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MW 20x1.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010039

GTIN/EAN: 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 with VAT / pcs + price for transport

1.280 ZŁ net + 23% VAT / pcs

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Physical properties - MW 20x1.5 / N38 - cylindrical magnet

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

properties
properties values
Cat. no. 010039
GTIN/EAN 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 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Physical simulation of the magnet - data

These data constitute the outcome of a physical simulation. Values are based on algorithms for the class Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Treat these data as a preliminary roadmap for designers.

Table 1: Static force (pull vs gap) - characteristics
MW 20x1.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 920 Gs
92.0 mT
0.97 kg / 2.14 lbs
970.0 g / 9.5 N
low risk
1 mm 887 Gs
88.7 mT
0.90 kg / 1.99 lbs
902.2 g / 8.9 N
low risk
2 mm 832 Gs
83.2 mT
0.79 kg / 1.75 lbs
794.6 g / 7.8 N
low risk
3 mm 763 Gs
76.3 mT
0.67 kg / 1.47 lbs
667.4 g / 6.5 N
low risk
5 mm 606 Gs
60.6 mT
0.42 kg / 0.93 lbs
421.6 g / 4.1 N
low risk
10 mm 294 Gs
29.4 mT
0.10 kg / 0.22 lbs
99.5 g / 1.0 N
low risk
15 mm 144 Gs
14.4 mT
0.02 kg / 0.05 lbs
23.6 g / 0.2 N
low risk
20 mm 76 Gs
7.6 mT
0.01 kg / 0.01 lbs
6.7 g / 0.1 N
low risk
30 mm 28 Gs
2.8 mT
0.00 kg / 0.00 lbs
0.9 g / 0.0 N
low risk
50 mm 7 Gs
0.7 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
low risk

Table 2: Slippage hold (wall)
MW 20x1.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.19 kg / 0.43 lbs
194.0 g / 1.9 N
1 mm Stal (~0.2) 0.18 kg / 0.40 lbs
180.0 g / 1.8 N
2 mm Stal (~0.2) 0.16 kg / 0.35 lbs
158.0 g / 1.5 N
3 mm Stal (~0.2) 0.13 kg / 0.30 lbs
134.0 g / 1.3 N
5 mm Stal (~0.2) 0.08 kg / 0.19 lbs
84.0 g / 0.8 N
10 mm Stal (~0.2) 0.02 kg / 0.04 lbs
20.0 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
2.0 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

Table 3: Wall mounting (shearing) - vertical pull
MW 20x1.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.29 kg / 0.64 lbs
291.0 g / 2.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.19 kg / 0.43 lbs
194.0 g / 1.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.10 kg / 0.21 lbs
97.0 g / 1.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.49 kg / 1.07 lbs
485.0 g / 4.8 N

Table 4: Material efficiency (saturation) - sheet metal selection
MW 20x1.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.10 kg / 0.21 lbs
97.0 g / 1.0 N
1 mm
25%
0.24 kg / 0.53 lbs
242.5 g / 2.4 N
2 mm
50%
0.49 kg / 1.07 lbs
485.0 g / 4.8 N
3 mm
75%
0.73 kg / 1.60 lbs
727.5 g / 7.1 N
5 mm
100%
0.97 kg / 2.14 lbs
970.0 g / 9.5 N
10 mm
100%
0.97 kg / 2.14 lbs
970.0 g / 9.5 N
11 mm
100%
0.97 kg / 2.14 lbs
970.0 g / 9.5 N
12 mm
100%
0.97 kg / 2.14 lbs
970.0 g / 9.5 N

Table 5: Working in heat (material behavior) - power drop
MW 20x1.5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.97 kg / 2.14 lbs
970.0 g / 9.5 N
OK
40 °C -2.2% 0.95 kg / 2.09 lbs
948.7 g / 9.3 N
OK
60 °C -4.4% 0.93 kg / 2.04 lbs
927.3 g / 9.1 N
80 °C -6.6% 0.91 kg / 2.00 lbs
906.0 g / 8.9 N
100 °C -28.8% 0.69 kg / 1.52 lbs
690.6 g / 6.8 N

Table 6: Two magnets (repulsion) - forces in the system
MW 20x1.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.64 kg / 3.61 lbs
1 781 Gs
0.25 kg / 0.54 lbs
246 g / 2.4 N
N/A
1 mm 1.59 kg / 3.51 lbs
1 813 Gs
0.24 kg / 0.53 lbs
239 g / 2.3 N
1.43 kg / 3.16 lbs
~0 Gs
2 mm 1.52 kg / 3.36 lbs
1 774 Gs
0.23 kg / 0.50 lbs
228 g / 2.2 N
1.37 kg / 3.02 lbs
~0 Gs
3 mm 1.44 kg / 3.17 lbs
1 724 Gs
0.22 kg / 0.48 lbs
216 g / 2.1 N
1.29 kg / 2.85 lbs
~0 Gs
5 mm 1.24 kg / 2.73 lbs
1 598 Gs
0.19 kg / 0.41 lbs
185 g / 1.8 N
1.11 kg / 2.45 lbs
~0 Gs
10 mm 0.71 kg / 1.57 lbs
1 212 Gs
0.11 kg / 0.24 lbs
107 g / 1.0 N
0.64 kg / 1.41 lbs
~0 Gs
20 mm 0.17 kg / 0.37 lbs
589 Gs
0.03 kg / 0.06 lbs
25 g / 0.2 N
0.15 kg / 0.33 lbs
~0 Gs
50 mm 0.00 kg / 0.01 lbs
88 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
55 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
36 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
25 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
18 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

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
Car key 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

Table 8: Dynamics (cracking risk) - warning
MW 20x1.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
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

Table 9: Anti-corrosion coating durability
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)

Table 10: Construction data (Pc)
MW 20x1.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 979 Mx 39.8 µWb
Pc Coefficient 0.12 Low (Flat)

Table 11: Physics of underwater searching
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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Vertical hold

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Temperature resistance

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.12

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 Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Engineering data and GPSR
Chemical composition
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: 010039-2026
Quick Unit Converter
Force (pull)

Magnetic Induction

Other offers

This product is an incredibly powerful cylinder magnet, produced from modern NdFeB material, which, at dimensions of Ø20x1.5 mm, guarantees the highest energy density. The MW 20x1.5 / N38 component features an accuracy of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 0.97 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 9.50 N with a weight of only 3.53 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure stability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are suitable for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. 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 available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø20x1.5 mm, which, at a weight of 3.53 g, makes it an element with impressive magnetic energy density. The value of 9.50 N means that the magnet is capable of holding a weight many times exceeding its own mass of 3.53 g. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 1.5 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized through the diameter if your project requires it.

Strengths and weaknesses of rare earth magnets.

Pros

Apart from their notable power, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (in laboratory conditions),
  • They do not lose their magnetic properties even under external field action,
  • Thanks to the smooth finish, the surface of nickel, gold, or silver gives an professional appearance,
  • Magnetic induction on the surface of the magnet is exceptional,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • Thanks to versatility in shaping and the capacity to modify to client solutions,
  • Significant place in innovative solutions – they are utilized in HDD drives, motor assemblies, precision medical tools, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in miniature devices

Weaknesses

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.
  • Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in creating threads and complicated forms in magnets, we recommend using a housing - magnetic mechanism.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Magnetic strength at its maximum – what it depends on?

The load parameter shown refers to the limit force, measured under optimal environment, specifically:
  • with the use of a sheet made of special test steel, ensuring maximum field concentration
  • with a thickness no less than 10 mm
  • with an ground contact surface
  • with total lack of distance (no coatings)
  • for force acting at a right angle (pull-off, not shear)
  • at ambient temperature room level

Magnet lifting force in use – key factors

It is worth knowing that the magnet holding may be lower influenced by elements below, starting with the most relevant:
  • Distance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material composition – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
  • Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was determined by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets
Material brittleness

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Do not give to children

Product intended for adults. Small elements pose a choking risk, leading to intestinal necrosis. Keep out of reach of children and animals.

Health Danger

People with a heart stimulator have to maintain an safe separation from magnets. The magnetism can disrupt the operation of the implant.

Safe distance

Very strong magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Skin irritation risks

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If redness happens, immediately stop handling magnets and wear gloves.

Dust is flammable

Powder produced during grinding of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Powerful field

Before starting, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Pinching danger

Large magnets can smash fingers in a fraction of a second. Do not put your hand between two strong magnets.

Impact on smartphones

GPS units and mobile phones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Operating temperature

Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.

Safety First! Want to know more? Read our article: Why are neodymium magnets dangerous?