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MW 8x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010104

GTIN/EAN: 5906301811039

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

1.51 g

Magnetization Direction

↑ axial

Load capacity

2.04 kg / 20.00 N

Magnetic Induction

437.78 mT / 4378 Gs

Coating

[NiCuNi] Nickel

view properties »

0.701 ZŁ with VAT / pcs + price for transport

0.570 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 parameters of the product - MW 8x4 / N38 - cylindrical magnet

Specification / characteristics - MW 8x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010104
GTIN/EAN 5906301811039
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 8 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 1.51 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.04 kg / 20.00 N
Magnetic Induction ~ ? 437.78 mT / 4378 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x4 / 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

Engineering analysis of the assembly - technical parameters

Presented values are the outcome of a mathematical analysis. Values rely on algorithms for the material Nd2Fe14B. Actual parameters might slightly differ. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static force (pull vs gap) - power drop
MW 8x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4374 Gs
437.4 mT
 2.04 kg / 4.50 lbs
2040.0 g / 20.0 N
 warning
1 mm 3338 Gs
333.8 mT
 1.19 kg / 2.62 lbs
1187.8 g / 11.7 N
 weak grip
2 mm 2386 Gs
238.6 mT
 0.61 kg / 1.34 lbs
607.0 g / 6.0 N
 weak grip
3 mm 1663 Gs
166.3 mT
 0.29 kg / 0.65 lbs
294.9 g / 2.9 N
 weak grip
5 mm 824 Gs
82.4 mT
 0.07 kg / 0.16 lbs
72.4 g / 0.7 N
 weak grip
10 mm 205 Gs
20.5 mT
 0.00 kg / 0.01 lbs
4.5 g / 0.0 N
 weak grip
15 mm 76 Gs
7.6 mT
 0.00 kg / 0.00 lbs
0.6 g / 0.0 N
 weak grip
20 mm 36 Gs
3.6 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
30 mm 12 Gs
1.2 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
50 mm 3 Gs
0.3 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Grip strength weakens sharply with every mm of spacing. Remember that even the smallest gap (e.g., dirt, paint, dust) strongly reduces the pull force. Neodymiums work strongest during direct contact; gap weakens the power. Observe how rapidly the load capacity drop, when the product does not touch tightly to the metal substrate. When calculating the arrangement, discard redundant distances.

Table 2: Vertical force (vertical surface)
MW 8x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.41 kg / 0.90 lbs
408.0 g / 4.0 N
1 mm Stal (~0.2) 0.24 kg / 0.52 lbs
238.0 g / 2.3 N
2 mm Stal (~0.2) 0.12 kg / 0.27 lbs
122.0 g / 1.2 N
3 mm Stal (~0.2) 0.06 kg / 0.13 lbs
58.0 g / 0.6 N
5 mm Stal (~0.2) 0.01 kg / 0.03 lbs
14.0 g / 0.1 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 theoretical weight limit needed to cause the slippage of the magnet downwards on a vertical steel plate (considering standard friction coefficient). This value is a function of the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 8x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.61 kg / 1.35 lbs
612.0 g / 6.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.41 kg / 0.90 lbs
408.0 g / 4.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.20 kg / 0.45 lbs
204.0 g / 2.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.02 kg / 2.25 lbs
1020.0 g / 10.0 N
When hanging a magnet on a vertical plane (e.g., a car body), it you can count on barely about 20%-30% of nominal attraction strength. Gravitational force as well as a weak degree of grip influence the fact that holders slide down easier than they pull off. Planning a vertical fastening? Remember that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the magnet will slide down under a significantly smaller load. Application of an anti-slip pad can effectively raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 8x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.20 kg / 0.45 lbs
204.0 g / 2.0 N
1 mm
25%
 0.51 kg / 1.12 lbs
510.0 g / 5.0 N
2 mm
50%
 1.02 kg / 2.25 lbs
1020.0 g / 10.0 N
3 mm
75%
 1.53 kg / 3.37 lbs
1530.0 g / 15.0 N
5 mm
100%
 2.04 kg / 4.50 lbs
2040.0 g / 20.0 N
10 mm
100%
 2.04 kg / 4.50 lbs
2040.0 g / 20.0 N
11 mm
100%
 2.04 kg / 4.50 lbs
2040.0 g / 20.0 N
12 mm
100%
 2.04 kg / 4.50 lbs
2040.0 g / 20.0 N
A thin metal plate is incapable of conduct the full magnetic flux, which wastes potential of the holder. Should you mount a strong magnet to a weak sheet, the field will pass right through and the holding will be smaller. To utilize the maximum of this magnet's power, you need a suitably thick piece of metal. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the holder holds weaker. We advise picking the steel thickness from these parameters.

Table 5: Thermal resistance (material behavior) - power drop
MW 8x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.04 kg / 4.50 lbs
2040.0 g / 20.0 N
 OK
40 °C -2.2% 2.00 kg / 4.40 lbs
1995.1 g / 19.6 N
 OK
60 °C -4.4% 1.95 kg / 4.30 lbs
1950.2 g / 19.1 N
80 °C -6.6% 1.91 kg / 4.20 lbs
1905.4 g / 18.7 N
100 °C -28.8% 1.45 kg / 3.20 lbs
1452.5 g / 14.2 N
Standard neodymium magnets change their properties parameters above the temperature limit. Watch out for overheating – excessive heat can permanently damage this magnet. With increasing heat, the neodymium's power momentarily decreases. Avoid using this product near heat sources higher than its safe range. Exceeding the critical threshold will result in irreversible degradation of magnetic properties.
*Technical advisory: Thermal stability depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (pancake types) may lose charge permanently at lower temperatures than taller cylinders. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MW 8x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 5.93 kg / 13.07 lbs
5 531 Gs
0.89 kg / 1.96 lbs
889 g / 8.7 N
 N/A
1 mm 4.63 kg / 10.21 lbs
7 730 Gs
0.69 kg / 1.53 lbs
694 g / 6.8 N
 4.17 kg / 9.18 lbs
~0 Gs
2 mm 3.45 kg / 7.61 lbs
6 675 Gs
0.52 kg / 1.14 lbs
518 g / 5.1 N
 3.11 kg / 6.85 lbs
~0 Gs
3 mm 2.49 kg / 5.50 lbs
5 674 Gs
0.37 kg / 0.82 lbs
374 g / 3.7 N
 2.25 kg / 4.95 lbs
~0 Gs
5 mm 1.23 kg / 2.72 lbs
3 989 Gs
0.18 kg / 0.41 lbs
185 g / 1.8 N
 1.11 kg / 2.45 lbs
~0 Gs
10 mm 0.21 kg / 0.46 lbs
1 648 Gs
0.03 kg / 0.07 lbs
32 g / 0.3 N
 0.19 kg / 0.42 lbs
~0 Gs
20 mm 0.01 kg / 0.03 lbs
410 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
39 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
24 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
15 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
11 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
8 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
6 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets interact from a significantly greater distance than a magnet and steel setup. Such a system of two magnets generates a stronger field and a wider radius of action. Designing a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is massive. The levitation is marginally weaker than the connection force, but still large.
*Flux density for N-N configuration is approximately ~0 Gs at the midpoint between the magnets (due to field cancellation).
Attention: Estimates demonstrate friction force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 8x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.5 cm
Hearing aid 10 Gs (1.0 mT) 3.5 cm
Timepiece 20 Gs (2.0 mT) 2.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.0 cm
Remote 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
Extremely neodym field poses a large risk to electronic devices and pacemakers. These neodymiums produce a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field passes through tissues and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MW 8x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 37.12 km/h
(10.31 m/s)
 0.08 J
30 mm 64.21 km/h
(17.83 m/s)
 0.24 J
50 mm 82.89 km/h
(23.02 m/s)
 0.40 J
100 mm 117.22 km/h
(32.56 m/s)
 0.80 J
Neodymium magnets are prone to chipping – a collision with steel risks their cracking. Watch the impact speed – a magnet released freely 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 slam with momentum against the steel surface. A collision at high speed ends with a crack of the neodymium. Use safety goggles when playing with large magnets.

Table 9: Corrosion resistance
MW 8x4 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MW 8x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 233 Mx 22.3 µWb
Pc Coefficient 0.59 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter for generator designers and motors. Pc value determines the magnet's operating point.

Table 11: Physics of underwater searching
MW 8x4 / N38

Environment Effective steel pull Effect
Air (land) 2.04 kg Standard
Water (riverbed) 2.34 kg
(+0.30 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!
The magnetic field penetrates through water without any losses. 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)

*Caution: On a vertical wall, the magnet holds merely approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.

3. Thermal stability

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.59

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%
Sustainability
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: 010104-2026
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The offered product is an incredibly powerful cylinder magnet, composed of modern NdFeB material, which, at dimensions of Ø8x4 mm, guarantees the highest energy density. The MW 8x4 / N38 component is characterized by high dimensional repeatability and professional build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 2.04 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 20.00 N with a weight of only 1.51 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use 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 do not react with the nickel coating 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 the strongest magnets in the same volume (Ø8x4), 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 8 mm and height 4 mm. The key parameter here is the lifting capacity amounting to approximately 2.04 kg (force ~20.00 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 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 8 mm. 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 through the diameter if your project requires it.

Pros as well as cons of rare earth magnets.

Strengths

Apart from their strong power, neodymium magnets have these key benefits:
  • They retain full power for around ten years – the loss is just ~1% (in theory),
  • Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to look better,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
  • Thanks to modularity in constructing and the ability to customize to specific needs,
  • Huge importance in high-tech industry – they are used in data components, electric motors, precision medical tools, as well as technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only protects them against impacts but also increases 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
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We suggest a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex forms.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Furthermore, small elements of these devices can complicate diagnosis medical in case of swallowing.
  • With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Highest magnetic holding force – what it depends on?

Information about lifting capacity was determined for the most favorable conditions, including:
  • using a sheet made of high-permeability steel, serving as a circuit closing element
  • whose thickness reaches at least 10 mm
  • with a surface free of scratches
  • without any clearance between the magnet and steel
  • during detachment in a direction perpendicular to the plane
  • at room temperature

What influences lifting capacity in practice

In real-world applications, the actual lifting capacity results from a number of factors, listed from the most important:
  • Distance (between the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Angle of force application – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Stainless steels may attract less.
  • Surface condition – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
  • Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet’s surface and the plate lowers the load capacity.

Warnings
Demagnetization risk

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. Damage is permanent.

Electronic devices

Do not bring magnets close to a wallet, computer, or TV. The magnetism can destroy these devices and wipe information from cards.

Combustion hazard

Machining of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Risk of cracking

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets will cause them breaking into small pieces.

Danger to pacemakers

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

Adults only

Strictly keep magnets away from children. Ingestion danger is high, and the effects of magnets connecting inside the body are fatal.

Respect the power

Before starting, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Metal Allergy

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness happens, cease working with magnets and wear gloves.

Crushing risk

Big blocks can break fingers in a fraction of a second. Never place your hand between two strong magnets.

Phone sensors

A powerful magnetic field interferes with the operation of magnetometers in phones and GPS navigation. Maintain magnets near a device to avoid breaking the sensors.

Important! More info about hazards in the article: Magnet Safety Guide.