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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

technical parameters »

0.369 ZŁ with VAT / pcs + price for transport

0.300 ZŁ net + 23% VAT / pcs

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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

Engineering analysis of the assembly - data

These data constitute the direct effect of a mathematical analysis. Values were calculated on algorithms for the material Nd2Fe14B. Real-world conditions may differ from theoretical values. Use these calculations as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - interaction chart
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 sharply with every mm of distance. Remember that even the smallest gap (e.g., contamination, paint, dust) strongly weakens the grip. Neodymiums hold most effectively at the point of direct contact; air break weakens the force. Notice how quickly the parameters drop, when the product does not adhere directly to the steel surface. When planning the mounting, eliminate unnecessary gaps.

Table 2: Sliding hold (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 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 presents the estimated shear load necessary to start the shifting of the magnet down on a upright steel wall (assuming standard friction coefficient). This value varies with the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 mounting a element on a upright wall (e.g., a fridge), it will maintain barely approx. 1/5 of its maximum pull force. Gravity and a weak degree of grip mean that holders move down easier than they pull off. Planning a wall mount? Note that the shear force is much weaker than the maximum static pull force. On a painted metal, the holder will slide down under a noticeably lighter load. Application of an anti-slip pad can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
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 sheet is incapable of absorb the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To squeeze the maximum of this magnet's potential, you require a sufficiently solid backing of metal. The material oversaturation means that on thin elements (e.g., appliance housings), the product works worse. We advise picking the steel dimension from these parameters.

Table 5: Working in heat (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 irreversibly lose strength past the thermal threshold. Watch out for overheating – heat can irreversibly damage this magnet. With every degree above norm, the neodymium's power momentarily decreases. Do not use this magnet near heat sources exceeding its operating temperature limit. Exceeding the critical threshold will lead to destruction of magnetic properties.
*Technical advisory: Thermal stability depends not only on the material grade, as well as the dimension ratios. Flat magnets (pancake types) are more susceptible to demagnetization under lower heat stress than long magnets. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MW 7x1.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 strong neodymiums attract each other from a wider radius than a magnet and steel setup. Such a system of two magnets creates a more powerful interaction and a larger range of action. Designing a powerful holder? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the pinch force is massive. The repulsion force is slightly lower than the connection force, but still significant.
*The magnetic induction between like poles is approximately ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Important: Results apply to shear force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - 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
A strong magnetic field poses a serious hazard to electronics as well as pacemakers. These neodymiums generate a flux that destroys function of digital equipment. Be aware: the invisible magnetic field passes through tissues and glass. Exceptional care must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - 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
Neodymium magnets are delicate – a collision with steel risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can trigger coating fragments or dangerous crushing to fingers. Be sure to control the product during installation so it doesn't hit with great force against the metal. A collision at high speed means shattering of the neodymium. Wear safety glasses when handling with large magnets.

Table 9: Corrosion resistance
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. Improper coating selection is the most common cause of magnet failure over time.

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)
Total magnetic flux passing through the pole surface. Key data for generator designers as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Note: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Thermal stability

*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) = 0.31

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 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: 010393-2026
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The presented product is an exceptionally strong cylindrical magnet, manufactured from modern NdFeB material, which, with dimensions of Ø7x1.5 mm, guarantees optimal power. The MW 7x1.5 / N38 model boasts an accuracy of ±0.1mm and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod 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 standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 6.75 N with a weight of only 0.43 g, this rod is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 7.1 mm) using two-component epoxy glues. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets N38 are strong enough for the majority of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. 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 available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø7x1.5 mm, which, at a weight of 0.43 g, makes it an element with impressive magnetic energy density. 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.
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. 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 and cons of rare earth magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have constant strength, and over more than ten years their performance decreases symbolically – ~1% (in testing),
  • They feature excellent resistance to magnetism drop when exposed to external fields,
  • A magnet with a metallic gold surface looks better,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to freedom in designing and the capacity to adapt to unusual requirements,
  • Universal use in advanced technology sectors – they are used in computer drives, motor assemblies, medical equipment, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in miniature devices

Cons

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its 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.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited ability of producing nuts in the magnet and complicated shapes - preferred is cover - mounting mechanism.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small components of these magnets are able to complicate diagnosis medical after entering the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Highest magnetic holding force – what it depends on?

The force parameter is a theoretical maximum value performed under the following configuration:
  • on a block made of structural steel, effectively closing the magnetic field
  • with a thickness minimum 10 mm
  • with a surface cleaned and smooth
  • with total lack of distance (no paint)
  • under perpendicular force direction (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

During everyday use, the actual holding force depends on several key aspects, ranked from most significant:
  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is reached only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick sheet does not close the flux, causing part of the power to be wasted to the other side.
  • Material composition – not every steel attracts identically. Alloy additives worsen the interaction with the magnet.
  • Surface condition – ground elements ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
  • Temperature – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity was determined with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, however under shearing force the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Warnings
Nickel coating and allergies

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, cease handling magnets and use protective gear.

Magnets are brittle

Despite the nickel coating, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Precision electronics

An intense magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Keep magnets close to a device to prevent breaking the sensors.

Choking Hazard

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

Permanent damage

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

Handling guide

Exercise caution. Rare earth magnets attract from a long distance and snap with massive power, often quicker than you can react.

Combustion hazard

Fire hazard: Rare earth powder is explosive. Avoid machining magnets in home conditions as this risks ignition.

Serious injuries

Pinching hazard: The attraction force is so great that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Medical implants

People with a ICD must keep an absolute distance from magnets. The magnetism can interfere with the functioning of the implant.

Keep away from computers

Equipment safety: Strong magnets can ruin data carriers and sensitive devices (heart implants, medical aids, timepieces).

Warning! Want to know more? Check our post: Are neodymium magnets dangerous?