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MPL 80x40x15 / N38 - lamellar magnet

lamellar magnet

Catalog no 020177

GTIN/EAN: 5906301811831

5.00
Load capacity 73.57 kg / 721.75 N Magnetic Induction 285.78 mT / 2858 Gs
length
80 mm [±0,1 mm]
Width
40 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
360 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
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139.54 zł with VAT / pcs + price for transport

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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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Technical specification - MPL 80x40x15 / N38 - lamellar magnet

Specification / characteristics - MPL 80x40x15 / N38 - lamellar magnet

properties
properties values
Cat. no. 020177
GTIN/EAN 5906301811831
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 80 mm [±0,1 mm]
Width 40 mm [±0,1 mm]
Height 15 mm [±0,1 mm]
Weight 360 g
Magnetization Direction ↑ axial
Load capacity ~ ? 73.57 kg / 721.75 N
Magnetic Induction ~ ? 285.78 mT / 2858 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 80x40x15 / 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 - data

The following data are the result of a mathematical analysis. Values were calculated on models for the material Nd2Fe14B. Operational parameters may differ from theoretical values. Treat these data as a supplementary guide for designers.

Table 1: Static force (force vs gap) - interaction chart
MPL 80x40x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2857 Gs
285.7 mT
 73.57 kg / 162.19 LBS
73570.0 g / 721.7 N
 dangerous!
1 mm 2778 Gs
277.8 mT
 69.55 kg / 153.32 LBS
69546.1 g / 682.2 N
 dangerous!
2 mm 2693 Gs
269.3 mT
 65.33 kg / 144.03 LBS
65331.2 g / 640.9 N
 dangerous!
3 mm 2603 Gs
260.3 mT
 61.05 kg / 134.59 LBS
61047.5 g / 598.9 N
 dangerous!
5 mm 2415 Gs
241.5 mT
 52.56 kg / 115.87 LBS
52559.7 g / 515.6 N
 dangerous!
10 mm 1943 Gs
194.3 mT
 34.02 kg / 75.00 LBS
34021.1 g / 333.7 N
 dangerous!
15 mm 1527 Gs
152.7 mT
 21.01 kg / 46.31 LBS
21007.7 g / 206.1 N
 dangerous!
20 mm 1192 Gs
119.2 mT
 12.81 kg / 28.24 LBS
12808.1 g / 125.6 N
 dangerous!
30 mm 736 Gs
73.6 mT
 4.89 kg / 10.77 LBS
4886.6 g / 47.9 N
 medium risk
50 mm 313 Gs
31.3 mT
 0.88 kg / 1.95 LBS
884.8 g / 8.7 N
 weak grip
Pulling power drops significantly with every subsequent millimeter of gap. Remember that even the smallest gap (e.g., contamination, varnish, veneer) noticeably diminishes the holding power. Neodymiums work strongest in perfect adhesion; distance weakens the force. Analyze how quickly the parameters fall, when the magnet does not adhere directly to the metal substrate. When designing the arrangement, discard additional spacers.

Table 2: Shear capacity (vertical surface)
MPL 80x40x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 14.71 kg / 32.44 LBS
14714.0 g / 144.3 N
1 mm Stal (~0.2) 13.91 kg / 30.67 LBS
13910.0 g / 136.5 N
2 mm Stal (~0.2) 13.07 kg / 28.81 LBS
13066.0 g / 128.2 N
3 mm Stal (~0.2) 12.21 kg / 26.92 LBS
12210.0 g / 119.8 N
5 mm Stal (~0.2) 10.51 kg / 23.17 LBS
10512.0 g / 103.1 N
10 mm Stal (~0.2) 6.80 kg / 15.00 LBS
6804.0 g / 66.7 N
15 mm Stal (~0.2) 4.20 kg / 9.26 LBS
4202.0 g / 41.2 N
20 mm Stal (~0.2) 2.56 kg / 5.65 LBS
2562.0 g / 25.1 N
30 mm Stal (~0.2) 0.98 kg / 2.16 LBS
978.0 g / 9.6 N
50 mm Stal (~0.2) 0.18 kg / 0.39 LBS
176.0 g / 1.7 N
The table below presents the theoretical holding capacity needed to start the shifting of the magnet down along a upright steel wall (assuming standard friction coefficient). This parameter depends on the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MPL 80x40x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
22.07 kg / 48.66 LBS
22071.0 g / 216.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
14.71 kg / 32.44 LBS
14714.0 g / 144.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
7.36 kg / 16.22 LBS
7357.0 g / 72.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
36.79 kg / 81.10 LBS
36785.0 g / 360.9 N
When hanging a element on a upright surface (e.g., a fridge), it you can count on barely about 20%-30% of nominal attraction strength. Gravitational force as well as a weak degree of grip mean that magnets slide down easier than they pull off. Designing a wall mount? Consider that the shear force is significantly lower than the maximum static pull force. On a painted metal, the element will slide down under a significantly smaller weight. Utilizing a rubberized pad can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 80x40x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 2.45 kg / 5.41 LBS
2452.3 g / 24.1 N
1 mm
8%
 6.13 kg / 13.52 LBS
6130.8 g / 60.1 N
2 mm
17%
 12.26 kg / 27.03 LBS
12261.7 g / 120.3 N
3 mm
25%
 18.39 kg / 40.55 LBS
18392.5 g / 180.4 N
5 mm
42%
 30.65 kg / 67.58 LBS
30654.2 g / 300.7 N
10 mm
83%
 61.31 kg / 135.16 LBS
61308.3 g / 601.4 N
11 mm
92%
 67.44 kg / 148.68 LBS
67439.2 g / 661.6 N
12 mm
100%
 73.57 kg / 162.19 LBS
73570.0 g / 721.7 N
A thin sheet is unable to conduct the full magnetic flux, which wastes potential of the holder. Should you mount a strong magnet to a too thin substrate, the flux will penetrate right through and the pull force will drop sharply. To utilize 100% of this neodymium's power, you need a suitably thick element of steel. The material oversaturation causes that on thin elements (e.g., thin profiles), the holder holds weaker. We suggest choosing the steel thickness according to the table below.

Table 5: Working in heat (stability) - thermal limit
MPL 80x40x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 73.57 kg / 162.19 LBS
73570.0 g / 721.7 N
 OK
40 °C -2.2% 71.95 kg / 158.63 LBS
71951.5 g / 705.8 N
 OK
60 °C -4.4% 70.33 kg / 155.06 LBS
70332.9 g / 690.0 N
80 °C -6.6% 68.71 kg / 151.49 LBS
68714.4 g / 674.1 N
100 °C -28.8% 52.38 kg / 115.48 LBS
52381.8 g / 513.9 N
Ordinary NdFeB products irreversibly lose power above the temperature limit. Protect against heat – heat can permanently demagnetize this product. As the temperature rises, the magnet's power momentarily drops. Avoid using this product near heat sources higher than its safe range. Too high temperature will cause irreversible degradation of magnetism.
*Important note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) risk losing magnetic properties sooner compared to rod magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field range
MPL 80x40x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 161.08 kg / 355.13 LBS
4 384 Gs
24.16 kg / 53.27 LBS
24163 g / 237.0 N
 N/A
1 mm 156.77 kg / 345.63 LBS
5 638 Gs
23.52 kg / 51.84 LBS
23516 g / 230.7 N
 141.10 kg / 311.07 LBS
~0 Gs
2 mm 152.27 kg / 335.70 LBS
5 556 Gs
22.84 kg / 50.36 LBS
22841 g / 224.1 N
 137.05 kg / 302.13 LBS
~0 Gs
3 mm 147.69 kg / 325.60 LBS
5 472 Gs
22.15 kg / 48.84 LBS
22153 g / 217.3 N
 132.92 kg / 293.04 LBS
~0 Gs
5 mm 138.36 kg / 305.04 LBS
5 297 Gs
20.75 kg / 45.76 LBS
20754 g / 203.6 N
 124.53 kg / 274.53 LBS
~0 Gs
10 mm 115.08 kg / 253.71 LBS
4 830 Gs
17.26 kg / 38.06 LBS
17262 g / 169.3 N
 103.57 kg / 228.34 LBS
~0 Gs
20 mm 74.49 kg / 164.22 LBS
3 886 Gs
11.17 kg / 24.63 LBS
11174 g / 109.6 N
 67.04 kg / 147.80 LBS
~0 Gs
50 mm 17.20 kg / 37.91 LBS
1 867 Gs
2.58 kg / 5.69 LBS
2580 g / 25.3 N
 15.48 kg / 34.12 LBS
~0 Gs
60 mm 10.70 kg / 23.59 LBS
1 473 Gs
1.60 kg / 3.54 LBS
1605 g / 15.7 N
 9.63 kg / 21.23 LBS
~0 Gs
70 mm 6.78 kg / 14.94 LBS
1 172 Gs
1.02 kg / 2.24 LBS
1017 g / 10.0 N
 6.10 kg / 13.45 LBS
~0 Gs
80 mm 4.38 kg / 9.65 LBS
942 Gs
0.66 kg / 1.45 LBS
657 g / 6.4 N
 3.94 kg / 8.69 LBS
~0 Gs
90 mm 2.89 kg / 6.36 LBS
765 Gs
0.43 kg / 0.95 LBS
433 g / 4.2 N
 2.60 kg / 5.72 LBS
~0 Gs
100 mm 1.94 kg / 4.27 LBS
627 Gs
0.29 kg / 0.64 LBS
291 g / 2.9 N
 1.74 kg / 3.84 LBS
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and steel combination. Such a system of two magnets creates a more powerful interaction and a larger range of action. Designing a strong closure? Use a pair of magnets instead of a neodymium and a steel. Remember that when connecting a pair of magnets, the impact force is huge. The repulsion force is slightly lower than the attraction, but still large.
*Flux density between like poles is approximately ~0 Gs at the midpoint of the gap (resulting from vector opposition).
* Estimates apply to sliding force of a pair of same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - precautionary measures
MPL 80x40x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 26.0 cm
Hearing aid 10 Gs (1.0 mT) 20.5 cm
Mechanical watch 20 Gs (2.0 mT) 16.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 12.5 cm
Car key 50 Gs (5.0 mT) 11.5 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.5 cm
Extremely neodym field poses a real danger to IT equipment and pacemakers. These magnets generate a field that prevents correct functioning of digital equipment. Notice: the invisible magnetic field penetrates the body and housings. Special caution must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MPL 80x40x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.36 km/h
(5.38 m/s)
 5.20 J
30 mm 24.22 km/h
(6.73 m/s)
 8.15 J
50 mm 24.87 km/h
(6.91 m/s)
 8.59 J
100 mm 25.05 km/h
(6.96 m/s)
 8.72 J
Neodymium magnets are delicate – a collision with steel risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can cause material chips or dangerous crushing to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear eye protection when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 80x40x15 / 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 following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MPL 80x40x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 94 833 Mx 948.3 µWb
Pc Coefficient 0.33 Low (Flat)
Flux value passing through the magnet pole. Key data in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MPL 80x40x15 / N38

Environment Effective steel pull Effect
Air (land) 73.57 kg Standard
Water (riverbed) 84.24 kg
(+10.67 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!
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Sliding resistance

*Caution: 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) severely reduces the holding force.

3. Thermal stability

*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) = 0.33

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

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: 020177-2026
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Component MPL 80x40x15 / N38 features a flat shape and industrial pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 721.75 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 80x40x15 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 80x40x15 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 73.57 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.
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 (80x40 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 80x40x15 mm, which, at a weight of 360 g, makes it an element with high energy density. The key parameter here is the holding force amounting to approximately 73.57 kg (force ~721.75 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of neodymium magnets.

Strengths

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
  • They possess excellent resistance to magnetism drop as a result of external fields,
  • Thanks to the reflective finish, the layer of Ni-Cu-Ni, gold, or silver gives an professional appearance,
  • Magnetic induction on the top side of the magnet remains maximum,
  • 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...
  • Thanks to freedom in forming and the capacity to customize to individual projects,
  • Versatile presence in modern technologies – they find application in HDD drives, electromotive mechanisms, medical devices, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which makes them useful in compact constructions

Weaknesses

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce 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 recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We suggest casing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated forms.
  • Health risk to health – tiny shards 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 magnets can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

The specified lifting capacity concerns the peak performance, measured under ideal test conditions, namely:
  • on a base made of structural steel, effectively closing the magnetic field
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with an ground touching surface
  • with zero gap (without coatings)
  • for force applied at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the magnet holding will differ subject to elements below, in order of importance:
  • Distance – existence of any layer (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Material composition – different alloys reacts the same. High carbon content worsen the attraction effect.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Temperature – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, whereas under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate reduces the load capacity.

H&S for magnets
Finger safety

Protect your hands. Two powerful magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Handling rules

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

This is not a toy

These products are not suitable for play. Swallowing several magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and requires urgent medical intervention.

Mechanical processing

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

Threat to navigation

A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Maintain magnets near a smartphone to prevent breaking the sensors.

Avoid contact if allergic

Some people experience a sensitization to nickel, which is the common plating for NdFeB magnets. Extended handling may cause a rash. We recommend use protective gloves.

Magnet fragility

Protect your eyes. Magnets can explode upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Heat warning

Keep cool. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Medical implants

For implant holders: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Data carriers

Very strong magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

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