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MPL 40x15x6 / N38 - lamellar magnet

lamellar magnet

Catalog no 020155

GTIN/EAN: 5906301811619

5.00

length

40 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

6 mm [±0,1 mm]

Weight

27 g

Magnetization Direction

↑ axial

Load capacity

14.21 kg / 139.45 N

Magnetic Induction

286.36 mT / 2864 Gs

Coating

[NiCuNi] Nickel

product specifications »

18.45 ZŁ with VAT / pcs + price for transport

15.00 ZŁ net + 23% VAT / pcs

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Product card - MPL 40x15x6 / N38 - lamellar magnet

Specification / characteristics - MPL 40x15x6 / N38 - lamellar magnet

properties
properties values
Cat. no. 020155
GTIN/EAN 5906301811619
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 40 mm [±0,1 mm]
Width 15 mm [±0,1 mm]
Height 6 mm [±0,1 mm]
Weight 27 g
Magnetization Direction ↑ axial
Load capacity ~ ? 14.21 kg / 139.45 N
Magnetic Induction ~ ? 286.36 mT / 2864 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x15x6 / 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 simulation of the product - technical parameters

The following data constitute the direct effect of a physical simulation. Results rely on algorithms for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Treat these calculations as a reference point when designing systems.

Table 1: Static pull force (force vs distance) - power drop
MPL 40x15x6 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2863 Gs
286.3 mT
 14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
 crushing
1 mm 2635 Gs
263.5 mT
 12.04 kg / 26.55 lbs
12041.8 g / 118.1 N
 crushing
2 mm 2385 Gs
238.5 mT
 9.86 kg / 21.74 lbs
9859.1 g / 96.7 N
 strong
3 mm 2132 Gs
213.2 mT
 7.88 kg / 17.37 lbs
7880.1 g / 77.3 N
 strong
5 mm 1670 Gs
167.0 mT
 4.84 kg / 10.66 lbs
4837.1 g / 47.5 N
 strong
10 mm 903 Gs
90.3 mT
 1.41 kg / 3.11 lbs
1412.2 g / 13.9 N
 low risk
15 mm 520 Gs
52.0 mT
 0.47 kg / 1.03 lbs
469.2 g / 4.6 N
 low risk
20 mm 320 Gs
32.0 mT
 0.18 kg / 0.39 lbs
177.7 g / 1.7 N
 low risk
30 mm 141 Gs
14.1 mT
 0.03 kg / 0.08 lbs
34.5 g / 0.3 N
 low risk
50 mm 41 Gs
4.1 mT
 0.00 kg / 0.01 lbs
3.0 g / 0.0 N
 low risk
Pulling power decreases significantly per each millimeter of spacing. Keep in mind that every additional insulation layer (e.g., contamination, varnish, dust) noticeably weakens the grip. Magnetic products operate strongest during direct contact; gap weakens the power. Analyze how flashily the parameters fall, when the magnet does not adhere tightly to the metal substrate. When calculating the arrangement, discard unnecessary gaps.

Table 2: Slippage capacity (wall)
MPL 40x15x6 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.84 kg / 6.27 lbs
2842.0 g / 27.9 N
1 mm Stal (~0.2) 2.41 kg / 5.31 lbs
2408.0 g / 23.6 N
2 mm Stal (~0.2) 1.97 kg / 4.35 lbs
1972.0 g / 19.3 N
3 mm Stal (~0.2) 1.58 kg / 3.47 lbs
1576.0 g / 15.5 N
5 mm Stal (~0.2) 0.97 kg / 2.13 lbs
968.0 g / 9.5 N
10 mm Stal (~0.2) 0.28 kg / 0.62 lbs
282.0 g / 2.8 N
15 mm Stal (~0.2) 0.09 kg / 0.21 lbs
94.0 g / 0.9 N
20 mm Stal (~0.2) 0.04 kg / 0.08 lbs
36.0 g / 0.4 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
The table below shows the theoretical holding capacity necessary to cause the downward movement of the magnet downwards against a upright steel wall (considering standard friction). The holding force is a function of the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 40x15x6 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.26 kg / 9.40 lbs
4263.0 g / 41.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.84 kg / 6.27 lbs
2842.0 g / 27.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.42 kg / 3.13 lbs
1421.0 g / 13.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.11 kg / 15.66 lbs
7105.0 g / 69.7 N
When placing a element on a upright plane (e.g., a fridge), it will maintain just about 20%-30% of its nominal power. Gravity and a weak degree of grip mean that holders slide down faster than they pull off. Want to create a wall mount? Note that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the holder will slide down under a significantly smaller load. Application of an anti-slip coating can effectively improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MPL 40x15x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.71 kg / 1.57 lbs
710.5 g / 7.0 N
1 mm
13%
 1.78 kg / 3.92 lbs
1776.3 g / 17.4 N
2 mm
25%
 3.55 kg / 7.83 lbs
3552.5 g / 34.9 N
3 mm
38%
 5.33 kg / 11.75 lbs
5328.8 g / 52.3 N
5 mm
63%
 8.88 kg / 19.58 lbs
8881.3 g / 87.1 N
10 mm
100%
 14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
11 mm
100%
 14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
12 mm
100%
 14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
A too thin steel is not enough to focus the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a thin surface, the flux will penetrate right through and the pull force will drop sharply. To utilize full efficiency of this magnet's power, you need a suitably thick backing of steel. The saturation phenomenon causes that on delicate walls (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel cross-section according to the table below.

Table 5: Working in heat (material behavior) - power drop
MPL 40x15x6 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
 OK
40 °C -2.2% 13.90 kg / 30.64 lbs
13897.4 g / 136.3 N
 OK
60 °C -4.4% 13.58 kg / 29.95 lbs
13584.8 g / 133.3 N
80 °C -6.6% 13.27 kg / 29.26 lbs
13272.1 g / 130.2 N
100 °C -28.8% 10.12 kg / 22.31 lbs
10117.5 g / 99.3 N
Ordinary NdFeB products change their properties power after exceeding the maximum temperature. Avoid high temperatures – excessive heat can permanently destroy this magnet. As the temperature rises, the magnet's force temporarily decreases. Do not use this product in hot environments exceeding its operating temperature limit. Ignoring the limit will result in irreversible degradation of magnetism.
*Engineering note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) may lose charge permanently 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 40x15x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 30.32 kg / 66.84 lbs
4 334 Gs
4.55 kg / 10.03 lbs
4547 g / 44.6 N
 N/A
1 mm 28.06 kg / 61.86 lbs
5 508 Gs
4.21 kg / 9.28 lbs
4209 g / 41.3 N
 25.25 kg / 55.67 lbs
~0 Gs
2 mm 25.69 kg / 56.64 lbs
5 271 Gs
3.85 kg / 8.50 lbs
3854 g / 37.8 N
 23.12 kg / 50.97 lbs
~0 Gs
3 mm 23.33 kg / 51.43 lbs
5 023 Gs
3.50 kg / 7.71 lbs
3499 g / 34.3 N
 21.00 kg / 46.29 lbs
~0 Gs
5 mm 18.85 kg / 41.56 lbs
4 515 Gs
2.83 kg / 6.23 lbs
2828 g / 27.7 N
 16.97 kg / 37.40 lbs
~0 Gs
10 mm 10.32 kg / 22.75 lbs
3 341 Gs
1.55 kg / 3.41 lbs
1548 g / 15.2 N
 9.29 kg / 20.48 lbs
~0 Gs
20 mm 3.01 kg / 6.64 lbs
1 805 Gs
0.45 kg / 1.00 lbs
452 g / 4.4 N
 2.71 kg / 5.98 lbs
~0 Gs
50 mm 0.16 kg / 0.35 lbs
416 Gs
0.02 kg / 0.05 lbs
24 g / 0.2 N
 0.14 kg / 0.32 lbs
~0 Gs
60 mm 0.07 kg / 0.16 lbs
282 Gs
0.01 kg / 0.02 lbs
11 g / 0.1 N
 0.07 kg / 0.15 lbs
~0 Gs
70 mm 0.04 kg / 0.08 lbs
199 Gs
0.01 kg / 0.01 lbs
5 g / 0.1 N
 0.03 kg / 0.07 lbs
~0 Gs
80 mm 0.02 kg / 0.04 lbs
144 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 / 0.02 lbs
108 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 / 0.01 lbs
83 Gs
0.00 kg / 0.00 lbs
1 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 magnet-to-magnet creates a more powerful interaction and a larger range of performance. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Remember that when attracting two neodymiums, the collision energy is extreme. The repulsion force is slightly lower than the attraction, but still impressive.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
Note: Figures show sliding force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - precautionary measures
MPL 40x15x6 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.0 cm
Hearing aid 10 Gs (1.0 mT) 8.5 cm
Mechanical watch 20 Gs (2.0 mT) 7.0 cm
Mobile device 40 Gs (4.0 mT) 5.5 cm
Car key 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Powerful magnet radiation poses a large risk to IT equipment and medical implants. These NdFeB products produce a field that destroys function of digital equipment. Notice: the invisible magnetic field penetrates the body and plastic. Exceptional care must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MPL 40x15x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.53 km/h
(6.81 m/s)
 0.63 J
30 mm 40.13 km/h
(11.15 m/s)
 1.68 J
50 mm 51.74 km/h
(14.37 m/s)
 2.79 J
100 mm 73.16 km/h
(20.32 m/s)
 5.58 J
Neodymium magnets are delicate – a collision with steel can result in shattering. Watch the impact speed – a neodymium left loose turns into a projectile. Impact energy can cause material chips or painful pinches to fingers. Be sure to control the product during bringing near metal so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 40x15x6 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MPL 40x15x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 905 Mx 169.0 µWb
Pc Coefficient 0.31 Low (Flat)
Flux value passing through the magnet pole. Essential parameter for generator designers and motors. Pc value defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 40x15x6 / N38

Environment Effective steel pull Effect
Air (land) 14.21 kg Standard
Water (riverbed) 16.27 kg
(+2.06 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!
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

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

2. Steel saturation

*Thin metal sheet (e.g. computer case) severely weakens 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) = 0.31

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.

Engineering data and GPSR
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%
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: 020155-2026
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Model MPL 40x15x6 / N38 features a flat shape and industrial pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 14.21 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 sliding 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. To separate the MPL 40x15x6 / 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 generators and material handling systems. They work great as invisible mounts under tiles, wood, or glass. Customers often choose this model for workshop organization 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. 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 (40x15 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 40x15x6 mm, which, at a weight of 27 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 14.21 kg (force ~139.45 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of neodymium magnets.

Strengths

Besides their exceptional pulling force, neodymium magnets offer the following advantages:
  • Their strength remains stable, and after approximately ten years it drops only by ~1% (according to research),
  • They feature excellent resistance to magnetism drop due to opposing magnetic fields,
  • In other words, due to the metallic surface of gold, the element gains visual value,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Possibility of custom modeling and adjusting to individual conditions,
  • Universal use in high-tech industry – they are utilized in HDD drives, motor assemblies, medical equipment, and modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in realizing threads and complex forms in magnets, we recommend using a housing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

The force parameter is a theoretical maximum value executed under specific, ideal conditions:
  • on a block made of structural steel, perfectly concentrating the magnetic field
  • with a cross-section minimum 10 mm
  • with an ideally smooth contact surface
  • without any clearance between the magnet and steel
  • under perpendicular force direction (90-degree angle)
  • at standard ambient temperature

Determinants of practical lifting force of a magnet

During everyday use, the real power results from a number of factors, listed from crucial:
  • Gap (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Force direction – 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 sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Plate material – mild steel attracts best. Alloy steels decrease magnetic permeability and lifting capacity.
  • Base smoothness – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Thermal environment – heating the magnet results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity was determined by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with neodymium magnets
Skin irritation risks

Some people have a contact allergy to Ni, which is the standard coating for neodymium magnets. Prolonged contact might lead to skin redness. It is best to wear safety gloves.

Electronic hazard

Powerful magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Magnet fragility

Beware of splinters. Magnets can fracture upon violent connection, launching shards into the air. We recommend safety glasses.

Health Danger

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

Crushing force

Risk of injury: The attraction force is so immense that it can result in blood blisters, pinching, and even bone fractures. Use thick gloves.

Permanent damage

Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Flammability

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

Handling rules

Use magnets consciously. Their immense force can surprise even professionals. Be vigilant and do not underestimate their power.

Magnetic interference

A powerful magnetic field interferes with the functioning of magnetometers in phones and GPS navigation. Keep magnets near a smartphone to prevent damaging the sensors.

Danger to the youngest

NdFeB magnets are not intended for children. Swallowing multiple magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates immediate surgery.

Danger! Details about hazards in the article: Safety of working with magnets.