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MW 4x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010076

GTIN/EAN: 5906301810759

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

0.38 g

Magnetization Direction

↑ axial

Load capacity

0.51 kg / 4.96 N

Magnetic Induction

552.79 mT / 5528 Gs

Coating

[NiCuNi] Nickel

see properties »

0.406 ZŁ with VAT / pcs + price for transport

0.330 ZŁ net + 23% VAT / pcs

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Technical specification of the product - MW 4x4 / N38 - cylindrical magnet

Specification / characteristics - MW 4x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010076
GTIN/EAN 5906301810759
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 4 mm [±0,1 mm]
Weight 0.38 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.51 kg / 4.96 N
Magnetic Induction ~ ? 552.79 mT / 5528 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x4 / 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 simulation of the assembly - data

These information constitute the direct effect of a physical analysis. Results were calculated on algorithms for the class Nd2Fe14B. Operational parameters may differ from theoretical values. Treat these data as a reference point for designers.

Table 1: Static force (force vs gap) - interaction chart
MW 4x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5517 Gs
551.7 mT
 0.51 kg / 1.12 LBS
510.0 g / 5.0 N
 low risk
1 mm 2984 Gs
298.4 mT
 0.15 kg / 0.33 LBS
149.2 g / 1.5 N
 low risk
2 mm 1498 Gs
149.8 mT
 0.04 kg / 0.08 LBS
37.6 g / 0.4 N
 low risk
3 mm 803 Gs
80.3 mT
 0.01 kg / 0.02 LBS
10.8 g / 0.1 N
 low risk
5 mm 296 Gs
29.6 mT
 0.00 kg / 0.00 LBS
1.5 g / 0.0 N
 low risk
10 mm 58 Gs
5.8 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 low risk
15 mm 20 Gs
2.0 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
20 mm 9 Gs
0.9 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
30 mm 3 Gs
0.3 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
Grip strength weakens sharply with every mm of spacing. Keep in mind that even a very thin break (e.g., dirt, varnish, rust) noticeably diminishes the holding power. Magnets operate strongest at the point of direct contact; gap nullifies the power. Notice how rapidly the load capacity fall, when the product does not touch tightly to the metal substrate. When designing the arrangement, discard additional spacers.

Table 2: Shear hold (vertical surface)
MW 4x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.10 kg / 0.22 LBS
102.0 g / 1.0 N
1 mm Stal (~0.2) 0.03 kg / 0.07 LBS
30.0 g / 0.3 N
2 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 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 following data presents the theoretical weight limit sufficient to initiate the slippage of the magnet downwards against a vertical steel wall (considering typical friction). This parameter depends on the air gap between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 4x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.15 kg / 0.34 LBS
153.0 g / 1.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.10 kg / 0.22 LBS
102.0 g / 1.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.05 kg / 0.11 LBS
51.0 g / 0.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.26 kg / 0.56 LBS
255.0 g / 2.5 N
When hanging a holder on a vertical surface (e.g., a board), it you can count on only approx. 1/5 of its maximum pull force. Gravity as well as a low friction coefficient influence the fact that products move down faster than they pop off the substrate. Planning a wall mount? Remember that the shear force is much weaker than the maximum static pull force. On a painted metal, the element will slide down under a much lighter weight. Using a rubber layer can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MW 4x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.05 kg / 0.11 LBS
51.0 g / 0.5 N
1 mm
25%
 0.13 kg / 0.28 LBS
127.5 g / 1.3 N
2 mm
50%
 0.26 kg / 0.56 LBS
255.0 g / 2.5 N
3 mm
75%
 0.38 kg / 0.84 LBS
382.5 g / 3.8 N
5 mm
100%
 0.51 kg / 1.12 LBS
510.0 g / 5.0 N
10 mm
100%
 0.51 kg / 1.12 LBS
510.0 g / 5.0 N
11 mm
100%
 0.51 kg / 1.12 LBS
510.0 g / 5.0 N
12 mm
100%
 0.51 kg / 1.12 LBS
510.0 g / 5.0 N
A thin metal plate is incapable of conduct the full magnetic flux, which weakens actual performance of the magnet. If you mount a strong magnet to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To achieve the maximum of this neodymium's potential, you require a sufficiently solid element of metal. The saturation phenomenon means that on delicate walls (e.g., thin profiles), the product works worse. We suggest choosing the steel cross-section according to the table below.

Table 5: Working in heat (material behavior) - power drop
MW 4x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.51 kg / 1.12 LBS
510.0 g / 5.0 N
 OK
40 °C -2.2% 0.50 kg / 1.10 LBS
498.8 g / 4.9 N
 OK
60 °C -4.4% 0.49 kg / 1.07 LBS
487.6 g / 4.8 N
 OK
80 °C -6.6% 0.48 kg / 1.05 LBS
476.3 g / 4.7 N
100 °C -28.8% 0.36 kg / 0.80 LBS
363.1 g / 3.6 N
Classic neodymiums lose parameters after exceeding the maximum temperature. Watch out for overheating – high temperature can permanently damage this magnet. With every degree above norm, the neodymium's capacity briefly drops. Refrain from using this magnet close to heaters higher than its working range. Exceeding the critical threshold will result in destruction of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, as well as the dimension ratios. Flat magnets (low Pc) may lose charge permanently at lower temperatures compared to rod magnets. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MW 4x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.36 kg / 5.20 LBS
5 984 Gs
0.35 kg / 0.78 LBS
354 g / 3.5 N
 N/A
1 mm 1.34 kg / 2.96 LBS
8 324 Gs
0.20 kg / 0.44 LBS
201 g / 2.0 N
 1.21 kg / 2.66 LBS
~0 Gs
2 mm 0.69 kg / 1.52 LBS
5 968 Gs
0.10 kg / 0.23 LBS
103 g / 1.0 N
 0.62 kg / 1.37 LBS
~0 Gs
3 mm 0.34 kg / 0.76 LBS
4 213 Gs
0.05 kg / 0.11 LBS
52 g / 0.5 N
 0.31 kg / 0.68 LBS
~0 Gs
5 mm 0.09 kg / 0.20 LBS
2 169 Gs
0.01 kg / 0.03 LBS
14 g / 0.1 N
 0.08 kg / 0.18 LBS
~0 Gs
10 mm 0.01 kg / 0.01 LBS
592 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
20 mm 0.00 kg / 0.00 LBS
116 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
10 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
6 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
4 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
3 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
2 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
1 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 sheet setup. Such a system of two magnets creates a more powerful interaction and a wider radius of action. Designing a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is extreme. The levitation is a bit weaker than the attraction, but still impressive.
*Field value in repulsion mode is approximately ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
* Calculations refer to sliding force of two same neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - warnings
MW 4x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.0 cm
Hearing aid 10 Gs (1.0 mT) 2.0 cm
Mechanical watch 20 Gs (2.0 mT) 2.0 cm
Mobile device 40 Gs (4.0 mT) 1.5 cm
Remote 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
Extremely neodym field is a real danger to electronics and pacemakers. These neodymiums produce a field that disrupts operation of sensitive medical devices. Remember: the unseen radiation penetrates the body and glass. Special caution must be exercised by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
MW 4x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 36.95 km/h
(10.26 m/s)
 0.02 J
30 mm 63.99 km/h
(17.78 m/s)
 0.06 J
50 mm 82.62 km/h
(22.95 m/s)
 0.10 J
100 mm 116.84 km/h
(32.45 m/s)
 0.20 J
Magnetic elements are prone to chipping – a collision with steel causes immediate chipping. Control the attraction moment – a neodymium left loose speeds with massive force. Impact energy can trigger coating fragments or painful pinches to skin. Be sure to control the product during mounting so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Corrosion resistance
MW 4x4 / 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: Electrical data (Pc)
MW 4x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 717 Mx 7.2 µWb
Pc Coefficient 0.89 High (Stable)
Total magnetic flux emitted by the magnet pole. Essential parameter in coil applications and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
MW 4x4 / N38

Environment Effective steel pull Effect
Air (land) 0.51 kg Standard
Water (riverbed) 0.58 kg
(+0.07 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!
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Note: On a vertical surface, the magnet holds only a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.89

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
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%
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: 010076-2026
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The offered product is a very strong cylinder magnet, composed of durable NdFeB material, which, at dimensions of Ø4x4 mm, guarantees maximum efficiency. The MW 4x4 / N38 component boasts high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 0.51 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 4.96 N with a weight of only 0.38 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø4x4), 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 4 mm. The value of 4.96 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.38 g. The product has a [NiCuNi] coating, which protects the surface against external factors, 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 standard 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.

Strengths and weaknesses of neodymium magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They feature excellent resistance to magnetism drop when exposed to external magnetic sources,
  • By covering with a reflective coating of gold, the element has an aesthetic look,
  • Neodymium magnets ensure maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of exact shaping and optimizing to individual requirements,
  • Huge importance in future technologies – they are commonly used in data components, brushless drives, precision medical tools, also industrial machines.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 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 resistant to moisture, when using outdoors
  • Due to limitations in creating nuts and complex shapes in magnets, we recommend using a housing - magnetic mechanism.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical after entering 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 load parameter shown refers to the peak performance, measured under optimal environment, meaning:
  • using a plate made of mild steel, functioning as a magnetic yoke
  • whose transverse dimension equals approx. 10 mm
  • with an ground touching surface
  • under conditions of gap-free contact (surface-to-surface)
  • under perpendicular force vector (90-degree angle)
  • in neutral thermal conditions

What influences lifting capacity in practice

During everyday use, the real power depends on many variables, presented from the most important:
  • Clearance – existence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Metal type – different alloys attracts identically. Alloy additives weaken the attraction effect.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance between the magnet and the plate lowers the load capacity.

Safe handling of neodymium magnets
Adults only

Strictly store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are tragic.

Protective goggles

Protect your eyes. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.

Keep away from electronics

Remember: neodymium magnets generate a field that confuses sensitive sensors. Maintain a safe distance from your mobile, tablet, and GPS.

Fire risk

Fire warning: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.

Cards and drives

Device Safety: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Medical interference

Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Immense force

Exercise caution. Neodymium magnets act from a long distance and snap with massive power, often faster than you can move away.

Heat warning

Do not overheat. Neodymium magnets are sensitive to temperature. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Crushing risk

Pinching hazard: The attraction force is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Nickel allergy

A percentage of the population suffer from a sensitization to nickel, which is the standard coating for neodymium magnets. Frequent touching might lead to skin redness. We suggest wear safety gloves.

Security! Looking for details? Read our article: Why are neodymium magnets dangerous?