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MPL 30x15x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020389

GTIN/EAN: 5906301811886

5.00

length

30 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

33.75 g

Magnetization Direction

↑ axial

Load capacity

16.84 kg / 165.22 N

Magnetic Induction

413.45 mT / 4135 Gs

Coating

[NiCuNi] Nickel

24.48 with VAT / pcs + price for transport

19.90 ZŁ net + 23% VAT / pcs

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Technical specification of the product - MPL 30x15x10 / N38 - lamellar magnet

Specification / characteristics - MPL 30x15x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020389
GTIN/EAN 5906301811886
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 15 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 33.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 16.84 kg / 165.22 N
Magnetic Induction ~ ? 413.45 mT / 4135 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x15x10 / 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 analysis of the magnet - report

The following data represent the direct effect of a engineering calculation. Values are based on algorithms for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Treat these data as a reference point for designers.

Table 1: Static pull force (force vs gap) - power drop
MPL 30x15x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4133 Gs
413.3 mT
16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
dangerous!
1 mm 3754 Gs
375.4 mT
13.89 kg / 30.62 lbs
13889.5 g / 136.3 N
dangerous!
2 mm 3365 Gs
336.5 mT
11.16 kg / 24.60 lbs
11159.2 g / 109.5 N
dangerous!
3 mm 2988 Gs
298.8 mT
8.80 kg / 19.41 lbs
8803.6 g / 86.4 N
warning
5 mm 2321 Gs
232.1 mT
5.31 kg / 11.71 lbs
5309.9 g / 52.1 N
warning
10 mm 1225 Gs
122.5 mT
1.48 kg / 3.26 lbs
1480.1 g / 14.5 N
low risk
15 mm 684 Gs
68.4 mT
0.46 kg / 1.02 lbs
461.6 g / 4.5 N
low risk
20 mm 409 Gs
40.9 mT
0.16 kg / 0.36 lbs
164.8 g / 1.6 N
low risk
30 mm 173 Gs
17.3 mT
0.03 kg / 0.07 lbs
29.6 g / 0.3 N
low risk
50 mm 50 Gs
5.0 mT
0.00 kg / 0.01 lbs
2.4 g / 0.0 N
low risk

Table 2: Sliding hold (wall)
MPL 30x15x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.37 kg / 7.43 lbs
3368.0 g / 33.0 N
1 mm Stal (~0.2) 2.78 kg / 6.12 lbs
2778.0 g / 27.3 N
2 mm Stal (~0.2) 2.23 kg / 4.92 lbs
2232.0 g / 21.9 N
3 mm Stal (~0.2) 1.76 kg / 3.88 lbs
1760.0 g / 17.3 N
5 mm Stal (~0.2) 1.06 kg / 2.34 lbs
1062.0 g / 10.4 N
10 mm Stal (~0.2) 0.30 kg / 0.65 lbs
296.0 g / 2.9 N
15 mm Stal (~0.2) 0.09 kg / 0.20 lbs
92.0 g / 0.9 N
20 mm Stal (~0.2) 0.03 kg / 0.07 lbs
32.0 g / 0.3 N
30 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 30x15x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.05 kg / 11.14 lbs
5052.0 g / 49.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.37 kg / 7.43 lbs
3368.0 g / 33.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.68 kg / 3.71 lbs
1684.0 g / 16.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
8.42 kg / 18.56 lbs
8420.0 g / 82.6 N

Table 4: Material efficiency (substrate influence) - power losses
MPL 30x15x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.84 kg / 1.86 lbs
842.0 g / 8.3 N
1 mm
13%
2.11 kg / 4.64 lbs
2105.0 g / 20.7 N
2 mm
25%
4.21 kg / 9.28 lbs
4210.0 g / 41.3 N
3 mm
38%
6.31 kg / 13.92 lbs
6315.0 g / 62.0 N
5 mm
63%
10.53 kg / 23.20 lbs
10525.0 g / 103.3 N
10 mm
100%
16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
11 mm
100%
16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
12 mm
100%
16.84 kg / 37.13 lbs
16840.0 g / 165.2 N

Table 5: Working in heat (stability) - power drop
MPL 30x15x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
OK
40 °C -2.2% 16.47 kg / 36.31 lbs
16469.5 g / 161.6 N
OK
60 °C -4.4% 16.10 kg / 35.49 lbs
16099.0 g / 157.9 N
80 °C -6.6% 15.73 kg / 34.68 lbs
15728.6 g / 154.3 N
100 °C -28.8% 11.99 kg / 26.43 lbs
11990.1 g / 117.6 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 30x15x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 47.39 kg / 104.48 lbs
5 357 Gs
7.11 kg / 15.67 lbs
7109 g / 69.7 N
N/A
1 mm 43.23 kg / 95.30 lbs
7 895 Gs
6.48 kg / 14.29 lbs
6484 g / 63.6 N
38.90 kg / 85.77 lbs
~0 Gs
2 mm 39.09 kg / 86.17 lbs
7 507 Gs
5.86 kg / 12.93 lbs
5863 g / 57.5 N
35.18 kg / 77.56 lbs
~0 Gs
3 mm 35.13 kg / 77.45 lbs
7 117 Gs
5.27 kg / 11.62 lbs
5270 g / 51.7 N
31.62 kg / 69.70 lbs
~0 Gs
5 mm 27.95 kg / 61.61 lbs
6 348 Gs
4.19 kg / 9.24 lbs
4192 g / 41.1 N
25.15 kg / 55.45 lbs
~0 Gs
10 mm 14.94 kg / 32.94 lbs
4 642 Gs
2.24 kg / 4.94 lbs
2242 g / 22.0 N
13.45 kg / 29.65 lbs
~0 Gs
20 mm 4.17 kg / 9.18 lbs
2 451 Gs
0.62 kg / 1.38 lbs
625 g / 6.1 N
3.75 kg / 8.26 lbs
~0 Gs
50 mm 0.19 kg / 0.41 lbs
519 Gs
0.03 kg / 0.06 lbs
28 g / 0.3 N
0.17 kg / 0.37 lbs
~0 Gs
60 mm 0.08 kg / 0.18 lbs
347 Gs
0.01 kg / 0.03 lbs
13 g / 0.1 N
0.08 kg / 0.17 lbs
~0 Gs
70 mm 0.04 kg / 0.09 lbs
242 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
0.04 kg / 0.08 lbs
~0 Gs
80 mm 0.02 kg / 0.05 lbs
175 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
0.02 kg / 0.04 lbs
~0 Gs
90 mm 0.01 kg / 0.03 lbs
130 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
0.01 kg / 0.02 lbs
~0 Gs
100 mm 0.01 kg / 0.02 lbs
99 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Safety (HSE) (implants) - warnings
MPL 30x15x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.0 cm
Hearing aid 10 Gs (1.0 mT) 9.5 cm
Timepiece 20 Gs (2.0 mT) 7.5 cm
Mobile device 40 Gs (4.0 mT) 5.5 cm
Remote 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm

Table 8: Impact energy (kinetic energy) - warning
MPL 30x15x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.73 km/h
(6.59 m/s)
0.73 J
30 mm 39.06 km/h
(10.85 m/s)
1.99 J
50 mm 50.38 km/h
(13.99 m/s)
3.30 J
100 mm 71.24 km/h
(19.79 m/s)
6.61 J

Table 9: Anti-corrosion coating durability
MPL 30x15x10 / 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 (Flux)
MPL 30x15x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 18 390 Mx 183.9 µWb
Pc Coefficient 0.52 Low (Flat)

Table 11: Physics of underwater searching
MPL 30x15x10 / N38

Environment Effective steel pull Effect
Air (land) 16.84 kg Standard
Water (riverbed) 19.28 kg
(+2.44 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. Sliding resistance

*Warning: On a vertical surface, the magnet retains merely approx. 20-30% of its max power.

2. Plate thickness effect

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

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.52

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 and environmental data
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: 020389-2026
Measurement Calculator
Magnet pull force

Magnetic Field

Other proposals

This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 30x15x10 mm and a weight of 33.75 g, guarantees the highest quality connection. This rectangular block with a force of 165.22 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. To separate the MPL 30x15x10 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. 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. 16.84 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 30x15x10 / 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 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 (30x15 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 30 mm (length), 15 mm (width), and 10 mm (thickness). It is a magnetic block with dimensions 30x15x10 mm and a self-weight of 33.75 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of rare earth magnets.

Pros

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • They do not lose power, even over around ten years – the decrease in power is only ~1% (based on measurements),
  • Magnets very well defend themselves against demagnetization caused by external fields,
  • The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Magnets are characterized by extremely high magnetic induction on the working surface,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of custom machining and adjusting to concrete conditions,
  • Huge importance in modern technologies – they are commonly used in HDD drives, drive modules, medical devices, also technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Limited ability of producing threads in the magnet and complicated shapes - preferred is cover - magnet mounting.
  • Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • With mass production the cost of neodymium magnets is a challenge,

Lifting parameters

Highest magnetic holding forcewhat it depends on?

Breakaway force is the result of a measurement for optimal configuration, taking into account:
  • with the application of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • possessing a thickness of min. 10 mm to avoid saturation
  • characterized by smoothness
  • without any air gap between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is affected by specific conditions, mainly (from most important):
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material composition – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
  • Base smoothness – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Temperature – heating the magnet causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was assessed with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

Warnings
Operating temperature

Do not overheat. NdFeB magnets are sensitive to heat. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).

Swallowing risk

Only for adults. Tiny parts can be swallowed, causing severe trauma. Keep away from children and animals.

Allergic reactions

Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, cease handling magnets and use protective gear.

Magnets are brittle

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Danger to pacemakers

Individuals with a heart stimulator should keep an safe separation from magnets. The magnetism can stop the functioning of the implant.

Impact on smartphones

A powerful magnetic field interferes with the operation of compasses in smartphones and GPS navigation. Maintain magnets close to a device to avoid damaging the sensors.

Hand protection

Watch your fingers. Two powerful magnets will snap together instantly with a force of massive weight, crushing everything in their path. Be careful!

Powerful field

Exercise caution. Neodymium magnets attract from a long distance and connect with massive power, often faster than you can move away.

Protect data

Device Safety: Strong magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).

Machining danger

Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Warning! Learn more about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98