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

MW 8x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010105

GTIN/EAN: 5906301811046

5.00
Load capacity 2.17 kg / 21.31 N Magnetic Induction 483.41 mT / 4834 Gs
Diameter Ø
8 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
1.88 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

product parameters »

0.680 zł net / pcs

0.836 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
0.680 zł
0.836 zł
price from 900 pcs
0.639 zł
0.786 zł
price from 3700 pcs
0.598 zł
0.736 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!

Physical properties - MW 8x5 / N38 - cylindrical magnet

Specification / characteristics - MW 8x5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010105
GTIN/EAN 5906301811046
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 8 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 1.88 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.17 kg / 21.31 N
Magnetic Induction ~ ? 483.41 mT / 4834 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x5 / 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 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

Technical modeling of the product - technical parameters

The following data are the direct effect of a physical analysis. Values are based on algorithms for the class Nd2Fe14B. Operational conditions may differ from theoretical values. Please consider these calculations as a reference point for designers.

Table 1: Static force (pull vs gap) - characteristics
MW 8x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4830 Gs
483.0 mT
 2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
 warning
1 mm 3655 Gs
365.5 mT
 1.24 kg / 2.74 LBS
1242.8 g / 12.2 N
 low risk
2 mm 2610 Gs
261.0 mT
 0.63 kg / 1.40 LBS
633.9 g / 6.2 N
 low risk
3 mm 1825 Gs
182.5 mT
 0.31 kg / 0.68 LBS
310.0 g / 3.0 N
 low risk
5 mm 915 Gs
91.5 mT
 0.08 kg / 0.17 LBS
77.9 g / 0.8 N
 low risk
10 mm 234 Gs
23.4 mT
 0.01 kg / 0.01 LBS
5.1 g / 0.1 N
 low risk
15 mm 89 Gs
8.9 mT
 0.00 kg / 0.00 LBS
0.7 g / 0.0 N
 low risk
20 mm 43 Gs
4.3 mT
 0.00 kg / 0.00 LBS
0.2 g / 0.0 N
 low risk
30 mm 14 Gs
1.4 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
50 mm 3 Gs
0.3 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
Grip strength drops drastically with every subsequent millimeter of gap. Keep in mind that every additional insulation layer (e.g., dirt, paint, veneer) strongly reduces the pull force. Neodymiums hold strongest at the point of direct contact; distance kills the force. See how flashily the load capacity plummet, when the magnet does not adhere directly to the steel surface. When calculating the assembly, eliminate unnecessary gaps.

Table 2: Vertical capacity (wall)
MW 8x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.43 kg / 0.96 LBS
434.0 g / 4.3 N
1 mm Stal (~0.2) 0.25 kg / 0.55 LBS
248.0 g / 2.4 N
2 mm Stal (~0.2) 0.13 kg / 0.28 LBS
126.0 g / 1.2 N
3 mm Stal (~0.2) 0.06 kg / 0.14 LBS
62.0 g / 0.6 N
5 mm Stal (~0.2) 0.02 kg / 0.04 LBS
16.0 g / 0.2 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The table below calculates the estimated holding capacity sufficient to initiate the downward movement of the magnet vertically along a upright steel wall (assuming standard friction coefficient). This parameter depends on the gap size between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 8x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.65 kg / 1.44 LBS
651.0 g / 6.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.43 kg / 0.96 LBS
434.0 g / 4.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.22 kg / 0.48 LBS
217.0 g / 2.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.09 kg / 2.39 LBS
1085.0 g / 10.6 N
When hanging a holder on a upright plane (e.g., a car body), it will maintain barely approx. 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient mean that magnets move down easier than they pull off. Want to create a vertical fastening? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the element will give way down under a noticeably lighter load. Using a rubber coating can effectively improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 8x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.22 kg / 0.48 LBS
217.0 g / 2.1 N
1 mm
25%
 0.54 kg / 1.20 LBS
542.5 g / 5.3 N
2 mm
50%
 1.09 kg / 2.39 LBS
1085.0 g / 10.6 N
3 mm
75%
 1.63 kg / 3.59 LBS
1627.5 g / 16.0 N
5 mm
100%
 2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
10 mm
100%
 2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
11 mm
100%
 2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
12 mm
100%
 2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
A too thin steel is not enough to take in the entire magnetic field, which wastes potential of the magnet. Should you attach a powerful product to a too thin substrate, the magnetism will penetrate right through and the pull force will drop sharply. To utilize the maximum of this neodymium's power, you need a suitably thick piece of steel. The saturation effect means that on sheet metal structures (e.g., thin profiles), the product shows lower pull force. We suggest choosing the steel thickness according to the table below.

Table 5: Thermal stability (stability) - thermal limit
MW 8x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
 OK
40 °C -2.2% 2.12 kg / 4.68 LBS
2122.3 g / 20.8 N
 OK
60 °C -4.4% 2.07 kg / 4.57 LBS
2074.5 g / 20.4 N
 OK
80 °C -6.6% 2.03 kg / 4.47 LBS
2026.8 g / 19.9 N
100 °C -28.8% 1.55 kg / 3.41 LBS
1545.0 g / 15.2 N
Ordinary NdFeB products change their properties parameters past the thermal threshold. Watch out for overheating – high temperature can permanently destroy this magnet. With every degree above norm, the magnet's force briefly lowers. Do not use this magnet close to ovens higher than its safe range. Exceeding the critical threshold will cause destruction of magnetism.
*Engineering note: Temperature resistance is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) risk losing magnetic properties at lower temperatures than taller cylinders. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MW 8x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 7.23 kg / 15.94 LBS
5 742 Gs
1.08 kg / 2.39 LBS
1084 g / 10.6 N
 N/A
1 mm 5.58 kg / 12.31 LBS
8 490 Gs
0.84 kg / 1.85 LBS
838 g / 8.2 N
 5.03 kg / 11.08 LBS
~0 Gs
2 mm 4.14 kg / 9.13 LBS
7 310 Gs
0.62 kg / 1.37 LBS
621 g / 6.1 N
 3.73 kg / 8.21 LBS
~0 Gs
3 mm 2.98 kg / 6.58 LBS
6 207 Gs
0.45 kg / 0.99 LBS
448 g / 4.4 N
 2.69 kg / 5.92 LBS
~0 Gs
5 mm 1.48 kg / 3.26 LBS
4 369 Gs
0.22 kg / 0.49 LBS
222 g / 2.2 N
 1.33 kg / 2.93 LBS
~0 Gs
10 mm 0.26 kg / 0.57 LBS
1 830 Gs
0.04 kg / 0.09 LBS
39 g / 0.4 N
 0.23 kg / 0.51 LBS
~0 Gs
20 mm 0.02 kg / 0.04 LBS
468 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.03 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
47 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
29 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
19 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
13 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
9 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
7 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 magnet and steel setup. The setup of two magnets generates a stronger field and a further horizon of operation. Planning to create a powerful holder? Use a pair of magnets instead of a neodymium and a steel. Remember that when attracting two neodymiums, the collision energy is extreme. The repulsion force is slightly lower than the connection force, but still significant.
*Field value in repulsion mode is approximately ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Note: Estimates demonstrate friction force of dual matching magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - warnings
MW 8x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.5 cm
Hearing aid 10 Gs (1.0 mT) 3.5 cm
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Mobile device 40 Gs (4.0 mT) 2.5 cm
Car key 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation poses a serious hazard to electronics and medical implants. These NdFeB products generate a field that prevents correct functioning of digital equipment. Remember: the invisible magnetic field acts through matter and plastic. Increased vigilance must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MW 8x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.78 km/h
(6.05 m/s)
 0.03 J
30 mm 21.82 km/h
(6.06 m/s)
 0.03 J
50 mm 21.82 km/h
(6.06 m/s)
 0.03 J
100 mm 21.83 km/h
(6.06 m/s)
 0.03 J
Neodymium magnets are delicate – a collision with steel causes immediate chipping. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can destroy the magnet or dangerous crushing to skin. Always hold the magnet during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Surface protection spec
MW 8x5 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Pc)
MW 8x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 450 Mx 24.5 µWb
Pc Coefficient 0.68 High (Stable)
Flux value emitted by the magnet pole. Essential parameter for generator designers and motors. Pc value determines the magnet's operating point.

Table 11: Submerged application
MW 8x5 / N38

Environment Effective steel pull Effect
Air (land) 2.17 kg Standard
Water (riverbed) 2.48 kg
(+0.31 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. However, remember the water resistance when pulling the rope quickly.

1. Wall mount (shear)

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

2. Plate thickness effect

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

3. Thermal stability

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.68

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.

Engineering data and GPSR

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: 010105-2026
Magnet Unit Converter

Pulling force

Field Strength

Put your value in a single field to receive results for the other fields immediately.

Other deals

MPL 200x30x30 / N38 - lamellar magnet
Product available Ships today (order by 14:00)

MPL 200x30x30 / N38 - lamellar magnet

563.28 zł brutto / pcs
MPL 80x40x15 / N38 - lamellar magnet
Product available Ships today (order by 14:00)

MPL 80x40x15 / N38 - lamellar magnet

139.54 zł brutto / pcs
MPL 15x15x5 / N38 - lamellar magnet
Product available Ships today (order by 14:00)

MPL 15x15x5 / N38 - lamellar magnet

4.03 zł brutto / pcs
MW 100x30 / N38 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 100x30 / N38 - cylindrical magnet

650.01 zł brutto / pcs
The offered product is an exceptionally strong rod magnet, manufactured from modern NdFeB material, which, with dimensions of Ø8x5 mm, guarantees the highest energy density. The MW 8x5 / N38 model is characterized by an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 2.17 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 21.31 N with a weight of only 1.88 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø8x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
This model is characterized by dimensions Ø8x5 mm, which, at a weight of 1.88 g, makes it an element with high magnetic energy density. The value of 21.31 N means that the magnet is capable of holding a weight many times exceeding its own mass of 1.88 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 8 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.

Strengths

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They retain attractive force for nearly 10 years – the loss is just ~1% (in theory),
  • They maintain their magnetic properties even under external field action,
  • In other words, due to the shiny layer of nickel, the element looks attractive,
  • Magnets possess very high magnetic induction on the outer side,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to modularity in shaping and the capacity to modify to complex applications,
  • Significant place in future technologies – they are utilized in mass storage devices, electromotive mechanisms, medical devices, as well as technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • At very 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.
  • Neodymium magnets lose their force 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 while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in realizing nuts and complicated forms in magnets, we recommend using a housing - magnetic mechanism.
  • Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Furthermore, tiny parts of these magnets are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum magnetic pulling force – what affects it?

The lifting capacity listed is a measurement result executed under standard conditions:
  • on a block made of structural steel, perfectly concentrating the magnetic flux
  • whose transverse dimension reaches at least 10 mm
  • with an ground contact surface
  • with direct contact (no impurities)
  • during detachment in a direction perpendicular to the mounting surface
  • at ambient temperature room level

Determinants of practical lifting force of a magnet

Real force is influenced by specific conditions, including (from priority):
  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin steel causes magnetic saturation, causing part of the flux to be lost into the air.
  • Chemical composition of the base – mild steel gives the best results. Alloy admixtures decrease magnetic properties and lifting capacity.
  • Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet and the plate reduces the load capacity.

H&S for magnets
Dust explosion hazard

Machining of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Keep away from children

Adult use only. Tiny parts pose a choking risk, leading to serious injuries. Keep away from kids and pets.

Electronic devices

Do not bring magnets near a purse, laptop, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Sensitization to coating

Medical facts indicate that nickel (the usual finish) is a strong allergen. If you have an allergy, refrain from direct skin contact and opt for encased magnets.

Shattering risk

Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Physical harm

Big blocks can smash fingers in a fraction of a second. Under no circumstances place your hand between two attracting surfaces.

Heat warning

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Impact on smartphones

Note: rare earth magnets produce a field that confuses precision electronics. Keep a safe distance from your phone, device, and GPS.

Handling guide

Handle magnets consciously. Their huge power can shock even professionals. Be vigilant and do not underestimate their force.

Medical interference

Patients with a pacemaker must maintain an absolute distance from magnets. The magnetism can stop the functioning of the life-saving device.

Security! Details about hazards in the article: Safety of working with magnets.