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MPL 30x20x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020141

GTIN/EAN: 5906301811473

5.00

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

45 g

Magnetization Direction

↑ axial

Load capacity

19.53 kg / 191.55 N

Magnetic Induction

371.57 mT / 3716 Gs

Coating

[NiCuNi] Nickel

technical details »

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Technical - MPL 30x20x10 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020141
GTIN/EAN 5906301811473
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 10 mm [±0,1 mm]
Weight 45 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.53 kg / 191.55 N
Magnetic Induction ~ ? 371.57 mT / 3716 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x10 / 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 modeling of the magnet - report

These information are the direct effect of a physical analysis. Values rely on models for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Use these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - interaction chart
MPL 30x20x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3715 Gs
371.5 mT
 19.53 kg / 43.06 lbs
19530.0 g / 191.6 N
 crushing
1 mm 3464 Gs
346.4 mT
 16.98 kg / 37.44 lbs
16983.1 g / 166.6 N
 crushing
2 mm 3197 Gs
319.7 mT
 14.47 kg / 31.89 lbs
14466.6 g / 141.9 N
 crushing
3 mm 2927 Gs
292.7 mT
 12.12 kg / 26.73 lbs
12123.3 g / 118.9 N
 crushing
5 mm 2408 Gs
240.8 mT
 8.21 kg / 18.10 lbs
8207.8 g / 80.5 N
 warning
10 mm 1411 Gs
141.1 mT
 2.82 kg / 6.21 lbs
2815.6 g / 27.6 N
 warning
15 mm 832 Gs
83.2 mT
 0.98 kg / 2.16 lbs
979.7 g / 9.6 N
 low risk
20 mm 512 Gs
51.2 mT
 0.37 kg / 0.82 lbs
371.2 g / 3.6 N
 low risk
30 mm 224 Gs
22.4 mT
 0.07 kg / 0.16 lbs
70.7 g / 0.7 N
 low risk
50 mm 65 Gs
6.5 mT
 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
 low risk
Pulling power weakens drastically with every subsequent millimeter of spacing. Keep in mind that even a very thin break (e.g., dirt, varnish, veneer) significantly diminishes the holding power. Magnetic products hold strongest at the point of direct contact; air break kills the force. Analyze how quickly the pull force fall, when the magnet does not adhere flatly to the metal substrate. When designing the assembly, avoid redundant distances.

Table 2: Sliding force (wall)
MPL 30x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.91 kg / 8.61 lbs
3906.0 g / 38.3 N
1 mm Stal (~0.2) 3.40 kg / 7.49 lbs
3396.0 g / 33.3 N
2 mm Stal (~0.2) 2.89 kg / 6.38 lbs
2894.0 g / 28.4 N
3 mm Stal (~0.2) 2.42 kg / 5.34 lbs
2424.0 g / 23.8 N
5 mm Stal (~0.2) 1.64 kg / 3.62 lbs
1642.0 g / 16.1 N
10 mm Stal (~0.2) 0.56 kg / 1.24 lbs
564.0 g / 5.5 N
15 mm Stal (~0.2) 0.20 kg / 0.43 lbs
196.0 g / 1.9 N
20 mm Stal (~0.2) 0.07 kg / 0.16 lbs
74.0 g / 0.7 N
30 mm Stal (~0.2) 0.01 kg / 0.03 lbs
14.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
This section calculates the theoretical weight limit needed to cause the slippage of the magnet down on a upright steel wall (considering typical friction coefficient). The holding force depends on the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 30x20x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.86 kg / 12.92 lbs
5859.0 g / 57.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.91 kg / 8.61 lbs
3906.0 g / 38.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.95 kg / 4.31 lbs
1953.0 g / 19.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.77 kg / 21.53 lbs
9765.0 g / 95.8 N
When mounting a magnet on a vertical plane (e.g., a car body), it you can count on barely about 1/5 of its maximum pull force. Gravity as well as a low friction coefficient influence the fact that magnets move down easier than they pop off the substrate. Planning a hanger? Note that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the magnet will slide down under a much lighter cargo. Utilizing a rubberized coating can significantly improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 30x20x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.98 kg / 2.15 lbs
976.5 g / 9.6 N
1 mm
13%
 2.44 kg / 5.38 lbs
2441.3 g / 23.9 N
2 mm
25%
 4.88 kg / 10.76 lbs
4882.5 g / 47.9 N
3 mm
38%
 7.32 kg / 16.15 lbs
7323.8 g / 71.8 N
5 mm
63%
 12.21 kg / 26.91 lbs
12206.3 g / 119.7 N
10 mm
100%
 19.53 kg / 43.06 lbs
19530.0 g / 191.6 N
11 mm
100%
 19.53 kg / 43.06 lbs
19530.0 g / 191.6 N
12 mm
100%
 19.53 kg / 43.06 lbs
19530.0 g / 191.6 N
A too thin steel is not enough to focus the entire magnetic field, which weakens actual performance of the magnet. If you install a neodymium to a weak sheet, the field will pass right through and the attraction force will be weaker. To squeeze full efficiency of this neodymium's potential, you need a suitably thick backing of steel. The saturation effect causes that on delicate walls (e.g., car bodies), the product works worse. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal stability (stability) - thermal limit
MPL 30x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.53 kg / 43.06 lbs
19530.0 g / 191.6 N
 OK
40 °C -2.2% 19.10 kg / 42.11 lbs
19100.3 g / 187.4 N
 OK
60 °C -4.4% 18.67 kg / 41.16 lbs
18670.7 g / 183.2 N
80 °C -6.6% 18.24 kg / 40.21 lbs
18241.0 g / 178.9 N
100 °C -28.8% 13.91 kg / 30.66 lbs
13905.4 g / 136.4 N
Ordinary NdFeB products change their properties power past the thermal threshold. Watch out for overheating – heat can permanently destroy this product. With every degree above norm, the magnet's power briefly drops. Avoid using this magnet in hot environments higher than its working range. Ignoring the limit will result in irreversible degradation of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) risk losing magnetic properties under lower heat stress than long magnets. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 30x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 51.05 kg / 112.54 lbs
5 124 Gs
7.66 kg / 16.88 lbs
7657 g / 75.1 N
 N/A
1 mm 47.76 kg / 105.28 lbs
7 186 Gs
7.16 kg / 15.79 lbs
7163 g / 70.3 N
 42.98 kg / 94.76 lbs
~0 Gs
2 mm 44.39 kg / 97.86 lbs
6 928 Gs
6.66 kg / 14.68 lbs
6658 g / 65.3 N
 39.95 kg / 88.08 lbs
~0 Gs
3 mm 41.06 kg / 90.52 lbs
6 663 Gs
6.16 kg / 13.58 lbs
6159 g / 60.4 N
 36.95 kg / 81.47 lbs
~0 Gs
5 mm 34.68 kg / 76.45 lbs
6 124 Gs
5.20 kg / 11.47 lbs
5202 g / 51.0 N
 31.21 kg / 68.81 lbs
~0 Gs
10 mm 21.45 kg / 47.30 lbs
4 817 Gs
3.22 kg / 7.09 lbs
3218 g / 31.6 N
 19.31 kg / 42.57 lbs
~0 Gs
20 mm 7.36 kg / 16.22 lbs
2 821 Gs
1.10 kg / 2.43 lbs
1104 g / 10.8 N
 6.62 kg / 14.60 lbs
~0 Gs
50 mm 0.40 kg / 0.89 lbs
662 Gs
0.06 kg / 0.13 lbs
61 g / 0.6 N
 0.36 kg / 0.80 lbs
~0 Gs
60 mm 0.18 kg / 0.41 lbs
447 Gs
0.03 kg / 0.06 lbs
28 g / 0.3 N
 0.17 kg / 0.37 lbs
~0 Gs
70 mm 0.09 kg / 0.20 lbs
314 Gs
0.01 kg / 0.03 lbs
14 g / 0.1 N
 0.08 kg / 0.18 lbs
~0 Gs
80 mm 0.05 kg / 0.11 lbs
228 Gs
0.01 kg / 0.02 lbs
7 g / 0.1 N
 0.04 kg / 0.10 lbs
~0 Gs
90 mm 0.03 kg / 0.06 lbs
170 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
100 mm 0.02 kg / 0.03 lbs
130 Gs
0.00 kg / 0.01 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
Two magnetic products attract each other from a significantly greater distance than a magnet and steel setup. The connection of two magnets creates a more powerful interaction and a larger range of action. Want to build a solid fastener? Apply two magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the impact force is massive. The repulsion force is marginally weaker than the attraction, but still large.
*Flux density between like poles reaches ~0 Gs in the exact middle between the magnets (due to field cancellation).
Attention: Calculations show sliding force of two same magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - precautionary measures
MPL 30x20x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.0 cm
Mechanical watch 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
Powerful magnet radiation poses a serious hazard to electronic devices as well as pacemakers. These NdFeB products produce a field that disrupts operation of digital equipment. Remember: the invisible magnetic field passes through tissues and housings. Increased vigilance must be taken by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MPL 30x20x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.82 km/h
(6.34 m/s)
 0.90 J
30 mm 36.47 km/h
(10.13 m/s)
 2.31 J
50 mm 46.99 km/h
(13.05 m/s)
 3.83 J
100 mm 66.44 km/h
(18.46 m/s)
 7.66 J
NdFeB products are delicate – a collision with steel risks their cracking. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or injury to fingers. Always hold the magnet during mounting so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when working with large magnets.

Table 9: Coating parameters (durability)
MPL 30x20x10 / 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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MPL 30x20x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 801 Mx 228.0 µWb
Pc Coefficient 0.46 Low (Flat)
Flux value passing through the magnet pole. Key data when building generators and motors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
MPL 30x20x10 / N38

Environment Effective steel pull Effect
Air (land) 19.53 kg Standard
Water (riverbed) 22.36 kg
(+2.83 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains just a fraction of its nominal pull.

2. Steel thickness impact

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

3. Heat tolerance

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.46

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.

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%
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: 020141-2026
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Model MPL 30x20x10 / N38 features a flat shape and industrial pulling force, making it an ideal solution for building separators and machines. This magnetic block with a force of 191.55 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.
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 19.53 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. 19.53 kg), they are ideal as closers in furniture making and mounting elements in automation. 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 30x20x10 / N38, we recommend utilizing 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. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 30x20x10 / N38 model is magnetized through the thickness (dimension 10 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (30x20 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 30x20x10 mm, which, at a weight of 45 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 30x20x10 mm and a self-weight of 45 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros as well as cons of neodymium magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • Neodymium magnets are distinguished by remarkably resistant to loss of magnetic properties caused by external interference,
  • A magnet with a shiny gold surface is more attractive,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of exact shaping as well as modifying to precise needs,
  • Wide application in modern technologies – they serve a role in mass storage devices, electromotive mechanisms, medical equipment, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in small systems

Disadvantages

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in strength. 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
  • 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, in case of application outdoors
  • We recommend a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
  • 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. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process medical after entering the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what affects it?

The specified lifting capacity represents the maximum value, measured under optimal environment, specifically:
  • using a plate made of high-permeability steel, acting as a circuit closing element
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with an ground contact surface
  • with direct contact (without coatings)
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature

Lifting capacity in real conditions – factors

In practice, the actual lifting capacity results from several key aspects, ranked from the most important:
  • Clearance – the presence of any layer (paint, tape, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Steel grade – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity was assessed by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet and the plate reduces the load capacity.

H&S for magnets
Finger safety

Watch your fingers. Two powerful magnets will join immediately with a force of several hundred kilograms, destroying anything in their path. Be careful!

Protect data

Powerful magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.

Risk of cracking

Protect your eyes. Magnets can explode upon violent connection, launching sharp fragments into the air. We recommend safety glasses.

No play value

Neodymium magnets are not intended for children. Eating several magnets may result in them pinching intestinal walls, which poses a severe health hazard and necessitates immediate surgery.

Allergy Warning

A percentage of the population experience a sensitization to nickel, which is the common plating for NdFeB magnets. Prolonged contact can result in a rash. We suggest wear safety gloves.

Permanent damage

Do not overheat. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, ask us about HT versions (H, SH, UH).

Pacemakers

Warning for patients: Powerful magnets disrupt electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

Safe operation

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

Fire risk

Powder produced during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Magnetic interference

A powerful magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Do not bring magnets close to a smartphone to avoid breaking the sensors.

Safety First! Details about risks in the article: Safety of working with magnets.