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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

technical details »

43.22 ZŁ with VAT / pcs + price for transport

35.14 ZŁ net + 23% VAT / pcs

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Technical specification - 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

Engineering modeling of the product - data

Presented values constitute the result of a engineering analysis. Values were calculated on models for the class Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Treat these calculations as a reference point for designers.

Table 1: Static force (force 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
 critical level
1 mm 4730 Gs
473.0 mT
 20.68 kg / 45.60 pounds
20685.0 g / 202.9 N
 critical level
2 mm 4335 Gs
433.5 mT
 17.37 kg / 38.30 pounds
17370.7 g / 170.4 N
 critical level
3 mm 3950 Gs
395.0 mT
 14.43 kg / 31.80 pounds
14425.2 g / 141.5 N
 critical level
5 mm 3240 Gs
324.0 mT
 9.71 kg / 21.40 pounds
9706.2 g / 95.2 N
 medium risk
10 mm 1923 Gs
192.3 mT
 3.42 kg / 7.53 pounds
3417.4 g / 33.5 N
 medium risk
15 mm 1163 Gs
116.3 mT
 1.25 kg / 2.76 pounds
1250.2 g / 12.3 N
 weak grip
20 mm 736 Gs
73.6 mT
 0.50 kg / 1.10 pounds
500.4 g / 4.9 N
 weak grip
30 mm 338 Gs
33.8 mT
 0.11 kg / 0.23 pounds
105.3 g / 1.0 N
 weak grip
50 mm 106 Gs
10.6 mT
 0.01 kg / 0.02 pounds
10.3 g / 0.1 N
 weak grip
Pulling power decreases sharply with every mm of spacing. Keep in mind that even the smallest gap (e.g., dirt, varnish, dust) strongly reduces the pull force. Magnets hold optimally in perfect adhesion; distance weakens the power. Observe how rapidly the load capacity plummet, when the magnet does not touch tightly to the steel surface. When designing the arrangement, avoid additional spacers.

Table 2: Sliding load (wall)
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 defines the theoretical weight limit necessary to initiate the downward movement of the magnet down along a upright steel plate (considering typical friction coefficient). This value depends on the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 upright wall (e.g., a fridge), it will only hold just approx. 1/5 of nominal attraction strength. Gravity as well as a weak degree of grip cause that holders move down faster than they pop off the substrate. Planning a hanger? Remember that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the element will give way down under a much lighter cargo. Application of an anti-slip coating can drastically increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
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 is unable to focus the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a too thin substrate, the flux will penetrate right through and the pull force will drop sharply. To utilize the maximum of this neodymium's potential, you need a suitably thick backing of steel. The saturation phenomenon causes that on thin elements (e.g., thin profiles), the holder works worse. We advise picking the steel thickness from these parameters.

Table 5: Thermal stability (stability) - 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 power above the temperature limit. Protect against heat – heat can irreversibly destroy this product. As the temperature rises, the magnet's power temporarily lowers. Avoid using this product close to ovens exceeding its safe range. Too high temperature will lead to destruction of magnetism.
*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) are more susceptible to demagnetization sooner than taller cylinders. Warning indicator in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field collision
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 magnet and sheet combination. Such a system of two magnets creates a more powerful interaction and a further horizon of performance. Want to build a powerful holder? Apply two magnets instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the collision energy is massive. The repulsion force is a bit weaker than the connection force, but still impressive.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
Attention: Calculations show friction force of a pair of identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - precautionary measures
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 poses a large risk to electronic devices and pacemakers. These NdFeB products generate a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field penetrates the body and housings. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
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
Neodymium magnets are prone to chipping – a violent impact against metal can result in shattering. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Impact energy can destroy the magnet or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't hit violently against the metal. A collision at high speed means shattering of the neodymium. Wear eye protection when playing with powerful specimens.

Table 9: Anti-corrosion coating 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MPL 30x20x20 / N38

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

Table 11: Underwater work (magnet fishing)
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

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

2. Plate thickness effect

*Thin steel (e.g. computer case) severely weakens the holding force.

3. Temperature resistance

*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.

Engineering data and GPSR
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%
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
Magnet Unit Converter
Magnet pull force
Magnetic Induction
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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 30x20x20 mm and a weight of 90 g, guarantees premium class connection. As a magnetic bar with high power (approx. 24.27 kg), this product is available immediately from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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 24.27 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 30x20x20 / 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. 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. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. 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. 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: 30 mm (length), 20 mm (width), and 20 mm (thickness). 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 product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of neodymium magnets.

Strengths

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They do not lose power, even over approximately ten years – the decrease in power is only ~1% (theoretically),
  • They are extremely resistant to demagnetization induced by external field influence,
  • The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to look better,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to the possibility of precise forming and customization to custom needs, magnetic components can be modeled in a variety of shapes and sizes, which makes them more universal,
  • Universal use in modern technologies – they are utilized in data components, motor assemblies, advanced medical instruments, as well as technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complicated forms in magnets, we propose using a housing - magnetic mount.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these products can be problematic in diagnostics medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Magnetic strength at its maximum – what contributes to it?

Magnet power is the result of a measurement for optimal configuration, assuming:
  • with the application of a yoke made of special test steel, ensuring maximum field concentration
  • with a thickness no less than 10 mm
  • with an ground touching surface
  • with total lack of distance (without paint)
  • under axial force vector (90-degree angle)
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is affected by specific conditions, such as (from most important):
  • Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Load vector – highest force is reached only during perpendicular pulling. The shear force of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Plate material – mild steel attracts best. Alloy steels lower magnetic permeability and lifting capacity.
  • Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces weaken the grip.
  • Temperature – heating the magnet causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet and the plate lowers the holding force.

Safe handling of neodymium magnets
Bone fractures

Big blocks can smash fingers in a fraction of a second. Do not place your hand between two strong magnets.

Do not underestimate power

Exercise caution. Rare earth magnets act from a long distance and connect with huge force, often quicker than you can move away.

Product not for children

Absolutely keep magnets out of reach of children. Ingestion danger is significant, and the effects of magnets connecting inside the body are very dangerous.

Permanent damage

Watch the temperature. Exposing the magnet to high heat will permanently weaken its properties and pulling force.

Allergy Warning

Some people have a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Frequent touching may cause skin redness. We suggest use protective gloves.

GPS and phone interference

Be aware: rare earth magnets produce a field that disrupts precision electronics. Maintain a separation from your phone, device, and navigation systems.

Protect data

Avoid bringing magnets close to a purse, laptop, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Eye protection

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

Dust is flammable

Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.

Life threat

Medical warning: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Security! Details about hazards in the article: Safety of working with magnets.