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MW 15x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010032

GTIN/EAN: 5906301810315

5.00

Diameter Ø

15 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

10.6 g

Magnetization Direction

↑ axial

Load capacity

7.37 kg / 72.28 N

Magnetic Induction

451.96 mT / 4520 Gs

Coating

[NiCuNi] Nickel

product parameters »

4.92 ZŁ with VAT / pcs + price for transport

4.00 ZŁ net + 23% VAT / pcs

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Lifting power and shape of neodymium magnets can be tested using our magnetic mass calculator.

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

Product card - MW 15x8 / N38 - cylindrical magnet

Specification / characteristics - MW 15x8 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010032
GTIN/EAN 5906301810315
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 15 mm [±0,1 mm]
Height 8 mm [±0,1 mm]
Weight 10.6 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.37 kg / 72.28 N
Magnetic Induction ~ ? 451.96 mT / 4520 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 15x8 / 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 magnet - technical parameters

Presented data constitute the outcome of a engineering simulation. Values were calculated on algorithms for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Use these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (force vs gap) - characteristics
MW 15x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4518 Gs
451.8 mT
 7.37 kg / 16.25 lbs
7370.0 g / 72.3 N
 warning
1 mm 3944 Gs
394.4 mT
 5.62 kg / 12.38 lbs
5616.2 g / 55.1 N
 warning
2 mm 3362 Gs
336.2 mT
 4.08 kg / 9.00 lbs
4083.1 g / 40.1 N
 warning
3 mm 2820 Gs
282.0 mT
 2.87 kg / 6.33 lbs
2871.9 g / 28.2 N
 warning
5 mm 1931 Gs
193.1 mT
 1.35 kg / 2.97 lbs
1346.9 g / 13.2 N
 weak grip
10 mm 763 Gs
76.3 mT
 0.21 kg / 0.46 lbs
210.3 g / 2.1 N
 weak grip
15 mm 349 Gs
34.9 mT
 0.04 kg / 0.10 lbs
44.0 g / 0.4 N
 weak grip
20 mm 184 Gs
18.4 mT
 0.01 kg / 0.03 lbs
12.2 g / 0.1 N
 weak grip
30 mm 68 Gs
6.8 mT
 0.00 kg / 0.00 lbs
1.7 g / 0.0 N
 weak grip
50 mm 17 Gs
1.7 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
Grip strength weakens drastically with every subsequent millimeter of distance. Note that every additional insulation layer (e.g., contamination, paint, veneer) strongly reduces the pull force. Magnetic products operate most effectively in perfect adhesion; distance nullifies the force. Observe how quickly the parameters drop, when the magnet does not adhere flatly to the metal substrate. When calculating the arrangement, discard unnecessary gaps.

Table 2: Vertical force (vertical surface)
MW 15x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.47 kg / 3.25 lbs
1474.0 g / 14.5 N
1 mm Stal (~0.2) 1.12 kg / 2.48 lbs
1124.0 g / 11.0 N
2 mm Stal (~0.2) 0.82 kg / 1.80 lbs
816.0 g / 8.0 N
3 mm Stal (~0.2) 0.57 kg / 1.27 lbs
574.0 g / 5.6 N
5 mm Stal (~0.2) 0.27 kg / 0.60 lbs
270.0 g / 2.6 N
10 mm Stal (~0.2) 0.04 kg / 0.09 lbs
42.0 g / 0.4 N
15 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 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
This section indicates the estimated holding capacity sufficient to cause the slippage of the magnet down along a vertical steel wall (assuming typical friction). This parameter is a function of the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 15x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.21 kg / 4.87 lbs
2211.0 g / 21.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.47 kg / 3.25 lbs
1474.0 g / 14.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.74 kg / 1.62 lbs
737.0 g / 7.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.69 kg / 8.12 lbs
3685.0 g / 36.1 N
When placing a element on a upright plane (e.g., a fridge), it you can count on barely approx. 20%-30% of its maximum pull force. Gravity as well as a weak degree of grip mean that products slip faster than they detach. Want to create a hanger? Remember that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the magnet will slide down under a much lighter weight. Application of an anti-slip pad can significantly improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 15x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.74 kg / 1.62 lbs
737.0 g / 7.2 N
1 mm
25%
 1.84 kg / 4.06 lbs
1842.5 g / 18.1 N
2 mm
50%
 3.69 kg / 8.12 lbs
3685.0 g / 36.1 N
3 mm
75%
 5.53 kg / 12.19 lbs
5527.5 g / 54.2 N
5 mm
100%
 7.37 kg / 16.25 lbs
7370.0 g / 72.3 N
10 mm
100%
 7.37 kg / 16.25 lbs
7370.0 g / 72.3 N
11 mm
100%
 7.37 kg / 16.25 lbs
7370.0 g / 72.3 N
12 mm
100%
 7.37 kg / 16.25 lbs
7370.0 g / 72.3 N
A thin metal plate is incapable of conduct the full magnetic flux, which weakens actual performance of the holder. If you install a neodymium to a weak sheet, the field will pass right through and the holding will be smaller. To achieve full efficiency of this magnet's potential, you need a suitably thick element of steel. The saturation effect causes that on delicate walls (e.g., appliance housings), the product works worse. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal resistance (stability) - resistance threshold
MW 15x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.37 kg / 16.25 lbs
7370.0 g / 72.3 N
 OK
40 °C -2.2% 7.21 kg / 15.89 lbs
7207.9 g / 70.7 N
 OK
60 °C -4.4% 7.05 kg / 15.53 lbs
7045.7 g / 69.1 N
 OK
80 °C -6.6% 6.88 kg / 15.18 lbs
6883.6 g / 67.5 N
100 °C -28.8% 5.25 kg / 11.57 lbs
5247.4 g / 51.5 N
Classic neodymiums irreversibly lose parameters after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly damage this magnet. With increasing heat, the neodymium's capacity temporarily lowers. Refrain from using this product close to heaters exceeding its operating temperature limit. Ignoring the limit will result in destruction of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, but also on the magnet's shape. Flat magnets (low Pc) may lose charge permanently sooner than taller cylinders. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 15x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 22.23 kg / 49.02 lbs
5 606 Gs
3.34 kg / 7.35 lbs
3335 g / 32.7 N
 N/A
1 mm 19.55 kg / 43.11 lbs
8 473 Gs
2.93 kg / 6.47 lbs
2933 g / 28.8 N
 17.60 kg / 38.80 lbs
~0 Gs
2 mm 16.94 kg / 37.35 lbs
7 887 Gs
2.54 kg / 5.60 lbs
2541 g / 24.9 N
 15.25 kg / 33.62 lbs
~0 Gs
3 mm 14.52 kg / 32.00 lbs
7 301 Gs
2.18 kg / 4.80 lbs
2178 g / 21.4 N
 13.07 kg / 28.80 lbs
~0 Gs
5 mm 10.37 kg / 22.85 lbs
6 169 Gs
1.55 kg / 3.43 lbs
1555 g / 15.3 N
 9.33 kg / 20.57 lbs
~0 Gs
10 mm 4.06 kg / 8.96 lbs
3 862 Gs
0.61 kg / 1.34 lbs
609 g / 6.0 N
 3.66 kg / 8.06 lbs
~0 Gs
20 mm 0.63 kg / 1.40 lbs
1 526 Gs
0.10 kg / 0.21 lbs
95 g / 0.9 N
 0.57 kg / 1.26 lbs
~0 Gs
50 mm 0.01 kg / 0.03 lbs
215 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
60 mm 0.01 kg / 0.01 lbs
136 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
91 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
64 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
46 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
35 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnetic products interact from a much further distance than a neodymium and metal setup. The setup of magnet-to-magnet produces a massive flux and a further horizon of action. Planning to create a powerful holder? Apply two magnets instead of one magnet and a steel. Exercise caution that when connecting a pair of magnets, the impact force is extreme. The repulsion force is a bit weaker than the attraction, but still impressive.
*Flux density for N-N configuration reaches ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Important: Estimates apply to shear force of dual matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - precautionary measures
MW 15x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.0 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Timepiece 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Car key 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field is a real danger to electronics and medical implants. These neodymiums produce a field that destroys function of digital equipment. Notice: the unseen radiation acts through matter and plastic. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, car keys, speakers, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - warning
MW 15x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.06 km/h
(7.52 m/s)
 0.30 J
30 mm 46.07 km/h
(12.80 m/s)
 0.87 J
50 mm 59.46 km/h
(16.52 m/s)
 1.45 J
100 mm 84.09 km/h
(23.36 m/s)
 2.89 J
Neodymium magnets are delicate – a collision with steel causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can cause material chips or painful pinches to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when handling with large magnets.

Table 9: Anti-corrosion coating durability
MW 15x8 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
MW 15x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 8 074 Mx 80.7 µWb
Pc Coefficient 0.61 High (Stable)
Total magnetic flux emitted by the pole surface. Key data in coil applications and motors. Pc value determines the magnet's operating point.

Table 11: Physics of underwater searching
MW 15x8 / N38

Environment Effective steel pull Effect
Air (land) 7.37 kg Standard
Water (riverbed) 8.44 kg
(+1.07 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.
1. Sliding resistance

*Note: On a vertical surface, the magnet holds just a fraction of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.61

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
Elemental analysis
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%
Ecology and recycling (GPSR)
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: 010032-2026
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The offered product is a very strong cylindrical magnet, made from advanced NdFeB material, which, with dimensions of Ø15x8 mm, guarantees the highest energy density. This specific item is characterized by an accuracy of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 7.37 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 72.28 N with a weight of only 10.6 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this professional 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 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 (Ø15x8), 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 Ø15x8 mm, which, at a weight of 10.6 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 7.37 kg (force ~72.28 N), which, with such compact 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 15 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 diametrically if your project requires it.

Strengths and weaknesses of rare earth magnets.

Strengths

Apart from their strong power, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • By using a reflective coating of gold, the element acquires an nice look,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in shaping and the capacity to customize to specific needs,
  • Significant place in future technologies – they serve a role in hard drives, drive modules, medical equipment, also complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We recommend a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small elements of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

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

The declared magnet strength concerns the limit force, recorded under optimal environment, specifically:
  • with the application of a yoke made of special test steel, guaranteeing maximum field concentration
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with an polished touching surface
  • under conditions of gap-free contact (metal-to-metal)
  • under perpendicular application of breakaway force (90-degree angle)
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

Holding efficiency impacted by working environment parameters, including (from most important):
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick steel does not accept the full field, causing part of the power to be lost to the other side.
  • Material composition – different alloys attracts identically. High carbon content weaken the attraction effect.
  • Surface finish – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Temperature – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the holding force is lower. Additionally, even a small distance between the magnet and the plate decreases the load capacity.

Safe handling of NdFeB magnets
Fire warning

Dust produced during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Heat sensitivity

Avoid heat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).

Swallowing risk

Adult use only. Small elements pose a choking risk, leading to severe trauma. Keep out of reach of kids and pets.

Nickel allergy

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction occurs, immediately stop handling magnets and use protective gear.

Immense force

Use magnets with awareness. Their huge power can shock even professionals. Be vigilant and do not underestimate their force.

Warning for heart patients

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Bone fractures

Watch your fingers. Two powerful magnets will join immediately with a force of massive weight, destroying anything in their path. Be careful!

Safe distance

Device Safety: Neodymium magnets can damage payment cards and sensitive devices (heart implants, hearing aids, mechanical watches).

Keep away from electronics

GPS units and mobile phones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Magnets are brittle

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

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