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MPL 12.5x12.5x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020117

GTIN/EAN: 5906301811237

5.00

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

view properties »

2.83 ZŁ with VAT / pcs + price for transport

2.30 ZŁ net + 23% VAT / pcs

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Technical details - 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

Engineering analysis of the product - report

The following values represent the direct effect of a mathematical simulation. Results rely on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ. Treat these calculations as a reference point for designers.

Table 1: Static force (pull vs gap) - power drop
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 pounds
4840.0 g / 47.5 N
 warning
1 mm 3156 Gs
315.6 mT
 3.70 kg / 8.17 pounds
3704.2 g / 36.3 N
 warning
2 mm 2671 Gs
267.1 mT
 2.65 kg / 5.85 pounds
2653.8 g / 26.0 N
 warning
3 mm 2211 Gs
221.1 mT
 1.82 kg / 4.01 pounds
1817.7 g / 17.8 N
 safe
5 mm 1464 Gs
146.4 mT
 0.80 kg / 1.76 pounds
797.6 g / 7.8 N
 safe
10 mm 538 Gs
53.8 mT
 0.11 kg / 0.24 pounds
107.6 g / 1.1 N
 safe
15 mm 234 Gs
23.4 mT
 0.02 kg / 0.05 pounds
20.4 g / 0.2 N
 safe
20 mm 119 Gs
11.9 mT
 0.01 kg / 0.01 pounds
5.3 g / 0.1 N
 safe
30 mm 42 Gs
4.2 mT
 0.00 kg / 0.00 pounds
0.7 g / 0.0 N
 safe
50 mm 10 Gs
1.0 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
Magnetic force decreases sharply with every mm of distance. Note that even a microscopic distance (e.g., contamination, paint, veneer) noticeably weakens the grip. Magnetic products work most effectively at the point of direct contact; distance drastically cuts the power. See how rapidly the pull force plummet, when the product does not adhere tightly to the metal substrate. When calculating the arrangement, eliminate redundant distances.

Table 2: Shear capacity (vertical surface)
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 pounds
968.0 g / 9.5 N
1 mm Stal (~0.2) 0.74 kg / 1.63 pounds
740.0 g / 7.3 N
2 mm Stal (~0.2) 0.53 kg / 1.17 pounds
530.0 g / 5.2 N
3 mm Stal (~0.2) 0.36 kg / 0.80 pounds
364.0 g / 3.6 N
5 mm Stal (~0.2) 0.16 kg / 0.35 pounds
160.0 g / 1.6 N
10 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below shows the theoretical weight limit needed to cause the shifting of the magnet vertically along a vertical metal surface (assuming standard friction coefficient). This value varies with the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
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 pounds
1452.0 g / 14.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.97 kg / 2.13 pounds
968.0 g / 9.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.48 kg / 1.07 pounds
484.0 g / 4.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.42 kg / 5.34 pounds
2420.0 g / 23.7 N
When mounting a element on a upright wall (e.g., a board), it will maintain barely approx. 1/5 of its maximum pull force. Gravity and a weak degree of grip mean that magnets slide down easier than they detach. Want to create a vertical fastening? Note that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the holder will slip down under a much lighter weight. Utilizing a rubberized layer can effectively improve the result.

Table 4: Steel thickness (saturation) - 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 pounds
484.0 g / 4.7 N
1 mm
25%
 1.21 kg / 2.67 pounds
1210.0 g / 11.9 N
2 mm
50%
 2.42 kg / 5.34 pounds
2420.0 g / 23.7 N
3 mm
75%
 3.63 kg / 8.00 pounds
3630.0 g / 35.6 N
5 mm
100%
 4.84 kg / 10.67 pounds
4840.0 g / 47.5 N
10 mm
100%
 4.84 kg / 10.67 pounds
4840.0 g / 47.5 N
11 mm
100%
 4.84 kg / 10.67 pounds
4840.0 g / 47.5 N
12 mm
100%
 4.84 kg / 10.67 pounds
4840.0 g / 47.5 N
A thin sheet is unable to focus the entire magnetic field, which wastes potential of the magnet. If you install a neodymium to a thin surface, the field will penetrate right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's power, you need a suitably thick element of metal. The material oversaturation causes that on thin elements (e.g., thin profiles), the holder holds weaker. We suggest choosing the steel thickness based on the following data.

Table 5: Working in heat (stability) - 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 pounds
4840.0 g / 47.5 N
 OK
40 °C -2.2% 4.73 kg / 10.44 pounds
4733.5 g / 46.4 N
 OK
60 °C -4.4% 4.63 kg / 10.20 pounds
4627.0 g / 45.4 N
80 °C -6.6% 4.52 kg / 9.97 pounds
4520.6 g / 44.3 N
100 °C -28.8% 3.45 kg / 7.60 pounds
3446.1 g / 33.8 N
Standard neodymium magnets lose strength after exceeding the maximum temperature. Watch out for overheating – high temperature can irreversibly destroy this product. With every degree above norm, the magnet's force briefly decreases. Refrain from using this product in hot environments higher than its operating temperature limit. Too high temperature will lead to destruction of magnetism.
*Technical advisory: Thermal stability is determined by both grade, as well as the dimension ratios. Low-profile magnets (low Pc) risk losing magnetic properties at lower temperatures than taller cylinders. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MPL 12.5x12.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 12.54 kg / 27.64 pounds
5 069 Gs
1.88 kg / 4.15 pounds
1880 g / 18.4 N
 N/A
1 mm 11.08 kg / 24.43 pounds
6 783 Gs
1.66 kg / 3.66 pounds
1662 g / 16.3 N
 9.97 kg / 21.98 pounds
~0 Gs
2 mm 9.59 kg / 21.15 pounds
6 312 Gs
1.44 kg / 3.17 pounds
1439 g / 14.1 N
 8.63 kg / 19.04 pounds
~0 Gs
3 mm 8.18 kg / 18.03 pounds
5 827 Gs
1.23 kg / 2.70 pounds
1226 g / 12.0 N
 7.36 kg / 16.22 pounds
~0 Gs
5 mm 5.71 kg / 12.60 pounds
4 871 Gs
0.86 kg / 1.89 pounds
857 g / 8.4 N
 5.14 kg / 11.34 pounds
~0 Gs
10 mm 2.07 kg / 4.55 pounds
2 929 Gs
0.31 kg / 0.68 pounds
310 g / 3.0 N
 1.86 kg / 4.10 pounds
~0 Gs
20 mm 0.28 kg / 0.61 pounds
1 076 Gs
0.04 kg / 0.09 pounds
42 g / 0.4 N
 0.25 kg / 0.55 pounds
~0 Gs
50 mm 0.00 kg / 0.01 pounds
136 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
84 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
56 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
39 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
28 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
21 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets interact from a much further distance than a magnet and steel combination. The connection of two magnets generates a stronger field and a wider radius of operation. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Remember that when bringing together two magnets, the pinch force is massive. The repulsion force is slightly lower than the connection force, but still large.
*Field value between like poles reaches ~0 Gs in the exact middle of the gap (resulting from vector opposition).
* Calculations apply to sliding force of two identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - 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
Powerful magnet radiation is a serious hazard to electronic devices as well as pacemakers. These NdFeB products generate a field that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field passes through tissues and plastic. Special caution must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MPL 12.5x12.5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 29.38 km/h
(8.16 m/s)
 0.20 J
30 mm 50.21 km/h
(13.95 m/s)
 0.57 J
50 mm 64.81 km/h
(18.00 m/s)
 0.95 J
100 mm 91.65 km/h
(25.46 m/s)
 1.90 J
NdFeB products are prone to chipping – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely speeds with massive force. Striking energy can cause material chips or dangerous crushing to skin. Be sure to control the product during bringing near metal so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when working with large magnets.

Table 9: Corrosion resistance
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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Construction 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)
Total magnetic flux passing through the magnet pole. Key data when building generators as well as sensors. Pc value defines the magnet's operating point.

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.
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Heat tolerance

*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 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%
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
Magnet Unit Converter
Force (pull)
Field Strength
Input data in one of the inputs, and the rest will update in real-time.

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Component MPL 12.5x12.5x5 / N38 features a flat shape and industrial pulling force, making it an ideal solution for building separators and machines. As a magnetic bar with high power (approx. 4.84 kg), this product is available off-the-shelf from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 12.5x12.5x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. 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. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 12.5x12.5x5 / N38 model is magnetized axially (dimension 5 mm), which means that the N and S poles are located on its largest, flat surfaces. 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.
This model is characterized by dimensions 12.5x12.5x5 mm, which, at a weight of 5.86 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 4.84 kg (force ~47.51 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of rare earth magnets.

Strengths

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • They do not lose strength, even during approximately 10 years – the drop in lifting capacity is only ~1% (theoretically),
  • They maintain their magnetic properties even under close interference source,
  • By using a lustrous layer of silver, the element gains an proper look,
  • Magnetic induction on the top side of the magnet is impressive,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • Thanks to freedom in designing and the capacity to adapt to specific needs,
  • Huge importance in advanced technology sectors – they serve a role in magnetic memories, motor assemblies, diagnostic systems, also industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as 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.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Due to limitations in realizing nuts and complicated shapes in magnets, we propose using cover - magnetic mount.
  • Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these products can be problematic in diagnostics medical when they are in the body.
  • Due to neodymium price, their price exceeds standard values,

Holding force characteristics

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

The lifting capacity listed is a result of laboratory testing conducted under standard conditions:
  • with the use of a sheet made of special test steel, guaranteeing full magnetic saturation
  • whose thickness reaches at least 10 mm
  • with an ideally smooth contact surface
  • without the slightest insulating layer between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • at standard ambient temperature

Magnet lifting force in use – key factors

In real-world applications, the real power is determined by a number of factors, listed from the most important:
  • Space between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Material composition – not every steel reacts the same. High carbon content worsen the interaction with the magnet.
  • Smoothness – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was assessed with the use of a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the holding force is lower. Moreover, even a small distance between the magnet and the plate decreases the lifting capacity.

Precautions when working with neodymium magnets
Respect the power

Handle magnets with awareness. Their immense force can shock even experienced users. Stay alert and do not underestimate their power.

Beware of splinters

Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Cards and drives

Equipment safety: Neodymium magnets can damage payment cards and delicate electronics (heart implants, medical aids, mechanical watches).

Hand protection

Pinching hazard: The attraction force is so immense that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Fire risk

Fire hazard: Neodymium dust is explosive. Avoid machining magnets without safety gear as this risks ignition.

Health Danger

Warning for patients: Powerful magnets disrupt medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Compass and GPS

GPS units and smartphones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Avoid contact if allergic

A percentage of the population experience a hypersensitivity to nickel, which is the common plating for neodymium magnets. Extended handling might lead to dermatitis. It is best to wear safety gloves.

This is not a toy

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

Do not overheat magnets

Avoid heat. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Attention! Looking for details? Read our article: Are neodymium magnets dangerous?