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MPL 40x10x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020150

GTIN/EAN: 5906301811565

5.00

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

12 g

Magnetization Direction

↑ axial

Load capacity

9.31 kg / 91.33 N

Magnetic Induction

275.57 mT / 2756 Gs

Coating

[NiCuNi] Nickel

see properties »

4.87 ZŁ with VAT / pcs + price for transport

3.96 ZŁ net + 23% VAT / pcs

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Technical - MPL 40x10x4 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020150
GTIN/EAN 5906301811565
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 4 mm [±0,1 mm]
Weight 12 g
Magnetization Direction ↑ axial
Load capacity ~ ? 9.31 kg / 91.33 N
Magnetic Induction ~ ? 275.57 mT / 2756 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x4 / 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 analysis of the product - data

Presented data represent the outcome of a physical analysis. Values were calculated on algorithms for the material Nd2Fe14B. Real-world conditions might slightly differ. Use these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - characteristics
MPL 40x10x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2755 Gs
275.5 mT
 9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
 warning
1 mm 2413 Gs
241.3 mT
 7.14 kg / 15.75 LBS
7143.1 g / 70.1 N
 warning
2 mm 2044 Gs
204.4 mT
 5.13 kg / 11.31 LBS
5128.9 g / 50.3 N
 warning
3 mm 1703 Gs
170.3 mT
 3.56 kg / 7.85 LBS
3559.5 g / 34.9 N
 warning
5 mm 1173 Gs
117.3 mT
 1.69 kg / 3.72 LBS
1688.2 g / 16.6 N
 low risk
10 mm 522 Gs
52.2 mT
 0.33 kg / 0.74 LBS
334.9 g / 3.3 N
 low risk
15 mm 277 Gs
27.7 mT
 0.09 kg / 0.21 LBS
94.2 g / 0.9 N
 low risk
20 mm 163 Gs
16.3 mT
 0.03 kg / 0.07 LBS
32.8 g / 0.3 N
 low risk
30 mm 69 Gs
6.9 mT
 0.01 kg / 0.01 LBS
5.8 g / 0.1 N
 low risk
50 mm 19 Gs
1.9 mT
 0.00 kg / 0.00 LBS
0.5 g / 0.0 N
 low risk
Grip strength drops significantly with every mm of gap. Note that even a very thin break (e.g., dirt, varnish, veneer) noticeably diminishes the holding power. Magnetic products hold most effectively in perfect adhesion; gap drastically cuts the force. Analyze how rapidly the parameters fall, when the magnet does not adhere tightly to the metal substrate. When planning the mounting, discard additional spacers.

Table 2: Vertical load (vertical surface)
MPL 40x10x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.86 kg / 4.11 LBS
1862.0 g / 18.3 N
1 mm Stal (~0.2) 1.43 kg / 3.15 LBS
1428.0 g / 14.0 N
2 mm Stal (~0.2) 1.03 kg / 2.26 LBS
1026.0 g / 10.1 N
3 mm Stal (~0.2) 0.71 kg / 1.57 LBS
712.0 g / 7.0 N
5 mm Stal (~0.2) 0.34 kg / 0.75 LBS
338.0 g / 3.3 N
10 mm Stal (~0.2) 0.07 kg / 0.15 LBS
66.0 g / 0.6 N
15 mm Stal (~0.2) 0.02 kg / 0.04 LBS
18.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The following data indicates the estimated force necessary to start the sliding of the magnet down on a upright steel wall (considering standard friction coefficient). This parameter is a function of the gap size between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MPL 40x10x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.79 kg / 6.16 LBS
2793.0 g / 27.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.86 kg / 4.11 LBS
1862.0 g / 18.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.93 kg / 2.05 LBS
931.0 g / 9.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.66 kg / 10.26 LBS
4655.0 g / 45.7 N
When placing a holder on a vertical wall (e.g., a board), it will maintain only about 20%-30% of its maximum pull force. Gravitational force and a low friction coefficient cause that holders slip faster than they pop off the substrate. Planning a wall mount? Remember that the shear force is noticeably lower than the maximum static pull force. On a painted metal, the magnet will slip down under a significantly smaller cargo. Using a rubber layer can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MPL 40x10x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.93 kg / 2.05 LBS
931.0 g / 9.1 N
1 mm
25%
 2.33 kg / 5.13 LBS
2327.5 g / 22.8 N
2 mm
50%
 4.66 kg / 10.26 LBS
4655.0 g / 45.7 N
3 mm
75%
 6.98 kg / 15.39 LBS
6982.5 g / 68.5 N
5 mm
100%
 9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
10 mm
100%
 9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
11 mm
100%
 9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
12 mm
100%
 9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
A too thin steel is incapable of take in the full magnetic flux, which squanders power of the holder. If you install a neodymium to a too thin substrate, the field will pass right through and the pull force will drop sharply. To utilize full efficiency of this neodymium's potential, you require a sufficiently solid element of metal. The material oversaturation means that on sheet metal structures (e.g., car bodies), the magnet shows lower pull force. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - power drop
MPL 40x10x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
 OK
40 °C -2.2% 9.11 kg / 20.07 LBS
9105.2 g / 89.3 N
 OK
60 °C -4.4% 8.90 kg / 19.62 LBS
8900.4 g / 87.3 N
80 °C -6.6% 8.70 kg / 19.17 LBS
8695.5 g / 85.3 N
100 °C -28.8% 6.63 kg / 14.61 LBS
6628.7 g / 65.0 N
Ordinary NdFeB products lose parameters after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly destroy this magnet. As the temperature rises, the neodymium's capacity briefly drops. Refrain from using this product close to heaters higher than its safe range. Exceeding the critical threshold will lead to permanent loss of magnetism.
*Important note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than long magnets. Warning indicator in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 40x10x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 18.71 kg / 41.25 LBS
4 164 Gs
2.81 kg / 6.19 LBS
2807 g / 27.5 N
 N/A
1 mm 16.57 kg / 36.53 LBS
5 185 Gs
2.49 kg / 5.48 LBS
2486 g / 24.4 N
 14.91 kg / 32.88 LBS
~0 Gs
2 mm 14.36 kg / 31.65 LBS
4 826 Gs
2.15 kg / 4.75 LBS
2153 g / 21.1 N
 12.92 kg / 28.48 LBS
~0 Gs
3 mm 12.24 kg / 26.98 LBS
4 455 Gs
1.84 kg / 4.05 LBS
1836 g / 18.0 N
 11.01 kg / 24.28 LBS
~0 Gs
5 mm 8.61 kg / 18.98 LBS
3 737 Gs
1.29 kg / 2.85 LBS
1291 g / 12.7 N
 7.75 kg / 17.08 LBS
~0 Gs
10 mm 3.39 kg / 7.48 LBS
2 346 Gs
0.51 kg / 1.12 LBS
509 g / 5.0 N
 3.05 kg / 6.73 LBS
~0 Gs
20 mm 0.67 kg / 1.48 LBS
1 045 Gs
0.10 kg / 0.22 LBS
101 g / 1.0 N
 0.61 kg / 1.34 LBS
~0 Gs
50 mm 0.03 kg / 0.06 LBS
207 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
60 mm 0.01 kg / 0.03 LBS
138 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.02 LBS
~0 Gs
70 mm 0.01 kg / 0.01 LBS
96 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.01 LBS
69 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
51 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
39 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 wider radius than a magnet and steel combination. The connection of two magnets produces a massive flux and a wider radius of operation. Want to build a powerful holder? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is extreme. The levitation is marginally weaker than the connection force, but still impressive.
*The magnetic induction between like poles is approximately ~0 Gs at the midpoint of the gap (resulting from vector opposition).
* Calculations apply to shear force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - warnings
MPL 40x10x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.5 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Mechanical watch 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Car key 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field poses a real danger to IT equipment as well as medical implants. These NdFeB products generate a flux that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field acts through matter and housings. Special caution must be exercised by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, membranes, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
MPL 40x10x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.72 km/h
(7.98 m/s)
 0.38 J
30 mm 48.67 km/h
(13.52 m/s)
 1.10 J
50 mm 62.82 km/h
(17.45 m/s)
 1.83 J
100 mm 88.83 km/h
(24.68 m/s)
 3.65 J
Neodymium magnets are delicate – a strong collision with metal causes immediate chipping. Control the attraction moment – a magnet released freely turns into a projectile. Impact energy can cause material chips or painful pinches to skin. Always hold the magnet during installation so it doesn't hit with great force against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 40x10x4 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Pc)
MPL 40x10x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 840 Mx 98.4 µWb
Pc Coefficient 0.26 Low (Flat)
Flux value emitted by the pole surface. Key data in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Submerged application
MPL 40x10x4 / N38

Environment Effective steel pull Effect
Air (land) 9.31 kg Standard
Water (riverbed) 10.66 kg
(+1.35 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.
In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Warning: On a vertical surface, the magnet retains merely a fraction of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) drastically 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) = 0.26

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
Chemical composition
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: 020150-2026
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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 40x10x4 mm and a weight of 12 g, guarantees premium class connection. This rectangular block with a force of 91.33 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.
Separating block 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 9.31 kg can pinch very hard and cause hematomas. 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. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 40x10x4 / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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 clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 40x10x4 / N38 model is magnetized axially (dimension 4 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 (40x10 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 40x10x4 mm, which, at a weight of 12 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 40x10x4 mm and a self-weight of 12 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of rare earth magnets.

Strengths

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • They retain magnetic properties for around 10 years – the drop is just ~1% (based on simulations),
  • Magnets effectively defend themselves against loss of magnetization caused by external fields,
  • By covering with a shiny layer of silver, the element acquires an professional look,
  • Neodymium magnets create maximum magnetic induction on a small surface, which allows for strong attraction,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of custom machining as well as adapting to defined conditions,
  • Huge importance in innovative solutions – they find application in data components, brushless drives, diagnostic systems, and multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Cons

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 protects the magnet but also improves its resistance to damage
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We recommend cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum holding power of the magnet – what affects it?

The force parameter is a theoretical maximum value executed under specific, ideal conditions:
  • with the use of a yoke made of special test steel, guaranteeing full magnetic saturation
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with a plane cleaned and smooth
  • without any air gap between the magnet and steel
  • under axial force direction (90-degree angle)
  • at temperature room level

Key elements affecting lifting force

It is worth knowing that the working load may be lower influenced by the following factors, in order of importance:
  • Distance (between the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Steel thickness – too thin steel causes magnetic saturation, causing part of the power to be wasted into the air.
  • Material type – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets
Permanent damage

Regular neodymium magnets (grade N) lose power when the temperature goes above 80°C. This process is irreversible.

Avoid contact if allergic

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, cease working with magnets and use protective gear.

Choking Hazard

Neodymium magnets are not suitable for play. Swallowing a few magnets can lead to them connecting inside the digestive tract, which poses a critical condition and requires immediate surgery.

Crushing risk

Big blocks can break fingers instantly. Under no circumstances place your hand betwixt two strong magnets.

Safe distance

Equipment safety: Strong magnets can damage data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).

Handling rules

Be careful. Rare earth magnets act from a distance and snap with huge force, often quicker than you can move away.

Life threat

Patients with a heart stimulator must keep an absolute distance from magnets. The magnetism can disrupt the functioning of the implant.

Flammability

Fire hazard: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.

Magnetic interference

Be aware: neodymium magnets produce a field that disrupts precision electronics. Maintain a separation from your phone, tablet, and GPS.

Material brittleness

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

Security! Need more info? Check our post: Why are neodymium magnets dangerous?