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

lamellar magnet

Catalog no 020397

GTIN/EAN: 5906301811909

5.00

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

9.93 with VAT / pcs + price for transport

8.07 ZŁ net + 23% VAT / pcs

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Physical properties - 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

Technical simulation of the assembly - technical parameters

These information are the result of a mathematical simulation. Values rely on models for the material Nd2Fe14B. Actual performance may differ from theoretical values. Please consider these data as a reference point when designing systems.

Table 1: Static force (force 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 lbs
11850.0 g / 116.2 N
critical level
1 mm 2791 Gs
279.1 mT
8.95 kg / 19.73 lbs
8947.7 g / 87.8 N
medium risk
2 mm 2358 Gs
235.8 mT
6.38 kg / 14.08 lbs
6384.9 g / 62.6 N
medium risk
3 mm 1965 Gs
196.5 mT
4.43 kg / 9.77 lbs
4432.4 g / 43.5 N
medium risk
5 mm 1360 Gs
136.0 mT
2.12 kg / 4.68 lbs
2122.9 g / 20.8 N
medium risk
10 mm 615 Gs
61.5 mT
0.43 kg / 0.96 lbs
434.1 g / 4.3 N
weak grip
15 mm 329 Gs
32.9 mT
0.12 kg / 0.27 lbs
124.5 g / 1.2 N
weak grip
20 mm 195 Gs
19.5 mT
0.04 kg / 0.10 lbs
43.9 g / 0.4 N
weak grip
30 mm 83 Gs
8.3 mT
0.01 kg / 0.02 lbs
8.0 g / 0.1 N
weak grip
50 mm 24 Gs
2.4 mT
0.00 kg / 0.00 lbs
0.6 g / 0.0 N
weak grip

Table 2: Sliding load (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 lbs
2370.0 g / 23.2 N
1 mm Stal (~0.2) 1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
2 mm Stal (~0.2) 1.28 kg / 2.81 lbs
1276.0 g / 12.5 N
3 mm Stal (~0.2) 0.89 kg / 1.95 lbs
886.0 g / 8.7 N
5 mm Stal (~0.2) 0.42 kg / 0.93 lbs
424.0 g / 4.2 N
10 mm Stal (~0.2) 0.09 kg / 0.19 lbs
86.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 lbs
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 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

Table 3: Wall mounting (shearing) - 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 lbs
3555.0 g / 34.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.37 kg / 5.22 lbs
2370.0 g / 23.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.19 kg / 2.61 lbs
1185.0 g / 11.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.93 kg / 13.06 lbs
5925.0 g / 58.1 N

Table 4: Steel thickness (saturation) - 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 lbs
592.5 g / 5.8 N
1 mm
13%
1.48 kg / 3.27 lbs
1481.3 g / 14.5 N
2 mm
25%
2.96 kg / 6.53 lbs
2962.5 g / 29.1 N
3 mm
38%
4.44 kg / 9.80 lbs
4443.8 g / 43.6 N
5 mm
63%
7.41 kg / 16.33 lbs
7406.3 g / 72.7 N
10 mm
100%
11.85 kg / 26.12 lbs
11850.0 g / 116.2 N
11 mm
100%
11.85 kg / 26.12 lbs
11850.0 g / 116.2 N
12 mm
100%
11.85 kg / 26.12 lbs
11850.0 g / 116.2 N

Table 5: Working in heat (material behavior) - thermal limit
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 lbs
11850.0 g / 116.2 N
OK
40 °C -2.2% 11.59 kg / 25.55 lbs
11589.3 g / 113.7 N
OK
60 °C -4.4% 11.33 kg / 24.98 lbs
11328.6 g / 111.1 N
80 °C -6.6% 11.07 kg / 24.40 lbs
11067.9 g / 108.6 N
100 °C -28.8% 8.44 kg / 18.60 lbs
8437.2 g / 82.8 N

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 40x10x5x2[7/3.5] / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 25.44 kg / 56.10 lbs
4 569 Gs
3.82 kg / 8.41 lbs
3817 g / 37.4 N
N/A
1 mm 22.33 kg / 49.22 lbs
6 018 Gs
3.35 kg / 7.38 lbs
3349 g / 32.9 N
20.09 kg / 44.30 lbs
~0 Gs
2 mm 19.21 kg / 42.36 lbs
5 582 Gs
2.88 kg / 6.35 lbs
2882 g / 28.3 N
17.29 kg / 38.12 lbs
~0 Gs
3 mm 16.31 kg / 35.96 lbs
5 144 Gs
2.45 kg / 5.39 lbs
2447 g / 24.0 N
14.68 kg / 32.36 lbs
~0 Gs
5 mm 11.45 kg / 25.23 lbs
4 309 Gs
1.72 kg / 3.78 lbs
1717 g / 16.8 N
10.30 kg / 22.71 lbs
~0 Gs
10 mm 4.56 kg / 10.05 lbs
2 719 Gs
0.68 kg / 1.51 lbs
684 g / 6.7 N
4.10 kg / 9.04 lbs
~0 Gs
20 mm 0.93 kg / 2.05 lbs
1 230 Gs
0.14 kg / 0.31 lbs
140 g / 1.4 N
0.84 kg / 1.85 lbs
~0 Gs
50 mm 0.04 kg / 0.08 lbs
249 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
0.03 kg / 0.08 lbs
~0 Gs
60 mm 0.02 kg / 0.04 lbs
167 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
0.02 kg / 0.03 lbs
~0 Gs
70 mm 0.01 kg / 0.02 lbs
116 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
84 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.01 lbs
62 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
48 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Hazards (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
Mechanical watch 20 Gs (2.0 mT) 5.5 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Car key 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

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.99 km/h
(8.05 m/s)
0.49 J
30 mm 49.12 km/h
(13.64 m/s)
1.40 J
50 mm 63.39 km/h
(17.61 m/s)
2.33 J
100 mm 89.64 km/h
(24.90 m/s)
4.65 J

Table 9: Anti-corrosion coating 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)

Table 10: Electrical data (Pc)
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)

Table 11: Hydrostatics and buoyancy
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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet retains just approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) significantly weakens 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) = 0.31

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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: 020397-2026
Measurement Calculator
Pulling force

Magnetic Induction

Other products

Model MPL 40x10x5x2[7/3.5] / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 11.85 kg), this product is available immediately from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects 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 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 generators and material handling systems. Thanks to the flat surface and high force (approx. 11.85 kg), they are ideal as closers in furniture making and mounting elements in automation. Customers often choose this model for hanging tools 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 40x10x5x2[7/3.5] / N38 model is magnetized through the thickness (dimension 5 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), 10 mm (width), and 5 mm (thickness). It is a magnetic block with dimensions 40x10x5 mm and a self-weight of 15 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of rare earth magnets.

Benefits

Apart from their strong magnetic energy, neodymium magnets have these key benefits:
  • They retain magnetic properties for almost 10 years – the drop is just ~1% (based on simulations),
  • Neodymium magnets remain extremely resistant to magnetic field loss caused by external interference,
  • By applying a shiny layer of nickel, the element presents an aesthetic look,
  • Neodymium magnets achieve maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • Thanks to flexibility in forming and the ability to adapt to client solutions,
  • Versatile presence in high-tech industry – they find application in hard drives, brushless drives, diagnostic systems, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in small systems

Cons

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these products can disrupt the diagnostic process medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Breakaway force was determined for ideal contact conditions, assuming:
  • using a base made of low-carbon steel, functioning as a ideal flux conductor
  • whose transverse dimension equals approx. 10 mm
  • characterized by smoothness
  • with total lack of distance (no coatings)
  • for force applied at a right angle (pull-off, not shear)
  • in stable room temperature

Determinants of lifting force in real conditions

Please note that the working load may be lower depending on elements below, in order of importance:
  • Clearance – existence of foreign body (paint, tape, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Steel type – mild steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
  • Surface finish – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.

Lifting capacity was assessed with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate decreases the load capacity.

Precautions when working with NdFeB magnets
Handling guide

Exercise caution. Rare earth magnets act from a long distance and snap with huge force, often faster than you can move away.

Keep away from children

Adult use only. Small elements can be swallowed, leading to serious injuries. Store away from kids and pets.

Electronic devices

Very strong magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.

Serious injuries

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

Machining danger

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Operating temperature

Standard neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. This process is irreversible.

Metal Allergy

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.

GPS and phone interference

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

Risk of cracking

Watch out for shards. Magnets can explode upon uncontrolled impact, launching shards into the air. Wear goggles.

ICD Warning

For implant holders: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or ask another person to work with the magnets.

Important! Looking for details? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98