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MW 7x1.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010393

GTIN/EAN: 5906301811091

5.00

Diameter Ø

7 mm [±0,1 mm]

Height

1.5 mm [±0,1 mm]

Weight

0.43 g

Magnetization Direction

↑ axial

Load capacity

0.69 kg / 6.75 N

Magnetic Induction

243.98 mT / 2440 Gs

Coating

[NiCuNi] Nickel

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0.369 ZŁ with VAT / pcs + price for transport

0.300 ZŁ net + 23% VAT / pcs

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Specifications and form of a neodymium magnet can be calculated using our our magnetic calculator.

Orders placed before 14:00 will be shipped the same business day.

Technical of the product - MW 7x1.5 / N38 - cylindrical magnet

Specification / characteristics - MW 7x1.5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010393
GTIN/EAN 5906301811091
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 7 mm [±0,1 mm]
Height 1.5 mm [±0,1 mm]
Weight 0.43 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.69 kg / 6.75 N
Magnetic Induction ~ ? 243.98 mT / 2440 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 7x1.5 / 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 product - report

The following values represent the result of a mathematical analysis. Results rely on models for the class Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Please consider these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs distance) - characteristics
MW 7x1.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2438 Gs
243.8 mT
 0.69 kg / 1.52 lbs
690.0 g / 6.8 N
 weak grip
1 mm 1900 Gs
190.0 mT
 0.42 kg / 0.92 lbs
419.1 g / 4.1 N
 weak grip
2 mm 1308 Gs
130.8 mT
 0.20 kg / 0.44 lbs
198.6 g / 1.9 N
 weak grip
3 mm 859 Gs
85.9 mT
 0.09 kg / 0.19 lbs
85.7 g / 0.8 N
 weak grip
5 mm 380 Gs
38.0 mT
 0.02 kg / 0.04 lbs
16.7 g / 0.2 N
 weak grip
10 mm 79 Gs
7.9 mT
 0.00 kg / 0.00 lbs
0.7 g / 0.0 N
 weak grip
15 mm 27 Gs
2.7 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
20 mm 12 Gs
1.2 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
30 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Magnetic force decreases significantly with every mm of gap. Note that even a very thin break (e.g., contamination, varnish, veneer) significantly weakens the grip. Neodymiums work optimally in perfect adhesion; gap drastically cuts the power. Analyze how quickly the load capacity plummet, when the product does not adhere flatly to the steel surface. When calculating the assembly, avoid additional spacers.

Table 2: Shear load (wall)
MW 7x1.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.14 kg / 0.30 lbs
138.0 g / 1.4 N
1 mm Stal (~0.2) 0.08 kg / 0.19 lbs
84.0 g / 0.8 N
2 mm Stal (~0.2) 0.04 kg / 0.09 lbs
40.0 g / 0.4 N
3 mm Stal (~0.2) 0.02 kg / 0.04 lbs
18.0 g / 0.2 N
5 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 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 table below indicates the estimated force required to cause the sliding of the magnet downwards along a upright steel wall (considering typical friction coefficient). This parameter is a function of the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MW 7x1.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.21 kg / 0.46 lbs
207.0 g / 2.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.14 kg / 0.30 lbs
138.0 g / 1.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.07 kg / 0.15 lbs
69.0 g / 0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.35 kg / 0.76 lbs
345.0 g / 3.4 N
When hanging a element on a upright plane (e.g., a board), it you can count on just about 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip cause that holders slip easier than they pull off. Designing a hanger? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a significantly smaller load. Using a rubber coating can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MW 7x1.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.07 kg / 0.15 lbs
69.0 g / 0.7 N
1 mm
25%
 0.17 kg / 0.38 lbs
172.5 g / 1.7 N
2 mm
50%
 0.35 kg / 0.76 lbs
345.0 g / 3.4 N
3 mm
75%
 0.52 kg / 1.14 lbs
517.5 g / 5.1 N
5 mm
100%
 0.69 kg / 1.52 lbs
690.0 g / 6.8 N
10 mm
100%
 0.69 kg / 1.52 lbs
690.0 g / 6.8 N
11 mm
100%
 0.69 kg / 1.52 lbs
690.0 g / 6.8 N
12 mm
100%
 0.69 kg / 1.52 lbs
690.0 g / 6.8 N
A thin sheet is not enough to absorb the full magnetic flux, which squanders power 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 100% of this neodymium's power, you require a sufficiently solid element of steel. The saturation effect means that on delicate walls (e.g., car bodies), the magnet works worse. We advise picking the steel cross-section according to the table below.

Table 5: Working in heat (stability) - power drop
MW 7x1.5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.69 kg / 1.52 lbs
690.0 g / 6.8 N
 OK
40 °C -2.2% 0.67 kg / 1.49 lbs
674.8 g / 6.6 N
 OK
60 °C -4.4% 0.66 kg / 1.45 lbs
659.6 g / 6.5 N
80 °C -6.6% 0.64 kg / 1.42 lbs
644.5 g / 6.3 N
100 °C -28.8% 0.49 kg / 1.08 lbs
491.3 g / 4.8 N
Classic neodymiums irreversibly lose strength past the thermal threshold. Protect against heat – excessive heat can irreversibly damage this product. With increasing heat, the magnet's capacity briefly decreases. Refrain from using this magnet close to ovens exceeding its safe range. Too high temperature will lead to destruction of magnetism.
*Important note: Temperature resistance is determined by both grade, as well as the dimension ratios. Flat magnets (pancake types) risk losing magnetic properties at lower temperatures than taller cylinders. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 7x1.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.41 kg / 3.11 lbs
4 025 Gs
0.21 kg / 0.47 lbs
212 g / 2.1 N
 N/A
1 mm 1.15 kg / 2.53 lbs
4 398 Gs
0.17 kg / 0.38 lbs
172 g / 1.7 N
 1.03 kg / 2.28 lbs
~0 Gs
2 mm 0.86 kg / 1.89 lbs
3 801 Gs
0.13 kg / 0.28 lbs
129 g / 1.3 N
 0.77 kg / 1.70 lbs
~0 Gs
3 mm 0.60 kg / 1.33 lbs
3 185 Gs
0.09 kg / 0.20 lbs
90 g / 0.9 N
 0.54 kg / 1.19 lbs
~0 Gs
5 mm 0.27 kg / 0.59 lbs
2 125 Gs
0.04 kg / 0.09 lbs
40 g / 0.4 N
 0.24 kg / 0.53 lbs
~0 Gs
10 mm 0.03 kg / 0.08 lbs
759 Gs
0.01 kg / 0.01 lbs
5 g / 0.1 N
 0.03 kg / 0.07 lbs
~0 Gs
20 mm 0.00 kg / 0.00 lbs
159 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
13 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
8 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
5 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
2 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets attract each other from a significantly greater distance than a magnet and steel combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of performance. Planning to create a strong closure? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when connecting a pair of magnets, the collision energy is massive. The levitation is marginally weaker than the connection force, but still significant.
*Flux density in repulsion mode reaches ~0 Gs at the midpoint of the gap (due to field cancellation).
Attention: Estimates refer to sliding force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 7x1.5 / 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
Powerful magnet radiation is a serious hazard to IT equipment and medical implants. These neodymiums generate a field that disrupts operation of digital equipment. Notice: the invisible magnetic field passes through tissues and plastic. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MW 7x1.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 40.43 km/h
(11.23 m/s)
 0.03 J
30 mm 69.97 km/h
(19.44 m/s)
 0.08 J
50 mm 90.34 km/h
(25.09 m/s)
 0.14 J
100 mm 127.75 km/h
(35.49 m/s)
 0.27 J
NdFeB products are very brittle – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose becomes dangerous. Striking energy can trigger coating fragments or injury to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the metal. A collision at high speed ends with a crack of the magnet. Use safety goggles when playing with large magnets.

Table 9: Surface protection spec
MW 7x1.5 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MW 7x1.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 075 Mx 10.8 µWb
Pc Coefficient 0.31 Low (Flat)
Flux value emitted by the magnet pole. Key data for generator designers as well as sensors. Pc value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MW 7x1.5 / N38

Environment Effective steel pull Effect
Air (land) 0.69 kg Standard
Water (riverbed) 0.79 kg
(+0.10 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Note: On a vertical wall, the magnet retains only a fraction of its nominal pull.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.31

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.

Engineering data and GPSR
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: 010393-2026
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Magnetic Induction
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The presented product is a very strong cylindrical magnet, made from durable NdFeB material, which, with dimensions of Ø7x1.5 mm, guarantees the highest energy density. The MW 7x1.5 / N38 component is characterized by an accuracy of ±0.1mm and professional build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 0.69 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, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 6.75 N with a weight of only 0.43 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 stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets N38 are suitable for the majority of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø7x1.5), 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 7 mm and height 1.5 mm. The key parameter here is the lifting capacity amounting to approximately 0.69 kg (force ~6.75 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 1.5 mm), which means that the N and S poles are located on the flat, circular surfaces. 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.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their power is durable, and after around ten years it drops only by ~1% (according to research),
  • They maintain their magnetic properties even under external field action,
  • A magnet with a smooth silver surface has better aesthetics,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • 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 freedom in forming and the capacity to adapt to client solutions,
  • Versatile presence in modern technologies – they are commonly used in mass storage devices, electromotive mechanisms, diagnostic systems, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in small systems

Disadvantages

Problematic aspects of neodymium magnets: application proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Limited ability of producing nuts in the magnet and complicated forms - preferred is cover - mounting mechanism.
  • Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small components of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

Magnet power is the result of a measurement for optimal configuration, assuming:
  • using a plate made of high-permeability steel, functioning as a circuit closing element
  • whose transverse dimension reaches at least 10 mm
  • characterized by smoothness
  • under conditions of gap-free contact (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the application force may be lower subject to elements below, in order of importance:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens 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 plate is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin sheet causes magnetic saturation, causing part of the power to be wasted into the air.
  • Material type – the best choice is pure iron steel. Hardened steels may attract less.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Temperature – heating the magnet results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, whereas under shearing force the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet and the plate decreases the holding force.

Precautions when working with NdFeB magnets
Data carriers

Powerful magnetic fields can destroy records on credit cards, HDDs, and storage devices. Stay away of at least 10 cm.

Crushing force

Mind your fingers. Two large magnets will join instantly with a force of massive weight, crushing everything in their path. Be careful!

Respect the power

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

Sensitization to coating

Certain individuals experience a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Extended handling may cause an allergic reaction. It is best to use protective gloves.

Precision electronics

Remember: rare earth magnets produce a field that confuses precision electronics. Maintain a safe distance from your phone, device, and navigation systems.

Pacemakers

Warning for patients: Powerful magnets affect medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Risk of cracking

Watch out for shards. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Permanent damage

Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. This process is irreversible.

Mechanical processing

Machining of NdFeB material poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Swallowing risk

Neodymium magnets are not intended for children. Eating a few magnets can lead to them attracting across intestines, which constitutes a critical condition and necessitates urgent medical intervention.

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