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MW 8x20 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010475

GTIN/EAN: 5906301811138

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

7.54 g

Magnetization Direction

→ diametrical

Load capacity

1.30 kg / 12.71 N

Magnetic Induction

607.01 mT / 6070 Gs

Coating

[NiCuNi] Nickel

4.60 with VAT / pcs + price for transport

3.74 ZŁ net + 23% VAT / pcs

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Technical parameters of the product - MW 8x20 / N38 - cylindrical magnet

Specification / characteristics - MW 8x20 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010475
GTIN/EAN 5906301811138
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 8 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 7.54 g
Magnetization Direction → diametrical
Load capacity ~ ? 1.30 kg / 12.71 N
Magnetic Induction ~ ? 607.01 mT / 6070 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x20 / 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

Technical modeling of the assembly - data

Presented values represent the result of a engineering simulation. Results rely on algorithms for the class Nd2Fe14B. Actual parameters may deviate from the simulation results. Treat these data as a supplementary guide for designers.

Table 1: Static force (force vs gap) - characteristics
MW 8x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6064 Gs
606.4 mT
1.30 kg / 2.87 pounds
1300.0 g / 12.8 N
weak grip
1 mm 4587 Gs
458.7 mT
0.74 kg / 1.64 pounds
743.7 g / 7.3 N
weak grip
2 mm 3327 Gs
332.7 mT
0.39 kg / 0.86 pounds
391.4 g / 3.8 N
weak grip
3 mm 2388 Gs
238.8 mT
0.20 kg / 0.44 pounds
201.6 g / 2.0 N
weak grip
5 mm 1281 Gs
128.1 mT
0.06 kg / 0.13 pounds
58.0 g / 0.6 N
weak grip
10 mm 389 Gs
38.9 mT
0.01 kg / 0.01 pounds
5.4 g / 0.1 N
weak grip
15 mm 169 Gs
16.9 mT
0.00 kg / 0.00 pounds
1.0 g / 0.0 N
weak grip
20 mm 90 Gs
9.0 mT
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
weak grip
30 mm 35 Gs
3.5 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
weak grip
50 mm 10 Gs
1.0 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
weak grip

Table 2: Shear hold (wall)
MW 8x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.26 kg / 0.57 pounds
260.0 g / 2.6 N
1 mm Stal (~0.2) 0.15 kg / 0.33 pounds
148.0 g / 1.5 N
2 mm Stal (~0.2) 0.08 kg / 0.17 pounds
78.0 g / 0.8 N
3 mm Stal (~0.2) 0.04 kg / 0.09 pounds
40.0 g / 0.4 N
5 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 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

Table 3: Wall mounting (shearing) - vertical pull
MW 8x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.39 kg / 0.86 pounds
390.0 g / 3.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.26 kg / 0.57 pounds
260.0 g / 2.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.13 kg / 0.29 pounds
130.0 g / 1.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.65 kg / 1.43 pounds
650.0 g / 6.4 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 8x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.13 kg / 0.29 pounds
130.0 g / 1.3 N
1 mm
25%
0.33 kg / 0.72 pounds
325.0 g / 3.2 N
2 mm
50%
0.65 kg / 1.43 pounds
650.0 g / 6.4 N
3 mm
75%
0.98 kg / 2.15 pounds
975.0 g / 9.6 N
5 mm
100%
1.30 kg / 2.87 pounds
1300.0 g / 12.8 N
10 mm
100%
1.30 kg / 2.87 pounds
1300.0 g / 12.8 N
11 mm
100%
1.30 kg / 2.87 pounds
1300.0 g / 12.8 N
12 mm
100%
1.30 kg / 2.87 pounds
1300.0 g / 12.8 N

Table 5: Working in heat (stability) - thermal limit
MW 8x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.30 kg / 2.87 pounds
1300.0 g / 12.8 N
OK
40 °C -2.2% 1.27 kg / 2.80 pounds
1271.4 g / 12.5 N
OK
60 °C -4.4% 1.24 kg / 2.74 pounds
1242.8 g / 12.2 N
OK
80 °C -6.6% 1.21 kg / 2.68 pounds
1214.2 g / 11.9 N
100 °C -28.8% 0.93 kg / 2.04 pounds
925.6 g / 9.1 N

Table 6: Two magnets (attraction) - forces in the system
MW 8x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 11.40 kg / 25.12 pounds
6 154 Gs
1.71 kg / 3.77 pounds
1709 g / 16.8 N
N/A
1 mm 8.76 kg / 19.31 pounds
10 632 Gs
1.31 kg / 2.90 pounds
1314 g / 12.9 N
7.88 kg / 17.38 pounds
~0 Gs
2 mm 6.52 kg / 14.37 pounds
9 174 Gs
0.98 kg / 2.16 pounds
978 g / 9.6 N
5.87 kg / 12.94 pounds
~0 Gs
3 mm 4.76 kg / 10.49 pounds
7 837 Gs
0.71 kg / 1.57 pounds
714 g / 7.0 N
4.28 kg / 9.44 pounds
~0 Gs
5 mm 2.46 kg / 5.43 pounds
5 637 Gs
0.37 kg / 0.81 pounds
369 g / 3.6 N
2.22 kg / 4.88 pounds
~0 Gs
10 mm 0.51 kg / 1.12 pounds
2 561 Gs
0.08 kg / 0.17 pounds
76 g / 0.7 N
0.46 kg / 1.01 pounds
~0 Gs
20 mm 0.05 kg / 0.10 pounds
778 Gs
0.01 kg / 0.02 pounds
7 g / 0.1 N
0.04 kg / 0.09 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
107 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
69 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
48 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
34 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
25 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
19 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Protective zones (implants) - warnings
MW 8x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.0 cm
Timepiece 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.0 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (kinetic energy) - warning
MW 8x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 13.28 km/h
(3.69 m/s)
0.05 J
30 mm 22.94 km/h
(6.37 m/s)
0.15 J
50 mm 29.61 km/h
(8.23 m/s)
0.26 J
100 mm 41.88 km/h
(11.63 m/s)
0.51 J

Table 9: Anti-corrosion coating durability
MW 8x20 / 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: Electrical data (Flux)
MW 8x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 457 Mx 34.6 µWb
Pc Coefficient 1.31 High (Stable)

Table 11: Hydrostatics and buoyancy
MW 8x20 / N38

Environment Effective steel pull Effect
Air (land) 1.30 kg Standard
Water (riverbed) 1.49 kg
(+0.19 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet retains merely a fraction of its perpendicular strength.

2. Efficiency vs thickness

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.31

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.

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%
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: 010475-2026
Magnet Unit Converter
Pulling force

Field Strength

Other offers

The presented product is an incredibly powerful cylindrical magnet, composed of advanced NdFeB material, which, at dimensions of Ø8x20 mm, guarantees the highest energy density. The MW 8x20 / N38 component features high dimensional repeatability and professional build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 1.30 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring 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 high power of 12.71 N with a weight of only 7.54 g, this cylindrical magnet is indispensable in miniature devices 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., 8.1 mm) using two-component epoxy glues. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø8x20), 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 Ø8x20 mm, which, at a weight of 7.54 g, makes it an element with impressive magnetic energy density. The value of 12.71 N means that the magnet is capable of holding a weight many times exceeding its own mass of 7.54 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 20 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable 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 as well as weaknesses of Nd2Fe14B magnets.

Benefits

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • Their power remains stable, and after around 10 years it decreases only by ~1% (according to research),
  • Magnets effectively resist against loss of magnetization caused by external fields,
  • Thanks to the metallic finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an aesthetic appearance,
  • Magnets are characterized by impressive magnetic induction on the surface,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to flexibility in designing and the capacity to customize to individual projects,
  • Fundamental importance in advanced technology sectors – they find application in mass storage devices, brushless drives, diagnostic systems, and technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Weaknesses

Characteristics of disadvantages of neodymium magnets and ways of using them
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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 rust. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • We recommend casing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Potential hazard resulting from small fragments of magnets are risky, if swallowed, which gains importance in the context of child health protection. It is also worth noting that small components of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

Detachment force of the magnet in optimal conditionswhat contributes to it?

The load parameter shown represents the peak performance, measured under laboratory conditions, meaning:
  • using a sheet made of mild steel, serving as a ideal flux conductor
  • with a cross-section no less than 10 mm
  • characterized by even structure
  • without any insulating layer between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Lifting capacity in practice – influencing factors

Real force is affected by specific conditions, such as (from most important):
  • Air gap (betwixt the magnet and the plate), since even a very small distance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Plate thickness – too thin steel does not accept the full field, causing part of the power to be lost to the other side.
  • Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature influence – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Do not give to children

Product intended for adults. Tiny parts can be swallowed, causing severe trauma. Store out of reach of children and animals.

Risk of cracking

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. Wear goggles.

Combustion hazard

Dust produced during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Phone sensors

Be aware: neodymium magnets produce a field that confuses sensitive sensors. Maintain a separation from your mobile, device, and GPS.

Serious injuries

Danger of trauma: The attraction force is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.

ICD Warning

Warning for patients: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or request help to work with the magnets.

Demagnetization risk

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. The loss of strength is permanent.

Safe operation

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

Sensitization to coating

Nickel alert: The Ni-Cu-Ni coating contains nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.

Electronic hazard

Powerful magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Keep a distance of at least 10 cm.

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