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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

check technical specifications »

0.369 ZŁ with VAT / pcs + price for transport

0.300 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 - 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

Physical analysis of the product - technical parameters

Presented data are the outcome of a engineering simulation. Values were calculated on algorithms for the material Nd2Fe14B. Actual parameters may deviate from the simulation results. Use these calculations as a reference point when designing systems.

Table 1: Static force (pull vs gap) - 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 pounds
690.0 g / 6.8 N
 weak grip
1 mm 1900 Gs
190.0 mT
 0.42 kg / 0.92 pounds
419.1 g / 4.1 N
 weak grip
2 mm 1308 Gs
130.8 mT
 0.20 kg / 0.44 pounds
198.6 g / 1.9 N
 weak grip
3 mm 859 Gs
85.9 mT
 0.09 kg / 0.19 pounds
85.7 g / 0.8 N
 weak grip
5 mm 380 Gs
38.0 mT
 0.02 kg / 0.04 pounds
16.7 g / 0.2 N
 weak grip
10 mm 79 Gs
7.9 mT
 0.00 kg / 0.00 pounds
0.7 g / 0.0 N
 weak grip
15 mm 27 Gs
2.7 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 weak grip
20 mm 12 Gs
1.2 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
30 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
Magnetic force weakens drastically per each millimeter of distance. Remember that even the smallest gap (e.g., dirt, varnish, veneer) significantly diminishes the holding power. Magnetic products work most effectively in perfect adhesion; air break nullifies the force. See how flashily the load capacity plummet, when the magnet does not adhere tightly to the metal substrate. When planning the assembly, avoid additional spacers.

Table 2: Sliding force (vertical surface)
MW 7x1.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.14 kg / 0.30 pounds
138.0 g / 1.4 N
1 mm Stal (~0.2) 0.08 kg / 0.19 pounds
84.0 g / 0.8 N
2 mm Stal (~0.2) 0.04 kg / 0.09 pounds
40.0 g / 0.4 N
3 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
5 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below indicates the estimated weight limit sufficient to cause the slippage of the magnet down on a vertical metal surface (considering standard friction). This parameter is a function of the gap size between the magnet and the metal.

Table 3: Wall mounting (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 pounds
207.0 g / 2.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.14 kg / 0.30 pounds
138.0 g / 1.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.07 kg / 0.15 pounds
69.0 g / 0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.35 kg / 0.76 pounds
345.0 g / 3.4 N
When hanging a element on a upright surface (e.g., a board), it you can count on only approx. 1/5 of nominal attraction strength. Gravity and a low friction coefficient influence the fact that magnets slip faster than they pull off. Want to create a hanger? Consider that the sliding force is significantly lower than the perpendicular breakaway force. On a painted metal, the element will give way down under a much lighter load. Application of an anti-slip layer can significantly raise the stability.

Table 4: Steel thickness (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 pounds
69.0 g / 0.7 N
1 mm
25%
 0.17 kg / 0.38 pounds
172.5 g / 1.7 N
2 mm
50%
 0.35 kg / 0.76 pounds
345.0 g / 3.4 N
3 mm
75%
 0.52 kg / 1.14 pounds
517.5 g / 5.1 N
5 mm
100%
 0.69 kg / 1.52 pounds
690.0 g / 6.8 N
10 mm
100%
 0.69 kg / 1.52 pounds
690.0 g / 6.8 N
11 mm
100%
 0.69 kg / 1.52 pounds
690.0 g / 6.8 N
12 mm
100%
 0.69 kg / 1.52 pounds
690.0 g / 6.8 N
A thin metal plate is not enough to absorb the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a weak sheet, the field will pass right through and the attraction force will be weaker. To utilize the maximum of this neodymium's power, you need a suitably thick piece of metal. The material oversaturation means that on thin elements (e.g., car bodies), the product shows lower pull force. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal resistance (material behavior) - 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 pounds
690.0 g / 6.8 N
 OK
40 °C -2.2% 0.67 kg / 1.49 pounds
674.8 g / 6.6 N
 OK
60 °C -4.4% 0.66 kg / 1.45 pounds
659.6 g / 6.5 N
80 °C -6.6% 0.64 kg / 1.42 pounds
644.5 g / 6.3 N
100 °C -28.8% 0.49 kg / 1.08 pounds
491.3 g / 4.8 N
Standard neodymium magnets lose strength after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly damage this magnet. With increasing heat, the neodymium's power temporarily lowers. Do not use this magnet close to heaters exceeding its operating temperature limit. Ignoring the limit will lead to irreversible degradation of magnetism.
*Engineering note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) may lose charge permanently at lower temperatures than taller cylinders. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MW 7x1.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.41 kg / 3.11 pounds
4 025 Gs
0.21 kg / 0.47 pounds
212 g / 2.1 N
 N/A
1 mm 1.15 kg / 2.53 pounds
4 398 Gs
0.17 kg / 0.38 pounds
172 g / 1.7 N
 1.03 kg / 2.28 pounds
~0 Gs
2 mm 0.86 kg / 1.89 pounds
3 801 Gs
0.13 kg / 0.28 pounds
129 g / 1.3 N
 0.77 kg / 1.70 pounds
~0 Gs
3 mm 0.60 kg / 1.33 pounds
3 185 Gs
0.09 kg / 0.20 pounds
90 g / 0.9 N
 0.54 kg / 1.19 pounds
~0 Gs
5 mm 0.27 kg / 0.59 pounds
2 125 Gs
0.04 kg / 0.09 pounds
40 g / 0.4 N
 0.24 kg / 0.53 pounds
~0 Gs
10 mm 0.03 kg / 0.08 pounds
759 Gs
0.01 kg / 0.01 pounds
5 g / 0.1 N
 0.03 kg / 0.07 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
159 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
13 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
8 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
5 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
3 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
2 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
2 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products attract each other from a significantly greater distance than a magnet and sheet setup. The connection of magnet-to-magnet creates a more powerful interaction and a further horizon of operation. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a steel. Remember that when attracting two neodymiums, the collision energy is huge. The levitation is slightly lower than the connection force, but still large.
*Field value for N-N configuration is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
* Results refer to shear force of dual matching neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - warnings
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
Mobile device 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
A strong magnetic field is a serious hazard to electronic devices as well as pacemakers. These NdFeB products generate a field that prevents correct functioning of digital equipment. Notice: the invisible magnetic field penetrates the body and housings. Increased vigilance must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
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
Magnetic elements are very brittle – a violent impact against metal can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or injury to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear safety glasses when handling with powerful specimens.

Table 9: Coating parameters (durability)
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)
The following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical 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. Essential parameter in coil applications as well as sensors. Pc value defines 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%
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. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Caution: On a vertical wall, the magnet holds just ~20% of its max power.

2. Plate thickness effect

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

3. Power loss vs temp

*For standard magnets, the critical 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.

Technical specification and ecology
Chemical composition
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: 010393-2026
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The presented product is an incredibly powerful cylinder magnet, produced from durable NdFeB material, which, with dimensions of Ø7x1.5 mm, guarantees maximum efficiency. The MW 7x1.5 / N38 model is characterized by an accuracy of ±0.1mm and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 0.69 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 6.75 N with a weight of only 0.43 g, this cylindrical magnet is indispensable in electronics 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 immediate cracking of this precision component. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø7x1.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 7 mm and height 1.5 mm. The value of 6.75 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.43 g. The product has a [NiCuNi] coating, which secures it against oxidation, 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 7 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 through the diameter if your project requires it.

Advantages and disadvantages of Nd2Fe14B magnets.

Benefits

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
  • They do not lose their magnetic properties even under external field action,
  • A magnet with a metallic gold surface has better aesthetics,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise shaping as well as adjusting to complex conditions,
  • Universal use in modern technologies – they are used in mass storage devices, drive modules, medical devices, as well as modern systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Limitations

What to avoid - cons of neodymium magnets and ways of using them
  • At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Limited possibility of making nuts in the magnet and complex shapes - recommended is cover - mounting mechanism.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Best holding force of the magnet in ideal parameters – what contributes to it?

The force parameter is a result of laboratory testing executed under specific, ideal conditions:
  • using a plate made of high-permeability steel, serving as a circuit closing element
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • characterized by smoothness
  • under conditions of gap-free contact (surface-to-surface)
  • under vertical force vector (90-degree angle)
  • at standard ambient temperature

Practical lifting capacity: influencing factors

Real force impacted by working environment parameters, mainly (from priority):
  • Distance (between the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Load vector – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be lost into the air.
  • Metal type – different alloys reacts the same. High carbon content worsen the attraction effect.
  • Surface condition – ground elements ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
  • Temperature – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, whereas under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate reduces the holding force.

H&S for magnets
Material brittleness

Neodymium magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets leads to them breaking into shards.

Medical implants

Patients with a pacemaker must keep an absolute distance from magnets. The magnetism can disrupt the operation of the implant.

Magnetic interference

Be aware: neodymium magnets produce a field that interferes with sensitive sensors. Maintain a safe distance from your mobile, device, and GPS.

Crushing risk

Large magnets can crush fingers instantly. Never place your hand betwixt two attracting surfaces.

Fire risk

Fire hazard: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

Magnetic media

Very strong magnetic fields can corrupt files on payment cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Nickel allergy

It is widely known that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent direct skin contact and opt for versions in plastic housing.

Danger to the youngest

NdFeB magnets are not suitable for play. Swallowing several magnets may result in them attracting across intestines, which poses a critical condition and necessitates urgent medical intervention.

Thermal limits

Watch the temperature. Heating the magnet to high heat will ruin its properties and strength.

Do not underestimate power

Use magnets with awareness. Their immense force can shock even experienced users. Be vigilant and do not underestimate their power.

Security! Looking for details? Check our post: Why are neodymium magnets dangerous?