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MW 100x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010002

GTIN/EAN: 5906301810025

5.00
Load capacity 215.17 kg / 2110.78 N Magnetic Induction 318.96 mT / 3190 Gs
Diameter Ø
100 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
1767.15 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

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528.46 zł net + 23% VAT / pcs

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical specification of the product - 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

Technical modeling of the assembly - technical parameters

The following values constitute the outcome of a physical simulation. Results are based on models for the class Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Please consider these data as a supplementary guide when designing systems.

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
dangerous!
1 mm 3143 Gs
314.3 mT
208.96 kg / 460.68 LBS
208959.6 g / 2049.9 N
dangerous!
2 mm 3094 Gs
309.4 mT
202.53 kg / 446.51 LBS
202531.7 g / 1986.8 N
dangerous!
3 mm 3044 Gs
304.4 mT
195.98 kg / 432.07 LBS
195982.5 g / 1922.6 N
dangerous!
5 mm 2939 Gs
293.9 mT
182.65 kg / 402.68 LBS
182651.7 g / 1791.8 N
dangerous!
10 mm 2657 Gs
265.7 mT
149.35 kg / 329.26 LBS
149349.8 g / 1465.1 N
dangerous!
15 mm 2366 Gs
236.6 mT
118.41 kg / 261.05 LBS
118412.6 g / 1161.6 N
dangerous!
20 mm 2081 Gs
208.1 mT
91.64 kg / 202.03 LBS
91640.5 g / 899.0 N
dangerous!
30 mm 1573 Gs
157.3 mT
52.34 kg / 115.40 LBS
52344.5 g / 513.5 N
dangerous!
50 mm 874 Gs
87.4 mT
16.14 kg / 35.58 LBS
16140.3 g / 158.3 N
dangerous!

Table 2: Shear 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

Table 3: Wall mounting (sliding) - vertical pull
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

Table 4: Material efficiency (substrate influence) - 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

Table 5: Thermal resistance (stability) - power drop
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

Table 6: Two magnets (attraction) - field range
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

Table 7: Safety (HSE) (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
Timepiece 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

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.21 km/h
(4.50 m/s)
17.91 J
30 mm 23.14 km/h
(6.43 m/s)
36.50 J
50 mm 24.98 km/h
(6.94 m/s)
42.54 J
100 mm 25.76 km/h
(7.16 m/s)
45.24 J

Table 9: Coating parameters (durability)
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)

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

Parameter Value SI Unit / Description
Magnetic Flux 269 425 Mx 2694.3 µWb
Pc Coefficient 0.40 Low (Flat)

Table 11: Underwater work (magnet fishing)
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

1. Wall mount (shear)

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

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) drastically weakens the holding force.

3. Thermal stability

*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

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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
Measurement Calculator

Pulling force


Magnetic Field

See also offers

The presented product is an exceptionally strong cylindrical magnet, composed of durable NdFeB material, which, at dimensions of Ø100x30 mm, guarantees the highest energy density. The MW 100x30 / N38 model boasts high dimensional repeatability and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 215.17 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 2110.78 N with a weight of only 1767.15 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, 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 long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for 90% of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. 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 available off-the-shelf in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 100 mm and height 30 mm. 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 oxidation, 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. 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.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Benefits

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
  • They are extremely resistant to demagnetization induced by external magnetic fields,
  • In other words, due to the glossy finish of gold, the element gains a professional look,
  • The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to the ability of free molding and adaptation to unique needs, NdFeB magnets can be created in a variety of shapes and sizes, which expands the range of possible applications,
  • Huge importance in advanced technology sectors – they serve a role in hard drives, electric motors, medical equipment, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in miniature devices

Cons

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • 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, when using outdoors
  • Due to limitations in creating nuts and complicated shapes in magnets, we propose using casing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum magnetic pulling forcewhat contributes to it?

The load parameter shown refers to the peak performance, measured under ideal test conditions, namely:
  • using a sheet made of mild steel, functioning as a magnetic yoke
  • with a cross-section no less than 10 mm
  • with a plane cleaned and smooth
  • with total lack of distance (without paint)
  • under axial force vector (90-degree angle)
  • at ambient temperature room level

Magnet lifting force in use – key factors

Holding efficiency is influenced by specific conditions, including (from priority):
  • Gap (betwixt the magnet and the plate), as even a very small distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content reduce magnetic properties and holding force.
  • Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate decreases the load capacity.

Safe handling of NdFeB magnets
Magnetic media

Intense magnetic fields can destroy records on payment cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Magnets are brittle

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

Thermal limits

Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. This process is irreversible.

Choking Hazard

Neodymium magnets are not toys. Accidental ingestion of several magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and necessitates immediate surgery.

Phone sensors

Note: rare earth magnets produce a field that confuses precision electronics. Keep a separation from your mobile, device, and GPS.

Sensitization to coating

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction happens, immediately stop handling magnets and use protective gear.

Combustion hazard

Combustion risk: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.

Crushing force

Pinching hazard: The attraction force is so great that it can cause blood blisters, pinching, and broken bones. Use thick gloves.

Implant safety

For implant holders: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or request help to handle the magnets.

Safe operation

Be careful. Rare earth magnets act from a distance and snap with huge force, often quicker than you can move away.

Caution! Looking for details? Read our article: Are neodymium magnets dangerous?