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neodymium magnets

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MW 4x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010075

GTIN: 5906301810742

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

0.94 g

Magnetization Direction

↑ axial

Load capacity

0.75 kg / 7.38 N

Magnetic Induction

606.05 mT

Coating

[NiCuNi] Nickel

0.800 with VAT / pcs + price for transport

0.650 ZŁ net + 23% VAT / pcs

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MW 4x10 / N38 - cylindrical magnet

Specification / characteristics MW 4x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010075
GTIN 5906301810742
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 10 mm [±0,1 mm]
Weight 0.94 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.75 kg / 7.38 N
Magnetic Induction ~ ? 606.05 mT
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x10 / N38 - cylindrical magnet
properties values units
remenance Br [Min. - Max.] ? 12.2-12.6 kGs
remenance Br [Min. - Max.] ? 1220-1260 T
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 106 °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 - data

These values constitute the outcome of a physical simulation. Values were calculated on algorithms for the material NdFeB. Actual performance may deviate from the simulation results. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - characteristics
MW 4x10 / N38
Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 6049 Gs
604.9 mT
0.75 kg / 750.0 g
7.4 N
low risk
1 mm 3327 Gs
332.7 mT
0.23 kg / 226.9 g
2.2 N
low risk
2 mm 1732 Gs
173.2 mT
0.06 kg / 61.5 g
0.6 N
low risk
5 mm 389 Gs
38.9 mT
0.00 kg / 3.1 g
0.0 N
low risk
10 mm 90 Gs
9.0 mT
0.00 kg / 0.2 g
0.0 N
low risk
15 mm 35 Gs
3.5 mT
0.00 kg / 0.0 g
0.0 N
low risk
20 mm 17 Gs
1.7 mT
0.00 kg / 0.0 g
0.0 N
low risk
30 mm 6 Gs
0.6 mT
0.00 kg / 0.0 g
0.0 N
low risk
50 mm 2 Gs
0.2 mT
0.00 kg / 0.0 g
0.0 N
low risk
Table 2: Wall mounting (sliding) - behavior on slippery surfaces
MW 4x10 / N38
Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.22 kg / 225.0 g
2.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.15 kg / 150.0 g
1.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.08 kg / 75.0 g
0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.38 kg / 375.0 g
3.7 N
Table 3: Material efficiency (substrate influence) - sheet metal selection
MW 4x10 / N38
Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.08 kg / 75.0 g
0.7 N
1 mm
25%
0.19 kg / 187.5 g
1.8 N
2 mm
50%
0.38 kg / 375.0 g
3.7 N
5 mm
100%
0.75 kg / 750.0 g
7.4 N
10 mm
100%
0.75 kg / 750.0 g
7.4 N
Table 4: Thermal resistance (stability) - power drop
MW 4x10 / N38
Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 0.75 kg / 750.0 g
7.4 N
OK
40 °C -2.2% 0.73 kg / 733.5 g
7.2 N
OK
60 °C -4.4% 0.72 kg / 717.0 g
7.0 N
OK
80 °C -6.6% 0.70 kg / 700.5 g
6.9 N
100 °C -28.8% 0.53 kg / 534.0 g
5.2 N
Table 5: Two magnets (attraction) - forces in the system
MW 4x10 / N38
Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 1.13 kg / 1125.0 g
11.0 N
N/A
2 mm 0.09 kg / 90.0 g
0.9 N
0.08 kg / 84.0 g
0.8 N
5 mm 0.00 kg / 0.0 g
0.0 N
0.00 kg / 0.0 g
0.0 N
10 mm 0.00 kg / 0.0 g
0.0 N
0.00 kg / 0.0 g
0.0 N
20 mm 0.00 kg / 0.0 g
0.0 N
0.00 kg / 0.0 g
0.0 N
50 mm 0.00 kg / 0.0 g
0.0 N
0.00 kg / 0.0 g
0.0 N
Table 6: Safety (HSE) (electronics) - precautionary measures
MW 4x10 / N38
Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.5 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Timepiece 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
Table 7: Collisions (kinetic energy) - collision effects
MW 4x10 / N38
Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.49 km/h
(7.91 m/s)
0.03 J
30 mm 49.34 km/h
(13.71 m/s)
0.09 J
50 mm 63.70 km/h
(17.69 m/s)
0.15 J
100 mm 90.08 km/h
(25.02 m/s)
0.29 J
Table 8: Corrosion resistance
MW 4x10 / 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)
Table 9: Submerged application
MW 4x10 / N38
Environment Effective steel pull Effect
Air (land) 0.75 kg Standard
Water (riverbed) 0.86 kg
(+0.11 kg Buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

Check out also offers

This product is an extremely powerful cylinder magnet, manufactured from modern NdFeB material, which, at dimensions of Ø4x10 mm, guarantees maximum efficiency. This specific item boasts a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 0.75 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating effectively protects 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 high power of 7.38 N with a weight of only 0.94 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability 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 popular standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø4x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø4x10 mm, which, at a weight of 0.94 g, makes it an element with impressive magnetic energy density. The value of 7.38 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.94 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 10 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 through the diameter if your project requires it.

Strengths and weaknesses of rare earth magnets.

Apart from their notable magnetism, neodymium magnets have these key benefits:

  • They do not lose magnetism, even over nearly 10 years – the drop in strength is only ~1% (according to tests),
  • Neodymium magnets remain remarkably resistant to loss of magnetic properties caused by external interference,
  • By covering with a shiny coating of silver, the element presents an elegant look,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to modularity in designing and the ability to modify to complex applications,
  • Significant place in electronics industry – they are commonly used in HDD drives, brushless drives, advanced medical instruments, and complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages of NdFeB magnets:

  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We suggest cover - magnetic holder, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these products are able to disrupt the diagnostic process 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

Maximum lifting capacity of the magnetwhat contributes to it?

The force parameter is a result of laboratory testing conducted under specific, ideal conditions:

  • using a plate made of mild steel, functioning as a magnetic yoke
  • whose thickness equals approx. 10 mm
  • characterized by lack of roughness
  • under conditions of gap-free contact (surface-to-surface)
  • during pulling in a direction perpendicular to the plane
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Bear in mind that the application force may be lower subject to the following factors, in order of importance:

  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick steel causes magnetic saturation, causing part of the flux to be escaped to the other side.
  • Material type – ideal substrate is high-permeability steel. Cast iron may have worse magnetic properties.
  • Surface quality – the more even the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate lowers the holding force.

Safety rules for work with NdFeB magnets

Protective goggles

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Combustion hazard

Powder generated during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Heat warning

Regular neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

ICD Warning

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

Physical harm

Watch your fingers. Two large magnets will join instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Swallowing risk

These products are not suitable for play. Accidental ingestion of several magnets may result in them connecting inside the digestive tract, which poses a direct threat to life and requires urgent medical intervention.

GPS Danger

Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Metal Allergy

A percentage of the population have a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Extended handling can result in dermatitis. It is best to use safety gloves.

Do not underestimate power

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

Cards and drives

Avoid bringing magnets close to a purse, computer, or TV. The magnetic field can destroy these devices and erase data from cards.

Attention!

Learn more about hazards in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98