Strong neodymium magnets: discs and cylinders

Need reliable magnetic field? We have in stock wide selection of disc, cylindrical and ring magnets. They are ideal for domestic applications, garage and industrial tasks. Check our offer available immediately.

check magnet catalog

Equipment for treasure hunters

Discover your passion with treasure salvaging! Our specialized grips (F200, F400) provide safety guarantee and huge lifting capacity. Stainless steel construction and strong lines will perform in challenging water conditions.

choose your water magnet

Reliable threaded grips

Proven solutions for mounting non-invasive. Threaded mounts (external or internal) guarantee instant organization of work on production halls. They are indispensable mounting lighting, sensors and ads.

see technical specs

📦 Fast shipping: buy by 14:00, we'll ship today!

Dhit sp. z o.o.
Product available Ships today (order by 14:00)

MPL 42x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020163

GTIN/EAN: 5906301811695

5.00

length

42 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

31.5 g

Magnetization Direction

↑ axial

Load capacity

11.06 kg / 108.46 N

Magnetic Induction

203.37 mT / 2034 Gs

Coating

[NiCuNi] Nickel

15.62 with VAT / pcs + price for transport

12.70 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
12.70 ZŁ
15.62 ZŁ
price from 50 pcs
11.94 ZŁ
14.68 ZŁ
price from 200 pcs
11.18 ZŁ
13.75 ZŁ
Looking for a better price?

Call us +48 22 499 98 98 otherwise drop us a message by means of request form the contact page.
Weight along with form of a neodymium magnet can be tested on our magnetic calculator.

Same-day processing for orders placed before 14:00.

Technical of the product - MPL 42x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 42x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020163
GTIN/EAN 5906301811695
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 42 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 31.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 11.06 kg / 108.46 N
Magnetic Induction ~ ? 203.37 mT / 2034 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 42x20x5 / 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 simulation of the product - technical parameters

These information are the outcome of a physical simulation. Results rely on models for the material Nd2Fe14B. Real-world performance may differ. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs gap) - characteristics
MPL 42x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2033 Gs
203.3 mT
11.06 kg / 24.38 pounds
11060.0 g / 108.5 N
critical level
1 mm 1938 Gs
193.8 mT
10.05 kg / 22.15 pounds
10049.3 g / 98.6 N
critical level
2 mm 1823 Gs
182.3 mT
8.89 kg / 19.60 pounds
8888.2 g / 87.2 N
strong
3 mm 1696 Gs
169.6 mT
7.69 kg / 16.96 pounds
7691.7 g / 75.5 N
strong
5 mm 1433 Gs
143.3 mT
5.49 kg / 12.10 pounds
5490.3 g / 53.9 N
strong
10 mm 885 Gs
88.5 mT
2.09 kg / 4.62 pounds
2093.5 g / 20.5 N
strong
15 mm 547 Gs
54.7 mT
0.80 kg / 1.76 pounds
799.6 g / 7.8 N
weak grip
20 mm 350 Gs
35.0 mT
0.33 kg / 0.72 pounds
327.0 g / 3.2 N
weak grip
30 mm 160 Gs
16.0 mT
0.07 kg / 0.15 pounds
68.5 g / 0.7 N
weak grip
50 mm 48 Gs
4.8 mT
0.01 kg / 0.01 pounds
6.2 g / 0.1 N
weak grip

Table 2: Sliding capacity (wall)
MPL 42x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.21 kg / 4.88 pounds
2212.0 g / 21.7 N
1 mm Stal (~0.2) 2.01 kg / 4.43 pounds
2010.0 g / 19.7 N
2 mm Stal (~0.2) 1.78 kg / 3.92 pounds
1778.0 g / 17.4 N
3 mm Stal (~0.2) 1.54 kg / 3.39 pounds
1538.0 g / 15.1 N
5 mm Stal (~0.2) 1.10 kg / 2.42 pounds
1098.0 g / 10.8 N
10 mm Stal (~0.2) 0.42 kg / 0.92 pounds
418.0 g / 4.1 N
15 mm Stal (~0.2) 0.16 kg / 0.35 pounds
160.0 g / 1.6 N
20 mm Stal (~0.2) 0.07 kg / 0.15 pounds
66.0 g / 0.6 N
30 mm Stal (~0.2) 0.01 kg / 0.03 pounds
14.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 42x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.32 kg / 7.31 pounds
3318.0 g / 32.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.21 kg / 4.88 pounds
2212.0 g / 21.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.11 kg / 2.44 pounds
1106.0 g / 10.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.53 kg / 12.19 pounds
5530.0 g / 54.2 N

Table 4: Steel thickness (substrate influence) - power losses
MPL 42x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.55 kg / 1.22 pounds
553.0 g / 5.4 N
1 mm
13%
1.38 kg / 3.05 pounds
1382.5 g / 13.6 N
2 mm
25%
2.77 kg / 6.10 pounds
2765.0 g / 27.1 N
3 mm
38%
4.15 kg / 9.14 pounds
4147.5 g / 40.7 N
5 mm
63%
6.91 kg / 15.24 pounds
6912.5 g / 67.8 N
10 mm
100%
11.06 kg / 24.38 pounds
11060.0 g / 108.5 N
11 mm
100%
11.06 kg / 24.38 pounds
11060.0 g / 108.5 N
12 mm
100%
11.06 kg / 24.38 pounds
11060.0 g / 108.5 N

Table 5: Thermal resistance (material behavior) - resistance threshold
MPL 42x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.06 kg / 24.38 pounds
11060.0 g / 108.5 N
OK
40 °C -2.2% 10.82 kg / 23.85 pounds
10816.7 g / 106.1 N
OK
60 °C -4.4% 10.57 kg / 23.31 pounds
10573.4 g / 103.7 N
80 °C -6.6% 10.33 kg / 22.77 pounds
10330.0 g / 101.3 N
100 °C -28.8% 7.87 kg / 17.36 pounds
7874.7 g / 77.3 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 42x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 21.41 kg / 47.21 pounds
3 465 Gs
3.21 kg / 7.08 pounds
3212 g / 31.5 N
N/A
1 mm 20.49 kg / 45.17 pounds
3 978 Gs
3.07 kg / 6.78 pounds
3074 g / 30.2 N
18.44 kg / 40.66 pounds
~0 Gs
2 mm 19.46 kg / 42.89 pounds
3 877 Gs
2.92 kg / 6.43 pounds
2918 g / 28.6 N
17.51 kg / 38.60 pounds
~0 Gs
3 mm 18.35 kg / 40.46 pounds
3 765 Gs
2.75 kg / 6.07 pounds
2753 g / 27.0 N
16.52 kg / 36.41 pounds
~0 Gs
5 mm 16.05 kg / 35.38 pounds
3 521 Gs
2.41 kg / 5.31 pounds
2407 g / 23.6 N
14.44 kg / 31.84 pounds
~0 Gs
10 mm 10.63 kg / 23.43 pounds
2 865 Gs
1.59 kg / 3.52 pounds
1594 g / 15.6 N
9.57 kg / 21.09 pounds
~0 Gs
20 mm 4.05 kg / 8.94 pounds
1 769 Gs
0.61 kg / 1.34 pounds
608 g / 6.0 N
3.65 kg / 8.04 pounds
~0 Gs
50 mm 0.28 kg / 0.62 pounds
465 Gs
0.04 kg / 0.09 pounds
42 g / 0.4 N
0.25 kg / 0.55 pounds
~0 Gs
60 mm 0.13 kg / 0.29 pounds
320 Gs
0.02 kg / 0.04 pounds
20 g / 0.2 N
0.12 kg / 0.26 pounds
~0 Gs
70 mm 0.07 kg / 0.15 pounds
228 Gs
0.01 kg / 0.02 pounds
10 g / 0.1 N
0.06 kg / 0.13 pounds
~0 Gs
80 mm 0.04 kg / 0.08 pounds
167 Gs
0.01 kg / 0.01 pounds
5 g / 0.1 N
0.03 kg / 0.07 pounds
~0 Gs
90 mm 0.02 kg / 0.04 pounds
125 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
0.02 kg / 0.04 pounds
~0 Gs
100 mm 0.01 kg / 0.03 pounds
96 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
0.01 kg / 0.02 pounds
~0 Gs

Table 7: Safety (HSE) (electronics) - warnings
MPL 42x20x5 / 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
Mechanical watch 20 Gs (2.0 mT) 7.0 cm
Mobile device 40 Gs (4.0 mT) 5.5 cm
Car key 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

Table 8: Dynamics (cracking risk) - collision effects
MPL 42x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.01 km/h
(5.84 m/s)
0.54 J
30 mm 32.86 km/h
(9.13 m/s)
1.31 J
50 mm 42.27 km/h
(11.74 m/s)
2.17 J
100 mm 59.76 km/h
(16.60 m/s)
4.34 J

Table 9: Corrosion resistance
MPL 42x20x5 / 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 (Pc)
MPL 42x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 18 614 Mx 186.1 µWb
Pc Coefficient 0.23 Low (Flat)

Table 11: Underwater work (magnet fishing)
MPL 42x20x5 / N38

Environment Effective steel pull Effect
Air (land) 11.06 kg Standard
Water (riverbed) 12.66 kg
(+1.60 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Shear force

*Note: On a vertical surface, the magnet holds only ~20% of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) significantly weakens 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) = 0.23

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
Material specification
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: 020163-2026
Magnet Unit Converter
Pulling force

Magnetic Field

Other deals

This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 42x20x5 mm and a weight of 31.5 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 11.06 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 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 42x20x5 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 42x20x5 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 11.06 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 42x20x5 / 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. 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 (42x20 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: 42 mm (length), 20 mm (width), and 5 mm (thickness). It is a magnetic block with dimensions 42x20x5 mm and a self-weight of 31.5 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of rare earth magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose magnetism, even over around ten years – the drop in strength is only ~1% (based on measurements),
  • Neodymium magnets prove to be remarkably resistant to magnetic field loss caused by external field sources,
  • By covering with a decorative coating of nickel, the element acquires an elegant look,
  • Neodymium magnets ensure maximum magnetic induction on a contact point, which allows for strong attraction,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Considering the ability of precise shaping and customization to unique solutions, NdFeB magnets can be manufactured in a broad palette of geometric configurations, which expands the range of possible applications,
  • Universal use in modern technologies – they find application in mass storage devices, electric motors, medical equipment, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in small systems

Disadvantages

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of producing threads in the magnet and complex forms - recommended is casing - mounting mechanism.
  • Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these products can complicate diagnosis medical after entering the body.
  • Due to expensive raw materials, their price is higher than average,

Lifting parameters

Detachment force of the magnet in optimal conditionswhat contributes to it?

Breakaway force is the result of a measurement for optimal configuration, taking into account:
  • with the application of a sheet made of special test steel, guaranteeing maximum field concentration
  • with a thickness of at least 10 mm
  • characterized by even structure
  • without the slightest clearance between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at standard ambient temperature

Lifting capacity in practice – influencing factors

Holding efficiency is influenced by working environment parameters, such as (from priority):
  • Distance – the presence of foreign body (paint, tape, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Direction of force – highest force is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material composition – different alloys reacts the same. High carbon content weaken the attraction effect.
  • Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity was assessed with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, whereas under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Warnings
Bodily injuries

Pinching hazard: The attraction force is so immense that it can cause blood blisters, pinching, and broken bones. Protective gloves are recommended.

Implant safety

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

Danger to the youngest

These products are not suitable for play. Swallowing multiple magnets may result in them attracting across intestines, which poses a severe health hazard and necessitates urgent medical intervention.

Safe operation

Use magnets consciously. Their immense force can shock even professionals. Stay alert and do not underestimate their power.

Maximum temperature

Monitor thermal conditions. Exposing the magnet to high heat will ruin its magnetic structure and strength.

Do not drill into magnets

Machining of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Data carriers

Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

GPS and phone interference

A powerful magnetic field disrupts the operation of compasses in phones and navigation systems. Keep magnets near a device to avoid breaking the sensors.

Magnet fragility

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Warning for allergy sufferers

Certain individuals have a hypersensitivity to Ni, which is the common plating for neodymium magnets. Frequent touching can result in an allergic reaction. We strongly advise use safety gloves.

Danger! Looking for details? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98