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MPL 30x3x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020585

GTIN/EAN: 5906301815785

Load capacity 3.14 kg / 30.79 N Magnetic Induction 367.55 mT / 3676 Gs
length
30 mm [±0,1 mm]
Width
3 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
1.35 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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0.780 zł net / pcs

0.959 zł with VAT (23% VAT) / pcs

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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.

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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.

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Technical - MPL 30x3x2 / N38 - lamellar magnet

Specification / characteristics - MPL 30x3x2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020585
GTIN/EAN 5906301815785
Distributor Dhit sp. z o.o.
Country of origin Poland / China / Germany
Customs code 85059029
length 30 mm [±0,1 mm]
Width 3 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 1.35 g
Magnetization Direction ↑ axial
Load capacity ~ ? 3.14 kg / 30.79 N
Magnetic Induction ~ ? 367.55 mT / 3676 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x3x2 / 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

Engineering analysis of the assembly - report

The following information constitute the result of a physical calculation. Values are based on models for the material Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Use these data as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - characteristics
MPL 30x3x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3669 Gs
366.9 mT
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
 warning
1 mm 2074 Gs
207.4 mT
 1.00 kg / 2.21 lbs
1003.5 g / 9.8 N
 low risk
2 mm 1148 Gs
114.8 mT
 0.31 kg / 0.68 lbs
307.3 g / 3.0 N
 low risk
3 mm 702 Gs
70.2 mT
 0.11 kg / 0.25 lbs
115.0 g / 1.1 N
 low risk
5 mm 336 Gs
33.6 mT
 0.03 kg / 0.06 lbs
26.3 g / 0.3 N
 low risk
10 mm 106 Gs
10.6 mT
 0.00 kg / 0.01 lbs
2.6 g / 0.0 N
 low risk
15 mm 48 Gs
4.8 mT
 0.00 kg / 0.00 lbs
0.5 g / 0.0 N
 low risk
20 mm 26 Gs
2.6 mT
 0.00 kg / 0.00 lbs
0.2 g / 0.0 N
 low risk
30 mm 10 Gs
1.0 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
50 mm 2 Gs
0.2 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
Pulling power weakens sharply with every subsequent millimeter of distance. Remember that every additional insulation layer (e.g., contamination, paint, rust) strongly weakens the grip. Magnetic products work most effectively at the point of direct contact; air break weakens the force. See how flashily the load capacity drop, when the magnet does not touch directly to the metal substrate. When designing the assembly, eliminate additional spacers.

Table 2: Sliding load (wall)
MPL 30x3x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Raw steel (µ ≈ 0.2) 0.63 kg / 1.38 lbs
628.0 g / 6.2 N
1 mm Raw steel (µ ≈ 0.2) 0.20 kg / 0.44 lbs
200.0 g / 2.0 N
2 mm Raw steel (µ ≈ 0.2) 0.06 kg / 0.14 lbs
62.0 g / 0.6 N
3 mm Raw steel (µ ≈ 0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
5 mm Raw steel (µ ≈ 0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
10 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
15 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
20 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
30 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Raw steel (µ ≈ 0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The following data indicates the theoretical shear load needed to cause the sliding of the magnet down along a vertical steel plate (assuming typical friction coefficient). The holding force is a function of the air gap between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 30x3x2 / N38

Surface type Friction coefficient / % Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% of nominal force
0.94 kg / 2.08 lbs
942.0 g / 9.2 N
Painted steel (standard)
µ = 0.2 20% of nominal force
0.63 kg / 1.38 lbs
628.0 g / 6.2 N
Oily/slippery steel
µ = 0.1 10% of nominal force
0.31 kg / 0.69 lbs
314.0 g / 3.1 N
Magnet with anti-slip rubber
µ = 0.5 50% of nominal force
1.57 kg / 3.46 lbs
1570.0 g / 15.4 N
When hanging a magnet on a vertical wall (e.g., a car body), it will maintain just about 20%-30% of nominal attraction strength. Gravitational force as well as a weak degree of grip cause that products slide down faster than they pop off the substrate. Designing a wall mount? Note that the sliding force is noticeably lower than the maximum static pull force. On a slippery surface, the magnet will slip down under a significantly smaller weight. Utilizing a rubberized pad can significantly increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 30x3x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.31 kg / 0.69 lbs
314.0 g / 3.1 N
1 mm
25%
 0.79 kg / 1.73 lbs
785.0 g / 7.7 N
2 mm
50%
 1.57 kg / 3.46 lbs
1570.0 g / 15.4 N
3 mm
75%
 2.36 kg / 5.19 lbs
2355.0 g / 23.1 N
5 mm
100%
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
10 mm
100%
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
11 mm
100%
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
12 mm
100%
 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
A too thin steel is not enough to focus the full magnetic flux, which wastes potential of the holder. If you attach a powerful product to a too thin substrate, the field will pass right through and the holding will be smaller. To achieve 100% of this neodymium's potential, you require a sufficiently solid piece of steel. The material oversaturation causes that on thin elements (e.g., appliance housings), the product holds weaker. We advise picking the steel thickness from these parameters.

Table 5: Working in heat (stability) - power drop
MPL 30x3x2 / N38

Magnet temperature (°C) Force change relative to 20°C Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 3.14 kg / 6.92 lbs
3140.0 g / 30.8 N
 Estimate
40 °C -4.4% 3.00 kg / 6.62 lbs
3003.4 g / 29.5 N
 Estimate
60 °C -8.6% 2.87 kg / 6.33 lbs
2869.8 g / 28.2 N
 Estimate
80 °C -12.8% 2.74 kg / 6.04 lbs
2739.2 g / 26.9 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: Two magnets (attraction) - field collision
MPL 30x3x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 7.47 kg / 16.47 lbs
4 811 Gs
1.12 kg / 2.47 lbs
1120 g / 11.0 N
 N/A
1 mm 4.42 kg / 9.75 lbs
5 645 Gs
0.66 kg / 1.46 lbs
663 g / 6.5 N
 3.98 kg / 8.77 lbs
~0 Gs
2 mm 2.39 kg / 5.26 lbs
4 148 Gs
0.36 kg / 0.79 lbs
358 g / 3.5 N
 2.15 kg / 4.74 lbs
~0 Gs
3 mm 1.29 kg / 2.85 lbs
3 053 Gs
0.19 kg / 0.43 lbs
194 g / 1.9 N
 1.16 kg / 2.57 lbs
~0 Gs
5 mm 0.44 kg / 0.96 lbs
1 773 Gs
0.07 kg / 0.14 lbs
65 g / 0.6 N
 0.39 kg / 0.86 lbs
~0 Gs
10 mm 0.06 kg / 0.14 lbs
672 Gs
0.01 kg / 0.02 lbs
9 g / 0.1 N
 0.06 kg / 0.12 lbs
~0 Gs
20 mm 0.01 kg / 0.01 lbs
211 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
31 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
19 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
13 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
9 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
7 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
5 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 combination. The setup of two magnets creates a more powerful interaction and a further horizon of performance. Want to build a strong closure? Apply two magnets instead of a neodymium and a steel. Exercise caution that when attracting two neodymiums, the impact force is extreme. The repulsion force is slightly lower than the connection force, but still significant.
*Field value between like poles is approximately ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Attention: Calculations refer to friction force of dual same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Axial field levels — not safety zones
MPL 30x3x2 / N38

Field level (Gs) mT Model distance (cm)
< 5 Gs < 0.5 mT 4.0 cm
< 10 Gs < 1.0 mT 3.0 cm
< 20 Gs < 2.0 mT 2.5 cm
< 40 Gs < 4.0 mT 2.0 cm
< 50 Gs < 5.0 mT 1.5 cm
< 400 Gs < 40.0 mT 0.5 cm
< 600 Gs < 60.0 mT 0.5 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: Impact energy (cracking risk) - warning
MPL 30x3x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.29 km/h
(6.47 m/s)
 0.03 J
30 mm 23.32 km/h
(6.48 m/s)
 0.03 J
50 mm 23.31 km/h
(6.47 m/s)
 0.03 J
100 mm 23.32 km/h
(6.48 m/s)
 0.03 J
NdFeB products are delicate – a strong collision with metal risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Kinetic force can cause material chips or dangerous crushing to skin. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Wear eye protection when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 30x3x2 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MPL 30x3x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 295 Mx 23.0 µWb
Pc Coefficient 0.27 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MPL 30x3x2 / N38

Environment Effective steel pull Effect
Air (land) 3.14 kg Standard
Water (riverbed) 3.60 kg
(+0.46 kg buoyancy gain)
+14.5%
Rust risk: 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Sliding resistance

*Note: On a vertical wall, the magnet retains just a fraction of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) severely limits 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) = 0.27

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 specification and ecology

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%

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: 020585-2026
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Component MPL 30x3x2 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 30.79 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 3.14 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 30x3x2 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 3.14 kg), they are ideal as closers in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 30x3x2 / N38 model is magnetized axially (dimension 2 mm), which means that the N and S poles are located on its largest, flat surfaces. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
The presented product is a neodymium magnet with precisely defined parameters: 30 mm (length), 3 mm (width), and 2 mm (thickness). It is a magnetic block with dimensions 30x3x2 mm and a self-weight of 1.35 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros and cons of rare earth magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
  • Magnets perfectly defend themselves against demagnetization caused by ambient magnetic noise,
  • The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to freedom in forming and the ability to modify to unusual requirements,
  • Versatile presence in modern technologies – they find application in computer drives, electromotive mechanisms, advanced medical instruments, as well as modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Do not exceed this material temperature limit: 80°C. Overheating may permanently weaken the magnet.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited ability of producing threads in the magnet and complicated shapes - preferred is casing - magnetic holder.
  • Health risk resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. Furthermore, small elements of these magnets can be problematic in diagnostics medical in case of swallowing.
  • Due to expensive raw materials, their price is relatively high,

Holding force characteristics

Maximum magnetic pulling force – what contributes to it?

Breakaway force is the result of a measurement for optimal configuration, taking into account:
  • on a plate made of structural steel, optimally conducting the magnetic flux
  • whose transverse dimension equals approx. 10 mm
  • with a surface perfectly flat
  • without the slightest clearance between the magnet and steel
  • during detachment in a direction vertical to the plane
  • in stable room temperature

Practical aspects of lifting capacity – factors

During everyday use, the real power depends on several key aspects, presented from most significant:
  • Distance – the presence of foreign body (paint, dirt, gap) 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 shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Steel thickness – too thin plate causes magnetic saturation, causing part of the flux to be wasted into the air.
  • Plate material – mild steel gives the best results. Alloy admixtures decrease magnetic properties and lifting capacity.
  • Surface quality – the more even the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was assessed by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Precautions when working with neodymium magnets
Dust is flammable

Combustion risk: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Avoid contact if allergic

It is widely known that nickel (standard magnet coating) is a strong allergen. If you have an allergy, prevent touching magnets with bare hands and select encased magnets.

Electronic devices

Equipment safety: Neodymium magnets can ruin payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Choking Hazard

Always keep magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are fatal.

Hand protection

Risk of injury: The attraction force is so immense that it can cause blood blisters, crushing, and even bone fractures. Use thick gloves.

Implant safety

Patients with a ICD must keep an safe separation from magnets. The magnetism can stop the operation of the life-saving device.

Handling rules

Use magnets with awareness. Their immense force can surprise even professionals. Stay alert and do not underestimate their force.

Power loss in heat

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.

Material brittleness

Beware of splinters. Magnets can explode upon violent connection, launching sharp fragments into the air. Wear goggles.

Keep away from electronics

Note: rare earth magnets generate a field that interferes with precision electronics. Keep a separation from your phone, device, and navigation systems.

Important! Learn more about hazards in the article: Safety of working with magnets.