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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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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 data 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 analysis of the product - data

The following data are the direct effect of a physical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull 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 decreases significantly with every mm of spacing. Note that every additional insulation layer (e.g., contamination, paint, dust) noticeably reduces the pull force. Magnetic products operate strongest at the point of direct contact; distance kills the power. See how rapidly the pull force fall, when the product does not adhere tightly to the steel surface. When designing the mounting, discard unnecessary gaps.

Table 2: Vertical capacity (wall)
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
This section defines the estimated shear load required to cause the shifting of the magnet vertically along a vertical steel plate (considering standard friction coefficient). The holding force depends on the air gap between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
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 mounting a magnet on a upright surface (e.g., a board), it will only hold barely approx. 20%-30% of its maximum pull force. Gravitational force and a low friction coefficient mean that holders move down easier than they pop off the substrate. Planning a vertical fastening? Note that the shear force is much weaker than the maximum static pull force. On a slippery surface, the holder will slide down under a noticeably lighter load. Utilizing a rubberized layer can drastically improve the result.

Table 4: Steel thickness (saturation) - 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 cannot take in the full magnetic flux, which weakens actual performance of the holder. If you install a neodymium to a too thin substrate, the field will pass right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's power, you require a sufficiently solid piece of metal. The saturation effect causes that on delicate walls (e.g., appliance housings), the product works worse. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal stability (material behavior) - thermal limit
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 strength above the temperature limit. Protect against heat – excessive heat can irreversibly damage this product. With every degree above norm, the magnet's force momentarily decreases. Avoid using this magnet near heat sources exceeding its safe range. Exceeding the critical threshold will cause permanent loss of magnetism.
*Engineering note: Thermal stability is determined by both grade, but also on the magnet's shape. Low-profile magnets (low Pc) are more susceptible to demagnetization sooner compared to rod magnets. The danger warning in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MW 4x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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 steel setup. The connection of magnet-to-magnet generates a stronger field and a larger range of action. Planning to create a powerful holder? Apply two magnets instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is massive. The levitation is a bit weaker than the connection force, but still large.
*Flux density in repulsion mode drops to ~0 Gs at the geometric center of the gap (resulting from vector opposition).
Important: Estimates apply to shear force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - 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
Timepiece 20 Gs (2.0 mT) 2.0 cm
Phone / Smartphone 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 poses a serious hazard to electronics as well as medical implants. These neodymiums generate a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation penetrates the body and housings. Increased vigilance must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
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
Neodymium magnets are very brittle – a strong collision with metal risks their cracking. Control the attraction moment – a neodymium left loose turns into a projectile. Kinetic force can trigger coating fragments or painful pinches to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when playing with large magnets.

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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 4x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 717 Mx 7.2 µWb
Pc Coefficient 0.89 High (Stable)
Total magnetic flux passing through the magnet pole. Key data for generator designers as well as sensors. 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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

*Caution: On a vertical surface, the magnet holds merely ~20% of its nominal pull.

2. Steel thickness impact

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

3. Power loss vs temp

*For N38 grade, the critical 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%
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: 010076-2026
Measurement Calculator
Force (pull)
Field Strength
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This product is a very strong cylindrical magnet, composed of modern NdFeB material, which, at dimensions of Ø4x4 mm, guarantees optimal power. This specific item features high dimensional repeatability and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 0.51 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, 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 every gram matters.
Since our magnets have a very precise dimensions, the recommended way 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 automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø4x4), 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 Ø4x4 mm, which, at a weight of 0.38 g, makes it an element with impressive magnetic energy density. 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 secures it against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 4 mm), which means that the N and S poles are located on the flat, circular surfaces. 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.

Advantages and disadvantages of neodymium magnets.

Benefits

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • They have constant strength, and over around 10 years their performance decreases symbolically – ~1% (in testing),
  • They feature excellent resistance to magnetism drop due to external magnetic sources,
  • The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Neodymium magnets create maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • 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 modeling and adjusting to defined requirements,
  • Universal use in future technologies – they are used in HDD drives, electric motors, medical devices, and other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest cover - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets are able to complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Maximum holding power of the magnet – what it depends on?

The lifting capacity listed is a theoretical maximum value performed under specific, ideal conditions:
  • on a base made of mild steel, optimally conducting the magnetic field
  • whose transverse dimension equals approx. 10 mm
  • characterized by smoothness
  • with total lack of distance (no impurities)
  • during detachment in a direction perpendicular to the mounting surface
  • at room temperature

Magnet lifting force in use – key factors

Holding efficiency is affected by specific conditions, mainly (from priority):
  • Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Angle of force application – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Stainless steels may attract less.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under shearing force the holding force is lower. Moreover, even a small distance between the magnet and the plate decreases the holding force.

H&S for magnets
Adults only

These products are not suitable for play. Accidental ingestion of several magnets may result in them pinching intestinal walls, which poses a severe health hazard and requires immediate surgery.

Danger to pacemakers

For implant holders: Powerful magnets affect electronics. Keep at least 30 cm distance or request help to work with the magnets.

Allergic reactions

Studies show that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, refrain from touching magnets with bare hands and opt for versions in plastic housing.

Electronic hazard

Do not bring magnets close to a wallet, laptop, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.

Fire risk

Fire hazard: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Crushing force

Pinching hazard: The attraction force is so immense that it can cause blood blisters, pinching, and broken bones. Protective gloves are recommended.

Do not overheat magnets

Regular neodymium magnets (N-type) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Magnets are brittle

NdFeB magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets will cause them cracking into small pieces.

Respect the power

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Phone sensors

GPS units and smartphones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can ruin the internal compass in your phone.

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