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MW 4x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010077

GTIN/EAN: 5906301810766

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

0.47 g

Magnetization Direction

↑ axial

Load capacity

0.46 kg / 4.48 N

Magnetic Induction

573.83 mT / 5738 Gs

Coating

[NiCuNi] Nickel

check specifications »

0.320 ZŁ with VAT / pcs + price for transport

0.260 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 - MW 4x5 / N38 - cylindrical magnet

Specification / characteristics - MW 4x5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010077
GTIN/EAN 5906301810766
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 4 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 0.47 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.46 kg / 4.48 N
Magnetic Induction ~ ? 573.83 mT / 5738 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x5 / 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 - data

These data represent the result of a mathematical calculation. Results rely on models for the class Nd2Fe14B. Real-world parameters may differ from theoretical values. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - power drop
MW 4x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5727 Gs
572.7 mT
 0.46 kg / 1.01 pounds
460.0 g / 4.5 N
 safe
1 mm 3109 Gs
310.9 mT
 0.14 kg / 0.30 pounds
135.6 g / 1.3 N
 safe
2 mm 1577 Gs
157.7 mT
 0.03 kg / 0.08 pounds
34.9 g / 0.3 N
 safe
3 mm 856 Gs
85.6 mT
 0.01 kg / 0.02 pounds
10.3 g / 0.1 N
 safe
5 mm 323 Gs
32.3 mT
 0.00 kg / 0.00 pounds
1.5 g / 0.0 N
 safe
10 mm 66 Gs
6.6 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 safe
15 mm 24 Gs
2.4 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
20 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
30 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
Magnetic force decreases significantly with every mm of spacing. Keep in mind that even a very thin break (e.g., dirt, varnish, dust) noticeably diminishes the holding power. Neodymiums hold optimally at the point of direct contact; air break drastically cuts the power. Notice how rapidly the load capacity drop, when the product does not touch directly to the metal substrate. When calculating the arrangement, eliminate unnecessary gaps.

Table 2: Slippage load (wall)
MW 4x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.09 kg / 0.20 pounds
92.0 g / 0.9 N
1 mm Stal (~0.2) 0.03 kg / 0.06 pounds
28.0 g / 0.3 N
2 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
This section presents the approximate weight limit needed to cause the slippage of the magnet vertically along a vertical metal surface (assuming standard friction). The holding force is a function of the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MW 4x5 / 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 pounds
138.0 g / 1.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.09 kg / 0.20 pounds
92.0 g / 0.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.05 kg / 0.10 pounds
46.0 g / 0.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.23 kg / 0.51 pounds
230.0 g / 2.3 N
When placing a holder on a upright plane (e.g., a car body), it you can count on barely approx. 1/5 of its maximum pull force. Gravitational force and a low friction coefficient mean that holders slip easier than they detach. Designing a wall mount? Note that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will slip down under a significantly smaller weight. Application of an anti-slip coating can significantly improve the result.

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

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.05 kg / 0.10 pounds
46.0 g / 0.5 N
1 mm
25%
 0.12 kg / 0.25 pounds
115.0 g / 1.1 N
2 mm
50%
 0.23 kg / 0.51 pounds
230.0 g / 2.3 N
3 mm
75%
 0.35 kg / 0.76 pounds
345.0 g / 3.4 N
5 mm
100%
 0.46 kg / 1.01 pounds
460.0 g / 4.5 N
10 mm
100%
 0.46 kg / 1.01 pounds
460.0 g / 4.5 N
11 mm
100%
 0.46 kg / 1.01 pounds
460.0 g / 4.5 N
12 mm
100%
 0.46 kg / 1.01 pounds
460.0 g / 4.5 N
A thin metal plate is incapable of take in the entire magnetic field, which wastes potential of the holder. If you attach a powerful product to a too thin substrate, the field will pass right through and the holding will be smaller. To achieve full efficiency of this neodymium's power, you need a suitably thick backing of steel. The saturation effect means that on sheet metal structures (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel cross-section from these parameters.

Table 5: Working in heat (stability) - power drop
MW 4x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.46 kg / 1.01 pounds
460.0 g / 4.5 N
 OK
40 °C -2.2% 0.45 kg / 0.99 pounds
449.9 g / 4.4 N
 OK
60 °C -4.4% 0.44 kg / 0.97 pounds
439.8 g / 4.3 N
 OK
80 °C -6.6% 0.43 kg / 0.95 pounds
429.6 g / 4.2 N
100 °C -28.8% 0.33 kg / 0.72 pounds
327.5 g / 3.2 N
Standard neodymium magnets irreversibly lose parameters after exceeding the maximum temperature. Avoid high temperatures – excessive heat can permanently damage this product. With increasing heat, the magnet's force momentarily decreases. Do not use this magnet close to ovens higher than its working range. Too high temperature will lead to permanent loss of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Flat magnets (low Pc) risk losing magnetic properties under lower heat stress than long magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MW 4x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.54 kg / 5.60 pounds
6 049 Gs
0.38 kg / 0.84 pounds
381 g / 3.7 N
 N/A
1 mm 1.45 kg / 3.19 pounds
8 646 Gs
0.22 kg / 0.48 pounds
217 g / 2.1 N
 1.30 kg / 2.87 pounds
~0 Gs
2 mm 0.75 kg / 1.65 pounds
6 218 Gs
0.11 kg / 0.25 pounds
112 g / 1.1 N
 0.67 kg / 1.49 pounds
~0 Gs
3 mm 0.38 kg / 0.83 pounds
4 412 Gs
0.06 kg / 0.12 pounds
57 g / 0.6 N
 0.34 kg / 0.75 pounds
~0 Gs
5 mm 0.10 kg / 0.23 pounds
2 299 Gs
0.02 kg / 0.03 pounds
15 g / 0.2 N
 0.09 kg / 0.20 pounds
~0 Gs
10 mm 0.01 kg / 0.02 pounds
646 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
132 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
12 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
7 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
5 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
3 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
2 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
2 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products interact from a wider radius than a magnet and sheet setup. Such a system of magnet-to-magnet generates a stronger field and a wider radius of operation. Want to build a solid fastener? Use a pair of magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is extreme. The levitation is a bit weaker than the attraction, but still impressive.
*Field value in repulsion mode reaches ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
* Calculations refer to shear force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - warnings
MW 4x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.0 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Mechanical watch 20 Gs (2.0 mT) 2.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 1.5 cm
Car key 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm
A strong magnetic field poses a serious hazard to electronic devices and medical implants. These neodymiums generate a flux that destroys function of digital equipment. Be aware: the invisible magnetic field acts through matter and plastic. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, remotes, membranes, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MW 4x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 14.33 km/h
(3.98 m/s)
 0.00 J
30 mm 14.33 km/h
(3.98 m/s)
 0.00 J
50 mm 14.33 km/h
(3.98 m/s)
 0.00 J
100 mm 14.33 km/h
(3.98 m/s)
 0.00 J
Neodymium magnets are very brittle – a strong collision with metal risks their cracking. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy 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 steel surface. A collision at high speed ends with a crack of the magnet. Wear eye protection when working with large magnets.

Table 9: Coating parameters (durability)
MW 4x5 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MW 4x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 760 Mx 7.6 µWb
Pc Coefficient 1.00 High (Stable)
Total magnetic flux passing through the magnet pole. Essential parameter when building generators and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
MW 4x5 / N38

Environment Effective steel pull Effect
Air (land) 0.46 kg Standard
Water (riverbed) 0.53 kg
(+0.07 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
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 merely approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

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

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.00

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: 010077-2026
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The presented product is a very strong rod magnet, composed of modern NdFeB material, which, with dimensions of Ø4x5 mm, guarantees optimal power. The MW 4x5 / N38 model is characterized by high dimensional repeatability and industrial build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 0.46 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 4.48 N with a weight of only 0.47 g, this rod is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 4.1 mm) using epoxy glues. To ensure long-term durability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability 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 the strongest magnets in the same volume (Ø4x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 4 mm and height 5 mm. The key parameter here is the holding force amounting to approximately 0.46 kg (force ~4.48 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 4 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.

Advantages as well as disadvantages of neodymium magnets.

Benefits

Besides their immense pulling force, neodymium magnets offer the following advantages:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
  • Neodymium magnets are distinguished by highly resistant to magnetic field loss caused by magnetic disturbances,
  • By using a lustrous coating of gold, the element acquires an professional look,
  • They show high magnetic induction at the operating surface, which increases their power,
  • 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 precise shaping and customization to individualized needs, neodymium magnets can be modeled in a variety of forms and dimensions, which makes them more universal,
  • Fundamental importance in innovative solutions – they serve a role in HDD drives, electromotive mechanisms, precision medical tools, as well as technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • 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 stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in creating threads and complicated shapes in magnets, we recommend using cover - magnetic mount.
  • Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum magnetic pulling force – what it depends on?

Magnet power is the result of a measurement for ideal contact conditions, taking into account:
  • using a plate made of high-permeability steel, serving as a ideal flux conductor
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with a plane perfectly flat
  • under conditions of ideal adhesion (surface-to-surface)
  • during pulling in a direction perpendicular to the mounting surface
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Real force is influenced by working environment parameters, such as (from most important):
  • Gap (betwixt the magnet and the metal), since even a tiny distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, rust or debris).
  • Angle of force application – highest force is reached only during perpendicular pulling. The shear force of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. High carbon content worsen the interaction with the magnet.
  • Base smoothness – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

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 holding force is lower. Moreover, even a slight gap between the magnet and the plate reduces the load capacity.

Precautions when working with neodymium magnets
Danger to pacemakers

Life threat: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Data carriers

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

Serious injuries

Big blocks can break fingers instantly. Never put your hand betwixt two strong magnets.

Eye protection

Watch out for shards. Magnets can fracture upon violent connection, launching shards into the air. Eye protection is mandatory.

Threat to navigation

Navigation devices and mobile phones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.

Keep away from children

Adult use only. Tiny parts can be swallowed, causing serious injuries. Keep away from kids and pets.

Maximum temperature

Regular neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. Damage is permanent.

Do not drill into magnets

Powder created during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Nickel allergy

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness occurs, immediately stop working with magnets and use protective gear.

Safe operation

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

Caution! Learn more about risks in the article: Safety of working with magnets.