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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

check technical specifications »

8.35 ZŁ with VAT / pcs + price for transport

6.79 ZŁ net + 23% VAT / pcs

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Weight as well as form of magnetic components can be tested using our force calculator.

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Physical properties - 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 modeling of the assembly - technical parameters

The following values represent the outcome of a mathematical analysis. Values were calculated on models for the class Nd2Fe14B. Actual parameters may deviate from the simulation results. Please consider these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - interaction chart
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
 safe
20 mm 356 Gs
35.6 mT
 0.29 kg / 0.64 lbs
288.1 g / 2.8 N
 safe
30 mm 153 Gs
15.3 mT
 0.05 kg / 0.12 lbs
53.2 g / 0.5 N
 safe
50 mm 43 Gs
4.3 mT
 0.00 kg / 0.01 lbs
4.2 g / 0.0 N
 safe
Grip strength drops drastically with every subsequent millimeter of gap. Remember that every additional insulation layer (e.g., dirt, varnish, rust) noticeably weakens the grip. Magnets work strongest during direct contact; distance drastically cuts the power. Analyze how flashily the parameters fall, when the magnet does not adhere flatly to the metal substrate. When designing the assembly, eliminate additional spacers.

Table 2: Vertical capacity (vertical surface)
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
The table below indicates the approximate weight limit necessary to start the shifting of the magnet down against a vertical metal surface (considering typical friction coefficient). This value varies with the air gap between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
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 element on a upright wall (e.g., a car body), it will maintain just about 20%-30% of its nominal power. Gravitational force and a low friction coefficient influence the fact that holders slip faster than they pull off. Designing a vertical fastening? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the element will give way down under a significantly smaller load. Using a rubber pad can significantly increase the grip.

Table 4: Material efficiency (saturation) - power losses
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 thin metal plate is incapable of take in the entire magnetic field, which wastes potential of the holder. If you mount a strong magnet to a too thin substrate, the flux will pass right through and the pull force will drop sharply. To utilize full efficiency of this neodymium's power, you require a sufficiently solid element of metal. The material oversaturation means that on thin elements (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal stability (stability) - 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
Classic neodymiums lose strength above the temperature limit. Watch out for overheating – heat can permanently damage this magnet. As the temperature rises, the magnet's capacity momentarily lowers. Avoid using this magnet close to heaters exceeding its operating temperature limit. Ignoring the limit will result in irreversible degradation of magnetism.
*Engineering note: Thermal stability 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 than long magnets. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 30x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (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 wider radius than a neodymium and metal setup. The connection of two magnets produces a massive flux and a wider radius of operation. Want to build a strong closure? Apply two magnets instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the impact force is extreme. The levitation is a bit weaker than the attraction, but still large.
*Flux density between like poles is approximately ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Note: Results show friction force of dual matching magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - warnings
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
Remote 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
Extremely neodym field poses a real danger to IT equipment as well as medical implants. These magnets produce a flux that destroys function of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and housings. Special caution must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, car keys, speakers, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
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 delicate – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Kinetic force can trigger coating fragments or dangerous crushing to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A collision at high speed means shattering of the neodymium. Wear safety glasses when working with powerful specimens.

Table 9: Coating parameters (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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
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. Essential parameter when building generators and motors. Pc value determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds merely ~20% of its max power.

2. Plate thickness effect

*Thin steel (e.g. computer case) significantly weakens the holding force.

3. Power loss vs temp

*For N38 material, the max working temp is 80°C.

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

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

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
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%
Environmental data
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 extremely powerful cylinder magnet, made from durable NdFeB material, which, with dimensions of Ø30x5 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 8.71 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 85.42 N with a weight of only 26.51 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., 30.1 mm) using epoxy glues. To ensure stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are suitable for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest 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 warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 30 mm and height 5 mm. The key parameter here is the lifting capacity amounting to approximately 8.71 kg (force ~85.42 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface 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 30 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.

Pros and cons of neodymium magnets.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • By covering with a decorative layer of gold, the element gains an proper look,
  • Magnets exhibit excellent magnetic induction on the surface,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Possibility of custom forming and optimizing to atypical requirements,
  • Key role in advanced technology sectors – they are used in data components, motor assemblies, advanced medical instruments, and complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

What to avoid - cons of neodymium magnets: application proposals
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated shapes.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what it depends on?

The declared magnet strength refers to the maximum value, measured under laboratory conditions, meaning:
  • using a sheet made of high-permeability steel, functioning as a circuit closing element
  • with a cross-section of at least 10 mm
  • with an polished contact surface
  • with zero gap (no impurities)
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

Practical aspects of lifting capacity – factors

Bear in mind that the working load may be lower depending on the following factors, starting with the most relevant:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Plate thickness – too thin sheet causes magnetic saturation, causing part of the power to be lost into the air.
  • Chemical composition of the base – low-carbon steel attracts best. Alloy admixtures decrease magnetic permeability and holding force.
  • Smoothness – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet and the plate lowers the lifting capacity.

Safe handling of NdFeB magnets
Medical implants

Patients with a pacemaker should keep an safe separation from magnets. The magnetic field can stop the functioning of the implant.

Hand protection

Protect your hands. Two large magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Keep away from electronics

Note: rare earth magnets generate a field that disrupts precision electronics. Maintain a separation from your phone, device, and navigation systems.

Cards and drives

Equipment safety: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, mechanical watches).

Sensitization to coating

Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness occurs, immediately stop working with magnets and use protective gear.

Immense force

Use magnets consciously. Their huge power can shock even experienced users. Plan your moves and respect their force.

Keep away from children

Always keep magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are life-threatening.

Dust explosion hazard

Combustion risk: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.

Shattering risk

Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. We recommend safety glasses.

Thermal limits

Do not overheat. Neodymium magnets are sensitive to heat. If you require operation above 80°C, look for HT versions (H, SH, UH).

Danger! More info about hazards in the article: Safety of working with magnets.