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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

product specifications »

650.01 ZŁ with VAT / pcs + price for transport

528.46 ZŁ net + 23% VAT / pcs

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Technical - 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

Engineering modeling of the assembly - data

These values constitute the direct effect of a engineering analysis. Results are based on models for the class Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Treat these data as a reference point when designing systems.

Table 1: Static force (force vs distance) - characteristics
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
 critical level
1 mm 3143 Gs
314.3 mT
 208.96 kg / 460.68 LBS
208959.6 g / 2049.9 N
 critical level
2 mm 3094 Gs
309.4 mT
 202.53 kg / 446.51 LBS
202531.7 g / 1986.8 N
 critical level
3 mm 3044 Gs
304.4 mT
 195.98 kg / 432.07 LBS
195982.5 g / 1922.6 N
 critical level
5 mm 2939 Gs
293.9 mT
 182.65 kg / 402.68 LBS
182651.7 g / 1791.8 N
 critical level
10 mm 2657 Gs
265.7 mT
 149.35 kg / 329.26 LBS
149349.8 g / 1465.1 N
 critical level
15 mm 2366 Gs
236.6 mT
 118.41 kg / 261.05 LBS
118412.6 g / 1161.6 N
 critical level
20 mm 2081 Gs
208.1 mT
 91.64 kg / 202.03 LBS
91640.5 g / 899.0 N
 critical level
30 mm 1573 Gs
157.3 mT
 52.34 kg / 115.40 LBS
52344.5 g / 513.5 N
 critical level
50 mm 874 Gs
87.4 mT
 16.14 kg / 35.58 LBS
16140.3 g / 158.3 N
 critical level
Pulling power weakens sharply per each millimeter of distance. Keep in mind that even a very thin break (e.g., dirt, varnish, veneer) noticeably weakens the grip. Magnets hold most effectively at the point of direct contact; gap kills the force. See how rapidly the load capacity fall, when the product does not touch tightly to the steel surface. When calculating the mounting, discard additional spacers.

Table 2: Slippage load (wall)
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 presents the approximate force required to start the downward movement of the magnet vertically along a upright metal surface (assuming standard friction). This parameter is relative to 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 element on a upright surface (e.g., a fridge), it will only hold barely about 1/5 of its maximum pull force. Gravitational force and a weak degree of grip cause that holders slip easier than they pop off the substrate. Planning a wall mount? Consider that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the holder will slide down under a much lighter weight. Using a rubber pad can drastically improve the result.

Table 4: Steel thickness (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 thin metal plate is not enough to take in the entire magnetic field, which squanders power of the magnet. Should you install a neodymium to a weak sheet, the magnetism will penetrate right through and the attraction force will be weaker. To squeeze the maximum of this magnet's power, you need a suitably thick backing of metal. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the magnet shows lower pull force. We recommend selecting the steel dimension according to the table below.

Table 5: Thermal resistance (material behavior) - resistance threshold
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 irreversibly lose strength after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's force briefly drops. Do not use this product near heat sources higher than its safe range. Ignoring the limit will result in permanent loss of magnetic properties.
*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) are more susceptible to demagnetization sooner compared to rod magnets. The danger warning in the table points to permanent field degradation for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 magnets interact from a wider radius than a magnet and sheet combination. Such a system of two magnets generates a stronger field and a wider radius of action. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the impact force is huge. The levitation is a bit weaker than the attraction, but still large.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Note: Estimates apply to shear force of dual matching neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - precautionary measures
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
Mobile device 40 Gs (4.0 mT) 21.0 cm
Car key 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
Powerful magnet radiation poses a large risk to electronic devices and pacemakers. These NdFeB products generate a field that destroys function of digital equipment. Remember: the unseen radiation acts through matter and plastic. Increased vigilance must be exercised by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, remotes, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
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 prone to chipping – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely turns into a projectile. Impact energy can cause material chips or painful pinches to fingers. Always hold the magnet during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when playing with large magnets.

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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

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)
Total magnetic flux passing through the magnet pole. Essential parameter in coil applications as well as sensors. Pc value defines the magnet's operating point.

Table 11: Physics of underwater searching
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.
1. Shear force

*Note: On a vertical wall, the magnet retains merely approx. 20-30% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) severely reduces the holding force.

3. Temperature resistance

*For N38 grade, the critical 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.

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: 010002-2026
Magnet Unit Converter
Pulling force
Field Strength
Input your value in a single field to see the conversion for the other units immediately.

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This product is an extremely powerful rod magnet, composed of durable NdFeB material, which, with dimensions of Ø100x30 mm, guarantees optimal power. The MW 100x30 / N38 component features high dimensional repeatability and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 215.17 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 2110.78 N with a weight of only 1767.15 g, this cylindrical magnet 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., 100.1 mm) using two-component epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need even stronger 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 store.
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 protects the surface against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 30 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 diametrically if your project requires it.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Advantages

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
  • They do not lose their magnetic properties even under external field action,
  • A magnet with a shiny nickel surface looks better,
  • Magnetic induction on the top side of the magnet remains strong,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to modularity in shaping and the ability to customize to client solutions,
  • Significant place in innovative solutions – they are utilized in mass storage devices, electromotive mechanisms, medical devices, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in compact constructions

Limitations

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating threads in the magnet and complex shapes - preferred is a housing - magnetic holder.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Detachment force of the magnet in optimal conditions – what it depends on?

The lifting capacity listed is a theoretical maximum value performed under the following configuration:
  • on a base made of mild steel, optimally conducting the magnetic flux
  • with a cross-section of at least 10 mm
  • with an polished touching surface
  • under conditions of gap-free contact (surface-to-surface)
  • during detachment in a direction vertical to the plane
  • in neutral thermal conditions

Magnet lifting force in use – key factors

During everyday use, the actual holding force depends on a number of factors, presented from the most important:
  • Clearance – the presence of foreign body (paint, tape, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
  • Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
  • Temperature – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet and the plate reduces the lifting capacity.

Safe handling of neodymium magnets
Allergic reactions

Medical facts indicate that nickel (standard magnet coating) is a strong allergen. If you have an allergy, prevent touching magnets with bare hands or choose versions in plastic housing.

Threat to electronics

Equipment safety: Strong magnets can damage data carriers and sensitive devices (pacemakers, hearing aids, mechanical watches).

Power loss in heat

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

Medical implants

For implant holders: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Fragile material

Beware of splinters. Magnets can explode upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Fire risk

Fire warning: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.

Threat to navigation

A powerful magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Maintain magnets close to a device to avoid damaging the sensors.

Choking Hazard

Neodymium magnets are not suitable for play. Eating multiple magnets may result in them attracting across intestines, which poses a critical condition and necessitates immediate surgery.

Pinching danger

Large magnets can break fingers in a fraction of a second. Do not put your hand between two attracting surfaces.

Safe operation

Before use, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Security! Details about hazards in the article: Safety of working with magnets.