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MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

lamellar magnet

Catalog no 020397

GTIN/EAN: 5906301811909

5.00
Load capacity 11.85 kg / 116.27 N Magnetic Induction 321.37 mT / 3214 Gs
length
40 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
15 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
view parameters »

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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 details - MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

properties
properties values
Cat. no. 020397
GTIN/EAN 5906301811909
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 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 15 g
Magnetization Direction ↑ axial
Load capacity ~ ? 11.85 kg / 116.27 N
Magnetic Induction ~ ? 321.37 mT / 3214 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x5x2[7/3.5] / 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 modeling of the assembly - technical parameters

These data constitute the direct effect of a mathematical analysis. Results were calculated on models for the class Nd2Fe14B. Real-world parameters may deviate from the simulation results. Use these calculations as a reference point when designing systems.

Table 1: Static force (pull vs distance) - power drop
MPL 40x10x5x2[7/3.5] / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3212 Gs
321.2 mT
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
 dangerous!
1 mm 2791 Gs
279.1 mT
 8.95 kg / 19.73 pounds
8947.7 g / 87.8 N
 strong
2 mm 2358 Gs
235.8 mT
 6.38 kg / 14.08 pounds
6384.9 g / 62.6 N
 strong
3 mm 1965 Gs
196.5 mT
 4.43 kg / 9.77 pounds
4432.4 g / 43.5 N
 strong
5 mm 1360 Gs
136.0 mT
 2.12 kg / 4.68 pounds
2122.9 g / 20.8 N
 strong
10 mm 615 Gs
61.5 mT
 0.43 kg / 0.96 pounds
434.1 g / 4.3 N
 low risk
15 mm 329 Gs
32.9 mT
 0.12 kg / 0.27 pounds
124.5 g / 1.2 N
 low risk
20 mm 195 Gs
19.5 mT
 0.04 kg / 0.10 pounds
43.9 g / 0.4 N
 low risk
30 mm 83 Gs
8.3 mT
 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
 low risk
50 mm 24 Gs
2.4 mT
 0.00 kg / 0.00 pounds
0.6 g / 0.0 N
 low risk
Grip strength decreases drastically with every subsequent millimeter of spacing. Note that even a microscopic distance (e.g., dirt, paint, veneer) noticeably reduces the pull force. Magnetic products hold strongest at the point of direct contact; air break nullifies the force. Analyze how flashily the load capacity fall, when the product does not touch tightly to the metal substrate. When planning the assembly, eliminate unnecessary gaps.

Table 2: Slippage capacity (vertical surface)
MPL 40x10x5x2[7/3.5] / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.37 kg / 5.22 pounds
2370.0 g / 23.2 N
1 mm Stal (~0.2) 1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
2 mm Stal (~0.2) 1.28 kg / 2.81 pounds
1276.0 g / 12.5 N
3 mm Stal (~0.2) 0.89 kg / 1.95 pounds
886.0 g / 8.7 N
5 mm Stal (~0.2) 0.42 kg / 0.93 pounds
424.0 g / 4.2 N
10 mm Stal (~0.2) 0.09 kg / 0.19 pounds
86.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
This section calculates the theoretical shear load sufficient to start the sliding of the magnet vertically on a upright steel wall (assuming standard friction coefficient). The holding force is relative to the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MPL 40x10x5x2[7/3.5] / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.55 kg / 7.84 pounds
3555.0 g / 34.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.37 kg / 5.22 pounds
2370.0 g / 23.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.19 kg / 2.61 pounds
1185.0 g / 11.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.93 kg / 13.06 pounds
5925.0 g / 58.1 N
When hanging a magnet on a upright surface (e.g., a board), it you can count on just approx. 1/5 of nominal attraction strength. Gravitational force as well as a low friction coefficient influence the fact that products move down easier than they pull off. Want to create a hanger? Remember that the shear force is significantly lower than the maximum static pull force. On a painted metal, the magnet will slip down under a much lighter load. Utilizing a rubberized pad can significantly improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MPL 40x10x5x2[7/3.5] / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.59 kg / 1.31 pounds
592.5 g / 5.8 N
1 mm
13%
 1.48 kg / 3.27 pounds
1481.3 g / 14.5 N
2 mm
25%
 2.96 kg / 6.53 pounds
2962.5 g / 29.1 N
3 mm
38%
 4.44 kg / 9.80 pounds
4443.8 g / 43.6 N
5 mm
63%
 7.41 kg / 16.33 pounds
7406.3 g / 72.7 N
10 mm
100%
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
11 mm
100%
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
12 mm
100%
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
A thin metal plate cannot conduct the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To utilize full efficiency of this neodymium's power, you require a sufficiently solid backing of metal. The material oversaturation means that on delicate walls (e.g., car bodies), the product shows lower pull force. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal resistance (stability) - power drop
MPL 40x10x5x2[7/3.5] / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
 OK
40 °C -2.2% 11.59 kg / 25.55 pounds
11589.3 g / 113.7 N
 OK
60 °C -4.4% 11.33 kg / 24.98 pounds
11328.6 g / 111.1 N
80 °C -6.6% 11.07 kg / 24.40 pounds
11067.9 g / 108.6 N
100 °C -28.8% 8.44 kg / 18.60 pounds
8437.2 g / 82.8 N
Ordinary NdFeB products lose strength above the temperature limit. Avoid high temperatures – excessive heat can permanently destroy this magnet. As the temperature rises, the magnet's power momentarily decreases. Avoid using this product close to heaters exceeding its safe range. Too high temperature will result in irreversible degradation of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) are more susceptible to demagnetization sooner compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MPL 40x10x5x2[7/3.5] / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 25.44 kg / 56.10 pounds
4 569 Gs
3.82 kg / 8.41 pounds
3817 g / 37.4 N
 N/A
1 mm 22.33 kg / 49.22 pounds
6 018 Gs
3.35 kg / 7.38 pounds
3349 g / 32.9 N
 20.09 kg / 44.30 pounds
~0 Gs
2 mm 19.21 kg / 42.36 pounds
5 582 Gs
2.88 kg / 6.35 pounds
2882 g / 28.3 N
 17.29 kg / 38.12 pounds
~0 Gs
3 mm 16.31 kg / 35.96 pounds
5 144 Gs
2.45 kg / 5.39 pounds
2447 g / 24.0 N
 14.68 kg / 32.36 pounds
~0 Gs
5 mm 11.45 kg / 25.23 pounds
4 309 Gs
1.72 kg / 3.78 pounds
1717 g / 16.8 N
 10.30 kg / 22.71 pounds
~0 Gs
10 mm 4.56 kg / 10.05 pounds
2 719 Gs
0.68 kg / 1.51 pounds
684 g / 6.7 N
 4.10 kg / 9.04 pounds
~0 Gs
20 mm 0.93 kg / 2.05 pounds
1 230 Gs
0.14 kg / 0.31 pounds
140 g / 1.4 N
 0.84 kg / 1.85 pounds
~0 Gs
50 mm 0.04 kg / 0.08 pounds
249 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.03 kg / 0.08 pounds
~0 Gs
60 mm 0.02 kg / 0.04 pounds
167 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.03 pounds
~0 Gs
70 mm 0.01 kg / 0.02 pounds
116 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.01 pounds
84 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.01 pounds
62 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
48 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums attract each other from a much further distance than a magnet and steel setup. The setup of two magnets generates a stronger field and a further horizon of action. Planning to create a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the pinch force is massive. The levitation is a bit weaker than the attraction, but still significant.
*Flux density between like poles drops to ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Attention: Calculations show friction force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - precautionary measures
MPL 40x10x5x2[7/3.5] / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.0 cm
Hearing aid 10 Gs (1.0 mT) 7.0 cm
Timepiece 20 Gs (2.0 mT) 5.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.5 cm
Remote 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Powerful magnet radiation poses a serious hazard to electronics as well as pacemakers. These NdFeB products produce a flux that destroys function of digital equipment. Notice: the unseen radiation acts through matter and plastic. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
MPL 40x10x5x2[7/3.5] / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.30 km/h
(6.75 m/s)
 0.34 J
30 mm 24.92 km/h
(6.92 m/s)
 0.36 J
50 mm 24.93 km/h
(6.92 m/s)
 0.36 J
100 mm 24.94 km/h
(6.93 m/s)
 0.36 J
Magnetic elements are very brittle – a strong collision with metal can result in shattering. Watch the impact speed – a neodymium left loose turns into a projectile. Impact energy can trigger coating fragments or painful pinches to fingers. Always hold the magnet during installation so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Coating parameters (durability)
MPL 40x10x5x2[7/3.5] / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MPL 40x10x5x2[7/3.5] / N38

Parameter Value SI Unit / Description
Magnetic Flux 11 419 Mx 114.2 µWb
Pc Coefficient 0.31 Low (Flat)
Total magnetic flux emitted by the magnet pole. Key data for generator designers as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
MPL 40x10x5x2[7/3.5] / N38

Environment Effective steel pull Effect
Air (land) 11.85 kg Standard
Water (riverbed) 13.57 kg
(+1.72 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.

1. Vertical hold

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

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.

3. Power loss vs temp

*For N38 grade, the safety 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.

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: 020397-2026
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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 40x10x5 mm and a weight of 15 g, guarantees premium class connection. This magnetic block with a force of 116.27 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
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 40x10x5x2[7/3.5] / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. They work great as invisible mounts under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 40x10x5x2[7/3.5] / N38, we recommend utilizing 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.
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: 40 mm (length), 10 mm (width), and 5 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 11.85 kg (force ~116.27 N), which, with such a compact shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of neodymium magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • They retain magnetic properties for almost ten years – the loss is just ~1% (based on simulations),
  • They have excellent resistance to magnetism drop due to external magnetic sources,
  • By using a lustrous coating of gold, the element has an aesthetic look,
  • Magnets are distinguished by excellent magnetic induction on the outer layer,
  • 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 precise machining as well as adjusting to specific conditions,
  • Fundamental importance in electronics industry – they find application in mass storage devices, electric drive systems, diagnostic systems, and complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of neodymium magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited ability of making threads in the magnet and complicated shapes - recommended is cover - mounting mechanism.
  • Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Additionally, small components of these magnets can complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Detachment force of the magnet in optimal conditions – what it depends on?

Breakaway force was determined for ideal contact conditions, taking into account:
  • on a plate made of mild steel, effectively closing the magnetic flux
  • possessing a thickness of min. 10 mm to avoid saturation
  • with an polished touching surface
  • without any clearance between the magnet and steel
  • under vertical force direction (90-degree angle)
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

Bear in mind that the application force may be lower influenced by elements below, starting with the most relevant:
  • Space between surfaces – every millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Alloy admixtures lower magnetic properties and lifting capacity.
  • Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal environment – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, however under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

H&S for magnets
Avoid contact if allergic

A percentage of the population have a sensitization to Ni, which is the typical protective layer for neodymium magnets. Frequent touching may cause dermatitis. We strongly advise use safety gloves.

Magnets are brittle

Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. Eye protection is mandatory.

Flammability

Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.

Life threat

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Respect the power

Use magnets consciously. Their powerful strength can surprise even experienced users. Be vigilant and respect their force.

Magnetic media

Powerful magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Physical harm

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

Product not for children

Strictly keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are tragic.

Heat warning

Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Magnetic interference

An intense magnetic field disrupts the functioning of compasses in smartphones and GPS navigation. Maintain magnets near a smartphone to avoid breaking the sensors.

Attention! More info about hazards in the article: Safety of working with magnets.