Powerful neodymium magnets: discs and cylinders

Looking for huge power in small size? We have in stock complete range of various shapes and sizes. Best choice for domestic applications, garage and model making. Check our offer in stock.

see price list and dimensions

Magnet fishing sets (hobbyists)

Start your adventure related to seabed exploration! Our specialized grips (F200, F400) provide grip certainty and huge lifting capacity. Stainless steel construction and strong lines will perform in any water.

choose your set

Magnetic mounting systems

Proven solutions for fixing non-invasive. Threaded grips (external or internal) guarantee instant organization of work on production halls. Perfect for installing lighting, sensors and ads.

see available threads

🚀 Express processing: orders by 14:00 shipped within 24h!

Dhit sp. z o.o.
Product on order Ships in 3-5 days

MPL 40x10x18 / N38 - lamellar magnet

lamellar magnet

Catalog no 020149

GTIN/EAN: 5906301811558

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

18.45 with VAT / pcs + price for transport

15.00 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

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
Can't decide what to choose?

Call us +48 22 499 98 98 or drop us a message via inquiry form the contact section.
Specifications along with structure of neodymium magnets can be verified using our magnetic mass calculator.

Order by 14:00 and we’ll ship today!

Physical properties - 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
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 - technical parameters

Presented values constitute the result of a mathematical calculation. Results rely on models for the material Nd2Fe14B. Real-world performance may differ from theoretical values. Please consider these calculations as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - characteristics
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
crushing
1 mm 4664 Gs
466.4 mT
12.46 kg / 27.48 LBS
12464.6 g / 122.3 N
crushing
2 mm 3970 Gs
397.0 mT
9.03 kg / 19.90 LBS
9028.7 g / 88.6 N
warning
3 mm 3362 Gs
336.2 mT
6.48 kg / 14.28 LBS
6476.4 g / 63.5 N
warning
5 mm 2432 Gs
243.2 mT
3.39 kg / 7.47 LBS
3388.5 g / 33.2 N
warning
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

Table 2: Slippage force (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

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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

Table 4: Material efficiency (saturation) - 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

Table 5: Thermal stability (material behavior) - resistance threshold
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

Table 6: Two magnets (attraction) - forces in the system
MPL 40x10x18 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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

Table 7: Safety (HSE) (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
Car key 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

Table 8: Dynamics (kinetic energy) - warning
MPL 40x10x18 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.30 km/h
(5.08 m/s)
0.70 J
30 mm 30.76 km/h
(8.55 m/s)
1.97 J
50 mm 39.69 km/h
(11.02 m/s)
3.28 J
100 mm 56.12 km/h
(15.59 m/s)
6.56 J

Table 9: Anti-corrosion coating 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)

Table 10: Electrical data (Flux)
MPL 40x10x18 / N38

Parameter Value SI Unit / Description
Magnetic Flux 21 285 Mx 212.9 µWb
Pc Coefficient 0.79 High (Stable)

Table 11: Hydrostatics and buoyancy
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds only ~20% of its max power.

2. Steel thickness impact

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

3. Thermal stability

*For standard magnets, 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.

Engineering data and GPSR
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%
Sustainability
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
Measurement Calculator
Magnet pull force

Magnetic Induction

Check out also products

This product is a very powerful 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. This magnetic block with a force of 164.01 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.
The key to success is sliding the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 40x10x18 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
They constitute a key element in the production of generators and material handling systems. Thanks to the flat surface and high force (approx. 16.72 kg), they are ideal as hidden locks 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, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to clean and degrease 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 holding force amounting to approximately 16.72 kg (force ~164.01 N), which, with such a flat shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Pros and cons of Nd2Fe14B magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:
  • They retain magnetic properties for almost 10 years – the drop is just ~1% (according to analyses),
  • They are extremely resistant to demagnetization induced by external disturbances,
  • In other words, due to the glossy surface of silver, the element gains a professional look,
  • Neodymium magnets ensure maximum magnetic induction on a small area, which allows for strong attraction,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of detailed machining as well as modifying to precise conditions,
  • Fundamental importance in modern technologies – they find application in mass storage devices, electromotive mechanisms, medical equipment, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in miniature devices

Cons

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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 immune to moisture, when using outdoors
  • Limited ability of creating nuts in the magnet and complex shapes - preferred is a housing - magnet mounting.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Lifting parameters

Breakaway strength of the magnet in ideal conditionswhat affects it?

Magnet power was defined for optimal configuration, assuming:
  • on a block made of structural steel, perfectly concentrating the magnetic field
  • possessing a thickness of at least 10 mm to avoid saturation
  • with a plane perfectly flat
  • under conditions of ideal adhesion (metal-to-metal)
  • during detachment in a direction perpendicular to the plane
  • in stable room temperature

Practical aspects of lifting capacity – factors

Please note that the application force may be lower influenced by the following factors, in order of importance:
  • Distance – the presence of any layer (paint, tape, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Plate thickness – too thin steel does not accept the full field, causing part of the power to be lost into the air.
  • Steel type – mild steel gives the best results. Alloy steels reduce magnetic properties and holding force.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with NdFeB magnets
Flammability

Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Electronic hazard

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

Power loss in heat

Do not overheat. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, look for special high-temperature series (H, SH, UH).

Impact on smartphones

Note: neodymium magnets produce a field that interferes with precision electronics. Maintain a safe distance from your mobile, tablet, and GPS.

Product not for children

NdFeB magnets are not intended for children. Eating a few magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates immediate surgery.

Magnets are brittle

Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Avoid contact if allergic

It is widely known that nickel (standard magnet coating) is a strong allergen. For allergy sufferers, refrain from direct skin contact and choose encased magnets.

Conscious usage

Before starting, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Crushing risk

Big blocks can crush fingers instantly. Do not put your hand between two attracting surfaces.

Pacemakers

Individuals with a ICD must maintain an absolute distance from magnets. The magnetic field can disrupt the operation of the implant.

Warning! Learn more about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98