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MW 100x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010001

GTIN/EAN: 5906301810018

5.00

Diameter Ø

100 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

589.05 g

Magnetization Direction

↑ axial

Load capacity

40.86 kg / 400.80 N

Magnetic Induction

121.59 mT / 1216 Gs

Coating

[NiCuNi] Nickel

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368.50 ZŁ with VAT / pcs + price for transport

299.59 ZŁ net + 23% VAT / pcs

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Physical properties - MW 100x10 / N38 - cylindrical magnet

Specification / characteristics - MW 100x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010001
GTIN/EAN 5906301810018
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 100 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 589.05 g
Magnetization Direction ↑ axial
Load capacity ~ ? 40.86 kg / 400.80 N
Magnetic Induction ~ ? 121.59 mT / 1216 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 100x10 / 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

Technical modeling of the assembly - data

Presented information represent the outcome of a mathematical analysis. Results are based on algorithms for the class Nd2Fe14B. Operational performance may deviate from the simulation results. Treat these data as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - interaction chart
MW 100x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1216 Gs
121.6 mT
 40.86 kg / 90.08 pounds
40860.0 g / 400.8 N
 dangerous!
1 mm 1208 Gs
120.8 mT
 40.35 kg / 88.95 pounds
40345.4 g / 395.8 N
 dangerous!
2 mm 1199 Gs
119.9 mT
 39.74 kg / 87.62 pounds
39742.7 g / 389.9 N
 dangerous!
3 mm 1189 Gs
118.9 mT
 39.06 kg / 86.12 pounds
39062.0 g / 383.2 N
 dangerous!
5 mm 1165 Gs
116.5 mT
 37.49 kg / 82.65 pounds
37490.2 g / 367.8 N
 dangerous!
10 mm 1087 Gs
108.7 mT
 32.64 kg / 71.96 pounds
32640.7 g / 320.2 N
 dangerous!
15 mm 991 Gs
99.1 mT
 27.15 kg / 59.86 pounds
27153.9 g / 266.4 N
 dangerous!
20 mm 887 Gs
88.7 mT
 21.76 kg / 47.97 pounds
21758.7 g / 213.5 N
 dangerous!
30 mm 683 Gs
68.3 mT
 12.90 kg / 28.45 pounds
12902.7 g / 126.6 N
 dangerous!
50 mm 379 Gs
37.9 mT
 3.97 kg / 8.75 pounds
3968.4 g / 38.9 N
 strong
Pulling power decreases significantly with every mm of spacing. Remember that even a very thin break (e.g., contamination, varnish, veneer) significantly weakens the grip. Magnetic products work strongest at the point of direct contact; gap kills the force. Observe how flashily the load capacity fall, when the magnet does not touch directly to the metal substrate. When planning the mounting, avoid redundant distances.

Table 2: Vertical hold (wall)
MW 100x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 8.17 kg / 18.02 pounds
8172.0 g / 80.2 N
1 mm Stal (~0.2) 8.07 kg / 17.79 pounds
8070.0 g / 79.2 N
2 mm Stal (~0.2) 7.95 kg / 17.52 pounds
7948.0 g / 78.0 N
3 mm Stal (~0.2) 7.81 kg / 17.22 pounds
7812.0 g / 76.6 N
5 mm Stal (~0.2) 7.50 kg / 16.53 pounds
7498.0 g / 73.6 N
10 mm Stal (~0.2) 6.53 kg / 14.39 pounds
6528.0 g / 64.0 N
15 mm Stal (~0.2) 5.43 kg / 11.97 pounds
5430.0 g / 53.3 N
20 mm Stal (~0.2) 4.35 kg / 9.59 pounds
4352.0 g / 42.7 N
30 mm Stal (~0.2) 2.58 kg / 5.69 pounds
2580.0 g / 25.3 N
50 mm Stal (~0.2) 0.79 kg / 1.75 pounds
794.0 g / 7.8 N
The table below shows the theoretical weight limit necessary to cause the slippage of the magnet downwards along a vertical steel wall (assuming standard friction coefficient). The holding force is a function of the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 100x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
12.26 kg / 27.02 pounds
12258.0 g / 120.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
8.17 kg / 18.02 pounds
8172.0 g / 80.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.09 kg / 9.01 pounds
4086.0 g / 40.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
20.43 kg / 45.04 pounds
20430.0 g / 200.4 N
When hanging a element on a upright wall (e.g., a board), it you can count on barely approx. 1/5 of nominal attraction strength. Gravity and a weak degree of grip cause that magnets slip faster than they pop off the substrate. Designing a wall mount? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the holder will give way down under a noticeably lighter load. Utilizing a rubberized pad can effectively improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 100x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 2.04 kg / 4.50 pounds
2043.0 g / 20.0 N
1 mm
13%
 5.11 kg / 11.26 pounds
5107.5 g / 50.1 N
2 mm
25%
 10.22 kg / 22.52 pounds
10215.0 g / 100.2 N
3 mm
38%
 15.32 kg / 33.78 pounds
15322.5 g / 150.3 N
5 mm
63%
 25.54 kg / 56.30 pounds
25537.5 g / 250.5 N
10 mm
100%
 40.86 kg / 90.08 pounds
40860.0 g / 400.8 N
11 mm
100%
 40.86 kg / 90.08 pounds
40860.0 g / 400.8 N
12 mm
100%
 40.86 kg / 90.08 pounds
40860.0 g / 400.8 N
A thin sheet is incapable of take in the full magnetic flux, which squanders power of the holder. Should you mount a strong magnet to a too thin substrate, the magnetism will pass right through and the pull force will drop sharply. To squeeze the maximum of this magnet's potential, you need a suitably thick piece of steel. The material oversaturation means that on sheet metal structures (e.g., appliance housings), the holder shows lower pull force. We recommend selecting the steel dimension according to the table below.

Table 5: Working in heat (stability) - thermal limit
MW 100x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 40.86 kg / 90.08 pounds
40860.0 g / 400.8 N
 OK
40 °C -2.2% 39.96 kg / 88.10 pounds
39961.1 g / 392.0 N
 OK
60 °C -4.4% 39.06 kg / 86.12 pounds
39062.2 g / 383.2 N
80 °C -6.6% 38.16 kg / 84.14 pounds
38163.2 g / 374.4 N
100 °C -28.8% 29.09 kg / 64.14 pounds
29092.3 g / 285.4 N
Standard neodymium magnets change their properties power after exceeding the maximum temperature. Protect against heat – excessive heat can permanently destroy this magnet. With every degree above norm, the magnet's capacity briefly lowers. Do not use this product close to heaters higher than its working range. Exceeding the critical threshold will cause irreversible degradation of magnetism.
*Engineering note: Temperature resistance is determined by both grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures than long magnets. Warning indicator in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 100x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 71.58 kg / 157.80 pounds
2 302 Gs
10.74 kg / 23.67 pounds
10737 g / 105.3 N
 N/A
1 mm 71.15 kg / 156.86 pounds
2 424 Gs
10.67 kg / 23.53 pounds
10673 g / 104.7 N
 64.04 kg / 141.17 pounds
~0 Gs
2 mm 70.68 kg / 155.82 pounds
2 416 Gs
10.60 kg / 23.37 pounds
10602 g / 104.0 N
 63.61 kg / 140.23 pounds
~0 Gs
3 mm 70.17 kg / 154.69 pounds
2 408 Gs
10.53 kg / 23.20 pounds
10525 g / 103.3 N
 63.15 kg / 139.22 pounds
~0 Gs
5 mm 69.04 kg / 152.21 pounds
2 388 Gs
10.36 kg / 22.83 pounds
10356 g / 101.6 N
 62.14 kg / 136.99 pounds
~0 Gs
10 mm 65.68 kg / 144.79 pounds
2 329 Gs
9.85 kg / 21.72 pounds
9851 g / 96.6 N
 59.11 kg / 130.31 pounds
~0 Gs
20 mm 57.18 kg / 126.06 pounds
2 173 Gs
8.58 kg / 18.91 pounds
8577 g / 84.1 N
 51.46 kg / 113.45 pounds
~0 Gs
50 mm 29.67 kg / 65.40 pounds
1 565 Gs
4.45 kg / 9.81 pounds
4450 g / 43.7 N
 26.70 kg / 58.86 pounds
~0 Gs
60 mm 22.60 kg / 49.83 pounds
1 366 Gs
3.39 kg / 7.47 pounds
3390 g / 33.3 N
 20.34 kg / 44.85 pounds
~0 Gs
70 mm 16.98 kg / 37.43 pounds
1 184 Gs
2.55 kg / 5.61 pounds
2546 g / 25.0 N
 15.28 kg / 33.68 pounds
~0 Gs
80 mm 12.64 kg / 27.87 pounds
1 022 Gs
1.90 kg / 4.18 pounds
1896 g / 18.6 N
 11.38 kg / 25.08 pounds
~0 Gs
90 mm 9.38 kg / 20.67 pounds
880 Gs
1.41 kg / 3.10 pounds
1406 g / 13.8 N
 8.44 kg / 18.60 pounds
~0 Gs
100 mm 6.95 kg / 15.33 pounds
758 Gs
1.04 kg / 2.30 pounds
1043 g / 10.2 N
 6.26 kg / 13.79 pounds
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and sheet combination. Such a system of magnet-to-magnet produces a massive flux and a larger range of performance. Designing a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the impact force is massive. The repulsion force is marginally weaker than the attraction, but still impressive.
*Flux density between like poles drops to ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Attention: Results demonstrate sliding force of two same neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (electronics) - warnings
MW 100x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 31.0 cm
Hearing aid 10 Gs (1.0 mT) 24.0 cm
Timepiece 20 Gs (2.0 mT) 19.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 14.5 cm
Car key 50 Gs (5.0 mT) 13.5 cm
Payment card 400 Gs (40.0 mT) 5.0 cm
HDD hard drive 600 Gs (60.0 mT) 3.5 cm
Powerful magnet radiation is a serious hazard to IT equipment and medical implants. These neodymiums generate a flux that disrupts operation of digital equipment. Be aware: the unseen radiation penetrates the body and glass. Increased vigilance must be taken by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MW 100x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 11.87 km/h
(3.30 m/s)
 3.20 J
30 mm 17.18 km/h
(4.77 m/s)
 6.71 J
50 mm 19.89 km/h
(5.52 m/s)
 8.99 J
100 mm 26.67 km/h
(7.41 m/s)
 16.17 J
NdFeB products are prone to chipping – a strong collision with metal causes immediate chipping. Watch the impact speed – a neodymium left loose turns into a projectile. Striking energy can trigger coating fragments or painful pinches to skin. Hold the magnet firmly 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 safety glasses when working with large magnets.

Table 9: Surface protection spec
MW 100x10 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 100x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 125 951 Mx 1259.5 µWb
Pc Coefficient 0.16 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter in coil applications as well as sensors. Pc value defines the working geometry.

Table 11: Underwater work (magnet fishing)
MW 100x10 / N38

Environment Effective steel pull Effect
Air (land) 40.86 kg Standard
Water (riverbed) 46.78 kg
(+5.92 kg buoyancy gain)
+14.5%
Rust risk: 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Shear force

*Note: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.16

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%
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: 010001-2026
Magnet Unit Converter
Pulling force
Field Strength
Input your figure into a field, and the remaining units change automatically.

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The offered product is an exceptionally strong cylinder magnet, composed of advanced NdFeB material, which, at dimensions of Ø100x10 mm, guarantees maximum efficiency. The MW 100x10 / N38 model features a tolerance of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 40.86 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 400.80 N with a weight of only 589.05 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 100.1 mm) using two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø100x10), 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 Ø100x10 mm, which, at a weight of 589.05 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 40.86 kg (force ~400.80 N), which, with such defined dimensions, proves the high grade of the NdFeB material. 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 100 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 diametrically if your project requires it.

Strengths as well as weaknesses of neodymium magnets.

Advantages

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (based on calculations),
  • Magnets perfectly defend themselves against demagnetization caused by external fields,
  • Thanks to the shiny finish, the surface of nickel, gold, or silver gives an professional appearance,
  • They show high magnetic induction at the operating surface, making them more effective,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Considering the ability of accurate molding and customization to custom solutions, neodymium magnets can be produced in a variety of forms and dimensions, which amplifies use scope,
  • Huge importance in modern industrial fields – they find application in hard drives, electric motors, medical equipment, and modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Limitations

Drawbacks and weaknesses of neodymium magnets: application proposals
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets lose their strength 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
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Pull force analysis

Detachment force of the magnet in optimal conditions – what contributes to it?

The force parameter is a theoretical maximum value executed under the following configuration:
  • on a block made of structural steel, perfectly concentrating the magnetic field
  • with a cross-section no less than 10 mm
  • characterized by even structure
  • with direct contact (without paint)
  • under axial force vector (90-degree angle)
  • at conditions approx. 20°C

Practical lifting capacity: influencing factors

In real-world applications, the real power depends on a number of factors, listed from crucial:
  • Gap between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Chemical composition of the base – mild steel attracts best. Alloy admixtures lower magnetic properties and lifting capacity.
  • Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet and the plate reduces the lifting capacity.

Safe handling of NdFeB magnets
Bone fractures

Large magnets can crush fingers instantly. Never put your hand betwixt two strong magnets.

Metal Allergy

A percentage of the population have a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Extended handling can result in an allergic reaction. We recommend wear safety gloves.

Protective goggles

Despite metallic appearance, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Danger to pacemakers

Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Impact on smartphones

Be aware: rare earth magnets generate a field that disrupts precision electronics. Keep a safe distance from your mobile, device, and navigation systems.

Threat to electronics

Avoid bringing magnets close to a wallet, laptop, or TV. The magnetism can destroy these devices and wipe information from cards.

Swallowing risk

Absolutely store magnets out of reach of children. Choking hazard is significant, and the effects of magnets clamping inside the body are life-threatening.

Flammability

Mechanical processing of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Safe operation

Exercise caution. Rare earth magnets act from a long distance and connect with huge force, often faster than you can react.

Operating temperature

Keep cool. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, look for special high-temperature series (H, SH, UH).

Caution! More info about hazards in the article: Safety of working with magnets.