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MW 5x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010088

GTIN/EAN: 5906301810872

5.00
Load capacity 0.45 kg / 4.40 N Magnetic Induction 616.32 mT / 6163 Gs
Diameter Ø
5 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
4.42 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
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3.57 zł with VAT / pcs + price for transport

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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 parameters of the product - MW 5x30 / N38 - cylindrical magnet

Specification / characteristics - MW 5x30 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010088
GTIN/EAN 5906301810872
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 5 mm [±0,1 mm]
Height 30 mm [±0,1 mm]
Weight 4.42 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.45 kg / 4.40 N
Magnetic Induction ~ ? 616.32 mT / 6163 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 5x30 / 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

Physical modeling of the assembly - data

Presented data represent the direct effect of a mathematical analysis. Results were calculated on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Treat these calculations as a reference point for designers.

Table 1: Static force (force vs gap) - characteristics
MW 5x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6154 Gs
615.4 mT
 0.45 kg / 0.99 lbs
450.0 g / 4.4 N
 weak grip
1 mm 3877 Gs
387.7 mT
 0.18 kg / 0.39 lbs
178.6 g / 1.8 N
 weak grip
2 mm 2308 Gs
230.8 mT
 0.06 kg / 0.14 lbs
63.3 g / 0.6 N
 weak grip
3 mm 1419 Gs
141.9 mT
 0.02 kg / 0.05 lbs
23.9 g / 0.2 N
 weak grip
5 mm 639 Gs
63.9 mT
 0.00 kg / 0.01 lbs
4.8 g / 0.0 N
 weak grip
10 mm 173 Gs
17.3 mT
 0.00 kg / 0.00 lbs
0.4 g / 0.0 N
 weak grip
15 mm 75 Gs
7.5 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
20 mm 40 Gs
4.0 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
30 mm 16 Gs
1.6 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
50 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Pulling power decreases significantly with every mm of spacing. Note that even a microscopic distance (e.g., dirt, paint, rust) strongly weakens the grip. Magnets hold optimally at the point of direct contact; gap kills the power. See how quickly the pull force plummet, when the magnet does not touch tightly to the metal substrate. When planning the mounting, eliminate additional spacers.

Table 2: Vertical capacity (vertical surface)
MW 5x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.09 kg / 0.20 lbs
90.0 g / 0.9 N
1 mm Stal (~0.2) 0.04 kg / 0.08 lbs
36.0 g / 0.4 N
2 mm Stal (~0.2) 0.01 kg / 0.03 lbs
12.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below presents the approximate shear load required to cause the shifting of the magnet vertically along a vertical steel plate (considering typical friction). The holding force is relative to the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 5x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.14 kg / 0.30 lbs
135.0 g / 1.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.09 kg / 0.20 lbs
90.0 g / 0.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.05 kg / 0.10 lbs
45.0 g / 0.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.23 kg / 0.50 lbs
225.0 g / 2.2 N
When placing a magnet on a upright wall (e.g., a board), it will maintain just approx. 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient cause that holders slide down easier than they detach. Want to create a vertical fastening? Consider that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the element will slide down under a significantly smaller load. Application of an anti-slip coating can effectively raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 5x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.05 kg / 0.10 lbs
45.0 g / 0.4 N
1 mm
25%
 0.11 kg / 0.25 lbs
112.5 g / 1.1 N
2 mm
50%
 0.23 kg / 0.50 lbs
225.0 g / 2.2 N
3 mm
75%
 0.34 kg / 0.74 lbs
337.5 g / 3.3 N
5 mm
100%
 0.45 kg / 0.99 lbs
450.0 g / 4.4 N
10 mm
100%
 0.45 kg / 0.99 lbs
450.0 g / 4.4 N
11 mm
100%
 0.45 kg / 0.99 lbs
450.0 g / 4.4 N
12 mm
100%
 0.45 kg / 0.99 lbs
450.0 g / 4.4 N
A thin metal plate is unable to take in the full magnetic flux, which wastes potential of the holder. If you install a neodymium to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To utilize 100% of this magnet's power, you require a sufficiently solid piece of steel. The saturation effect causes that on delicate walls (e.g., car bodies), the product shows lower pull force. We advise picking the steel cross-section according to the table below.

Table 5: Working in heat (stability) - resistance threshold
MW 5x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.45 kg / 0.99 lbs
450.0 g / 4.4 N
 OK
40 °C -2.2% 0.44 kg / 0.97 lbs
440.1 g / 4.3 N
 OK
60 °C -4.4% 0.43 kg / 0.95 lbs
430.2 g / 4.2 N
 OK
80 °C -6.6% 0.42 kg / 0.93 lbs
420.3 g / 4.1 N
100 °C -28.8% 0.32 kg / 0.71 lbs
320.4 g / 3.1 N
Classic neodymiums lose parameters above the temperature limit. Protect against heat – high temperature can irreversibly damage this product. With increasing heat, the magnet's force temporarily decreases. Avoid using this magnet close to heaters exceeding its operating temperature limit. Ignoring the limit will cause destruction of magnetism.
*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) may lose charge permanently sooner than taller cylinders. Red status in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
MW 5x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.58 kg / 10.11 lbs
6 170 Gs
0.69 kg / 1.52 lbs
688 g / 6.7 N
 N/A
1 mm 2.98 kg / 6.57 lbs
9 927 Gs
0.45 kg / 0.99 lbs
447 g / 4.4 N
 2.68 kg / 5.92 lbs
~0 Gs
2 mm 1.82 kg / 4.01 lbs
7 755 Gs
0.27 kg / 0.60 lbs
273 g / 2.7 N
 1.64 kg / 3.61 lbs
~0 Gs
3 mm 1.08 kg / 2.39 lbs
5 981 Gs
0.16 kg / 0.36 lbs
162 g / 1.6 N
 0.97 kg / 2.15 lbs
~0 Gs
5 mm 0.39 kg / 0.86 lbs
3 595 Gs
0.06 kg / 0.13 lbs
59 g / 0.6 N
 0.35 kg / 0.78 lbs
~0 Gs
10 mm 0.05 kg / 0.11 lbs
1 278 Gs
0.01 kg / 0.02 lbs
7 g / 0.1 N
 0.04 kg / 0.10 lbs
~0 Gs
20 mm 0.00 kg / 0.01 lbs
346 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
49 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
32 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
22 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
16 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
12 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
9 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two strong neodymiums attract each other from a much further distance than a magnet and steel combination. The setup of two magnets produces a massive flux and a further horizon of action. Designing 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 slightly lower than the connection force, but still significant.
*Field value for N-N configuration is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).
* Calculations refer to sliding force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - warnings
MW 5x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Timepiece 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Car key 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field poses a large risk to electronics and pacemakers. These neodymiums generate a field that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field penetrates the body and housings. Exceptional care must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MW 5x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 5.27 km/h
(1.46 m/s)
 0.00 J
30 mm 5.28 km/h
(1.47 m/s)
 0.00 J
50 mm 5.28 km/h
(1.47 m/s)
 0.00 J
100 mm 5.28 km/h
(1.47 m/s)
 0.00 J
NdFeB products are prone to chipping – a strong collision with metal risks their cracking. Watch the impact speed – a neodymium left loose becomes dangerous. Striking energy can trigger coating fragments or dangerous crushing to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear safety glasses when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 5x30 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MW 5x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 468 Mx 14.7 µWb
Pc Coefficient 1.59 High (Stable)
Flux value passing through the pole surface. Essential parameter when building generators and motors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MW 5x30 / N38

Environment Effective steel pull Effect
Air (land) 0.45 kg Standard
Water (riverbed) 0.52 kg
(+0.07 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.

1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds just approx. 20-30% of its max power.

2. Plate thickness effect

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

3. Temperature resistance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.59

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 and environmental data

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%

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: 010088-2026
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The offered product is an exceptionally strong cylindrical magnet, composed of durable NdFeB material, which, with dimensions of Ø5x30 mm, guarantees maximum efficiency. The MW 5x30 / N38 component features high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 0.45 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building generators, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 4.40 N with a weight of only 4.42 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure stability 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.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø5x30), 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 5 mm and height 30 mm. The value of 4.40 N means that the magnet is capable of holding a weight many times exceeding its own mass of 4.42 g. 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 5 mm. 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.

Pros as well as cons of Nd2Fe14B magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even during around ten years – the drop in power is only ~1% (according to tests),
  • They possess excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
  • In other words, due to the glossy layer of silver, the element becomes visually attractive,
  • Neodymium magnets ensure maximum magnetic induction on a their surface, which increases force concentration,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Due to the potential of free molding and adaptation to specialized projects, NdFeB magnets can be created in a wide range of shapes and sizes, which amplifies use scope,
  • Wide application in advanced technology sectors – they find application in hard drives, electric motors, medical devices, also multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Cons of neodymium magnets: tips and applications.
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets lose their force 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 durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of producing nuts in the magnet and complicated forms - recommended is casing - magnet mounting.
  • Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. Furthermore, tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Magnetic strength at its maximum – what affects it?

Breakaway force was determined for the most favorable conditions, taking into account:
  • using a base made of mild steel, functioning as a magnetic yoke
  • with a cross-section of at least 10 mm
  • with an polished contact surface
  • with direct contact (without impurities)
  • under perpendicular application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

Lifting capacity in real conditions – factors

Real force impacted by working environment parameters, including (from priority):
  • Air gap (betwixt the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Metal type – not every steel attracts identically. High carbon content weaken the attraction effect.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was assessed by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

H&S for magnets
Physical harm

Risk of injury: The attraction force is so great that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Threat to electronics

Avoid bringing magnets near a wallet, computer, or TV. The magnetic field can permanently damage these devices and erase data from cards.

Allergy Warning

Medical facts indicate that the nickel plating (the usual finish) is a strong allergen. If your skin reacts to metals, avoid touching magnets with bare hands and choose versions in plastic housing.

Thermal limits

Regular neodymium magnets (grade N) lose power when the temperature goes above 80°C. This process is irreversible.

Magnets are brittle

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

Medical implants

People with a ICD have to keep an safe separation from magnets. The magnetic field can stop the functioning of the life-saving device.

Precision electronics

Note: neodymium magnets produce a field that disrupts sensitive sensors. Keep a separation from your phone, device, and navigation systems.

Immense force

Exercise caution. Rare earth magnets attract from a distance and connect with massive power, often quicker than you can move away.

Swallowing risk

Adult use only. Small elements pose a choking risk, causing intestinal necrosis. Keep away from kids and pets.

Fire risk

Machining of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

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