← previous
next →
Product available Ships today (order by 14:00) CO2 GPSR PPWR REACH

MW 15x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010032

GTIN/EAN: 5906301810315

5.00
Load capacity 7.37 kg / 72.28 N Magnetic Induction 451.96 mT / 4520 Gs
Diameter Ø
15 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
10.6 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

product details »

4.00 zł net / pcs

4.92 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
4.00 zł
4.92 zł
price from 150 pcs
3.76 zł
4.62 zł
price from 650 pcs
3.52 zł
4.33 zł

Frequently asked questions

What is the maximum working temperature of a disc magnet?
Standard N-series grades work up to 80 °C. Grades N50, N52 and N54 have a lower limit of 60 °C, because coercivity falls as BHmax rises. Higher temperatures require the H (120 °C), SH (150 °C), UH (180 °C), EH (200 °C) or AH (230 °C) series. Within the working range the magnet loses about 0.11% of its induction per degree, and that loss is reversible.
What is the difference between N38, N42 and N52?
The number after N is the energy product BHmax. Moving from N38 to N52 raises it by several tens of percent, but the real holding force increases by roughly 20%, because force also depends on geometry and on the magnetic circuit. N52 costs about twice as much as N42, so for most mounting work N38–N42 is the best price-to-force ratio.
What is the dimensional tolerance?
±0.1 mm as standard, ±0.05 mm to order. The tolerance is stated next to the dimensions on every product page.

Guides from the knowledge base

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.

PDF report Calculator
Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

Order by 14:00 and we’ll ship today!

Technical parameters of the product - 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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 simulation of the assembly - report

These values represent the result of a engineering calculation. Values are based on algorithms for the class Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static force (pull 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 pounds
7370.0 g / 72.3 N
 medium risk
1 mm 3944 Gs
394.4 mT
 5.62 kg / 12.38 pounds
5616.2 g / 55.1 N
 medium risk
2 mm 3362 Gs
336.2 mT
 4.08 kg / 9.00 pounds
4083.1 g / 40.1 N
 medium risk
3 mm 2820 Gs
282.0 mT
 2.87 kg / 6.33 pounds
2871.9 g / 28.2 N
 medium risk
5 mm 1931 Gs
193.1 mT
 1.35 kg / 2.97 pounds
1346.9 g / 13.2 N
 weak grip
10 mm 763 Gs
76.3 mT
 0.21 kg / 0.46 pounds
210.3 g / 2.1 N
 weak grip
15 mm 349 Gs
34.9 mT
 0.04 kg / 0.10 pounds
44.0 g / 0.4 N
 weak grip
20 mm 184 Gs
18.4 mT
 0.01 kg / 0.03 pounds
12.2 g / 0.1 N
 weak grip
30 mm 68 Gs
6.8 mT
 0.00 kg / 0.00 pounds
1.7 g / 0.0 N
 weak grip
50 mm 17 Gs
1.7 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 weak grip
Pulling power decreases sharply with every subsequent millimeter of distance. Remember that even a microscopic distance (e.g., dirt, varnish, rust) significantly diminishes the holding power. Magnetic products work strongest during direct contact; gap drastically cuts the power. Notice how rapidly the parameters plummet, when the magnet does not adhere directly to the steel surface. When calculating the assembly, eliminate additional spacers.

Table 2: Sliding force (wall)
MW 15x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.47 kg / 3.25 pounds
1474.0 g / 14.5 N
1 mm Stal (~0.2) 1.12 kg / 2.48 pounds
1124.0 g / 11.0 N
2 mm Stal (~0.2) 0.82 kg / 1.80 pounds
816.0 g / 8.0 N
3 mm Stal (~0.2) 0.57 kg / 1.27 pounds
574.0 g / 5.6 N
5 mm Stal (~0.2) 0.27 kg / 0.60 pounds
270.0 g / 2.6 N
10 mm Stal (~0.2) 0.04 kg / 0.09 pounds
42.0 g / 0.4 N
15 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 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 shows the estimated force necessary to start the slippage of the magnet downwards against a upright steel wall (assuming standard friction). This value varies with the gap size between the magnet and the metal.

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 pounds
2211.0 g / 21.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.47 kg / 3.25 pounds
1474.0 g / 14.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.74 kg / 1.62 pounds
737.0 g / 7.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.69 kg / 8.12 pounds
3685.0 g / 36.1 N
When mounting a holder on a upright plane (e.g., a fridge), it will only hold only approx. 1/5 of its nominal power. Gravitational force and a low friction coefficient influence the fact that holders move down easier than they pop off the substrate. Planning a vertical fastening? Remember that the sliding force is noticeably lower than the maximum static pull force. On a slippery surface, the element will give way down under a significantly smaller load. Utilizing a rubberized layer can significantly improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MW 15x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.74 kg / 1.62 pounds
737.0 g / 7.2 N
1 mm
25%
 1.84 kg / 4.06 pounds
1842.5 g / 18.1 N
2 mm
50%
 3.69 kg / 8.12 pounds
3685.0 g / 36.1 N
3 mm
75%
 5.53 kg / 12.19 pounds
5527.5 g / 54.2 N
5 mm
100%
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
10 mm
100%
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
11 mm
100%
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
12 mm
100%
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
A too thin steel is incapable of conduct the entire magnetic field, which weakens actual performance of the magnet. Should you mount a strong magnet to a too thin substrate, the flux 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 backing of steel. The material oversaturation means that on delicate walls (e.g., appliance housings), the product holds weaker. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal stability (material behavior) - power drop
MW 15x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
 OK
40 °C -2.2% 7.21 kg / 15.89 pounds
7207.9 g / 70.7 N
 OK
60 °C -4.4% 7.05 kg / 15.53 pounds
7045.7 g / 69.1 N
 OK
80 °C -6.6% 6.88 kg / 15.18 pounds
6883.6 g / 67.5 N
100 °C -28.8% 5.25 kg / 11.57 pounds
5247.4 g / 51.5 N
Classic neodymiums irreversibly lose power past the thermal threshold. Protect against heat – high temperature can permanently damage this magnet. As the temperature rises, the magnet's capacity temporarily lowers. Avoid using this magnet close to heaters exceeding its operating temperature limit. Too high temperature will lead to irreversible degradation of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) may lose charge permanently at lower temperatures than taller cylinders. Red status in the table points to a risk of irreversible loss for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 22.23 kg / 49.02 pounds
5 606 Gs
3.34 kg / 7.35 pounds
3335 g / 32.7 N
 N/A
1 mm 19.55 kg / 43.11 pounds
8 473 Gs
2.93 kg / 6.47 pounds
2933 g / 28.8 N
 17.60 kg / 38.80 pounds
~0 Gs
2 mm 16.94 kg / 37.35 pounds
7 887 Gs
2.54 kg / 5.60 pounds
2541 g / 24.9 N
 15.25 kg / 33.62 pounds
~0 Gs
3 mm 14.52 kg / 32.00 pounds
7 301 Gs
2.18 kg / 4.80 pounds
2178 g / 21.4 N
 13.07 kg / 28.80 pounds
~0 Gs
5 mm 10.37 kg / 22.85 pounds
6 169 Gs
1.55 kg / 3.43 pounds
1555 g / 15.3 N
 9.33 kg / 20.57 pounds
~0 Gs
10 mm 4.06 kg / 8.96 pounds
3 862 Gs
0.61 kg / 1.34 pounds
609 g / 6.0 N
 3.66 kg / 8.06 pounds
~0 Gs
20 mm 0.63 kg / 1.40 pounds
1 526 Gs
0.10 kg / 0.21 pounds
95 g / 0.9 N
 0.57 kg / 1.26 pounds
~0 Gs
50 mm 0.01 kg / 0.03 pounds
215 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
60 mm 0.01 kg / 0.01 pounds
136 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
91 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
64 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
46 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
35 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 much further distance than a magnet and sheet combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of action. Planning to create a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the pinch force is extreme. The repulsion force is a bit weaker than the attraction, but still significant.
*Field value for N-N configuration is approximately ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
* Estimates demonstrate sliding force of a pair of matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - warnings
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
Mechanical watch 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
Powerful magnet radiation poses a serious hazard to IT equipment as well as medical implants. These magnets produce a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field acts through matter and housings. Special caution must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, remotes, speakers, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MW 15x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.88 km/h
(6.35 m/s)
 0.21 J
30 mm 23.24 km/h
(6.45 m/s)
 0.22 J
50 mm 23.24 km/h
(6.46 m/s)
 0.22 J
100 mm 23.24 km/h
(6.46 m/s)
 0.22 J
Neodymium magnets are prone to chipping – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or painful pinches to fingers. Always hold the magnet during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear eye protection when working 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
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. Essential parameter when building generators and motors. Pc value determines the working geometry.

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%
Corrosion 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Wall mount (shear)

*Warning: On a vertical surface, the magnet retains just ~20% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) drastically limits the holding force.

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

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

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

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

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%

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: 010032-2026
Magnet Unit Converter

Magnet pull force

Magnetic Induction

Input your figure into a field, and all other values will convert automatically.

Other products

MP 16x8/4x3 / N38 - ring magnet
Product available Ships today (order by 14:00)

MP 16x8/4x3 / N38 - ring magnet

2.50 zł brutto / pcs
MPL 40x18x10 / N38 - lamellar magnet
Product available Ships today (order by 14:00)

MPL 40x18x10 / N38 - lamellar magnet

30.75 zł brutto / pcs
MPL 45x25x10 / N38 - lamellar magnet
Product available Ships today (order by 14:00)

MPL 45x25x10 / N38 - lamellar magnet

35.01 zł brutto / pcs
UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread
Product available Ships today (order by 14:00)

UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

7.22 zł brutto / pcs
The offered product is an exceptionally strong rod magnet, produced from modern NdFeB material, which, at dimensions of Ø15x8 mm, guarantees maximum efficiency. This specific item boasts high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with significant force (approx. 7.37 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building generators, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 72.28 N with a weight of only 10.6 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 15.1 mm) using epoxy glues. To ensure long-term durability in industry, 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 industrial neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø15x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 15 mm and height 8 mm. The value of 72.28 N means that the magnet is capable of holding a weight many times exceeding its own mass of 10.6 g. The product has a [NiCuNi] coating, which protects the surface 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 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.

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
  • Neodymium magnets prove to be exceptionally resistant to magnetic field loss caused by magnetic disturbances,
  • Thanks to the glossy finish, the plating of Ni-Cu-Ni, gold, or silver gives an elegant appearance,
  • Magnetic induction on the surface of the magnet is maximum,
  • 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 flexibility in constructing and the capacity to customize to individual projects,
  • Key role in modern technologies – they are utilized in hard drives, brushless drives, medical devices, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in compact constructions

Disadvantages

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Limited ability of making nuts in the magnet and complicated forms - preferred is casing - magnet mounting.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The lifting capacity listed is a result of laboratory testing executed under the following configuration:
  • with the contact of a yoke made of special test steel, guaranteeing full magnetic saturation
  • whose transverse dimension reaches at least 10 mm
  • with an polished touching surface
  • with total lack of distance (without coatings)
  • for force acting at a right angle (in the magnet axis)
  • at room temperature

Determinants of practical lifting force of a magnet

Holding efficiency is affected by specific conditions, such as (from priority):
  • Air gap (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, rust or debris).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Steel grade – ideal substrate is pure iron steel. Hardened steels may generate lower lifting capacity.
  • Surface finish – ideal contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was determined by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet and the plate decreases the holding force.

Precautions when working with neodymium magnets
Permanent damage

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Phone sensors

GPS units and mobile phones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Respect the power

Handle magnets consciously. Their powerful strength can surprise even professionals. Plan your moves and do not underestimate their power.

Electronic devices

Intense magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Sensitization to coating

Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness appears, cease handling magnets and use protective gear.

Swallowing risk

NdFeB magnets are not intended for children. Accidental ingestion of several magnets may result in them pinching intestinal walls, which constitutes a critical condition and requires immediate surgery.

ICD Warning

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

Fire warning

Machining of neodymium magnets carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Hand protection

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

Beware of splinters

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Security! Looking for details? Read our article: Why are neodymium magnets dangerous?