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MW 100x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010002

GTIN/EAN: 5906301810025

5.00

Diameter Ø

100 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

1767.15 g

Magnetization Direction

↑ axial

Load capacity

215.17 kg / 2110.78 N

Magnetic Induction

318.96 mT / 3190 Gs

Coating

[NiCuNi] Nickel

technical details »

650.01 ZŁ with VAT / pcs + price for transport

528.46 ZŁ net + 23% VAT / pcs

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Technical specification - MW 100x30 / N38 - cylindrical magnet

Specification / characteristics - MW 100x30 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010002
GTIN/EAN 5906301810025
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 100 mm [±0,1 mm]
Height 30 mm [±0,1 mm]
Weight 1767.15 g
Magnetization Direction ↑ axial
Load capacity ~ ? 215.17 kg / 2110.78 N
Magnetic Induction ~ ? 318.96 mT / 3190 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 100x30 / 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 modeling of the assembly - data

These values are the outcome of a engineering calculation. Values rely on algorithms for the class Nd2Fe14B. Actual performance may deviate from the simulation results. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs gap) - interaction chart
MW 100x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3189 Gs
318.9 mT
 215.17 kg / 474.37 lbs
215170.0 g / 2110.8 N
 crushing
1 mm 3143 Gs
314.3 mT
 208.96 kg / 460.68 lbs
208959.6 g / 2049.9 N
 crushing
2 mm 3094 Gs
309.4 mT
 202.53 kg / 446.51 lbs
202531.7 g / 1986.8 N
 crushing
3 mm 3044 Gs
304.4 mT
 195.98 kg / 432.07 lbs
195982.5 g / 1922.6 N
 crushing
5 mm 2939 Gs
293.9 mT
 182.65 kg / 402.68 lbs
182651.7 g / 1791.8 N
 crushing
10 mm 2657 Gs
265.7 mT
 149.35 kg / 329.26 lbs
149349.8 g / 1465.1 N
 crushing
15 mm 2366 Gs
236.6 mT
 118.41 kg / 261.05 lbs
118412.6 g / 1161.6 N
 crushing
20 mm 2081 Gs
208.1 mT
 91.64 kg / 202.03 lbs
91640.5 g / 899.0 N
 crushing
30 mm 1573 Gs
157.3 mT
 52.34 kg / 115.40 lbs
52344.5 g / 513.5 N
 crushing
50 mm 874 Gs
87.4 mT
 16.14 kg / 35.58 lbs
16140.3 g / 158.3 N
 crushing
Pulling power weakens significantly with every mm of distance. Remember that even a very thin break (e.g., contamination, paint, rust) strongly reduces the pull force. Neodymiums hold optimally during direct contact; distance drastically cuts the force. Analyze how rapidly the parameters fall, when the magnet does not adhere tightly to the steel surface. When calculating the mounting, eliminate additional spacers.

Table 2: Slippage force (vertical surface)
MW 100x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 43.03 kg / 94.87 lbs
43034.0 g / 422.2 N
1 mm Stal (~0.2) 41.79 kg / 92.14 lbs
41792.0 g / 410.0 N
2 mm Stal (~0.2) 40.51 kg / 89.30 lbs
40506.0 g / 397.4 N
3 mm Stal (~0.2) 39.20 kg / 86.41 lbs
39196.0 g / 384.5 N
5 mm Stal (~0.2) 36.53 kg / 80.53 lbs
36530.0 g / 358.4 N
10 mm Stal (~0.2) 29.87 kg / 65.85 lbs
29870.0 g / 293.0 N
15 mm Stal (~0.2) 23.68 kg / 52.21 lbs
23682.0 g / 232.3 N
20 mm Stal (~0.2) 18.33 kg / 40.41 lbs
18328.0 g / 179.8 N
30 mm Stal (~0.2) 10.47 kg / 23.08 lbs
10468.0 g / 102.7 N
50 mm Stal (~0.2) 3.23 kg / 7.12 lbs
3228.0 g / 31.7 N
The following data shows the estimated holding capacity necessary to start the sliding of the magnet vertically against a upright metal surface (considering standard friction coefficient). This value is a function of the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 100x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
64.55 kg / 142.31 lbs
64551.0 g / 633.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
43.03 kg / 94.87 lbs
43034.0 g / 422.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
21.52 kg / 47.44 lbs
21517.0 g / 211.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
107.59 kg / 237.18 lbs
107585.0 g / 1055.4 N
When placing a holder on a upright plane (e.g., a board), it will only hold barely approx. 20%-30% of its nominal power. Gravity as well as a low friction coefficient cause that magnets slide down easier than they detach. Planning a hanger? Remember that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the holder will slide down under a much lighter weight. Utilizing a rubberized layer can drastically improve the result.

Table 4: Material efficiency (saturation) - power losses
MW 100x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 7.17 kg / 15.81 lbs
7172.3 g / 70.4 N
1 mm
8%
 17.93 kg / 39.53 lbs
17930.8 g / 175.9 N
2 mm
17%
 35.86 kg / 79.06 lbs
35861.7 g / 351.8 N
3 mm
25%
 53.79 kg / 118.59 lbs
53792.5 g / 527.7 N
5 mm
42%
 89.65 kg / 197.65 lbs
89654.2 g / 879.5 N
10 mm
83%
 179.31 kg / 395.31 lbs
179308.3 g / 1759.0 N
11 mm
92%
 197.24 kg / 434.84 lbs
197239.2 g / 1934.9 N
12 mm
100%
 215.17 kg / 474.37 lbs
215170.0 g / 2110.8 N
A too thin steel is incapable of conduct the full magnetic flux, which weakens actual performance of the holder. If you attach a powerful product to a thin surface, the flux will penetrate right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's potential, you need a suitably thick element of metal. The material oversaturation means that on sheet metal structures (e.g., appliance housings), the holder works worse. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal resistance (stability) - thermal limit
MW 100x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 215.17 kg / 474.37 lbs
215170.0 g / 2110.8 N
 OK
40 °C -2.2% 210.44 kg / 463.93 lbs
210436.3 g / 2064.4 N
 OK
60 °C -4.4% 205.70 kg / 453.50 lbs
205702.5 g / 2017.9 N
80 °C -6.6% 200.97 kg / 443.06 lbs
200968.8 g / 1971.5 N
100 °C -28.8% 153.20 kg / 337.75 lbs
153201.0 g / 1502.9 N
Standard neodymium magnets lose strength above the temperature limit. Protect against heat – high temperature can irreversibly demagnetize this magnet. As the temperature rises, the magnet's capacity briefly drops. Refrain from using this product close to heaters exceeding its working range. Ignoring the limit will cause destruction of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) may lose charge permanently sooner than long magnets. The danger warning in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 100x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 492.55 kg / 1085.88 lbs
4 762 Gs
73.88 kg / 162.88 lbs
73882 g / 724.8 N
 N/A
1 mm 485.56 kg / 1070.47 lbs
6 333 Gs
72.83 kg / 160.57 lbs
72834 g / 714.5 N
 437.00 kg / 963.42 lbs
~0 Gs
2 mm 478.33 kg / 1054.54 lbs
6 286 Gs
71.75 kg / 158.18 lbs
71749 g / 703.9 N
 430.50 kg / 949.08 lbs
~0 Gs
3 mm 471.01 kg / 1038.40 lbs
6 238 Gs
70.65 kg / 155.76 lbs
70652 g / 693.1 N
 423.91 kg / 934.56 lbs
~0 Gs
5 mm 456.15 kg / 1005.64 lbs
6 139 Gs
68.42 kg / 150.85 lbs
68422 g / 671.2 N
 410.53 kg / 905.07 lbs
~0 Gs
10 mm 418.11 kg / 921.77 lbs
5 877 Gs
62.72 kg / 138.27 lbs
62716 g / 615.2 N
 376.30 kg / 829.59 lbs
~0 Gs
20 mm 341.88 kg / 753.71 lbs
5 314 Gs
51.28 kg / 113.06 lbs
51282 g / 503.1 N
 307.69 kg / 678.34 lbs
~0 Gs
50 mm 159.49 kg / 351.61 lbs
3 630 Gs
23.92 kg / 52.74 lbs
23923 g / 234.7 N
 143.54 kg / 316.45 lbs
~0 Gs
60 mm 119.82 kg / 264.16 lbs
3 146 Gs
17.97 kg / 39.62 lbs
17973 g / 176.3 N
 107.84 kg / 237.75 lbs
~0 Gs
70 mm 89.40 kg / 197.09 lbs
2 718 Gs
13.41 kg / 29.56 lbs
13410 g / 131.6 N
 80.46 kg / 177.38 lbs
~0 Gs
80 mm 66.51 kg / 146.64 lbs
2 344 Gs
9.98 kg / 22.00 lbs
9977 g / 97.9 N
 59.86 kg / 131.97 lbs
~0 Gs
90 mm 49.50 kg / 109.14 lbs
2 022 Gs
7.43 kg / 16.37 lbs
7426 g / 72.8 N
 44.55 kg / 98.22 lbs
~0 Gs
100 mm 36.95 kg / 81.45 lbs
1 747 Gs
5.54 kg / 12.22 lbs
5542 g / 54.4 N
 33.25 kg / 73.31 lbs
~0 Gs
Two magnetic products attract each other from a much further distance than a neodymium and metal setup. Such a system of magnet-to-magnet produces a massive flux and a wider radius of action. Planning to create a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the collision energy is massive. The levitation is slightly lower than the connection force, but still large.
*Field value for N-N configuration drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Attention: Results demonstrate shear force of two matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - warnings
MW 100x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 44.0 cm
Hearing aid 10 Gs (1.0 mT) 34.5 cm
Mechanical watch 20 Gs (2.0 mT) 27.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 21.0 cm
Remote 50 Gs (5.0 mT) 19.0 cm
Payment card 400 Gs (40.0 mT) 8.0 cm
HDD hard drive 600 Gs (60.0 mT) 6.5 cm
A strong magnetic field is a serious hazard to electronic devices as well as pacemakers. These magnets produce a flux that prevents correct functioning of digital equipment. Remember: the invisible magnetic field penetrates the body and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
MW 100x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 15.21 km/h
(4.22 m/s)
 15.77 J
30 mm 22.01 km/h
(6.11 m/s)
 33.03 J
50 mm 26.02 km/h
(7.23 m/s)
 46.17 J
100 mm 35.32 km/h
(9.81 m/s)
 85.04 J
NdFeB products are very brittle – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or dangerous crushing to fingers. Hold the magnet firmly during installation so it doesn't slam with momentum against the steel surface. A collision at high speed ends with a crack of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Corrosion resistance
MW 100x30 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MW 100x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 269 425 Mx 2694.3 µWb
Pc Coefficient 0.40 Low (Flat)
Flux value passing through the magnet pole. Essential parameter when building generators and motors. Pc value determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MW 100x30 / N38

Environment Effective steel pull Effect
Air (land) 215.17 kg Standard
Water (riverbed) 246.37 kg
(+31.20 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Warning: On a vertical surface, the magnet retains only ~20% of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.40

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 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: 010002-2026
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The offered product is an exceptionally strong cylindrical magnet, composed of durable NdFeB material, which, with dimensions of Ø100x30 mm, guarantees optimal power. The MW 100x30 / N38 component is characterized by high dimensional repeatability and professional build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 215.17 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created 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 2110.78 N with a weight of only 1767.15 g, this rod is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 100.1 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 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 (Ø100x30), 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 Ø100x30 mm, which, at a weight of 1767.15 g, makes it an element with impressive magnetic energy density. The value of 2110.78 N means that the magnet is capable of holding a weight many times exceeding its own mass of 1767.15 g. The product has a [NiCuNi] coating, which secures it against oxidation, 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 100 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 diametrically if your project requires it.

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • Their strength is durable, and after approximately ten years it decreases only by ~1% (according to research),
  • They retain their magnetic properties even under strong external field,
  • A magnet with a metallic nickel surface has better aesthetics,
  • Magnetic induction on the top side of the magnet turns out to be exceptional,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
  • Due to the option of precise shaping and adaptation to custom requirements, NdFeB magnets can be created in a variety of geometric configurations, which expands the range of possible applications,
  • Versatile presence in modern technologies – they serve a role in magnetic memories, drive modules, medical equipment, as well as technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest casing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Additionally, small components of these devices can complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

The force parameter is a theoretical maximum value conducted under specific, ideal conditions:
  • on a base made of mild steel, effectively closing the magnetic flux
  • whose transverse dimension reaches at least 10 mm
  • characterized by even structure
  • under conditions of ideal adhesion (surface-to-surface)
  • during pulling in a direction vertical to the mounting surface
  • at temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

In real-world applications, the real power depends on a number of factors, ranked from most significant:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick steel causes magnetic saturation, causing part of the power to be wasted into the air.
  • Material composition – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Holding force was checked 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 slight gap between the magnet’s surface and the plate decreases the holding force.

Safety rules for work with NdFeB magnets
Serious injuries

Big blocks can break fingers instantly. Under no circumstances put your hand betwixt two attracting surfaces.

Threat to electronics

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

Heat sensitivity

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Magnetic interference

A powerful magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Do not bring magnets close to a device to prevent breaking the sensors.

Machining danger

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

Medical interference

Individuals with a pacemaker have to keep an safe separation from magnets. The magnetism can stop the functioning of the implant.

Nickel allergy

It is widely known that the nickel plating (the usual finish) is a strong allergen. If your skin reacts to metals, refrain from touching magnets with bare hands and choose versions in plastic housing.

Eye protection

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.

Do not give to children

Neodymium magnets are not toys. Swallowing several magnets may result in them connecting inside the digestive tract, which poses a critical condition and requires immediate surgery.

Handling rules

Use magnets with awareness. Their immense force can shock even professionals. Be vigilant and respect their force.

Warning! Want to know more? Check our post: Why are neodymium magnets dangerous?