← previous
next →
Product available Ships tomorrow CO2 GPSR PPWR REACH

MPL 30x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020138

GTIN/EAN: 5906301811442

5.00
Load capacity 8.89 kg / 87.23 N Magnetic Induction 329.52 mT / 3295 Gs
length
30 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
11.25 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

see technical specifications »

3.46 zł net / pcs

4.26 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
3.46 zł
4.26 zł
price from 200 pcs
3.25 zł
4.00 zł
price from 750 pcs
3.04 zł
3.75 zł

Frequently asked questions

What pull rating should I choose for a workshop block magnet?
A catalogue pull rating is measured under stated test conditions. A painted or thin steel surface, a gap or a load acting along the surface can reduce the practical grip. Choose a margin based on the actual installation and read the product card.
Are block neodymium magnets available in more durable versions?
Sintered NdFeB is brittle and can corrode if its coating is damaged. Check the coating and operating-temperature limit of the selected product. A housing may help protect a magnet in an application exposed to impacts.
How should I choose block magnets for mounting a structure?
First check the steel grade and thickness, then any gap created by paint or dirt, and finally the direction of the applied load. Compare these conditions with the specifications of the selected magnet; do not rely on grade alone.

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 data - MPL 30x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 30x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020138
GTIN/EAN 5906301811442
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
length 30 mm [±0,1 mm]
Width 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 11.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 8.89 kg / 87.23 N
Magnetic Induction ~ ? 329.52 mT / 3295 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x10x5 / N38 - lamellar 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 analysis of the product - technical parameters

These information constitute the result of a mathematical analysis. Results rely on models for the material Nd2Fe14B. Actual performance might slightly differ. Use these data as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - power drop
MPL 30x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3294 Gs
329.4 mT
 8.89 kg / 19.60 pounds
8890.0 g / 87.2 N
 strong
1 mm 2866 Gs
286.6 mT
 6.73 kg / 14.84 pounds
6731.1 g / 66.0 N
 strong
2 mm 2424 Gs
242.4 mT
 4.82 kg / 10.62 pounds
4816.4 g / 47.2 N
 strong
3 mm 2022 Gs
202.2 mT
 3.35 kg / 7.38 pounds
3349.6 g / 32.9 N
 strong
5 mm 1397 Gs
139.7 mT
 1.60 kg / 3.53 pounds
1600.3 g / 15.7 N
 low risk
10 mm 615 Gs
61.5 mT
 0.31 kg / 0.68 pounds
309.8 g / 3.0 N
 low risk
15 mm 314 Gs
31.4 mT
 0.08 kg / 0.18 pounds
80.6 g / 0.8 N
 low risk
20 mm 177 Gs
17.7 mT
 0.03 kg / 0.06 pounds
25.8 g / 0.3 N
 low risk
30 mm 70 Gs
7.0 mT
 0.00 kg / 0.01 pounds
4.1 g / 0.0 N
 low risk
50 mm 19 Gs
1.9 mT
 0.00 kg / 0.00 pounds
0.3 g / 0.0 N
 low risk
Pulling power weakens drastically with every subsequent millimeter of spacing. Keep in mind that even the smallest gap (e.g., contamination, paint, rust) noticeably diminishes the holding power. Neodymiums operate optimally during direct contact; air break kills the power. See how quickly the pull force plummet, when the product does not adhere directly to the metal substrate. When designing the mounting, eliminate redundant distances.

Table 2: Sliding hold (vertical surface)
MPL 30x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Raw steel (µ ≈ 0.2) 1.78 kg / 3.92 pounds
1778.0 g / 17.4 N
1 mm Raw steel (µ ≈ 0.2) 1.35 kg / 2.97 pounds
1346.0 g / 13.2 N
2 mm Raw steel (µ ≈ 0.2) 0.96 kg / 2.13 pounds
964.0 g / 9.5 N
3 mm Raw steel (µ ≈ 0.2) 0.67 kg / 1.48 pounds
670.0 g / 6.6 N
5 mm Raw steel (µ ≈ 0.2) 0.32 kg / 0.71 pounds
320.0 g / 3.1 N
10 mm Raw steel (µ ≈ 0.2) 0.06 kg / 0.14 pounds
62.0 g / 0.6 N
15 mm Raw steel (µ ≈ 0.2) 0.02 kg / 0.04 pounds
16.0 g / 0.2 N
20 mm Raw steel (µ ≈ 0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
30 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below indicates the theoretical shear load sufficient to start the shifting of the magnet downwards against a vertical steel wall (considering typical friction coefficient). This value varies with the air gap between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 30x10x5 / N38

Surface type Friction coefficient / % Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% of nominal force
2.67 kg / 5.88 pounds
2667.0 g / 26.2 N
Painted steel (standard)
µ = 0.2 20% of nominal force
1.78 kg / 3.92 pounds
1778.0 g / 17.4 N
Oily/slippery steel
µ = 0.1 10% of nominal force
0.89 kg / 1.96 pounds
889.0 g / 8.7 N
Magnet with anti-slip rubber
µ = 0.5 50% of nominal force
4.45 kg / 9.80 pounds
4445.0 g / 43.6 N
When placing a element on a vertical wall (e.g., a car body), it will maintain just approx. 20%-30% of nominal attraction strength. Gravitational force as well as a weak degree of grip influence the fact that magnets slip easier than they detach. Designing a wall mount? Remember that the sliding force is much weaker than the maximum static pull force. On a slippery surface, the holder will slip down under a significantly smaller cargo. Utilizing a rubberized layer can effectively improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MPL 30x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.89 kg / 1.96 pounds
889.0 g / 8.7 N
1 mm
25%
 2.22 kg / 4.90 pounds
2222.5 g / 21.8 N
2 mm
50%
 4.45 kg / 9.80 pounds
4445.0 g / 43.6 N
3 mm
75%
 6.67 kg / 14.70 pounds
6667.5 g / 65.4 N
5 mm
100%
 8.89 kg / 19.60 pounds
8890.0 g / 87.2 N
10 mm
100%
 8.89 kg / 19.60 pounds
8890.0 g / 87.2 N
11 mm
100%
 8.89 kg / 19.60 pounds
8890.0 g / 87.2 N
12 mm
100%
 8.89 kg / 19.60 pounds
8890.0 g / 87.2 N
A thin sheet is not enough to conduct the full magnetic flux, which weakens actual performance of the magnet. Should you attach a powerful product to a weak sheet, the flux will penetrate right through and the attraction force will be weaker. To utilize 100% of this magnet's potential, you need a suitably thick piece of metal. The material oversaturation causes that on sheet metal structures (e.g., thin profiles), the holder works worse. We recommend selecting the steel dimension according to the table below.

Table 5: Working in heat (stability) - power drop
MPL 30x10x5 / N38

Magnet temperature (°C) Force change relative to 20°C Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 8.89 kg / 19.60 pounds
8890.0 g / 87.2 N
 Estimate
40 °C -4.4% 8.50 kg / 18.75 pounds
8503.1 g / 83.4 N
 Estimate
60 °C -8.6% 8.12 kg / 17.91 pounds
8124.9 g / 79.7 N
 Estimate
80 °C -12.8% 7.76 kg / 17.10 pounds
7755.2 g / 76.1 N
 Material limit
100 °C — — Out of range — no model
The table estimates the reversible force change relative to 20°C, assuming a Br coefficient of -0.11%/°C and force proportional to Br². This is a simplified model with unchanged contact and geometry, not a measurement. Above the material limit, neither force nor irreversible magnetization loss is predicted.
The temperature limit comes from this product’s material data. Permissible conditions also depend on geometry and the magnetic circuit. Without B-H curves for the specific grade and temperature, Pc alone does not determine irreversible demagnetization. Values within the material range do not guarantee the allowable temperature of the complete assembly.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 30x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 20.06 kg / 44.23 pounds
4 689 Gs
3.01 kg / 6.63 pounds
3010 g / 29.5 N
 N/A
1 mm 17.63 kg / 38.86 pounds
6 174 Gs
2.64 kg / 5.83 pounds
2644 g / 25.9 N
 15.86 kg / 34.98 pounds
~0 Gs
2 mm 15.19 kg / 33.49 pounds
5 732 Gs
2.28 kg / 5.02 pounds
2279 g / 22.4 N
 13.67 kg / 30.14 pounds
~0 Gs
3 mm 12.92 kg / 28.47 pounds
5 285 Gs
1.94 kg / 4.27 pounds
1937 g / 19.0 N
 11.62 kg / 25.63 pounds
~0 Gs
5 mm 9.08 kg / 20.03 pounds
4 432 Gs
1.36 kg / 3.00 pounds
1363 g / 13.4 N
 8.18 kg / 18.02 pounds
~0 Gs
10 mm 3.61 kg / 7.96 pounds
2 795 Gs
0.54 kg / 1.19 pounds
542 g / 5.3 N
 3.25 kg / 7.17 pounds
~0 Gs
20 mm 0.70 kg / 1.54 pounds
1 230 Gs
0.10 kg / 0.23 pounds
105 g / 1.0 N
 0.63 kg / 1.39 pounds
~0 Gs
50 mm 0.02 kg / 0.05 pounds
217 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
60 mm 0.01 kg / 0.02 pounds
141 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 / 0.01 pounds
96 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
68 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
50 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
38 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets attract each other from a significantly greater distance than a magnet and steel setup. The connection of two magnets produces a massive flux and a wider radius of action. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the impact force is huge. The repulsion force is a bit weaker than the attraction, but still significant.
*Flux density between like poles drops to ~0 Gs at the midpoint of the gap (due to field cancellation).
* Calculations refer to friction force of two same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Axial field levels — not safety zones
MPL 30x10x5 / N38

Field level (Gs) mT Model distance (cm)
< 5 Gs < 0.5 mT 8.5 cm
< 10 Gs < 1.0 mT 6.5 cm
< 20 Gs < 2.0 mT 5.0 cm
< 40 Gs < 4.0 mT 4.0 cm
< 50 Gs < 5.0 mT 3.5 cm
< 400 Gs < 40.0 mT 1.5 cm
< 600 Gs < 60.0 mT 1.5 cm
Reference field levels for a model of one magnet, on its axis in air, with a 5 mm distance step. These are not device immunity limits or safe distances for implants. Do not use this table to assess the safety of a pacemaker, defibrillator or other implant; follow the device manufacturer’s and your clinician’s guidance. Steel and other magnets change the field distribution.

Table 8: Collisions (kinetic energy) - collision effects
MPL 30x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.33 km/h
(6.76 m/s)
 0.26 J
30 mm 24.87 km/h
(6.91 m/s)
 0.27 J
50 mm 24.88 km/h
(6.91 m/s)
 0.27 J
100 mm 24.88 km/h
(6.91 m/s)
 0.27 J
Magnetic elements are delicate – a strong collision with metal risks their cracking. Pay attention to connection velocity – a magnet released freely becomes dangerous. Kinetic force can trigger coating fragments or dangerous crushing to fingers. Hold the magnet firmly during mounting so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Surface protection spec
MPL 30x10x5 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)
The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MPL 30x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 370 Mx 93.7 µWb
Pc Coefficient 0.35 Low (Flat)
Total magnetic flux passing through the magnet pole. Key data for generator designers and motors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MPL 30x10x5 / N38

Environment Effective steel pull Effect
Air (land) 8.89 kg Standard
Water (riverbed) 10.18 kg
(+1.29 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Wall mount (shear)

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) significantly reduces the holding force.

3. Heat tolerance

N38: the maximum material working temperature is 80°C. Permitted conditions also depend on the shape and magnetic circuit.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.35

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.

Engineering data and GPSR

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%

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: 020138-2026
Measurement Calculator

Magnet pull force

Magnetic Induction

Simply fill in one field, to let the calculator fill in everything else automatically.

Other offers

MPL 10x5x1.5 / N38 - lamellar magnet
Product available Ships tomorrow

MPL 10x5x1.5 / N38 - lamellar magnet

0.381 zł brutto / pcs
SM 32x475 [2xM8] / N52 - magnetic separator
Product available Ships tomorrow

SM 32x475 [2xM8] / N52 - magnetic separator

1488.30 zł brutto / pcs
SM 28x150 [2xM8] / N52 - magnetic separator
Product available Ships tomorrow

SM 28x150 [2xM8] / N52 - magnetic separator

528.90 zł brutto / pcs
ZK XLINK 1026 elementów - construction toy
Product available Ships tomorrow

ZK XLINK 1026 elementów - construction toy

79.90 zł brutto / pcs
This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 30x10x5 mm and a weight of 11.25 g, guarantees premium class connection. This magnetic block with a force of 87.23 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is sliding the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 30x10x5 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 30x10x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 30x10x5 / N38, we recommend utilizing strong epoxy glues (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 30x10x5 mm, which, at a weight of 11.25 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 30x10x5 mm and a self-weight of 11.25 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of Nd2Fe14B magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They do not lose strength, even after nearly 10 years – the reduction in lifting capacity is only ~1% (based on measurements),
  • They feature excellent resistance to weakening of magnetic properties as a result of external fields,
  • By applying a shiny coating of nickel, the element has an modern look,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Due to the possibility of precise forming and customization to specialized projects, NdFeB magnets can be modeled in a variety of geometric configurations, which increases their versatility,
  • Wide application in high-tech industry – they are used in magnetic memories, brushless drives, precision medical tools, also multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • Do not exceed this material temperature limit: 80°C. Overheating may permanently weaken the magnet.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited ability of creating threads in the magnet and complicated shapes - preferred is casing - magnetic holder.
  • Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Maximum lifting force for a neodymium magnet – what contributes to it?

The force parameter is a measurement result performed under specific, ideal conditions:
  • with the contact of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • whose thickness equals approx. 10 mm
  • with a surface free of scratches
  • with total lack of distance (no impurities)
  • for force acting at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

Real force impacted by working environment parameters, mainly (from priority):
  • Distance – existence of any layer (rust, dirt, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Material type – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Temperature – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Warnings
Danger to the youngest

These products are not suitable for play. Swallowing a few magnets may result in them attracting across intestines, which constitutes a severe health hazard and requires urgent medical intervention.

Phone sensors

GPS units and mobile phones are extremely susceptible to magnetism. Close proximity with a strong magnet can ruin the internal compass in your phone.

Handling guide

Handle with care. Neodymium magnets act from a long distance and snap with massive power, often faster than you can react.

Magnet fragility

NdFeB magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets leads to them shattering into small pieces.

Warning for heart patients

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

Crushing risk

Pinching hazard: The pulling power is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Fire warning

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Demagnetization risk

Do not exceed the maximum operating temperature stated in the specifications of the particular product. The limit depends on the material, geometry and operating arrangement; there is no single threshold for all neodymium magnets. Overheating can permanently weaken a magnet.

Safe distance

Powerful magnetic fields can erase data on credit cards, HDDs, and storage devices. Keep a distance of at least 10 cm.

Sensitization to coating

A percentage of the population experience a sensitization to Ni, which is the standard coating for NdFeB magnets. Frequent touching might lead to dermatitis. We suggest wear protective gloves.

Important! More info about risks in the article: Safety of working with magnets.