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MPL 25x2x6 / N38 - lamellar magnet

lamellar magnet

Catalog no 020509

Load capacity 2.33 kg / 22.82 N Magnetic Induction 558.90 mT / 5589 Gs
length
25 mm [±0,1 mm]
Width
2 mm [±0,1 mm]
Height
6 mm [±0,1 mm]
Weight
2.25 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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Product card - MPL 25x2x6 / N38 - lamellar magnet

Specification / characteristics - MPL 25x2x6 / N38 - lamellar magnet

properties
properties values
Cat. no. 020509
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 25 mm [±0,1 mm]
Width 2 mm [±0,1 mm]
Height 6 mm [±0,1 mm]
Weight 2.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.33 kg / 22.82 N
Magnetic Induction ~ ? 558.90 mT / 5589 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 25x2x6 / 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 - data

Presented data represent the direct effect of a physical simulation. Results were calculated on models for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Use these data as a reference point for designers.

Table 1: Static force (force vs distance) - interaction chart
MPL 25x2x6 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5574 Gs
557.4 mT
 2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
 medium risk
1 mm 2599 Gs
259.9 mT
 0.51 kg / 1.12 lbs
506.6 g / 5.0 N
 weak grip
2 mm 1392 Gs
139.2 mT
 0.15 kg / 0.32 lbs
145.3 g / 1.4 N
 weak grip
3 mm 879 Gs
87.9 mT
 0.06 kg / 0.13 lbs
58.0 g / 0.6 N
 weak grip
5 mm 454 Gs
45.4 mT
 0.02 kg / 0.03 lbs
15.5 g / 0.2 N
 weak grip
10 mm 155 Gs
15.5 mT
 0.00 kg / 0.00 lbs
1.8 g / 0.0 N
 weak grip
15 mm 72 Gs
7.2 mT
 0.00 kg / 0.00 lbs
0.4 g / 0.0 N
 weak grip
20 mm 39 Gs
3.9 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
30 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Grip strength weakens significantly with every subsequent millimeter of spacing. Note that even a microscopic distance (e.g., contamination, paint, dust) strongly weakens the grip. Magnets work most effectively in perfect adhesion; distance weakens the power. See how flashily the parameters fall, when the magnet does not adhere directly to the steel surface. When designing the mounting, eliminate redundant distances.

Table 2: Shear force (wall)
MPL 25x2x6 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.47 kg / 1.03 lbs
466.0 g / 4.6 N
1 mm Stal (~0.2) 0.10 kg / 0.22 lbs
102.0 g / 1.0 N
2 mm Stal (~0.2) 0.03 kg / 0.07 lbs
30.0 g / 0.3 N
3 mm Stal (~0.2) 0.01 kg / 0.03 lbs
12.0 g / 0.1 N
5 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 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
The following data shows the estimated weight limit needed to start the downward movement of the magnet vertically against a vertical metal surface (considering typical friction). This parameter depends on the distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 25x2x6 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.70 kg / 1.54 lbs
699.0 g / 6.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.47 kg / 1.03 lbs
466.0 g / 4.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.23 kg / 0.51 lbs
233.0 g / 2.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.17 kg / 2.57 lbs
1165.0 g / 11.4 N
When mounting a magnet on a upright plane (e.g., a fridge), it will only hold just about 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that magnets slide down easier than they detach. Want to create a hanger? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the element will give way down under a noticeably lighter cargo. Application of an anti-slip coating can effectively improve the result.

Table 4: Material efficiency (saturation) - power losses
MPL 25x2x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.23 kg / 0.51 lbs
233.0 g / 2.3 N
1 mm
25%
 0.58 kg / 1.28 lbs
582.5 g / 5.7 N
2 mm
50%
 1.17 kg / 2.57 lbs
1165.0 g / 11.4 N
3 mm
75%
 1.75 kg / 3.85 lbs
1747.5 g / 17.1 N
5 mm
100%
 2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
10 mm
100%
 2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
11 mm
100%
 2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
12 mm
100%
 2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
A thin sheet cannot focus the entire magnetic field, which squanders power of the magnet. If you install a neodymium to a weak sheet, the magnetism will pass right through and the attraction force will be weaker. To squeeze the maximum of this magnet's power, you need a suitably thick element of metal. The saturation effect causes that on delicate walls (e.g., thin profiles), the magnet holds weaker. We advise picking the steel thickness according to the table below.

Table 5: Thermal resistance (stability) - thermal limit
MPL 25x2x6 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
 OK
40 °C -2.2% 2.28 kg / 5.02 lbs
2278.7 g / 22.4 N
 OK
60 °C -4.4% 2.23 kg / 4.91 lbs
2227.5 g / 21.9 N
 OK
80 °C -6.6% 2.18 kg / 4.80 lbs
2176.2 g / 21.3 N
100 °C -28.8% 1.66 kg / 3.66 lbs
1659.0 g / 16.3 N
Classic neodymiums lose power after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly demagnetize this magnet. With increasing heat, the magnet's power temporarily decreases. Avoid using this product close to heaters higher than its working range. Exceeding the critical threshold will lead to destruction of magnetic properties.
*Important note: Heat tolerance is determined by both grade, but also on the magnet's shape. Low-profile magnets (low Pc) risk losing magnetic properties at lower temperatures compared to rod magnets. Red status in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field range
MPL 25x2x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.58 kg / 21.12 lbs
5 924 Gs
1.44 kg / 3.17 lbs
1437 g / 14.1 N
 N/A
1 mm 4.52 kg / 9.97 lbs
7 659 Gs
0.68 kg / 1.49 lbs
678 g / 6.7 N
 4.07 kg / 8.97 lbs
~0 Gs
2 mm 2.08 kg / 4.59 lbs
5 198 Gs
0.31 kg / 0.69 lbs
312 g / 3.1 N
 1.87 kg / 4.13 lbs
~0 Gs
3 mm 1.06 kg / 2.34 lbs
3 708 Gs
0.16 kg / 0.35 lbs
159 g / 1.6 N
 0.95 kg / 2.10 lbs
~0 Gs
5 mm 0.37 kg / 0.81 lbs
2 179 Gs
0.05 kg / 0.12 lbs
55 g / 0.5 N
 0.33 kg / 0.73 lbs
~0 Gs
10 mm 0.06 kg / 0.14 lbs
909 Gs
0.01 kg / 0.02 lbs
10 g / 0.1 N
 0.06 kg / 0.13 lbs
~0 Gs
20 mm 0.01 kg / 0.02 lbs
311 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
46 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
29 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
20 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
14 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
10 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
8 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnetic products attract each other from a significantly greater distance than a neodymium and metal setup. Such a system of two magnets creates a more powerful interaction and a larger range of performance. Designing a powerful holder? Apply two magnets instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the collision energy is massive. The levitation is marginally weaker than the attraction, but still significant.
*Field value between like poles drops to ~0 Gs in the exact middle of the gap (due to field cancellation).
Important: Results apply to friction force of two matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - precautionary measures
MPL 25x2x6 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 3.5 cm
Timepiece 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.0 cm
Remote 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm
Powerful magnet radiation is a real danger to electronic devices and pacemakers. These neodymiums generate a flux that destroys function of digital equipment. Remember: the unseen radiation penetrates the body and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
MPL 25x2x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 13.77 km/h
(3.83 m/s)
 0.02 J
30 mm 13.80 km/h
(3.83 m/s)
 0.02 J
50 mm 13.80 km/h
(3.83 m/s)
 0.02 J
100 mm 13.80 km/h
(3.83 m/s)
 0.02 J
NdFeB products are prone to chipping – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Impact energy can trigger coating fragments or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Anti-corrosion coating durability
MPL 25x2x6 / 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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MPL 25x2x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 608 Mx 26.1 µWb
Pc Coefficient 0.76 High (Stable)
Total magnetic flux emitted by the pole surface. Essential parameter when building generators and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Physics of underwater searching
MPL 25x2x6 / N38

Environment Effective steel pull Effect
Air (land) 2.33 kg Standard
Water (riverbed) 2.67 kg
(+0.34 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Wall mount (shear)

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

2. Steel saturation

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

3. Thermal stability

*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) = 0.76

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

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%

Sustainability

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: 020509-2026
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Model MPL 25x2x6 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. As a block magnet with high power (approx. 2.33 kg), this product is available off-the-shelf from our warehouse in Poland. 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 2.33 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. 2.33 kg), they are ideal as closers in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 25x2x6 / N38, it is best to use two-component adhesives (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.
Standardly, the MPL 25x2x6 / N38 model is magnetized through the thickness (dimension 6 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (25x2 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 25x2x6 mm, which, at a weight of 2.25 g, makes it an element with high energy density. It is a magnetic block with dimensions 25x2x6 mm and a self-weight of 2.25 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of Nd2Fe14B magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:
  • They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • Magnets very well protect themselves against loss of magnetization caused by foreign field sources,
  • Thanks to the shimmering finish, the surface of nickel, gold-plated, or silver-plated gives an clean appearance,
  • Magnetic induction on the working layer of the magnet turns out to be maximum,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Due to the possibility of flexible forming and customization to individualized solutions, neodymium magnets can be manufactured in a broad palette of geometric configurations, which expands the range of possible applications,
  • Huge importance in innovative solutions – they find application in mass storage devices, electric motors, diagnostic systems, also complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves 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
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • We recommend cover - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products can be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Detachment force of the magnet in optimal conditions – what contributes to it?

The declared magnet strength refers to the limit force, recorded under optimal environment, namely:
  • on a block made of mild steel, effectively closing the magnetic flux
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with a surface perfectly flat
  • without the slightest air gap between the magnet and steel
  • under vertical force vector (90-degree angle)
  • in stable room temperature

Practical aspects of lifting capacity – factors

Please note that the application force will differ subject to elements below, starting with the most relevant:
  • Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Material composition – different alloys attracts identically. Alloy additives weaken the attraction effect.
  • Plate texture – ground elements guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Thermal factor – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet’s surface and the plate decreases the holding force.

Precautions when working with NdFeB magnets
Keep away from electronics

GPS units and mobile phones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Heat sensitivity

Standard neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.

Risk of cracking

Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Health Danger

Life threat: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Bodily injuries

Pinching hazard: The pulling power is so great that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Do not underestimate power

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

Do not give to children

NdFeB magnets are not toys. Swallowing a few magnets may result in them attracting across intestines, which constitutes a severe health hazard and requires urgent medical intervention.

Dust explosion hazard

Powder produced during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Avoid contact if allergic

Studies show that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, prevent touching magnets with bare hands or opt for coated magnets.

Keep away from computers

Equipment safety: Strong magnets can damage payment cards and delicate electronics (heart implants, hearing aids, timepieces).

Caution! More info about hazards in the article: Magnet Safety Guide.