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MPL 40x7x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020162

GTIN/EAN: 5906301811688

5.00
Load capacity 7.14 kg / 70.02 N Magnetic Induction 284.46 mT / 2845 Gs
length
40 mm [±0,1 mm]
Width
7 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
6.3 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
see technical data »

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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.

PDF report Calculator
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Parameters and form of a neodymium magnet can be tested with our magnetic calculator.

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Technical data - MPL 40x7x3 / N38 - lamellar magnet

Specification / characteristics - MPL 40x7x3 / N38 - lamellar magnet

properties
properties values
Cat. no. 020162
GTIN/EAN 5906301811688
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 7 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 6.3 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.14 kg / 70.02 N
Magnetic Induction ~ ? 284.46 mT / 2845 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x7x3 / 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 modeling of the product - report

Presented information represent the outcome of a mathematical analysis. Values are based on algorithms for the material Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Please consider these data as a reference point for designers.

Table 1: Static force (pull vs gap) - characteristics
MPL 40x7x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2843 Gs
284.3 mT
 7.14 kg / 15.74 lbs
7140.0 g / 70.0 N
 strong
1 mm 2314 Gs
231.4 mT
 4.73 kg / 10.43 lbs
4729.9 g / 46.4 N
 strong
2 mm 1788 Gs
178.8 mT
 2.83 kg / 6.23 lbs
2825.3 g / 27.7 N
 strong
3 mm 1365 Gs
136.5 mT
 1.65 kg / 3.63 lbs
1645.1 g / 16.1 N
 low risk
5 mm 824 Gs
82.4 mT
 0.60 kg / 1.32 lbs
599.2 g / 5.9 N
 low risk
10 mm 317 Gs
31.7 mT
 0.09 kg / 0.20 lbs
88.6 g / 0.9 N
 low risk
15 mm 160 Gs
16.0 mT
 0.02 kg / 0.05 lbs
22.5 g / 0.2 N
 low risk
20 mm 92 Gs
9.2 mT
 0.01 kg / 0.02 lbs
7.5 g / 0.1 N
 low risk
30 mm 38 Gs
3.8 mT
 0.00 kg / 0.00 lbs
1.3 g / 0.0 N
 low risk
50 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 low risk
Magnetic force weakens drastically per each millimeter of distance. Keep in mind that even a very thin break (e.g., contamination, varnish, dust) strongly reduces the pull force. Neodymiums operate strongest during direct contact; distance nullifies the power. See how rapidly the parameters drop, when the magnet does not adhere flatly to the metal substrate. When planning the mounting, avoid additional spacers.

Table 2: Vertical load (vertical surface)
MPL 40x7x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.43 kg / 3.15 lbs
1428.0 g / 14.0 N
1 mm Stal (~0.2) 0.95 kg / 2.09 lbs
946.0 g / 9.3 N
2 mm Stal (~0.2) 0.57 kg / 1.25 lbs
566.0 g / 5.6 N
3 mm Stal (~0.2) 0.33 kg / 0.73 lbs
330.0 g / 3.2 N
5 mm Stal (~0.2) 0.12 kg / 0.26 lbs
120.0 g / 1.2 N
10 mm Stal (~0.2) 0.02 kg / 0.04 lbs
18.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 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
This section calculates the estimated weight limit required to cause the sliding of the magnet downwards along a upright steel plate (assuming typical friction coefficient). This value depends on the gap size between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 40x7x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.14 kg / 4.72 lbs
2142.0 g / 21.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.43 kg / 3.15 lbs
1428.0 g / 14.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.71 kg / 1.57 lbs
714.0 g / 7.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.57 kg / 7.87 lbs
3570.0 g / 35.0 N
When hanging a holder on a vertical plane (e.g., a car body), it will maintain just approx. 20%-30% of its nominal power. Gravitational force and a low friction coefficient cause that holders slip faster than they pop off the substrate. Want to create a hanger? Remember that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a noticeably lighter load. Using a rubber pad can drastically increase the grip.

Table 4: Material efficiency (saturation) - power losses
MPL 40x7x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.71 kg / 1.57 lbs
714.0 g / 7.0 N
1 mm
25%
 1.79 kg / 3.94 lbs
1785.0 g / 17.5 N
2 mm
50%
 3.57 kg / 7.87 lbs
3570.0 g / 35.0 N
3 mm
75%
 5.35 kg / 11.81 lbs
5355.0 g / 52.5 N
5 mm
100%
 7.14 kg / 15.74 lbs
7140.0 g / 70.0 N
10 mm
100%
 7.14 kg / 15.74 lbs
7140.0 g / 70.0 N
11 mm
100%
 7.14 kg / 15.74 lbs
7140.0 g / 70.0 N
12 mm
100%
 7.14 kg / 15.74 lbs
7140.0 g / 70.0 N
A thin sheet is unable to absorb the full magnetic flux, which wastes potential of the magnet. If you mount a strong magnet to a too thin substrate, the field will penetrate right through and the attraction force will be weaker. To utilize full efficiency of this neodymium's power, you need a suitably thick piece of steel. The material oversaturation causes that on delicate walls (e.g., car bodies), the product shows lower pull force. We recommend selecting the steel dimension based on the following data.

Table 5: Working in heat (material behavior) - resistance threshold
MPL 40x7x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.14 kg / 15.74 lbs
7140.0 g / 70.0 N
 OK
40 °C -2.2% 6.98 kg / 15.39 lbs
6982.9 g / 68.5 N
 OK
60 °C -4.4% 6.83 kg / 15.05 lbs
6825.8 g / 67.0 N
80 °C -6.6% 6.67 kg / 14.70 lbs
6668.8 g / 65.4 N
100 °C -28.8% 5.08 kg / 11.21 lbs
5083.7 g / 49.9 N
Classic neodymiums irreversibly lose power after exceeding the maximum temperature. Avoid high temperatures – excessive heat can irreversibly destroy this product. As the temperature rises, the neodymium's force briefly drops. Avoid using this product in hot environments higher than its working range. Too high temperature will cause destruction of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than taller cylinders. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 40x7x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.95 kg / 30.75 lbs
4 204 Gs
2.09 kg / 4.61 lbs
2092 g / 20.5 N
 N/A
1 mm 11.58 kg / 25.53 lbs
5 180 Gs
1.74 kg / 3.83 lbs
1737 g / 17.0 N
 10.42 kg / 22.98 lbs
~0 Gs
2 mm 9.24 kg / 20.37 lbs
4 628 Gs
1.39 kg / 3.06 lbs
1386 g / 13.6 N
 8.32 kg / 18.34 lbs
~0 Gs
3 mm 7.19 kg / 15.86 lbs
4 083 Gs
1.08 kg / 2.38 lbs
1079 g / 10.6 N
 6.47 kg / 14.27 lbs
~0 Gs
5 mm 4.21 kg / 9.28 lbs
3 124 Gs
0.63 kg / 1.39 lbs
632 g / 6.2 N
 3.79 kg / 8.36 lbs
~0 Gs
10 mm 1.17 kg / 2.58 lbs
1 647 Gs
0.18 kg / 0.39 lbs
176 g / 1.7 N
 1.05 kg / 2.32 lbs
~0 Gs
20 mm 0.17 kg / 0.38 lbs
633 Gs
0.03 kg / 0.06 lbs
26 g / 0.3 N
 0.16 kg / 0.34 lbs
~0 Gs
50 mm 0.01 kg / 0.01 lbs
115 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.01 lbs
76 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
53 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
38 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
28 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
21 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnetic products interact from a much further distance than a neodymium and metal setup. Such a system of magnet-to-magnet generates a stronger field and a wider radius of performance. Planning to create a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when attracting two neodymiums, the pinch force is massive. The levitation is a bit weaker than the connection force, but still significant.
*Field value in repulsion mode reaches ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Note: Calculations demonstrate sliding force of two identical magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - precautionary measures
MPL 40x7x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Mechanical watch 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.0 cm
Remote 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation is a real danger to electronic devices and medical implants. These NdFeB products generate a flux that destroys function of digital equipment. Remember: the unseen radiation acts through matter and glass. Increased vigilance must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MPL 40x7x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.74 km/h
(6.87 m/s)
 0.15 J
30 mm 25.01 km/h
(6.95 m/s)
 0.15 J
50 mm 25.01 km/h
(6.95 m/s)
 0.15 J
100 mm 25.02 km/h
(6.95 m/s)
 0.15 J
Magnetic elements are prone to chipping – a strong collision with metal can result in shattering. Watch the impact speed – a neodymium left loose becomes dangerous. Impact energy can trigger coating fragments or dangerous crushing to skin. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when working with large magnets.

Table 9: Corrosion resistance
MPL 40x7x3 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MPL 40x7x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 379 Mx 63.8 µWb
Pc Coefficient 0.24 Low (Flat)
Flux value emitted by the magnet pole. Key data when building generators as well as sensors. Pc value defines the working geometry.

Table 11: Submerged application
MPL 40x7x3 / N38

Environment Effective steel pull Effect
Air (land) 7.14 kg Standard
Water (riverbed) 8.18 kg
(+1.04 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
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. Sliding resistance

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

2. Steel thickness impact

*Thin steel (e.g. computer case) significantly reduces the holding force.

3. Power loss vs temp

*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) = 0.24

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

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%

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: 020162-2026
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MPL 40x10x4x2[7/3.5] / N38 - lamellar magnet

9.21 zł brutto / pcs
This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 40x7x3 mm and a weight of 6.3 g, guarantees premium class connection. As a magnetic bar with high power (approx. 7.14 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is shifting 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 40x7x3 / 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. 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 generators and material handling systems. Thanks to the flat surface and high force (approx. 7.14 kg), they are ideal as closers in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 40x7x3 / 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 clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 40x7x3 / N38 model is magnetized axially (dimension 3 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. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 7 mm (width), and 3 mm (thickness). It is a magnetic block with dimensions 40x7x3 mm and a self-weight of 6.3 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of rare earth magnets.

Benefits

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • Their strength remains stable, and after around 10 years it decreases only by ~1% (according to research),
  • They feature excellent resistance to magnetism drop as a result of external fields,
  • A magnet with a metallic silver surface looks better,
  • Neodymium magnets generate maximum magnetic induction on a their surface, which allows for strong attraction,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of detailed modeling as well as adjusting to precise requirements,
  • Fundamental importance in modern industrial fields – they find application in computer drives, electromotive mechanisms, medical devices, and multitasking production systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects 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 strength 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We suggest a housing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these magnets can disrupt the diagnostic process medical when they are in the body.
  • Due to neodymium price, their price exceeds standard values,

Holding force characteristics

Magnetic strength at its maximum – what it depends on?

Magnet power was defined for the most favorable conditions, taking into account:
  • with the use of a yoke made of special test steel, ensuring maximum field concentration
  • with a cross-section of at least 10 mm
  • with an polished contact surface
  • under conditions of gap-free contact (surface-to-surface)
  • under axial force direction (90-degree angle)
  • at room temperature

Lifting capacity in real conditions – factors

Please note that the working load will differ subject to the following factors, starting with the most relevant:
  • Air gap (betwixt the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Plate thickness – insufficiently thick steel does not close the flux, causing part of the power to be wasted to the other side.
  • Material type – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
  • Plate texture – ground elements ensure maximum contact, which increases force. Rough surfaces weaken the grip.
  • Temperature – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was measured with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet and the plate reduces the lifting capacity.

H&S for magnets
Respect the power

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Protect data

Equipment safety: Strong magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, timepieces).

Choking Hazard

Product intended for adults. Small elements pose a choking risk, leading to severe trauma. Keep away from children and animals.

Bodily injuries

Large magnets can smash fingers instantly. Never put your hand between two attracting surfaces.

Operating temperature

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its properties and strength.

Phone sensors

A strong magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Do not bring magnets close to a smartphone to avoid breaking the sensors.

Life threat

For implant holders: Strong magnetic fields affect medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

Dust is flammable

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Shattering risk

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Nickel coating and allergies

Certain individuals experience a hypersensitivity to Ni, which is the common plating for neodymium magnets. Frequent touching may cause a rash. It is best to use protective gloves.

Danger! Details about hazards in the article: Magnet Safety Guide.