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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

How we measure these parameters — certificates and measurements

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price from 1 pcs
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price from 300 pcs
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price from 1100 pcs
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Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

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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Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet 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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 simulation of the assembly - report

Presented values are the direct effect of a mathematical simulation. Values were calculated on algorithms for the material Nd2Fe14B. Operational performance may differ from theoretical values. Treat these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - characteristics
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
medium risk
1 mm 3156 Gs
315.6 mT
3.70 kg / 8.17 LBS
3704.2 g / 36.3 N
medium risk
2 mm 2671 Gs
267.1 mT
2.65 kg / 5.85 LBS
2653.8 g / 26.0 N
medium risk
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: Sliding force (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 (shearing) - 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: Material efficiency (substrate influence) - power losses
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 (material behavior) - resistance threshold
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: Magnet-Magnet interaction (attraction) - forces in the system
MPL 12.5x12.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (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: Hazards (implants) - warnings
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
Mechanical watch 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: Dynamics (cracking risk) - warning
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: Electrical data (Flux)
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: Submerged application
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

1. Shear force

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

2. Steel thickness impact

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

3. Temperature resistance

*For N38 grade, the critical limit is 80°C.

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

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

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 specification and ecology

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%

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: 020117-2026
Magnet Unit Converter

Pulling force


Field Strength

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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 12.5x12.5x5 mm and a weight of 5.86 g, guarantees premium class connection. As a block magnet with high power (approx. 4.84 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 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.
Plate magnets MPL 12.5x12.5x5 / 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. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
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. 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: 12.5 mm (length), 12.5 mm (width), and 5 mm (thickness). It is a magnetic block with dimensions 12.5x12.5x5 mm and a self-weight of 5.86 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 rare earth magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
  • They are noted for resistance to demagnetization induced by external disturbances,
  • The use of an refined layer of noble metals (nickel, gold, silver) causes the element to look better,
  • The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of individual creating and adapting to individual conditions,
  • Wide application in innovative solutions – they find application in mass storage devices, motor assemblies, medical equipment, and modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as 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
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Limited ability of making threads in the magnet and complicated shapes - preferred is a housing - magnet mounting.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these magnets are able to disrupt the diagnostic process medical after entering the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Holding force characteristics

Maximum holding power of the magnet – what it depends on?

Holding force of 4.84 kg is a theoretical maximum value executed under standard conditions:
  • on a base made of structural steel, effectively closing the magnetic flux
  • with a thickness minimum 10 mm
  • with an polished touching surface
  • without the slightest air gap between the magnet and steel
  • under perpendicular application of breakaway force (90-degree angle)
  • at standard ambient temperature

Lifting capacity in practice – influencing factors

Real force impacted by working environment parameters, such as (from priority):
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Chemical composition of the base – mild steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
  • Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Precautions when working with neodymium magnets
Crushing force

Large magnets can break fingers in a fraction of a second. Never put your hand betwixt two strong magnets.

Nickel allergy

Certain individuals experience a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Frequent touching can result in dermatitis. We recommend wear safety gloves.

Fire warning

Dust generated during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Eye protection

Neodymium magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets leads to them breaking into small pieces.

Phone sensors

Note: neodymium magnets generate a field that disrupts precision electronics. Keep a safe distance from your mobile, device, and navigation systems.

Handling guide

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

Maximum temperature

Standard neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.

Do not give to children

NdFeB magnets are not suitable for play. Accidental ingestion of a few magnets may result in them connecting inside the digestive tract, which poses a direct threat to life and requires immediate surgery.

Medical interference

Individuals with a heart stimulator should keep an large gap from magnets. The magnetism can stop the functioning of the life-saving device.

Protect data

Do not bring magnets close to a purse, computer, or screen. The magnetism can destroy these devices and wipe information from cards.

Safety First! Want to know more? Read our article: Why are neodymium magnets dangerous?