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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

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Force and shape of a neodymium magnet can be calculated using our magnetic calculator.

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Detailed specification - 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

Technical modeling of the magnet - report

These data constitute the direct effect of a mathematical calculation. Values rely on algorithms for the material Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs distance) - 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 force (vertical surface)
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) - power losses
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: Thermal stability (material behavior) - resistance threshold
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 (attraction) - field range
MPL 30x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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: Protective zones (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
Mobile device 40 Gs (4.0 mT) 4.0 cm
Remote 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: Dynamics (cracking risk) - collision effects
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: Surface protection spec
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: Electrical 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: Physics of underwater searching
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Warning: On a vertical surface, the magnet holds only a fraction of its max power.

2. Plate thickness effect

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

3. Temperature resistance

*For N38 material, the max working temp 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.

Technical specification and ecology
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%
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

Field Strength

See also products

Model MPL 30x10x5 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. 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.
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 8.89 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 8.89 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 30x10x5 / N38, it is best to use strong epoxy glues (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. Remember to roughen and wash 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). The key parameter here is the lifting capacity amounting to approximately 8.89 kg (force ~87.23 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of Nd2Fe14B magnets.

Advantages

In addition to their magnetic capacity, 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),
  • They are extremely resistant to demagnetization induced by external disturbances,
  • A magnet with a shiny silver surface looks better,
  • Magnets are characterized by very high magnetic induction on the surface,
  • 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 accurate modeling and adjusting to individual needs,
  • Huge importance in modern technologies – they are used in data components, brushless drives, diagnostic systems, and multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Cons of neodymium magnets and proposals for their use:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power 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. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complex shapes in magnets, we recommend using cover - magnetic mechanism.
  • Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Additionally, small components of these devices can complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Breakaway strength of the magnet in ideal conditionswhat it depends on?

Breakaway force was defined for ideal contact conditions, including:
  • using a plate made of mild steel, functioning as a circuit closing element
  • whose transverse dimension equals approx. 10 mm
  • characterized by smoothness
  • under conditions of ideal adhesion (surface-to-surface)
  • for force acting at a right angle (in the magnet axis)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Bear in mind that the magnet holding will differ influenced by the following factors, in order of importance:
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Steel grade – ideal substrate is pure iron steel. Cast iron may attract less.
  • Plate texture – ground elements guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Temperature influence – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet and the plate lowers the load capacity.

Safety rules for work with neodymium magnets
Threat to navigation

A powerful magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to prevent damaging the sensors.

Power loss in heat

Do not overheat. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Metal Allergy

A percentage of the population suffer from a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Extended handling might lead to dermatitis. It is best to wear protective gloves.

This is not a toy

Strictly keep magnets out of reach of children. Choking hazard is significant, and the consequences of magnets clamping inside the body are tragic.

Threat to electronics

Equipment safety: Strong magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, mechanical watches).

Mechanical processing

Drilling and cutting of NdFeB material carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Physical harm

Risk of injury: The attraction force is so immense that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Handling guide

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

Shattering risk

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets leads to them cracking into small pieces.

Warning for heart patients

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Danger! Want to know more? Check our post: Are neodymium magnets dangerous?