Product on order Ships in 3-5 days CO2 GPSR PPWR REACH

MPL 40x10x18 / N38 - lamellar magnet

lamellar magnet

Catalog no 020149

GTIN/EAN: 5906301811558

Load capacity 16.72 kg / 164.01 N Magnetic Induction 540.48 mT / 5405 Gs
length
40 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
18 mm [±0,1 mm]
Weight
54 g
Magnetization Direction
→ diametrical
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

view parameters »

15.00 zł net / pcs

18.45 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
15.00 zł
18.45 zł
price from 40 pcs
14.10 zł
17.34 zł
price from 170 pcs
13.20 zł
16.24 zł

Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

Guides from the knowledge base

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 of the product - MPL 40x10x18 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x18 / N38 - lamellar magnet

properties
properties values
Cat. no. 020149
GTIN/EAN 5906301811558
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 40 mm [±0,1 mm]
Width 10 mm [±0,1 mm]
Height 18 mm [±0,1 mm]
Weight 54 g
Magnetization Direction → diametrical
Load capacity ~ ? 16.72 kg / 164.01 N
Magnetic Induction ~ ? 540.48 mT / 5405 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x18 / 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

Technical simulation of the magnet - report

Presented information are the outcome of a mathematical analysis. Results rely on models for the material Nd2Fe14B. Operational performance may differ from theoretical values. Treat these data as a reference point during assembly planning.

Table 1: Static force (pull vs gap) - interaction chart
MPL 40x10x18 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5402 Gs
540.2 mT
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
 critical level
1 mm 4664 Gs
466.4 mT
 12.46 kg / 27.48 lbs
12464.6 g / 122.3 N
 critical level
2 mm 3970 Gs
397.0 mT
 9.03 kg / 19.90 lbs
9028.7 g / 88.6 N
 medium risk
3 mm 3362 Gs
336.2 mT
 6.48 kg / 14.28 lbs
6476.4 g / 63.5 N
 medium risk
5 mm 2432 Gs
243.2 mT
 3.39 kg / 7.47 lbs
3388.5 g / 33.2 N
 medium risk
10 mm 1220 Gs
122.0 mT
 0.85 kg / 1.88 lbs
853.2 g / 8.4 N
 weak grip
15 mm 703 Gs
70.3 mT
 0.28 kg / 0.62 lbs
282.9 g / 2.8 N
 weak grip
20 mm 440 Gs
44.0 mT
 0.11 kg / 0.24 lbs
111.1 g / 1.1 N
 weak grip
30 mm 203 Gs
20.3 mT
 0.02 kg / 0.05 lbs
23.6 g / 0.2 N
 weak grip
50 mm 64 Gs
6.4 mT
 0.00 kg / 0.01 lbs
2.4 g / 0.0 N
 weak grip
Magnetic force decreases sharply with every mm of spacing. Keep in mind that every additional insulation layer (e.g., contamination, paint, dust) noticeably weakens the grip. Neodymiums operate strongest at the point of direct contact; gap drastically cuts the force. See how flashily the parameters plummet, when the product does not adhere flatly to the metal substrate. When planning the arrangement, avoid unnecessary gaps.

Table 2: Vertical capacity (vertical surface)
MPL 40x10x18 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.34 kg / 7.37 lbs
3344.0 g / 32.8 N
1 mm Stal (~0.2) 2.49 kg / 5.49 lbs
2492.0 g / 24.4 N
2 mm Stal (~0.2) 1.81 kg / 3.98 lbs
1806.0 g / 17.7 N
3 mm Stal (~0.2) 1.30 kg / 2.86 lbs
1296.0 g / 12.7 N
5 mm Stal (~0.2) 0.68 kg / 1.49 lbs
678.0 g / 6.7 N
10 mm Stal (~0.2) 0.17 kg / 0.37 lbs
170.0 g / 1.7 N
15 mm Stal (~0.2) 0.06 kg / 0.12 lbs
56.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below indicates the approximate weight limit needed to start the shifting of the magnet vertically on a vertical steel wall (assuming typical friction). This parameter is relative to the separation distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 40x10x18 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.02 kg / 11.06 lbs
5016.0 g / 49.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.34 kg / 7.37 lbs
3344.0 g / 32.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.67 kg / 3.69 lbs
1672.0 g / 16.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
8.36 kg / 18.43 lbs
8360.0 g / 82.0 N
When hanging a holder on a vertical surface (e.g., a fridge), it you can count on just approx. 20%-30% of its nominal power. Gravitational force as well as a weak degree of grip cause that holders slide down easier than they detach. Designing a wall mount? Consider that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the holder will slide down under a much lighter weight. Using a rubber coating can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MPL 40x10x18 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.84 kg / 1.84 lbs
836.0 g / 8.2 N
1 mm
13%
 2.09 kg / 4.61 lbs
2090.0 g / 20.5 N
2 mm
25%
 4.18 kg / 9.22 lbs
4180.0 g / 41.0 N
3 mm
38%
 6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
5 mm
63%
 10.45 kg / 23.04 lbs
10450.0 g / 102.5 N
10 mm
100%
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
11 mm
100%
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
12 mm
100%
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
A too thin steel is not enough to conduct the full magnetic flux, which wastes potential of the magnet. Should you install a neodymium to a thin surface, the field will penetrate right through and the holding will be smaller. To squeeze the maximum of this magnet's potential, you require a sufficiently solid element of metal. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the magnet holds weaker. We recommend selecting the steel cross-section based on the following data.

Table 5: Thermal resistance (material behavior) - power drop
MPL 40x10x18 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
 OK
40 °C -2.2% 16.35 kg / 36.05 lbs
16352.2 g / 160.4 N
 OK
60 °C -4.4% 15.98 kg / 35.24 lbs
15984.3 g / 156.8 N
 OK
80 °C -6.6% 15.62 kg / 34.43 lbs
15616.5 g / 153.2 N
100 °C -28.8% 11.90 kg / 26.25 lbs
11904.6 g / 116.8 N
Standard neodymium magnets irreversibly lose power above the temperature limit. Protect against heat – high temperature can permanently demagnetize this product. With every degree above norm, the magnet's power temporarily drops. Do not use this product near heat sources exceeding its working range. Exceeding the critical threshold will cause permanent loss of magnetic properties.
*Important note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Thin magnets (pancake types) may lose charge permanently at lower temperatures compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 40x10x18 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 71.96 kg / 158.65 lbs
5 928 Gs
10.79 kg / 23.80 lbs
10794 g / 105.9 N
 N/A
1 mm 62.49 kg / 137.76 lbs
10 068 Gs
9.37 kg / 20.66 lbs
9373 g / 91.9 N
 56.24 kg / 123.98 lbs
~0 Gs
2 mm 53.65 kg / 118.27 lbs
9 328 Gs
8.05 kg / 17.74 lbs
8047 g / 78.9 N
 48.28 kg / 106.44 lbs
~0 Gs
3 mm 45.76 kg / 100.88 lbs
8 615 Gs
6.86 kg / 15.13 lbs
6864 g / 67.3 N
 41.18 kg / 90.79 lbs
~0 Gs
5 mm 32.92 kg / 72.58 lbs
7 308 Gs
4.94 kg / 10.89 lbs
4938 g / 48.4 N
 29.63 kg / 65.32 lbs
~0 Gs
10 mm 14.58 kg / 32.15 lbs
4 864 Gs
2.19 kg / 4.82 lbs
2188 g / 21.5 N
 13.13 kg / 28.94 lbs
~0 Gs
20 mm 3.67 kg / 8.10 lbs
2 441 Gs
0.55 kg / 1.21 lbs
551 g / 5.4 N
 3.30 kg / 7.29 lbs
~0 Gs
50 mm 0.21 kg / 0.46 lbs
585 Gs
0.03 kg / 0.07 lbs
32 g / 0.3 N
 0.19 kg / 0.42 lbs
~0 Gs
60 mm 0.10 kg / 0.22 lbs
406 Gs
0.02 kg / 0.03 lbs
15 g / 0.1 N
 0.09 kg / 0.20 lbs
~0 Gs
70 mm 0.05 kg / 0.12 lbs
293 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
 0.05 kg / 0.10 lbs
~0 Gs
80 mm 0.03 kg / 0.06 lbs
217 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
90 mm 0.02 kg / 0.04 lbs
165 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.03 lbs
~0 Gs
100 mm 0.01 kg / 0.02 lbs
128 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
Two magnets attract each other from a wider radius than a magnet and steel setup. Such a system of magnet-to-magnet produces a massive flux and a further horizon of action. Planning to create a strong closure? Apply two magnets instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the pinch force is massive. The repulsion force is slightly lower than the attraction, but still impressive.
*The magnetic induction in repulsion mode reaches ~0 Gs at the midpoint of the gap (due to field cancellation).
* Figures show friction force of dual same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - warnings
MPL 40x10x18 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.5 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Timepiece 20 Gs (2.0 mT) 8.0 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Remote 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
A strong magnetic field poses a serious hazard to electronics and medical implants. These NdFeB products generate a field that disrupts operation of digital equipment. Be aware: the unseen radiation passes through tissues and glass. Exceptional care must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, car keys, membranes, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MPL 40x10x18 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 15.55 km/h
(4.32 m/s)
 0.50 J
30 mm 16.14 km/h
(4.48 m/s)
 0.54 J
50 mm 16.17 km/h
(4.49 m/s)
 0.54 J
100 mm 16.17 km/h
(4.49 m/s)
 0.54 J
NdFeB products are prone to chipping – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or dangerous crushing to skin. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when handling with large magnets.

Table 9: Coating parameters (durability)
MPL 40x10x18 / 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. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
MPL 40x10x18 / N38

Parameter Value SI Unit / Description
Magnetic Flux 21 285 Mx 212.9 µWb
Pc Coefficient 0.79 High (Stable)
Total magnetic flux passing through the pole surface. Key data when building generators and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 40x10x18 / N38

Environment Effective steel pull Effect
Air (land) 16.72 kg Standard
Water (riverbed) 19.14 kg
(+2.42 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!
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.

1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds just approx. 20-30% of its max power.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Thermal stability

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.79

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 and environmental data

Chemical composition

iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%

Environmental data

recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 020149-2026
Quick Unit Converter

Magnet pull force

Magnetic Field

Input your value in just one field to get results in all other fields at once.

Check out also offers

MPL 40x10x5 / N38 - lamellar magnet
Product on order Ships in 3-5 days

MPL 40x10x5 / N38 - lamellar magnet

6.03 zł brutto / pcs
MW 70x40 / N38 - cylindrical magnet
Product on order Ships in 3-5 days

MW 70x40 / N38 - cylindrical magnet

395.40 zł brutto / pcs
UI 33x13x4 [C311] / N38 - badge holder
Product on order Ships in 3-5 days

UI 33x13x4 [C311] / N38 - badge holder

2.40 zł brutto / pcs
MW 8x15 / N38 - cylindrical magnet
Product on order Ships in 3-5 days

MW 8x15 / N38 - cylindrical magnet

3.44 zł brutto / pcs
This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 40x10x18 mm and a weight of 54 g, guarantees premium class connection. As a magnetic bar with high power (approx. 16.72 kg), this product is available immediately from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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 16.72 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 16.72 kg), they are ideal as closers in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 40x10x18 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. In practice, this means that this magnet has the greatest attraction force on its main planes (40x10 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 40x10x18 mm, which, at a weight of 54 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 16.72 kg (force ~164.01 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • They do not lose power, even during nearly 10 years – the drop in lifting capacity is only ~1% (theoretically),
  • They feature excellent resistance to weakening of magnetic properties as a result of external magnetic sources,
  • A magnet with a metallic silver surface is more attractive,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which allows for strong attraction,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Due to the possibility of flexible shaping and customization to custom needs, neodymium magnets can be manufactured in a broad palette of forms and dimensions, which amplifies use scope,
  • Significant place in future technologies – they are used in data components, brushless drives, medical equipment, and complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited ability of producing threads in the magnet and complicated shapes - preferred is cover - magnet mounting.
  • Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these products can complicate diagnosis medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Pull force analysis

Best holding force of the magnet in ideal parameters – what affects it?

The lifting capacity listed is a result of laboratory testing executed under specific, ideal conditions:
  • with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • whose thickness equals approx. 10 mm
  • characterized by even structure
  • under conditions of no distance (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature room level

Practical aspects of lifting capacity – factors

Effective lifting capacity is influenced by working environment parameters, including (from priority):
  • Air gap (between the magnet and the metal), since even a microscopic clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, rust or debris).
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Material type – the best choice is pure iron steel. Hardened steels may attract less.
  • Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal weaken the grip.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet’s surface and the plate lowers the holding force.

Safe handling of neodymium magnets
Magnetic interference

An intense magnetic field negatively affects the functioning of compasses in smartphones and navigation systems. Do not bring magnets close to a device to avoid breaking the sensors.

Electronic devices

Avoid bringing magnets near a purse, laptop, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Danger to the youngest

Adult use only. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep away from children and animals.

Permanent damage

Regular neodymium magnets (grade N) lose power when the temperature exceeds 80°C. Damage is permanent.

Nickel coating and allergies

A percentage of the population experience a contact allergy to Ni, which is the common plating for neodymium magnets. Prolonged contact might lead to an allergic reaction. We recommend wear safety gloves.

Combustion hazard

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

Crushing force

Large magnets can crush fingers in a fraction of a second. Never place your hand between two strong magnets.

ICD Warning

Life threat: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Protective goggles

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Collision of two magnets will cause them breaking into shards.

Caution required

Be careful. Neodymium magnets act from a long distance and snap with massive power, often quicker than you can move away.

Danger! Looking for details? Check our post: Why are neodymium magnets dangerous?