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MW 38x3.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010062

GTIN/EAN: 5906301810612

5.00
Load capacity 5.09 kg / 49.91 N Magnetic Induction 112.31 mT / 1123 Gs
Diameter Ø
38 mm [±0,1 mm]
Height
3.5 mm [±0,1 mm]
Weight
29.77 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
check parameters »

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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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Technical specification of the product - MW 38x3.5 / N38 - cylindrical magnet

Specification / characteristics - MW 38x3.5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010062
GTIN/EAN 5906301810612
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 38 mm [±0,1 mm]
Height 3.5 mm [±0,1 mm]
Weight 29.77 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.09 kg / 49.91 N
Magnetic Induction ~ ? 112.31 mT / 1123 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 38x3.5 / N38 - cylindrical magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Physical simulation of the product - technical parameters

Presented values are the result of a physical analysis. Values are based on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs gap) - characteristics
MW 38x3.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1123 Gs
112.3 mT
 5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
 warning
1 mm 1103 Gs
110.3 mT
 4.91 kg / 10.82 LBS
4910.1 g / 48.2 N
 warning
2 mm 1075 Gs
107.5 mT
 4.66 kg / 10.28 LBS
4663.0 g / 45.7 N
 warning
3 mm 1040 Gs
104.0 mT
 4.36 kg / 9.62 LBS
4364.2 g / 42.8 N
 warning
5 mm 954 Gs
95.4 mT
 3.67 kg / 8.10 LBS
3673.1 g / 36.0 N
 warning
10 mm 703 Gs
70.3 mT
 2.00 kg / 4.40 LBS
1997.1 g / 19.6 N
 weak grip
15 mm 483 Gs
48.3 mT
 0.94 kg / 2.08 LBS
943.2 g / 9.3 N
 weak grip
20 mm 326 Gs
32.6 mT
 0.43 kg / 0.95 LBS
429.7 g / 4.2 N
 weak grip
30 mm 155 Gs
15.5 mT
 0.10 kg / 0.21 LBS
97.1 g / 1.0 N
 weak grip
50 mm 47 Gs
4.7 mT
 0.01 kg / 0.02 LBS
8.9 g / 0.1 N
 weak grip
Grip strength decreases significantly with every subsequent millimeter of gap. Remember that even the smallest gap (e.g., dirt, paint, dust) noticeably diminishes the holding power. Neodymiums operate strongest during direct contact; air break kills the force. Observe how quickly the parameters plummet, when the magnet does not adhere directly to the steel surface. When planning the arrangement, discard unnecessary gaps.

Table 2: Shear hold (wall)
MW 38x3.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.02 kg / 2.24 LBS
1018.0 g / 10.0 N
1 mm Stal (~0.2) 0.98 kg / 2.16 LBS
982.0 g / 9.6 N
2 mm Stal (~0.2) 0.93 kg / 2.05 LBS
932.0 g / 9.1 N
3 mm Stal (~0.2) 0.87 kg / 1.92 LBS
872.0 g / 8.6 N
5 mm Stal (~0.2) 0.73 kg / 1.62 LBS
734.0 g / 7.2 N
10 mm Stal (~0.2) 0.40 kg / 0.88 LBS
400.0 g / 3.9 N
15 mm Stal (~0.2) 0.19 kg / 0.41 LBS
188.0 g / 1.8 N
20 mm Stal (~0.2) 0.09 kg / 0.19 LBS
86.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 LBS
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
This section calculates the approximate holding capacity sufficient to initiate the downward movement of the magnet down against a upright metal surface (considering typical friction coefficient). The holding force varies with the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MW 38x3.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.53 kg / 3.37 LBS
1527.0 g / 15.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.02 kg / 2.24 LBS
1018.0 g / 10.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.51 kg / 1.12 LBS
509.0 g / 5.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.55 kg / 5.61 LBS
2545.0 g / 25.0 N
When mounting a magnet on a vertical wall (e.g., a car body), it will maintain only about 1/5 of nominal attraction strength. Gravity and a weak degree of grip influence the fact that magnets slide down faster than they pull off. Planning a vertical fastening? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a much lighter weight. Utilizing a rubberized pad can drastically improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MW 38x3.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.51 kg / 1.12 LBS
509.0 g / 5.0 N
1 mm
25%
 1.27 kg / 2.81 LBS
1272.5 g / 12.5 N
2 mm
50%
 2.55 kg / 5.61 LBS
2545.0 g / 25.0 N
3 mm
75%
 3.82 kg / 8.42 LBS
3817.5 g / 37.4 N
5 mm
100%
 5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
10 mm
100%
 5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
11 mm
100%
 5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
12 mm
100%
 5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
A too thin steel is incapable of absorb the entire magnetic field, which weakens actual performance of the magnet. If you mount a strong magnet to a too thin substrate, the field will pass right through and the holding will be smaller. To utilize 100% of this magnet's power, you require a sufficiently solid piece of metal. The material oversaturation causes that on thin elements (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel cross-section according to the table below.

Table 5: Thermal resistance (stability) - power drop
MW 38x3.5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
 OK
40 °C -2.2% 4.98 kg / 10.97 LBS
4978.0 g / 48.8 N
 OK
60 °C -4.4% 4.87 kg / 10.73 LBS
4866.0 g / 47.7 N
80 °C -6.6% 4.75 kg / 10.48 LBS
4754.1 g / 46.6 N
100 °C -28.8% 3.62 kg / 7.99 LBS
3624.1 g / 35.6 N
Ordinary NdFeB products irreversibly lose strength after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently destroy this product. With every degree above norm, the neodymium's power temporarily decreases. Do not use this product close to ovens higher than its working range. Exceeding the critical threshold will cause irreversible degradation of magnetism.
*Technical advisory: Thermal stability depends not only on the material grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures compared to rod magnets. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 38x3.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 8.82 kg / 19.44 LBS
2 143 Gs
1.32 kg / 2.92 LBS
1323 g / 13.0 N
 N/A
1 mm 8.68 kg / 19.13 LBS
2 228 Gs
1.30 kg / 2.87 LBS
1302 g / 12.8 N
 7.81 kg / 17.22 LBS
~0 Gs
2 mm 8.51 kg / 18.75 LBS
2 206 Gs
1.28 kg / 2.81 LBS
1276 g / 12.5 N
 7.66 kg / 16.88 LBS
~0 Gs
3 mm 8.31 kg / 18.31 LBS
2 180 Gs
1.25 kg / 2.75 LBS
1246 g / 12.2 N
 7.47 kg / 16.48 LBS
~0 Gs
5 mm 7.83 kg / 17.26 LBS
2 116 Gs
1.17 kg / 2.59 LBS
1174 g / 11.5 N
 7.05 kg / 15.53 LBS
~0 Gs
10 mm 6.36 kg / 14.03 LBS
1 908 Gs
0.95 kg / 2.10 LBS
955 g / 9.4 N
 5.73 kg / 12.63 LBS
~0 Gs
20 mm 3.46 kg / 7.63 LBS
1 407 Gs
0.52 kg / 1.14 LBS
519 g / 5.1 N
 3.11 kg / 6.87 LBS
~0 Gs
50 mm 0.35 kg / 0.76 LBS
445 Gs
0.05 kg / 0.11 LBS
52 g / 0.5 N
 0.31 kg / 0.69 LBS
~0 Gs
60 mm 0.17 kg / 0.37 LBS
310 Gs
0.03 kg / 0.06 LBS
25 g / 0.2 N
 0.15 kg / 0.33 LBS
~0 Gs
70 mm 0.09 kg / 0.19 LBS
222 Gs
0.01 kg / 0.03 LBS
13 g / 0.1 N
 0.08 kg / 0.17 LBS
~0 Gs
80 mm 0.05 kg / 0.10 LBS
163 Gs
0.01 kg / 0.02 LBS
7 g / 0.1 N
 0.04 kg / 0.09 LBS
~0 Gs
90 mm 0.03 kg / 0.06 LBS
122 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
100 mm 0.02 kg / 0.03 LBS
94 Gs
0.00 kg / 0.01 LBS
2 g / 0.0 N
 0.01 kg / 0.03 LBS
~0 Gs
Two magnetic products attract each other from a wider radius than a neodymium and metal combination. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of performance. Want to build a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the collision energy is massive. The repulsion force is marginally weaker than the connection force, but still significant.
*The magnetic induction between like poles is approximately ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
* Estimates demonstrate shear force of a pair of identical magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (electronics) - precautionary measures
MW 38x3.5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.5 cm
Hearing aid 10 Gs (1.0 mT) 9.0 cm
Timepiece 20 Gs (2.0 mT) 7.0 cm
Mobile device 40 Gs (4.0 mT) 5.5 cm
Remote 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Powerful magnet radiation poses a large risk to IT equipment as well as pacemakers. These magnets generate a flux that prevents correct functioning of digital equipment. Remember: the unseen radiation passes through tissues and glass. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MW 38x3.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.62 km/h
(4.90 m/s)
 0.36 J
30 mm 20.44 km/h
(5.68 m/s)
 0.48 J
50 mm 20.58 km/h
(5.72 m/s)
 0.49 J
100 mm 20.60 km/h
(5.72 m/s)
 0.49 J
Magnetic elements are delicate – a strong collision with metal can result in shattering. Control the attraction moment – a magnet released freely turns into a projectile. Impact energy can destroy the magnet or dangerous crushing to skin. Always hold the magnet during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when playing with powerful specimens.

Table 9: Coating parameters (durability)
MW 38x3.5 / 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 (Flux)
MW 38x3.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 17 022 Mx 170.2 µWb
Pc Coefficient 0.14 Low (Flat)
Flux value passing through the magnet pole. Essential parameter when building generators as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
MW 38x3.5 / N38

Environment Effective steel pull Effect
Air (land) 5.09 kg Standard
Water (riverbed) 5.83 kg
(+0.74 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. 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)

*Caution: On a vertical wall, the magnet holds merely a fraction of its nominal pull.

2. Efficiency vs thickness

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

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.14

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 specification and ecology

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%

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: 010062-2026
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This product is an incredibly powerful cylindrical magnet, composed of modern NdFeB material, which, with dimensions of Ø38x3.5 mm, guarantees the highest energy density. The MW 38x3.5 / N38 component boasts an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 5.09 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 49.91 N with a weight of only 29.77 g, this rod 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., 38.1 mm) using two-component epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are strong enough for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø38x3.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø38x3.5 mm, which, at a weight of 29.77 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 5.09 kg (force ~49.91 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 38 mm. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Strengths as well as weaknesses of neodymium magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (according to literature),
  • They are noted for resistance to demagnetization induced by external magnetic fields,
  • The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to freedom in designing and the capacity to adapt to client solutions,
  • Significant place in electronics industry – they are utilized in computer drives, drive modules, medical devices, and industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Limitations

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic mount, due to difficulties in producing nuts inside the magnet and complex forms.
  • Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is a challenge,

Pull force analysis

Highest magnetic holding force – what contributes to it?

Holding force of 5.09 kg is a theoretical maximum value conducted under standard conditions:
  • using a sheet made of low-carbon steel, functioning as a ideal flux conductor
  • whose thickness is min. 10 mm
  • with a surface perfectly flat
  • under conditions of no distance (surface-to-surface)
  • under vertical force vector (90-degree angle)
  • at standard ambient temperature

Practical lifting capacity: influencing factors

Please note that the application force will differ influenced by the following factors, in order of importance:
  • Air gap (betwixt the magnet and the plate), because even a very small distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Base massiveness – too thin steel causes magnetic saturation, causing part of the flux to be lost into the air.
  • Material composition – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
  • Smoothness – full contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance between the magnet and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets
Magnet fragility

Protect your eyes. Magnets can explode upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Impact on smartphones

GPS units and smartphones are extremely susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Dust explosion hazard

Mechanical processing of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Conscious usage

Handle with care. Rare earth magnets act from a distance and snap with massive power, often quicker than you can move away.

Life threat

For implant holders: Powerful magnets affect medical devices. Maintain at least 30 cm distance or request help to handle the magnets.

Choking Hazard

Adult use only. Tiny parts can be swallowed, leading to serious injuries. Store out of reach of children and animals.

Protect data

Equipment safety: Strong magnets can damage data carriers and delicate electronics (heart implants, medical aids, timepieces).

Nickel coating and allergies

Some people have a sensitization to nickel, which is the standard coating for NdFeB magnets. Extended handling may cause skin redness. It is best to use protective gloves.

Pinching danger

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

Heat sensitivity

Monitor thermal conditions. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.

Security! Learn more about hazards in the article: Magnet Safety Guide.