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MPL 12.5x12.5x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020117

GTIN/EAN: 5906301811237

5.00
Load capacity 4.84 kg / 47.51 N Magnetic Induction 360.91 mT / 3609 Gs
length
12.5 mm [±0,1 mm]
Width
12.5 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
5.86 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Lifting power as well as form of magnetic components can be estimated using our power calculator.

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Technical - MPL 12.5x12.5x5 / N38 - lamellar magnet

Specification / characteristics - MPL 12.5x12.5x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020117
GTIN/EAN 5906301811237
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 12.5 mm [±0,1 mm]
Width 12.5 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 5.86 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.84 kg / 47.51 N
Magnetic Induction ~ ? 360.91 mT / 3609 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 12.5x12.5x5 / 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 analysis of the assembly - technical parameters

These data are the outcome of a physical calculation. Values were calculated on models for the material Nd2Fe14B. Real-world conditions may differ. Use these data as a reference point during assembly planning.

Table 1: Static force (force vs distance) - interaction chart
MPL 12.5x12.5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3608 Gs
360.8 mT
4.84 kg / 10.67 lbs
4840.0 g / 47.5 N
warning
1 mm 3156 Gs
315.6 mT
3.70 kg / 8.17 lbs
3704.2 g / 36.3 N
warning
2 mm 2671 Gs
267.1 mT
2.65 kg / 5.85 lbs
2653.8 g / 26.0 N
warning
3 mm 2211 Gs
221.1 mT
1.82 kg / 4.01 lbs
1817.7 g / 17.8 N
safe
5 mm 1464 Gs
146.4 mT
0.80 kg / 1.76 lbs
797.6 g / 7.8 N
safe
10 mm 538 Gs
53.8 mT
0.11 kg / 0.24 lbs
107.6 g / 1.1 N
safe
15 mm 234 Gs
23.4 mT
0.02 kg / 0.05 lbs
20.4 g / 0.2 N
safe
20 mm 119 Gs
11.9 mT
0.01 kg / 0.01 lbs
5.3 g / 0.1 N
safe
30 mm 42 Gs
4.2 mT
0.00 kg / 0.00 lbs
0.7 g / 0.0 N
safe
50 mm 10 Gs
1.0 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe

Table 2: Shear load (wall)
MPL 12.5x12.5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.97 kg / 2.13 lbs
968.0 g / 9.5 N
1 mm Stal (~0.2) 0.74 kg / 1.63 lbs
740.0 g / 7.3 N
2 mm Stal (~0.2) 0.53 kg / 1.17 lbs
530.0 g / 5.2 N
3 mm Stal (~0.2) 0.36 kg / 0.80 lbs
364.0 g / 3.6 N
5 mm Stal (~0.2) 0.16 kg / 0.35 lbs
160.0 g / 1.6 N
10 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 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: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 12.5x12.5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.45 kg / 3.20 lbs
1452.0 g / 14.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.97 kg / 2.13 lbs
968.0 g / 9.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.48 kg / 1.07 lbs
484.0 g / 4.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.42 kg / 5.34 lbs
2420.0 g / 23.7 N

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 12.5x12.5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.48 kg / 1.07 lbs
484.0 g / 4.7 N
1 mm
25%
1.21 kg / 2.67 lbs
1210.0 g / 11.9 N
2 mm
50%
2.42 kg / 5.34 lbs
2420.0 g / 23.7 N
3 mm
75%
3.63 kg / 8.00 lbs
3630.0 g / 35.6 N
5 mm
100%
4.84 kg / 10.67 lbs
4840.0 g / 47.5 N
10 mm
100%
4.84 kg / 10.67 lbs
4840.0 g / 47.5 N
11 mm
100%
4.84 kg / 10.67 lbs
4840.0 g / 47.5 N
12 mm
100%
4.84 kg / 10.67 lbs
4840.0 g / 47.5 N

Table 5: Thermal resistance (stability) - power drop
MPL 12.5x12.5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.84 kg / 10.67 lbs
4840.0 g / 47.5 N
OK
40 °C -2.2% 4.73 kg / 10.44 lbs
4733.5 g / 46.4 N
OK
60 °C -4.4% 4.63 kg / 10.20 lbs
4627.0 g / 45.4 N
80 °C -6.6% 4.52 kg / 9.97 lbs
4520.6 g / 44.3 N
100 °C -28.8% 3.45 kg / 7.60 lbs
3446.1 g / 33.8 N

Table 6: Two magnets (repulsion) - field collision
MPL 12.5x12.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 12.54 kg / 27.64 lbs
5 069 Gs
1.88 kg / 4.15 lbs
1880 g / 18.4 N
N/A
1 mm 11.08 kg / 24.43 lbs
6 783 Gs
1.66 kg / 3.66 lbs
1662 g / 16.3 N
9.97 kg / 21.98 lbs
~0 Gs
2 mm 9.59 kg / 21.15 lbs
6 312 Gs
1.44 kg / 3.17 lbs
1439 g / 14.1 N
8.63 kg / 19.04 lbs
~0 Gs
3 mm 8.18 kg / 18.03 lbs
5 827 Gs
1.23 kg / 2.70 lbs
1226 g / 12.0 N
7.36 kg / 16.22 lbs
~0 Gs
5 mm 5.71 kg / 12.60 lbs
4 871 Gs
0.86 kg / 1.89 lbs
857 g / 8.4 N
5.14 kg / 11.34 lbs
~0 Gs
10 mm 2.07 kg / 4.55 lbs
2 929 Gs
0.31 kg / 0.68 lbs
310 g / 3.0 N
1.86 kg / 4.10 lbs
~0 Gs
20 mm 0.28 kg / 0.61 lbs
1 076 Gs
0.04 kg / 0.09 lbs
42 g / 0.4 N
0.25 kg / 0.55 lbs
~0 Gs
50 mm 0.00 kg / 0.01 lbs
136 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
84 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
56 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
39 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
28 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
21 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) - precautionary measures
MPL 12.5x12.5x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Timepiece 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (kinetic energy) - collision effects
MPL 12.5x12.5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.51 km/h
(6.81 m/s)
0.14 J
30 mm 24.80 km/h
(6.89 m/s)
0.14 J
50 mm 24.80 km/h
(6.89 m/s)
0.14 J
100 mm 24.81 km/h
(6.89 m/s)
0.14 J

Table 9: Surface protection spec
MPL 12.5x12.5x5 / 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 12.5x12.5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 874 Mx 58.7 µWb
Pc Coefficient 0.46 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 12.5x12.5x5 / N38

Environment Effective steel pull Effect
Air (land) 4.84 kg Standard
Water (riverbed) 5.54 kg
(+0.70 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. Vertical hold

*Caution: On a vertical wall, the magnet retains just ~20% of its max power.

2. Steel thickness impact

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

3. Temperature resistance

*For standard magnets, the max working temp is 80°C.

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

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

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 and environmental data

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: 020117-2026
Measurement Calculator

Pulling force


Magnetic Field

Other offers

Model MPL 12.5x12.5x5 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. This magnetic block with a force of 47.51 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 4.84 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. 4.84 kg), they are ideal as hidden locks 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.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. 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.
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. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 12.5x12.5x5 mm, which, at a weight of 5.86 g, makes it an element with high energy density. The key parameter here is the holding force amounting to approximately 4.84 kg (force ~47.51 N), which, with such a compact shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of neodymium magnets.

Benefits

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their strength remains stable, and after approximately ten years it decreases only by ~1% (according to research),
  • They maintain their magnetic properties even under close interference source,
  • The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnets have exceptionally strong magnetic induction on the surface,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Considering the ability of flexible shaping and customization to custom needs, NdFeB magnets can be produced in a variety of forms and dimensions, which increases their versatility,
  • Huge importance in high-tech industry – they are used in computer drives, drive modules, medical equipment, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in miniature devices

Limitations

What to avoid - cons of neodymium magnets and ways of using them
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • We recommend a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to complicate diagnosis medical when they are in the body.
  • Due to complex production process, their price exceeds standard values,

Lifting parameters

Best holding force of the magnet in ideal parameterswhat contributes to it?

The lifting capacity listed is a result of laboratory testing executed under standard conditions:
  • on a plate made of mild steel, perfectly concentrating the magnetic field
  • with a cross-section no less than 10 mm
  • characterized by lack of roughness
  • under conditions of ideal adhesion (surface-to-surface)
  • during detachment in a direction perpendicular to the plane
  • at temperature room level

Lifting capacity in practice – influencing factors

During everyday use, the actual holding force is determined by many variables, presented from crucial:
  • Gap (between the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • 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.
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Metal type – not every steel attracts identically. High carbon content weaken the attraction effect.
  • Surface finish – ideal contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Protect data

Data protection: Strong magnets can damage payment cards and sensitive devices (heart implants, medical aids, timepieces).

Fragile material

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Conscious usage

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

Do not drill into magnets

Powder created during grinding of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

Nickel allergy

A percentage of the population have a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Extended handling can result in an allergic reaction. We recommend wear protective gloves.

Bone fractures

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

GPS Danger

A powerful magnetic field negatively affects the functioning of magnetometers in phones and GPS navigation. Keep magnets close to a device to avoid breaking the sensors.

Maximum temperature

Monitor thermal conditions. Heating the magnet to high heat will destroy its properties and pulling force.

Swallowing risk

Product intended for adults. Tiny parts pose a choking risk, leading to severe trauma. Keep out of reach of kids and pets.

Danger to pacemakers

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

Caution! Learn more about hazards in the article: Safety of working with magnets.