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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

check specifications »

650.01 ZŁ with VAT / pcs + price for transport

528.46 ZŁ net + 23% VAT / pcs

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Technical details - 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 simulation of the assembly - report

These values constitute the direct effect of a engineering calculation. Results rely on models for the class Nd2Fe14B. Actual parameters might slightly differ. Please consider these data as a preliminary roadmap when designing systems.

Table 1: Static pull 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
 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!
Pulling power decreases drastically per each millimeter of gap. Remember that even a microscopic distance (e.g., dirt, varnish, rust) noticeably reduces the pull force. Neodymiums hold strongest at the point of direct contact; distance weakens the force. See how quickly the load capacity plummet, when the magnet does not adhere directly to the steel surface. When calculating the assembly, avoid redundant distances.

Table 2: Shear hold (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 indicates the theoretical shear load needed to cause the downward movement of the magnet downwards on a vertical metal surface (assuming standard friction coefficient). This value depends on the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - 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 hanging a magnet on a upright plane (e.g., a fridge), it will only hold only about 20%-30% of nominal attraction strength. Gravitational force as well as a weak degree of grip influence the fact that magnets slide down easier than they pull off. Planning a vertical fastening? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a smooth steel, the magnet will slide down under a significantly smaller load. Utilizing a rubberized pad can effectively increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
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 not enough to focus the entire magnetic field, which squanders power of the holder. If you mount a strong magnet to a weak sheet, the field will penetrate right through and the pull force will drop sharply. To achieve 100% of this magnet's potential, you need a suitably thick element of steel. The material oversaturation means that on sheet metal structures (e.g., car bodies), the holder shows lower pull force. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal resistance (material behavior) - 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
Ordinary NdFeB products change their properties strength after exceeding the maximum temperature. Watch out for overheating – high temperature can irreversibly damage this magnet. As the temperature rises, the neodymium's capacity momentarily lowers. Avoid using this product close to ovens exceeding its operating temperature limit. Exceeding the critical threshold will lead to permanent loss of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) may lose charge permanently under lower heat stress compared to rod magnets. Warning indicator in the table indicates permanent field degradation for this particular item.

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 strong neodymiums attract each other from a much further distance than a magnet and sheet setup. The setup of two magnets creates a more powerful interaction and a wider radius of operation. Designing a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the impact force is huge. The repulsion force is a bit weaker than the connection force, but still impressive.
*Flux density for N-N configuration reaches ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Attention: Results show sliding force of two matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - 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
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
A strong magnetic field poses a serious hazard to IT equipment as well as pacemakers. These magnets produce a flux that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation penetrates the body and plastic. Special caution must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - 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
Neodymium magnets are delicate – 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 skin. Be sure to control the product during mounting so it doesn't hit with great force against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when handling with large magnets.

Table 9: Surface protection spec
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 following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

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)
Total magnetic flux emitted by the pole surface. Key data in coil applications and motors. Pc value defines 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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

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

2. Efficiency vs thickness

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

3. Power loss vs temp

*For N38 grade, 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 and environmental data
Elemental analysis
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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This product is an incredibly powerful rod magnet, manufactured from modern NdFeB material, which, at dimensions of Ø100x30 mm, guarantees the highest energy density. The MW 100x30 / N38 component is characterized by high dimensional repeatability and industrial build quality, making it a perfect solution for professional 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 effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced robotics, and broadly understood industry, serving as a fastening 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 miniature devices and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 100.1 mm) using epoxy glues. To ensure long-term durability in industry, specialized industrial adhesives 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 industrial 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 store.
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 rod magnet 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 diametrically if your project requires it.

Pros and cons of Nd2Fe14B magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have constant strength, and over around ten years their attraction force decreases symbolically – ~1% (in testing),
  • They maintain their magnetic properties even under strong external field,
  • A magnet with a smooth gold surface is more attractive,
  • Magnetic induction on the working layer of the magnet is maximum,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Considering the potential of precise forming and adaptation to specialized needs, magnetic components can be manufactured in a wide range of shapes and sizes, which makes them more universal,
  • Universal use in electronics industry – they are used in magnetic memories, electric motors, precision medical tools, as well as multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Weaknesses

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • We recommend casing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process 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

Holding force characteristics

Highest magnetic holding force – what affects it?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:
  • using a base made of mild steel, acting as a magnetic yoke
  • with a thickness no less than 10 mm
  • with a plane free of scratches
  • without the slightest clearance between the magnet and steel
  • during detachment in a direction vertical to the plane
  • at room temperature

Lifting capacity in real conditions – factors

Bear in mind that the application force may be lower depending on the following factors, starting with the most relevant:
  • Distance – existence of any layer (rust, dirt, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Metal type – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Temperature – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

H&S for magnets
Safe operation

Handle magnets consciously. Their huge power can surprise even professionals. Plan your moves and do not underestimate their force.

Heat sensitivity

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Combustion hazard

Powder generated during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Magnetic interference

A strong magnetic field negatively affects the operation of magnetometers in phones and navigation systems. Do not bring magnets near a device to avoid damaging the sensors.

Medical interference

Warning for patients: Powerful magnets disrupt medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Risk of cracking

Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

This is not a toy

These products are not toys. Swallowing a few magnets may result in them pinching intestinal walls, which constitutes a critical condition and requires urgent medical intervention.

Data carriers

Very strong magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Bodily injuries

Large magnets can crush fingers instantly. Do not put your hand betwixt two strong magnets.

Allergic reactions

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, prevent direct skin contact or opt for encased magnets.

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