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MPL 30x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020142

GTIN/EAN: 5906301811480

5.00

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

90 g

Magnetization Direction

↑ axial

Load capacity

24.27 kg / 238.07 N

Magnetic Induction

512.53 mT / 5125 Gs

Coating

[NiCuNi] Nickel

view specifications »

43.22 ZŁ with VAT / pcs + price for transport

35.14 ZŁ net + 23% VAT / pcs

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Technical details - MPL 30x20x20 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x20 / N38 - lamellar magnet

properties
properties values
Cat. no. 020142
GTIN/EAN 5906301811480
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 30 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 90 g
Magnetization Direction ↑ axial
Load capacity ~ ? 24.27 kg / 238.07 N
Magnetic Induction ~ ? 512.53 mT / 5125 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x20 / 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

Physical analysis of the assembly - report

The following values represent the outcome of a engineering simulation. Values rely on models for the class Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Use these data as a reference point when designing systems.

Table 1: Static pull force (pull vs gap) - power drop
MPL 30x20x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5124 Gs
512.4 mT
 24.27 kg / 53.51 pounds
24270.0 g / 238.1 N
 dangerous!
1 mm 4730 Gs
473.0 mT
 20.68 kg / 45.60 pounds
20685.0 g / 202.9 N
 dangerous!
2 mm 4335 Gs
433.5 mT
 17.37 kg / 38.30 pounds
17370.7 g / 170.4 N
 dangerous!
3 mm 3950 Gs
395.0 mT
 14.43 kg / 31.80 pounds
14425.2 g / 141.5 N
 dangerous!
5 mm 3240 Gs
324.0 mT
 9.71 kg / 21.40 pounds
9706.2 g / 95.2 N
 strong
10 mm 1923 Gs
192.3 mT
 3.42 kg / 7.53 pounds
3417.4 g / 33.5 N
 strong
15 mm 1163 Gs
116.3 mT
 1.25 kg / 2.76 pounds
1250.2 g / 12.3 N
 safe
20 mm 736 Gs
73.6 mT
 0.50 kg / 1.10 pounds
500.4 g / 4.9 N
 safe
30 mm 338 Gs
33.8 mT
 0.11 kg / 0.23 pounds
105.3 g / 1.0 N
 safe
50 mm 106 Gs
10.6 mT
 0.01 kg / 0.02 pounds
10.3 g / 0.1 N
 safe
Pulling power decreases sharply with every mm of spacing. Remember that even a microscopic distance (e.g., contamination, varnish, dust) significantly reduces the pull force. Magnetic products work strongest during direct contact; air break nullifies the force. Observe how rapidly the pull force fall, when the product does not adhere directly to the steel surface. When planning the mounting, discard additional spacers.

Table 2: Sliding load (vertical surface)
MPL 30x20x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.85 kg / 10.70 pounds
4854.0 g / 47.6 N
1 mm Stal (~0.2) 4.14 kg / 9.12 pounds
4136.0 g / 40.6 N
2 mm Stal (~0.2) 3.47 kg / 7.66 pounds
3474.0 g / 34.1 N
3 mm Stal (~0.2) 2.89 kg / 6.36 pounds
2886.0 g / 28.3 N
5 mm Stal (~0.2) 1.94 kg / 4.28 pounds
1942.0 g / 19.1 N
10 mm Stal (~0.2) 0.68 kg / 1.51 pounds
684.0 g / 6.7 N
15 mm Stal (~0.2) 0.25 kg / 0.55 pounds
250.0 g / 2.5 N
20 mm Stal (~0.2) 0.10 kg / 0.22 pounds
100.0 g / 1.0 N
30 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
This section indicates the approximate force sufficient to cause the downward movement of the magnet downwards on a upright metal surface (assuming typical friction). This parameter depends on the distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 30x20x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
7.28 kg / 16.05 pounds
7281.0 g / 71.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.85 kg / 10.70 pounds
4854.0 g / 47.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.43 kg / 5.35 pounds
2427.0 g / 23.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
12.14 kg / 26.75 pounds
12135.0 g / 119.0 N
When placing a element on a vertical plane (e.g., a board), it will maintain barely approx. 20%-30% of its nominal power. Gravity and a low friction coefficient influence the fact that holders slide down easier than they detach. Planning a hanger? Consider that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the holder will slip down under a noticeably lighter weight. Application of an anti-slip layer can effectively raise the stability.

Table 4: Steel thickness (saturation) - power losses
MPL 30x20x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.21 kg / 2.68 pounds
1213.5 g / 11.9 N
1 mm
13%
 3.03 kg / 6.69 pounds
3033.8 g / 29.8 N
2 mm
25%
 6.07 kg / 13.38 pounds
6067.5 g / 59.5 N
3 mm
38%
 9.10 kg / 20.06 pounds
9101.3 g / 89.3 N
5 mm
63%
 15.17 kg / 33.44 pounds
15168.8 g / 148.8 N
10 mm
100%
 24.27 kg / 53.51 pounds
24270.0 g / 238.1 N
11 mm
100%
 24.27 kg / 53.51 pounds
24270.0 g / 238.1 N
12 mm
100%
 24.27 kg / 53.51 pounds
24270.0 g / 238.1 N
A thin metal plate cannot take in the entire magnetic field, which wastes potential of the magnet. Should you install a neodymium to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To achieve full efficiency of this magnet's power, you need a suitably thick element of metal. The saturation effect means that on sheet metal structures (e.g., car bodies), the product works worse. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal stability (material behavior) - power drop
MPL 30x20x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 24.27 kg / 53.51 pounds
24270.0 g / 238.1 N
 OK
40 °C -2.2% 23.74 kg / 52.33 pounds
23736.1 g / 232.9 N
 OK
60 °C -4.4% 23.20 kg / 51.15 pounds
23202.1 g / 227.6 N
 OK
80 °C -6.6% 22.67 kg / 49.97 pounds
22668.2 g / 222.4 N
100 °C -28.8% 17.28 kg / 38.10 pounds
17280.2 g / 169.5 N
Classic neodymiums change their properties parameters above the temperature limit. Protect against heat – excessive heat can permanently demagnetize this product. With every degree above norm, the neodymium's capacity momentarily drops. Do not use this product near heat sources exceeding its operating temperature limit. Too high temperature will result in permanent loss of magnetism.
*Important note: Temperature resistance is determined by both grade, as well as the dimension ratios. Flat magnets (low Pc) risk losing magnetic properties at lower temperatures than taller cylinders. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
MPL 30x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 97.11 kg / 214.09 pounds
5 859 Gs
14.57 kg / 32.11 pounds
14567 g / 142.9 N
 N/A
1 mm 89.88 kg / 198.15 pounds
9 859 Gs
13.48 kg / 29.72 pounds
13482 g / 132.3 N
 80.89 kg / 178.34 pounds
~0 Gs
2 mm 82.77 kg / 182.47 pounds
9 461 Gs
12.42 kg / 27.37 pounds
12415 g / 121.8 N
 74.49 kg / 164.22 pounds
~0 Gs
3 mm 75.96 kg / 167.47 pounds
9 063 Gs
11.39 kg / 25.12 pounds
11394 g / 111.8 N
 68.37 kg / 150.72 pounds
~0 Gs
5 mm 63.42 kg / 139.81 pounds
8 281 Gs
9.51 kg / 20.97 pounds
9513 g / 93.3 N
 57.08 kg / 125.83 pounds
~0 Gs
10 mm 38.84 kg / 85.62 pounds
6 481 Gs
5.83 kg / 12.84 pounds
5826 g / 57.1 N
 34.95 kg / 77.06 pounds
~0 Gs
20 mm 13.67 kg / 30.15 pounds
3 845 Gs
2.05 kg / 4.52 pounds
2051 g / 20.1 N
 12.31 kg / 27.13 pounds
~0 Gs
50 mm 0.88 kg / 1.94 pounds
976 Gs
0.13 kg / 0.29 pounds
132 g / 1.3 N
 0.79 kg / 1.75 pounds
~0 Gs
60 mm 0.42 kg / 0.93 pounds
675 Gs
0.06 kg / 0.14 pounds
63 g / 0.6 N
 0.38 kg / 0.84 pounds
~0 Gs
70 mm 0.22 kg / 0.48 pounds
484 Gs
0.03 kg / 0.07 pounds
33 g / 0.3 N
 0.20 kg / 0.43 pounds
~0 Gs
80 mm 0.12 kg / 0.26 pounds
358 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
 0.11 kg / 0.24 pounds
~0 Gs
90 mm 0.07 kg / 0.15 pounds
272 Gs
0.01 kg / 0.02 pounds
10 g / 0.1 N
 0.06 kg / 0.14 pounds
~0 Gs
100 mm 0.04 kg / 0.09 pounds
211 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.04 kg / 0.08 pounds
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a neodymium and metal combination. The connection of magnet-to-magnet generates a stronger field and a further horizon of operation. Planning to create a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is huge. The repulsion force is a bit weaker than the connection force, but still significant.
*Flux density in repulsion mode is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Note: Estimates demonstrate friction force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - warnings
MPL 30x20x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 16.0 cm
Hearing aid 10 Gs (1.0 mT) 12.5 cm
Timepiece 20 Gs (2.0 mT) 10.0 cm
Mobile device 40 Gs (4.0 mT) 7.5 cm
Remote 50 Gs (5.0 mT) 7.0 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Powerful magnet radiation is a real danger to IT equipment as well as medical implants. These magnets produce a field that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and plastic. Special caution must be taken by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MPL 30x20x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.96 km/h
(4.99 m/s)
 1.12 J
30 mm 28.76 km/h
(7.99 m/s)
 2.87 J
50 mm 37.04 km/h
(10.29 m/s)
 4.76 J
100 mm 52.37 km/h
(14.55 m/s)
 9.52 J
NdFeB products are delicate – a strong collision with metal risks their cracking. Pay attention to connection velocity – a magnet released freely turns into a projectile. Kinetic force can trigger coating fragments or injury to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear safety glasses when playing with powerful specimens.

Table 9: Coating parameters (durability)
MPL 30x20x20 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MPL 30x20x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 30 878 Mx 308.8 µWb
Pc Coefficient 0.74 High (Stable)
Flux value emitted by the pole surface. Key data in coil applications as well as sensors. Pc value determines the magnet's operating point.

Table 11: Submerged application
MPL 30x20x20 / N38

Environment Effective steel pull Effect
Air (land) 24.27 kg Standard
Water (riverbed) 27.79 kg
(+3.52 kg buoyancy gain)
+14.5%
Corrosion warning: 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. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains merely a fraction of its max power.

2. Steel saturation

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

3. Power loss vs temp

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.74

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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
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%
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: 020142-2026
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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 30x20x20 mm and a weight of 90 g, guarantees the highest quality connection. This magnetic block with a force of 238.07 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating strong flat 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 24.27 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 generators and material handling systems. Thanks to the flat surface and high force (approx. 24.27 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 30x20x20 / N38, we recommend utilizing 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. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 30x20x20 mm, which, at a weight of 90 g, makes it an element with high energy density. It is a magnetic block with dimensions 30x20x20 mm and a self-weight of 90 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Benefits

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They retain magnetic properties for around ten years – the loss is just ~1% (in theory),
  • They possess excellent resistance to magnetism drop due to external magnetic sources,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnetic induction on the surface of the magnet is impressive,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • Due to the potential of flexible molding and customization to specialized projects, NdFeB magnets can be created in a variety of shapes and sizes, which increases their versatility,
  • Huge importance in modern industrial fields – they serve a role in mass storage devices, electric drive systems, advanced medical instruments, as well as technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

Problematic aspects of neodymium magnets: application proposals
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of creating threads in the magnet and complicated shapes - recommended is a housing - magnetic holder.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these devices can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Magnetic strength at its maximum – what affects it?

Breakaway force is the result of a measurement for the most favorable conditions, assuming:
  • on a base made of structural steel, optimally conducting the magnetic flux
  • with a thickness of at least 10 mm
  • characterized by even structure
  • under conditions of ideal adhesion (surface-to-surface)
  • under axial application of breakaway force (90-degree angle)
  • at room temperature

Magnet lifting force in use – key factors

Holding efficiency impacted by working environment parameters, such as (from most important):
  • Clearance – existence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – 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.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material composition – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface quality – the more even the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Safety rules for work with NdFeB magnets
Nickel allergy

Certain individuals experience a contact allergy to Ni, which is the common plating for neodymium magnets. Frequent touching can result in a rash. We suggest wear safety gloves.

Keep away from electronics

Be aware: neodymium magnets generate a field that interferes with sensitive sensors. Maintain a separation from your phone, device, and navigation systems.

Dust is flammable

Mechanical processing of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Pacemakers

Individuals with a pacemaker should keep an safe separation from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Do not overheat magnets

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Finger safety

Big blocks can crush fingers in a fraction of a second. Under no circumstances place your hand between two attracting surfaces.

Data carriers

Do not bring magnets close to a wallet, computer, or TV. The magnetic field can permanently damage these devices and erase data from cards.

Handling guide

Before use, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Keep away from children

Only for adults. Tiny parts pose a choking risk, leading to serious injuries. Store away from kids and pets.

Magnet fragility

NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets will cause them shattering into small pieces.

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