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MW 30x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010056

GTIN/EAN: 5906301810551

5.00

Diameter Ø

30 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

26.51 g

Magnetization Direction

↑ axial

Load capacity

8.71 kg / 85.42 N

Magnetic Induction

196.02 mT / 1960 Gs

Coating

[NiCuNi] Nickel

view technical specifications »

8.35 ZŁ with VAT / pcs + price for transport

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Technical of the product - MW 30x5 / N38 - cylindrical magnet

Specification / characteristics - MW 30x5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010056
GTIN/EAN 5906301810551
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 30 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 26.51 g
Magnetization Direction ↑ axial
Load capacity ~ ? 8.71 kg / 85.42 N
Magnetic Induction ~ ? 196.02 mT / 1960 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 30x5 / 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 simulation of the assembly - data

These data are the outcome of a physical analysis. Results rely on algorithms for the class Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs distance) - characteristics
MW 30x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1960 Gs
196.0 mT
 8.71 kg / 19.20 lbs
8710.0 g / 85.4 N
 medium risk
1 mm 1890 Gs
189.0 mT
 8.10 kg / 17.86 lbs
8100.7 g / 79.5 N
 medium risk
2 mm 1802 Gs
180.2 mT
 7.37 kg / 16.24 lbs
7366.2 g / 72.3 N
 medium risk
3 mm 1702 Gs
170.2 mT
 6.57 kg / 14.47 lbs
6565.7 g / 64.4 N
 medium risk
5 mm 1479 Gs
147.9 mT
 4.96 kg / 10.93 lbs
4956.4 g / 48.6 N
 medium risk
10 mm 945 Gs
94.5 mT
 2.02 kg / 4.46 lbs
2024.4 g / 19.9 N
 medium risk
15 mm 576 Gs
57.6 mT
 0.75 kg / 1.66 lbs
752.1 g / 7.4 N
 low risk
20 mm 356 Gs
35.6 mT
 0.29 kg / 0.64 lbs
288.1 g / 2.8 N
 low risk
30 mm 153 Gs
15.3 mT
 0.05 kg / 0.12 lbs
53.2 g / 0.5 N
 low risk
50 mm 43 Gs
4.3 mT
 0.00 kg / 0.01 lbs
4.2 g / 0.0 N
 low risk
Grip strength drops sharply with every subsequent millimeter of spacing. Keep in mind that every additional insulation layer (e.g., contamination, paint, rust) significantly reduces the pull force. Neodymiums hold strongest in perfect adhesion; distance weakens the force. Analyze how quickly the pull force plummet, when the magnet does not touch tightly to the metal substrate. When designing the assembly, avoid unnecessary gaps.

Table 2: Shear force (wall)
MW 30x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.74 kg / 3.84 lbs
1742.0 g / 17.1 N
1 mm Stal (~0.2) 1.62 kg / 3.57 lbs
1620.0 g / 15.9 N
2 mm Stal (~0.2) 1.47 kg / 3.25 lbs
1474.0 g / 14.5 N
3 mm Stal (~0.2) 1.31 kg / 2.90 lbs
1314.0 g / 12.9 N
5 mm Stal (~0.2) 0.99 kg / 2.19 lbs
992.0 g / 9.7 N
10 mm Stal (~0.2) 0.40 kg / 0.89 lbs
404.0 g / 4.0 N
15 mm Stal (~0.2) 0.15 kg / 0.33 lbs
150.0 g / 1.5 N
20 mm Stal (~0.2) 0.06 kg / 0.13 lbs
58.0 g / 0.6 N
30 mm Stal (~0.2) 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
This section presents the estimated weight limit required to initiate the shifting of the magnet down on a vertical steel plate (assuming typical friction coefficient). This value depends on the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MW 30x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.61 kg / 5.76 lbs
2613.0 g / 25.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.74 kg / 3.84 lbs
1742.0 g / 17.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.87 kg / 1.92 lbs
871.0 g / 8.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.36 kg / 9.60 lbs
4355.0 g / 42.7 N
When placing a magnet on a vertical surface (e.g., a board), it you can count on barely about 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that holders slip easier than they pull off. Planning a hanger? Note that the shear force is much weaker than the maximum static pull force. On a slippery surface, the magnet will slip down under a noticeably lighter load. Application of an anti-slip pad can effectively raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 30x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.87 kg / 1.92 lbs
871.0 g / 8.5 N
1 mm
25%
 2.18 kg / 4.80 lbs
2177.5 g / 21.4 N
2 mm
50%
 4.36 kg / 9.60 lbs
4355.0 g / 42.7 N
3 mm
75%
 6.53 kg / 14.40 lbs
6532.5 g / 64.1 N
5 mm
100%
 8.71 kg / 19.20 lbs
8710.0 g / 85.4 N
10 mm
100%
 8.71 kg / 19.20 lbs
8710.0 g / 85.4 N
11 mm
100%
 8.71 kg / 19.20 lbs
8710.0 g / 85.4 N
12 mm
100%
 8.71 kg / 19.20 lbs
8710.0 g / 85.4 N
A too thin steel cannot conduct the full magnetic flux, which weakens actual performance of the holder. If you mount a strong magnet to a too thin substrate, the flux will penetrate right through and the attraction force will be weaker. To utilize full efficiency of this magnet's potential, you need a suitably thick piece of steel. The saturation phenomenon means that on thin elements (e.g., car bodies), the product holds weaker. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal resistance (material behavior) - resistance threshold
MW 30x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 8.71 kg / 19.20 lbs
8710.0 g / 85.4 N
 OK
40 °C -2.2% 8.52 kg / 18.78 lbs
8518.4 g / 83.6 N
 OK
60 °C -4.4% 8.33 kg / 18.36 lbs
8326.8 g / 81.7 N
80 °C -6.6% 8.14 kg / 17.93 lbs
8135.1 g / 79.8 N
100 °C -28.8% 6.20 kg / 13.67 lbs
6201.5 g / 60.8 N
Ordinary NdFeB products change their properties strength after exceeding the maximum temperature. Protect against heat – high temperature can irreversibly demagnetize this magnet. As the temperature rises, the magnet's capacity temporarily decreases. Avoid using this product close to heaters higher than its working range. Exceeding the critical threshold will cause irreversible degradation of magnetism.
*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) are more susceptible to demagnetization sooner than taller cylinders. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MW 30x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 16.74 kg / 36.91 lbs
3 437 Gs
2.51 kg / 5.54 lbs
2511 g / 24.6 N
 N/A
1 mm 16.20 kg / 35.71 lbs
3 856 Gs
2.43 kg / 5.36 lbs
2429 g / 23.8 N
 14.58 kg / 32.14 lbs
~0 Gs
2 mm 15.57 kg / 34.33 lbs
3 780 Gs
2.34 kg / 5.15 lbs
2335 g / 22.9 N
 14.01 kg / 30.89 lbs
~0 Gs
3 mm 14.89 kg / 32.82 lbs
3 696 Gs
2.23 kg / 4.92 lbs
2233 g / 21.9 N
 13.40 kg / 29.54 lbs
~0 Gs
5 mm 13.40 kg / 29.54 lbs
3 507 Gs
2.01 kg / 4.43 lbs
2010 g / 19.7 N
 12.06 kg / 26.58 lbs
~0 Gs
10 mm 9.53 kg / 21.00 lbs
2 957 Gs
1.43 kg / 3.15 lbs
1429 g / 14.0 N
 8.57 kg / 18.90 lbs
~0 Gs
20 mm 3.89 kg / 8.58 lbs
1 890 Gs
0.58 kg / 1.29 lbs
584 g / 5.7 N
 3.50 kg / 7.72 lbs
~0 Gs
50 mm 0.23 kg / 0.50 lbs
458 Gs
0.03 kg / 0.08 lbs
34 g / 0.3 N
 0.21 kg / 0.45 lbs
~0 Gs
60 mm 0.10 kg / 0.23 lbs
307 Gs
0.02 kg / 0.03 lbs
15 g / 0.2 N
 0.09 kg / 0.20 lbs
~0 Gs
70 mm 0.05 kg / 0.11 lbs
213 Gs
0.01 kg / 0.02 lbs
7 g / 0.1 N
 0.04 kg / 0.10 lbs
~0 Gs
80 mm 0.03 kg / 0.06 lbs
153 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
90 mm 0.01 kg / 0.03 lbs
113 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
100 mm 0.01 kg / 0.02 lbs
86 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets interact from a much further distance than a magnet and sheet setup. Such a system of magnet-to-magnet produces a massive flux and a wider radius of performance. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Remember that when connecting a pair of magnets, the pinch force is huge. The levitation is a bit weaker than the attraction, but still impressive.
*Field value in repulsion mode drops to ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Important: Results apply to shear force of a pair of matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - precautionary measures
MW 30x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.0 cm
Hearing aid 10 Gs (1.0 mT) 8.5 cm
Mechanical watch 20 Gs (2.0 mT) 7.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.5 cm
Car key 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field is a serious hazard to electronics as well as pacemakers. These NdFeB products generate a field that prevents correct functioning of digital equipment. Notice: the unseen radiation penetrates the body and housings. Special caution must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, car keys, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MW 30x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.77 km/h
(5.77 m/s)
 0.44 J
30 mm 31.78 km/h
(8.83 m/s)
 1.03 J
50 mm 40.89 km/h
(11.36 m/s)
 1.71 J
100 mm 57.81 km/h
(16.06 m/s)
 3.42 J
NdFeB products are very brittle – a collision with steel can result in shattering. Pay attention to connection velocity – a magnet released freely becomes dangerous. Striking energy can destroy the magnet or painful pinches to skin. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Anti-corrosion coating durability
MW 30x5 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MW 30x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 658 Mx 166.6 µWb
Pc Coefficient 0.25 Low (Flat)
Flux value passing through the pole surface. Key data when building generators and motors. Pc value defines the magnet's operating point.

Table 11: Submerged application
MW 30x5 / N38

Environment Effective steel pull Effect
Air (land) 8.71 kg Standard
Water (riverbed) 9.97 kg
(+1.26 kg buoyancy gain)
+14.5%
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. 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 only a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.25

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.

Engineering data and GPSR
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: 010056-2026
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The offered product is an incredibly powerful cylinder magnet, produced from modern NdFeB material, which, with dimensions of Ø30x5 mm, guarantees optimal power. The MW 30x5 / N38 component boasts a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 8.71 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast 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 finds application in modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 85.42 N with a weight of only 26.51 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. 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.
Magnets NdFeB grade N38 are suitable for the majority of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø30x5), 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 Ø30x5 mm, which, at a weight of 26.51 g, makes it an element with high magnetic energy density. The key parameter here is the holding force amounting to approximately 8.71 kg (force ~85.42 N), which, with such compact dimensions, proves the high grade of the NdFeB material. 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 5 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 diametrically if your project requires it.

Advantages and disadvantages of rare earth magnets.

Advantages

Apart from their superior power, neodymium magnets have these key benefits:
  • They retain magnetic properties for nearly 10 years – the loss is just ~1% (in theory),
  • They are extremely resistant to demagnetization induced by external field influence,
  • By covering with a reflective layer of gold, the element acquires an nice look,
  • Magnetic induction on the top side of the magnet remains extremely intense,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of exact forming and optimizing to atypical conditions,
  • Universal use in high-tech industry – they find application in mass storage devices, electromotive mechanisms, medical equipment, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in small systems

Weaknesses

Cons of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power 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
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing threads and complex forms in magnets, we propose using cover - magnetic mount.
  • Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these products are able to be problematic in diagnostics medical after entering the body.
  • With mass production the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

Magnet power is the result of a measurement for optimal configuration, assuming:
  • on a base made of mild steel, effectively closing the magnetic field
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with an polished touching surface
  • without the slightest insulating layer between the magnet and steel
  • during detachment in a direction vertical to the mounting surface
  • at conditions approx. 20°C

Lifting capacity in practice – influencing factors

It is worth knowing that the application force will differ subject to elements below, in order of importance:
  • Gap (between the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) results in a drastic drop in force 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.
  • Base massiveness – too thin steel does not accept the full field, causing part of the power to be wasted to the other side.
  • Material composition – different alloys attracts identically. High carbon content worsen the attraction effect.
  • Surface finish – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Warnings
Do not overheat magnets

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

Skin irritation risks

It is widely known that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, avoid touching magnets with bare hands or select encased magnets.

Protective goggles

Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Physical harm

Big blocks can crush fingers instantly. Under no circumstances place your hand between two strong magnets.

Cards and drives

Data protection: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, medical aids, mechanical watches).

Do not drill into magnets

Combustion risk: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Do not underestimate power

Be careful. Neodymium magnets attract from a long distance and snap with huge force, often faster than you can react.

ICD Warning

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Impact on smartphones

Remember: rare earth magnets produce a field that confuses precision electronics. Keep a separation from your phone, tablet, and navigation systems.

Swallowing risk

Neodymium magnets are not intended for children. Accidental ingestion of several magnets may result in them connecting inside the digestive tract, which poses a direct threat to life and requires urgent medical intervention.

Warning! Need more info? Read our article: Are neodymium magnets dangerous?