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MPL 30x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020138

GTIN/EAN: 5906301811442

5.00

length

30 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

11.25 g

Magnetization Direction

↑ axial

Load capacity

8.89 kg / 87.23 N

Magnetic Induction

329.52 mT / 3295 Gs

Coating

[NiCuNi] Nickel

4.26 with VAT / pcs + price for transport

3.46 ZŁ net + 23% VAT / pcs

bulk discounts:

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Force along with appearance of a neodymium magnet can be calculated on our force calculator.

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Product card - MPL 30x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 30x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020138
GTIN/EAN 5906301811442
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 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 11.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 8.89 kg / 87.23 N
Magnetic Induction ~ ? 329.52 mT / 3295 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x10x5 / 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 magnet - report

The following values constitute the direct effect of a engineering calculation. Values rely on algorithms for the material Nd2Fe14B. Actual parameters may differ from theoretical values. Please consider these calculations as a reference point when designing systems.

Table 1: Static force (pull vs gap) - interaction chart
MPL 30x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3294 Gs
329.4 mT
8.89 kg / 19.60 lbs
8890.0 g / 87.2 N
warning
1 mm 2866 Gs
286.6 mT
6.73 kg / 14.84 lbs
6731.1 g / 66.0 N
warning
2 mm 2424 Gs
242.4 mT
4.82 kg / 10.62 lbs
4816.4 g / 47.2 N
warning
3 mm 2022 Gs
202.2 mT
3.35 kg / 7.38 lbs
3349.6 g / 32.9 N
warning
5 mm 1397 Gs
139.7 mT
1.60 kg / 3.53 lbs
1600.3 g / 15.7 N
weak grip
10 mm 615 Gs
61.5 mT
0.31 kg / 0.68 lbs
309.8 g / 3.0 N
weak grip
15 mm 314 Gs
31.4 mT
0.08 kg / 0.18 lbs
80.6 g / 0.8 N
weak grip
20 mm 177 Gs
17.7 mT
0.03 kg / 0.06 lbs
25.8 g / 0.3 N
weak grip
30 mm 70 Gs
7.0 mT
0.00 kg / 0.01 lbs
4.1 g / 0.0 N
weak grip
50 mm 19 Gs
1.9 mT
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
weak grip

Table 2: Vertical hold (wall)
MPL 30x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.78 kg / 3.92 lbs
1778.0 g / 17.4 N
1 mm Stal (~0.2) 1.35 kg / 2.97 lbs
1346.0 g / 13.2 N
2 mm Stal (~0.2) 0.96 kg / 2.13 lbs
964.0 g / 9.5 N
3 mm Stal (~0.2) 0.67 kg / 1.48 lbs
670.0 g / 6.6 N
5 mm Stal (~0.2) 0.32 kg / 0.71 lbs
320.0 g / 3.1 N
10 mm Stal (~0.2) 0.06 kg / 0.14 lbs
62.0 g / 0.6 N
15 mm Stal (~0.2) 0.02 kg / 0.04 lbs
16.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 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) - vertical pull
MPL 30x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.67 kg / 5.88 lbs
2667.0 g / 26.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.78 kg / 3.92 lbs
1778.0 g / 17.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.89 kg / 1.96 lbs
889.0 g / 8.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.45 kg / 9.80 lbs
4445.0 g / 43.6 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 30x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.89 kg / 1.96 lbs
889.0 g / 8.7 N
1 mm
25%
2.22 kg / 4.90 lbs
2222.5 g / 21.8 N
2 mm
50%
4.45 kg / 9.80 lbs
4445.0 g / 43.6 N
3 mm
75%
6.67 kg / 14.70 lbs
6667.5 g / 65.4 N
5 mm
100%
8.89 kg / 19.60 lbs
8890.0 g / 87.2 N
10 mm
100%
8.89 kg / 19.60 lbs
8890.0 g / 87.2 N
11 mm
100%
8.89 kg / 19.60 lbs
8890.0 g / 87.2 N
12 mm
100%
8.89 kg / 19.60 lbs
8890.0 g / 87.2 N

Table 5: Working in heat (stability) - power drop
MPL 30x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 8.89 kg / 19.60 lbs
8890.0 g / 87.2 N
OK
40 °C -2.2% 8.69 kg / 19.17 lbs
8694.4 g / 85.3 N
OK
60 °C -4.4% 8.50 kg / 18.74 lbs
8498.8 g / 83.4 N
80 °C -6.6% 8.30 kg / 18.31 lbs
8303.3 g / 81.5 N
100 °C -28.8% 6.33 kg / 13.95 lbs
6329.7 g / 62.1 N

Table 6: Two magnets (repulsion) - field collision
MPL 30x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 20.06 kg / 44.23 lbs
4 689 Gs
3.01 kg / 6.63 lbs
3010 g / 29.5 N
N/A
1 mm 17.63 kg / 38.86 lbs
6 174 Gs
2.64 kg / 5.83 lbs
2644 g / 25.9 N
15.86 kg / 34.98 lbs
~0 Gs
2 mm 15.19 kg / 33.49 lbs
5 732 Gs
2.28 kg / 5.02 lbs
2279 g / 22.4 N
13.67 kg / 30.14 lbs
~0 Gs
3 mm 12.92 kg / 28.47 lbs
5 285 Gs
1.94 kg / 4.27 lbs
1937 g / 19.0 N
11.62 kg / 25.63 lbs
~0 Gs
5 mm 9.08 kg / 20.03 lbs
4 432 Gs
1.36 kg / 3.00 lbs
1363 g / 13.4 N
8.18 kg / 18.02 lbs
~0 Gs
10 mm 3.61 kg / 7.96 lbs
2 795 Gs
0.54 kg / 1.19 lbs
542 g / 5.3 N
3.25 kg / 7.17 lbs
~0 Gs
20 mm 0.70 kg / 1.54 lbs
1 230 Gs
0.10 kg / 0.23 lbs
105 g / 1.0 N
0.63 kg / 1.39 lbs
~0 Gs
50 mm 0.02 kg / 0.05 lbs
217 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
0.02 kg / 0.04 lbs
~0 Gs
60 mm 0.01 kg / 0.02 lbs
141 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.01 lbs
96 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 / 0.00 lbs
68 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
50 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
38 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Safety (HSE) (electronics) - warnings
MPL 30x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.5 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Mechanical watch 20 Gs (2.0 mT) 5.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Car key 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Impact energy (cracking risk) - warning
MPL 30x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.96 km/h
(8.04 m/s)
0.36 J
30 mm 49.12 km/h
(13.64 m/s)
1.05 J
50 mm 63.39 km/h
(17.61 m/s)
1.74 J
100 mm 89.65 km/h
(24.90 m/s)
3.49 J

Table 9: Corrosion resistance
MPL 30x10x5 / 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: Construction data (Pc)
MPL 30x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 370 Mx 93.7 µWb
Pc Coefficient 0.35 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 30x10x5 / N38

Environment Effective steel pull Effect
Air (land) 8.89 kg Standard
Water (riverbed) 10.18 kg
(+1.29 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds only approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) severely weakens 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) = 0.35

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
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%
Environmental data
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: 020138-2026
Measurement Calculator
Magnet pull force

Magnetic Field

Check out also proposals

This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 30x10x5 mm and a weight of 11.25 g, guarantees premium class connection. This rectangular block with a force of 87.23 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.
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. Watch your fingers! Magnets with a force of 8.89 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 30x10x5 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as fasteners 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.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
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 (30x10 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: 30 mm (length), 10 mm (width), and 5 mm (thickness). It is a magnetic block with dimensions 30x10x5 mm and a self-weight of 11.25 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 Nd2Fe14B magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • Neodymium magnets are characterized by extremely resistant to demagnetization caused by magnetic disturbances,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnetic induction on the surface of the magnet is very high,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to the potential of flexible molding and customization to specialized projects, NdFeB magnets can be produced in a wide range of shapes and sizes, which increases their versatility,
  • Key role in high-tech industry – they are used in hard drives, drive modules, precision medical tools, as well as modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Cons

What to avoid - cons of neodymium magnets: application proposals
  • At very strong impacts they can crack, therefore we recommend 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 lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing nuts and complex shapes in magnets, we recommend using a housing - magnetic holder.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these products are able to 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

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

The load parameter shown concerns the limit force, measured under optimal environment, specifically:
  • using a sheet made of high-permeability steel, acting as a circuit closing element
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with an ideally smooth touching surface
  • with total lack of distance (without impurities)
  • for force acting at a right angle (in the magnet axis)
  • at room temperature

Magnet lifting force in use – key factors

Effective lifting capacity is influenced by specific conditions, mainly (from most important):
  • Distance – existence of any layer (paint, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Plate thickness – too thin plate causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Steel grade – ideal substrate is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was determined by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with neodymium magnets
Warning for allergy sufferers

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If an allergic reaction happens, cease handling magnets and wear gloves.

Permanent damage

Watch the temperature. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.

Keep away from electronics

Note: rare earth magnets generate a field that interferes with precision electronics. Maintain a separation from your phone, tablet, and navigation systems.

Fire warning

Drilling and cutting of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Threat to electronics

Avoid bringing magnets close to a wallet, computer, or screen. The magnetism can permanently damage these devices and erase data from cards.

Handling rules

Before use, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Danger to pacemakers

Warning for patients: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Choking Hazard

Only for adults. Small elements pose a choking risk, causing serious injuries. Store away from children and animals.

Crushing risk

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

Protective goggles

Beware of splinters. Magnets can explode upon violent connection, ejecting shards into the air. Wear goggles.

Safety First! 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