Strong neodymium magnets: discs and cylinders

Need reliable magnetic field? We have in stock rich assortment of various shapes and sizes. Best choice for home use, workshop and industrial tasks. Check our offer in stock.

check price list and dimensions

Equipment for treasure hunters

Begin your hobby related to seabed exploration! Our double-handle grips (F200, F400) provide grip certainty and huge lifting capacity. Stainless steel construction and reinforced ropes are reliable in challenging water conditions.

choose searching equipment

Magnetic mounts for industry

Reliable solutions for fixing non-invasive. Threaded mounts (external or internal) provide quick improvement of work on warehouses. They are indispensable installing lamps, detectors and ads.

see technical specs

🚚 Order by 14:00 – we'll ship today!

Dhit sp. z o.o.
Product available Ships tomorrow

MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

lamellar magnet

Catalog no 020397

GTIN/EAN: 5906301811909

5.00

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

15 g

Magnetization Direction

↑ axial

Load capacity

11.85 kg / 116.27 N

Magnetic Induction

321.37 mT / 3214 Gs

Coating

[NiCuNi] Nickel

9.93 with VAT / pcs + price for transport

8.07 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
8.07 ZŁ
9.93 ZŁ
price from 100 pcs
7.59 ZŁ
9.33 ZŁ
price from 350 pcs
7.10 ZŁ
8.73 ZŁ
Want to negotiate?

Call us +48 22 499 98 98 otherwise get in touch via inquiry form the contact page.
Weight as well as form of magnetic components can be checked on our modular calculator.

Orders placed before 14:00 will be shipped the same business day.

Technical parameters of the product - MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

properties
properties values
Cat. no. 020397
GTIN/EAN 5906301811909
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 5 mm [±0,1 mm]
Weight 15 g
Magnetization Direction ↑ axial
Load capacity ~ ? 11.85 kg / 116.27 N
Magnetic Induction ~ ? 321.37 mT / 3214 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x5x2[7/3.5] / 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

Engineering simulation of the magnet - data

Presented information are the result of a mathematical analysis. Values were calculated on models for the class Nd2Fe14B. Actual conditions may differ from theoretical values. Please consider these data as a supplementary guide when designing systems.

Table 1: Static force (force vs distance) - interaction chart
MPL 40x10x5x2[7/3.5] / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3212 Gs
321.2 mT
11.85 kg / 26.12 LBS
11850.0 g / 116.2 N
critical level
1 mm 2791 Gs
279.1 mT
8.95 kg / 19.73 LBS
8947.7 g / 87.8 N
warning
2 mm 2358 Gs
235.8 mT
6.38 kg / 14.08 LBS
6384.9 g / 62.6 N
warning
3 mm 1965 Gs
196.5 mT
4.43 kg / 9.77 LBS
4432.4 g / 43.5 N
warning
5 mm 1360 Gs
136.0 mT
2.12 kg / 4.68 LBS
2122.9 g / 20.8 N
warning
10 mm 615 Gs
61.5 mT
0.43 kg / 0.96 LBS
434.1 g / 4.3 N
safe
15 mm 329 Gs
32.9 mT
0.12 kg / 0.27 LBS
124.5 g / 1.2 N
safe
20 mm 195 Gs
19.5 mT
0.04 kg / 0.10 LBS
43.9 g / 0.4 N
safe
30 mm 83 Gs
8.3 mT
0.01 kg / 0.02 LBS
8.0 g / 0.1 N
safe
50 mm 24 Gs
2.4 mT
0.00 kg / 0.00 LBS
0.6 g / 0.0 N
safe

Table 2: Vertical load (wall)
MPL 40x10x5x2[7/3.5] / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.37 kg / 5.22 LBS
2370.0 g / 23.2 N
1 mm Stal (~0.2) 1.79 kg / 3.95 LBS
1790.0 g / 17.6 N
2 mm Stal (~0.2) 1.28 kg / 2.81 LBS
1276.0 g / 12.5 N
3 mm Stal (~0.2) 0.89 kg / 1.95 LBS
886.0 g / 8.7 N
5 mm Stal (~0.2) 0.42 kg / 0.93 LBS
424.0 g / 4.2 N
10 mm Stal (~0.2) 0.09 kg / 0.19 LBS
86.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 LBS
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 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 40x10x5x2[7/3.5] / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.55 kg / 7.84 LBS
3555.0 g / 34.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.37 kg / 5.22 LBS
2370.0 g / 23.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.19 kg / 2.61 LBS
1185.0 g / 11.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.93 kg / 13.06 LBS
5925.0 g / 58.1 N

Table 4: Material efficiency (substrate influence) - power losses
MPL 40x10x5x2[7/3.5] / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.59 kg / 1.31 LBS
592.5 g / 5.8 N
1 mm
13%
1.48 kg / 3.27 LBS
1481.3 g / 14.5 N
2 mm
25%
2.96 kg / 6.53 LBS
2962.5 g / 29.1 N
3 mm
38%
4.44 kg / 9.80 LBS
4443.8 g / 43.6 N
5 mm
63%
7.41 kg / 16.33 LBS
7406.3 g / 72.7 N
10 mm
100%
11.85 kg / 26.12 LBS
11850.0 g / 116.2 N
11 mm
100%
11.85 kg / 26.12 LBS
11850.0 g / 116.2 N
12 mm
100%
11.85 kg / 26.12 LBS
11850.0 g / 116.2 N

Table 5: Thermal stability (material behavior) - resistance threshold
MPL 40x10x5x2[7/3.5] / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.85 kg / 26.12 LBS
11850.0 g / 116.2 N
OK
40 °C -2.2% 11.59 kg / 25.55 LBS
11589.3 g / 113.7 N
OK
60 °C -4.4% 11.33 kg / 24.98 LBS
11328.6 g / 111.1 N
80 °C -6.6% 11.07 kg / 24.40 LBS
11067.9 g / 108.6 N
100 °C -28.8% 8.44 kg / 18.60 LBS
8437.2 g / 82.8 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 40x10x5x2[7/3.5] / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 25.44 kg / 56.10 LBS
4 569 Gs
3.82 kg / 8.41 LBS
3817 g / 37.4 N
N/A
1 mm 22.33 kg / 49.22 LBS
6 018 Gs
3.35 kg / 7.38 LBS
3349 g / 32.9 N
20.09 kg / 44.30 LBS
~0 Gs
2 mm 19.21 kg / 42.36 LBS
5 582 Gs
2.88 kg / 6.35 LBS
2882 g / 28.3 N
17.29 kg / 38.12 LBS
~0 Gs
3 mm 16.31 kg / 35.96 LBS
5 144 Gs
2.45 kg / 5.39 LBS
2447 g / 24.0 N
14.68 kg / 32.36 LBS
~0 Gs
5 mm 11.45 kg / 25.23 LBS
4 309 Gs
1.72 kg / 3.78 LBS
1717 g / 16.8 N
10.30 kg / 22.71 LBS
~0 Gs
10 mm 4.56 kg / 10.05 LBS
2 719 Gs
0.68 kg / 1.51 LBS
684 g / 6.7 N
4.10 kg / 9.04 LBS
~0 Gs
20 mm 0.93 kg / 2.05 LBS
1 230 Gs
0.14 kg / 0.31 LBS
140 g / 1.4 N
0.84 kg / 1.85 LBS
~0 Gs
50 mm 0.04 kg / 0.08 LBS
249 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
0.03 kg / 0.08 LBS
~0 Gs
60 mm 0.02 kg / 0.04 LBS
167 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
0.02 kg / 0.03 LBS
~0 Gs
70 mm 0.01 kg / 0.02 LBS
116 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.01 LBS
84 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.01 LBS
62 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
48 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Protective zones (implants) - precautionary measures
MPL 40x10x5x2[7/3.5] / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.0 cm
Hearing aid 10 Gs (1.0 mT) 7.0 cm
Timepiece 20 Gs (2.0 mT) 5.5 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Remote 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Dynamics (cracking risk) - collision effects
MPL 40x10x5x2[7/3.5] / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.99 km/h
(8.05 m/s)
0.49 J
30 mm 49.12 km/h
(13.64 m/s)
1.40 J
50 mm 63.39 km/h
(17.61 m/s)
2.33 J
100 mm 89.64 km/h
(24.90 m/s)
4.65 J

Table 9: Coating parameters (durability)
MPL 40x10x5x2[7/3.5] / 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)

Table 10: Electrical data (Flux)
MPL 40x10x5x2[7/3.5] / N38

Parameter Value SI Unit / Description
Magnetic Flux 11 419 Mx 114.2 µWb
Pc Coefficient 0.31 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 40x10x5x2[7/3.5] / N38

Environment Effective steel pull Effect
Air (land) 11.85 kg Standard
Water (riverbed) 13.57 kg
(+1.72 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Vertical hold

*Note: On a vertical surface, the magnet retains only a fraction of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. computer case) significantly limits the holding force.

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.31

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: 020397-2026
Quick Unit Converter
Magnet pull force

Magnetic Induction

Other deals

Model MPL 40x10x5x2[7/3.5] / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 11.85 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is shifting 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. Watch your fingers! Magnets with a force of 11.85 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.
Plate magnets MPL 40x10x5x2[7/3.5] / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as invisible mounts under tiles, wood, or glass. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 40x10x5x2[7/3.5] / N38, it is best to use strong epoxy glues (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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
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.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 10 mm (width), and 5 mm (thickness). The key parameter here is the holding force amounting to approximately 11.85 kg (force ~116.27 N), which, with such a compact shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of Nd2Fe14B magnets.

Advantages

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
  • Neodymium magnets prove to be highly resistant to demagnetization caused by external magnetic fields,
  • Thanks to the elegant finish, the layer of Ni-Cu-Ni, gold-plated, or silver-plated gives an clean appearance,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
  • Considering the possibility of precise shaping and customization to specialized projects, NdFeB magnets can be created in a broad palette of geometric configurations, which amplifies use scope,
  • Significant place in innovative solutions – they are used in mass storage devices, electric drive systems, medical devices, and technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • Neodymium magnets lose their strength 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 durability 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 immune to moisture, when using outdoors
  • Limited ability of making threads in the magnet and complicated forms - preferred is casing - mounting mechanism.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these products are able to complicate diagnosis medical after entering the body.
  • Due to complex production process, their price is higher than average,

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat affects it?

The specified lifting capacity represents the maximum value, recorded under optimal environment, meaning:
  • using a base made of mild steel, serving as a circuit closing element
  • with a cross-section no less than 10 mm
  • with an ground contact surface
  • without the slightest clearance between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • at temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Holding efficiency is affected by specific conditions, mainly (from most important):
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

Safety rules for work with neodymium magnets
Protect data

Avoid bringing magnets near a purse, computer, or TV. The magnetism can destroy these devices and wipe information from cards.

Allergic reactions

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If redness appears, cease working with magnets and use protective gear.

Powerful field

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Shattering risk

Protect your eyes. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Physical harm

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, destroying anything in their path. Be careful!

GPS and phone interference

An intense magnetic field interferes with the operation of magnetometers in phones and GPS navigation. Do not bring magnets close to a device to avoid damaging the sensors.

Medical implants

Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Dust explosion hazard

Fire hazard: Neodymium dust is explosive. Avoid machining magnets without safety gear as this risks ignition.

Keep away from children

Absolutely store magnets away from children. Choking hazard is high, and the consequences of magnets clamping inside the body are fatal.

Thermal limits

Keep cool. NdFeB magnets are susceptible to heat. If you require operation above 80°C, look for HT versions (H, SH, UH).

Security! Want to know more? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98