 88.7 mT	0.90 kg / 902.2 g 8.9 N	safe
2 mm	832 Gs 83.2 mT	0.79 kg / 794.6 g 7.8 N	safe
3 mm	763 Gs 76.3 mT	0.67 kg / 667.4 g 6.5 N	safe
5 mm	606 Gs 60.6 mT	0.42 kg / 421.6 g 4.1 N	safe
10 mm	294 Gs 29.4 mT	0.10 kg / 99.5 g 1.0 N	safe
15 mm	144 Gs 14.4 mT	0.02 kg / 23.6 g 0.2 N	safe
20 mm	76 Gs 7.6 mT	0.01 kg / 6.7 g 0.1 N	safe
30 mm	28 Gs 2.8 mT	0.00 kg / 0.9 g 0.0 N	safe
50 mm	7 Gs 0.7 mT	0.00 kg / 0.1 g 0.0 N	safe

Grip strength decreases drastically with every mm of distance. Remember that even the smallest gap (e.g., contamination, paint, dust) significantly diminishes the holding power. Neodymiums hold most effectively in perfect adhesion; air break nullifies the power. See how flashily the pull force fall, when the magnet does not touch directly to the metal substrate. When calculating the assembly, discard redundant distances.

Table 2: Vertical Hold (Wall)
MW 20x1.5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.19 kg / 194.0 g 1.9 N
1 mm	Stal (~0.2)	0.18 kg / 180.0 g 1.8 N
2 mm	Stal (~0.2)	0.16 kg / 158.0 g 1.5 N
3 mm	Stal (~0.2)	0.13 kg / 134.0 g 1.3 N
5 mm	Stal (~0.2)	0.08 kg / 84.0 g 0.8 N
10 mm	Stal (~0.2)	0.02 kg / 20.0 g 0.2 N
15 mm	Stal (~0.2)	0.00 kg / 4.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The following data defines the estimated holding capacity sufficient to initiate the slippage of the magnet downwards on a vertical metal surface (considering typical friction coefficient). This value depends on the distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MW 20x1.5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.29 kg / 291.0 g 2.9 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.19 kg / 194.0 g 1.9 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.10 kg / 97.0 g 1.0 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.49 kg / 485.0 g 4.8 N

When hanging a element on a upright plane (e.g., a board), it you can count on barely approx. 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient cause that magnets move down easier than they detach. Want to create a vertical fastening? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a much lighter cargo. Using a rubber coating can drastically raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MW 20x1.5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.10 kg / 97.0 g 1.0 N
1 mm	25%	0.24 kg / 242.5 g 2.4 N
2 mm	50%	0.49 kg / 485.0 g 4.8 N
5 mm	100%	0.97 kg / 970.0 g 9.5 N
10 mm	100%	0.97 kg / 970.0 g 9.5 N

A too thin steel cannot absorb the full magnetic flux, which wastes potential of the holder. If you attach a powerful product to a too thin substrate, the field will pass right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's power, you require a sufficiently solid element of steel. The saturation phenomenon causes that on sheet metal structures (e.g., thin profiles), the magnet shows lower pull force. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal stability (stability) - power drop
MW 20x1.5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.97 kg / 970.0 g 9.5 N	OK
40 °C	-2.2%	0.95 kg / 948.7 g 9.3 N	OK
60 °C	-4.4%	0.93 kg / 927.3 g 9.1 N
80 °C	-6.6%	0.91 kg / 906.0 g 8.9 N
100 °C	-28.8%	0.69 kg / 690.6 g 6.8 N

Ordinary NdFeB products irreversibly lose power past the thermal threshold. Protect against heat – high temperature can irreversibly damage this product. With every degree above norm, the magnet's capacity momentarily decreases. Do not use this product near heat sources exceeding its safe range. Exceeding the critical threshold will result in permanent loss of magnetic properties.

*Important note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than long magnets. Warning indicator in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MW 20x1.5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	1.64 kg / 1638 g 16.1 N 1 781 Gs	N/A
1 mm	1.59 kg / 1591 g 15.6 N 1 813 Gs	1.43 kg / 1432 g 14.0 N ~0 Gs
2 mm	1.52 kg / 1523 g 14.9 N 1 774 Gs	1.37 kg / 1371 g 13.4 N ~0 Gs
3 mm	1.44 kg / 1439 g 14.1 N 1 724 Gs	1.29 kg / 1295 g 12.7 N ~0 Gs
5 mm	1.24 kg / 1236 g 12.1 N 1 598 Gs	1.11 kg / 1113 g 10.9 N ~0 Gs
10 mm	0.71 kg / 712 g 7.0 N 1 212 Gs	0.64 kg / 641 g 6.3 N ~0 Gs
20 mm	0.17 kg / 168 g 1.6 N 589 Gs	0.15 kg / 151 g 1.5 N ~0 Gs
50 mm	0.00 kg / 4 g 0.0 N 88 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnetic products interact from a much further distance than a neodymium and metal setup. The connection of two magnets generates a stronger field and a wider radius of operation. Planning to create a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is massive. The levitation is a bit weaker than the attraction, but still large.
*Field value for N-N configuration drops to ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 20x1.5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	6.0 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

A strong magnetic field is a large risk to electronic devices and medical implants. These neodymiums produce a field that destroys function of sensitive medical devices. Notice: the unseen radiation acts through matter and housings. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, remotes, membranes, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MW 20x1.5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	17.76 km/h (4.93 m/s)	0.04 J
30 mm	28.97 km/h (8.05 m/s)	0.11 J
50 mm	37.38 km/h (10.38 m/s)	0.19 J
100 mm	52.87 km/h (14.69 m/s)	0.38 J

Magnetic elements are prone to chipping – a collision with steel causes immediate chipping. Watch the impact speed – a magnet released freely becomes dangerous. Impact energy can cause material chips or injury to skin. Always hold the magnet during installation so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Surface protection spec
MW 20x1.5 / 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)

The following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Flux)
MW 20x1.5 / N38

Parameter	Value	Jedn. SI / Opis
Strumień (Flux)	3 979 Mx	39.8 µWb
Współczynnik Pc	0.12	Niski (Płaski)

Flux value emitted by the pole face. Essential parameter for motor design and sensors. Pc Factor defines the working geometry.

Table 11: Submerged application
MW 20x1.5 / N38

Environment	Effective steel pull	Effect
Air (land)	0.97 kg	Standard
Water (riverbed)	1.11 kg (+0.14 kg Buoyancy gain)	+14.5%

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

The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Sliding resistance

*Note: On a vertical surface, the magnet retains only approx. 20-30% of its nominal pull.

2. Plate thickness effect

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

3. Heat tolerance

*For N38 material, the safety limit is 80°C.

Quick Unit Converter

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MW 7x2 / N38 - cylindrical magnet

0.381 ZŁ brutto / pcs

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SM 18x250 [2xM5] / N42 - magnetic separator

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This product is a very strong cylindrical magnet, composed of modern NdFeB material, which, at dimensions of Ø20x1.5 mm, guarantees optimal power. This specific item features a tolerance of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 0.97 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.

It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 9.50 N with a weight of only 3.53 g, this rod is indispensable in miniature devices and wherever low weight is crucial.

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 two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.

Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and operational stability. If you need the strongest magnets in the same volume (Ø20x1.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.

The presented product is a neodymium magnet with precisely defined parameters: diameter 20 mm and height 1.5 mm. The key parameter here is the holding force amounting to approximately 0.97 kg (force ~9.50 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.

Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 20 mm. 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 and cons of neodymium magnets.

Advantages

Besides their tremendous field intensity, neodymium magnets offer the following advantages:

Their power remains stable, and after approximately 10 years it decreases only by ~1% (theoretically),
Neodymium magnets prove to be highly resistant to demagnetization caused by external magnetic fields,
Thanks to the metallic finish, the coating of nickel, gold-plated, or silver-plated gives an elegant appearance,
Neodymium magnets create maximum magnetic induction on a contact point, which ensures high operational effectiveness,
Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
Thanks to versatility in designing and the capacity to customize to individual projects,
Universal use in modern technologies – they are utilized in HDD drives, electric motors, medical devices, as well as industrial machines.
Thanks to their power density, small magnets offer high operating force, with minimal size,

Weaknesses

Cons of neodymium magnets: tips and applications.

They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
Limited ability of creating nuts in the magnet and complex shapes - recommended is casing - magnet mounting.
Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these devices can complicate diagnosis medical in case of swallowing.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The load parameter shown refers to the limit force, obtained under laboratory conditions, meaning:

on a base made of mild steel, optimally conducting the magnetic flux
with a cross-section minimum 10 mm
characterized by smoothness
with direct contact (no coatings)
for force acting at a right angle (in the magnet axis)
at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Effective lifting capacity is affected by working environment parameters, such as (from priority):

Space between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
Base massiveness – insufficiently thick steel does not accept the full field, causing part of the flux to be escaped to the other side.
Steel grade – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
Surface finish – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet and the plate decreases the load capacity.

Safety rules for work with neodymium magnets

Thermal limits

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its properties and strength.

Safe distance

Avoid bringing magnets near a purse, computer, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Danger to pacemakers

Individuals with a ICD must keep an safe separation from magnets. The magnetism can interfere with the operation of the life-saving device.

Keep away from electronics

Note: neodymium magnets generate a field that interferes with sensitive sensors. Maintain a separation from your phone, tablet, and navigation systems.

Do not drill into magnets

Drilling and cutting of NdFeB material carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Shattering risk

Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Caution required

Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.

Bone fractures

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

Choking Hazard

NdFeB magnets are not intended for children. Eating multiple magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and necessitates immediate surgery.

Skin irritation risks

A percentage of the population suffer from a sensitization to Ni, which is the common plating for NdFeB magnets. Extended handling can result in skin redness. We strongly advise use safety gloves.

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

MW 20x1.5 / N38 - cylindrical magnet

Need advice?

MW 20x1.5 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the product - technical parameters

1. Sliding resistance

2. Plate thickness effect

3. Heat tolerance

Force (Pull)

Magnetic Induction

See also offers

MW 7x2 / N38 - cylindrical magnet

SM 32x400 [2xM8] / N52 - magnetic separator

BM 850x180x70 [4x M8] - magnetic beam

SM 18x250 [2xM5] / N42 - magnetic separator

Pros and cons of neodymium magnets.

Advantages

Weaknesses

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what contributes to it?

What influences lifting capacity in practice

Thermal limits

Safe distance

Danger to pacemakers

Keep away from electronics

Do not drill into magnets

Shattering risk

Caution required

Bone fractures

Choking Hazard

Skin irritation risks

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C