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MPL 40x15x6 / N38 - lamellar magnet

lamellar magnet

Catalog no 020155

GTIN/EAN: 5906301811619

5.00

length

40 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

6 mm [±0,1 mm]

Weight

27 g

Magnetization Direction

↑ axial

Load capacity

14.21 kg / 139.45 N

Magnetic Induction

286.36 mT / 2864 Gs

Coating

[NiCuNi] Nickel

18.45 with VAT / pcs + price for transport

15.00 ZŁ net + 23% VAT / pcs

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Technical details - MPL 40x15x6 / N38 - lamellar magnet

Specification / characteristics - MPL 40x15x6 / N38 - lamellar magnet

properties
properties values
Cat. no. 020155
GTIN/EAN 5906301811619
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 15 mm [±0,1 mm]
Height 6 mm [±0,1 mm]
Weight 27 g
Magnetization Direction ↑ axial
Load capacity ~ ? 14.21 kg / 139.45 N
Magnetic Induction ~ ? 286.36 mT / 2864 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x15x6 / 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 product - technical parameters

The following values constitute the result of a mathematical simulation. Results are based on algorithms for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Use these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - power drop
MPL 40x15x6 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2863 Gs
286.3 mT
14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
critical level
1 mm 2635 Gs
263.5 mT
12.04 kg / 26.55 lbs
12041.8 g / 118.1 N
critical level
2 mm 2385 Gs
238.5 mT
9.86 kg / 21.74 lbs
9859.1 g / 96.7 N
warning
3 mm 2132 Gs
213.2 mT
7.88 kg / 17.37 lbs
7880.1 g / 77.3 N
warning
5 mm 1670 Gs
167.0 mT
4.84 kg / 10.66 lbs
4837.1 g / 47.5 N
warning
10 mm 903 Gs
90.3 mT
1.41 kg / 3.11 lbs
1412.2 g / 13.9 N
weak grip
15 mm 520 Gs
52.0 mT
0.47 kg / 1.03 lbs
469.2 g / 4.6 N
weak grip
20 mm 320 Gs
32.0 mT
0.18 kg / 0.39 lbs
177.7 g / 1.7 N
weak grip
30 mm 141 Gs
14.1 mT
0.03 kg / 0.08 lbs
34.5 g / 0.3 N
weak grip
50 mm 41 Gs
4.1 mT
0.00 kg / 0.01 lbs
3.0 g / 0.0 N
weak grip

Table 2: Vertical force (wall)
MPL 40x15x6 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.84 kg / 6.27 lbs
2842.0 g / 27.9 N
1 mm Stal (~0.2) 2.41 kg / 5.31 lbs
2408.0 g / 23.6 N
2 mm Stal (~0.2) 1.97 kg / 4.35 lbs
1972.0 g / 19.3 N
3 mm Stal (~0.2) 1.58 kg / 3.47 lbs
1576.0 g / 15.5 N
5 mm Stal (~0.2) 0.97 kg / 2.13 lbs
968.0 g / 9.5 N
10 mm Stal (~0.2) 0.28 kg / 0.62 lbs
282.0 g / 2.8 N
15 mm Stal (~0.2) 0.09 kg / 0.21 lbs
94.0 g / 0.9 N
20 mm Stal (~0.2) 0.04 kg / 0.08 lbs
36.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 40x15x6 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.26 kg / 9.40 lbs
4263.0 g / 41.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.84 kg / 6.27 lbs
2842.0 g / 27.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.42 kg / 3.13 lbs
1421.0 g / 13.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.11 kg / 15.66 lbs
7105.0 g / 69.7 N

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 40x15x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.71 kg / 1.57 lbs
710.5 g / 7.0 N
1 mm
13%
1.78 kg / 3.92 lbs
1776.3 g / 17.4 N
2 mm
25%
3.55 kg / 7.83 lbs
3552.5 g / 34.9 N
3 mm
38%
5.33 kg / 11.75 lbs
5328.8 g / 52.3 N
5 mm
63%
8.88 kg / 19.58 lbs
8881.3 g / 87.1 N
10 mm
100%
14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
11 mm
100%
14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
12 mm
100%
14.21 kg / 31.33 lbs
14210.0 g / 139.4 N

Table 5: Working in heat (stability) - power drop
MPL 40x15x6 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
OK
40 °C -2.2% 13.90 kg / 30.64 lbs
13897.4 g / 136.3 N
OK
60 °C -4.4% 13.58 kg / 29.95 lbs
13584.8 g / 133.3 N
80 °C -6.6% 13.27 kg / 29.26 lbs
13272.1 g / 130.2 N
100 °C -28.8% 10.12 kg / 22.31 lbs
10117.5 g / 99.3 N

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 40x15x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 30.32 kg / 66.84 lbs
4 334 Gs
4.55 kg / 10.03 lbs
4547 g / 44.6 N
N/A
1 mm 28.06 kg / 61.86 lbs
5 508 Gs
4.21 kg / 9.28 lbs
4209 g / 41.3 N
25.25 kg / 55.67 lbs
~0 Gs
2 mm 25.69 kg / 56.64 lbs
5 271 Gs
3.85 kg / 8.50 lbs
3854 g / 37.8 N
23.12 kg / 50.97 lbs
~0 Gs
3 mm 23.33 kg / 51.43 lbs
5 023 Gs
3.50 kg / 7.71 lbs
3499 g / 34.3 N
21.00 kg / 46.29 lbs
~0 Gs
5 mm 18.85 kg / 41.56 lbs
4 515 Gs
2.83 kg / 6.23 lbs
2828 g / 27.7 N
16.97 kg / 37.40 lbs
~0 Gs
10 mm 10.32 kg / 22.75 lbs
3 341 Gs
1.55 kg / 3.41 lbs
1548 g / 15.2 N
9.29 kg / 20.48 lbs
~0 Gs
20 mm 3.01 kg / 6.64 lbs
1 805 Gs
0.45 kg / 1.00 lbs
452 g / 4.4 N
2.71 kg / 5.98 lbs
~0 Gs
50 mm 0.16 kg / 0.35 lbs
416 Gs
0.02 kg / 0.05 lbs
24 g / 0.2 N
0.14 kg / 0.32 lbs
~0 Gs
60 mm 0.07 kg / 0.16 lbs
282 Gs
0.01 kg / 0.02 lbs
11 g / 0.1 N
0.07 kg / 0.15 lbs
~0 Gs
70 mm 0.04 kg / 0.08 lbs
199 Gs
0.01 kg / 0.01 lbs
5 g / 0.1 N
0.03 kg / 0.07 lbs
~0 Gs
80 mm 0.02 kg / 0.04 lbs
144 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
0.02 kg / 0.04 lbs
~0 Gs
90 mm 0.01 kg / 0.02 lbs
108 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
0.01 kg / 0.02 lbs
~0 Gs
100 mm 0.01 kg / 0.01 lbs
83 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Protective zones (implants) - precautionary measures
MPL 40x15x6 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.0 cm
Hearing aid 10 Gs (1.0 mT) 8.5 cm
Timepiece 20 Gs (2.0 mT) 7.0 cm
Mobile device 40 Gs (4.0 mT) 5.5 cm
Remote 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Dynamics (cracking risk) - warning
MPL 40x15x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.53 km/h
(6.81 m/s)
0.63 J
30 mm 40.13 km/h
(11.15 m/s)
1.68 J
50 mm 51.74 km/h
(14.37 m/s)
2.79 J
100 mm 73.16 km/h
(20.32 m/s)
5.58 J

Table 9: Corrosion resistance
MPL 40x15x6 / 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 40x15x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 905 Mx 169.0 µWb
Pc Coefficient 0.31 Low (Flat)

Table 11: Underwater work (magnet fishing)
MPL 40x15x6 / N38

Environment Effective steel pull Effect
Air (land) 14.21 kg Standard
Water (riverbed) 16.27 kg
(+2.06 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Shear force

*Warning: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Power loss vs temp

*For N38 material, 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

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.

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%
Ecology and recycling (GPSR)
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: 020155-2026
Quick Unit Converter
Force (pull)

Magnetic Induction

Other products

This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 40x15x6 mm and a weight of 27 g, guarantees premium class connection. This rectangular block with a force of 139.45 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 14.21 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 fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 40x15x6 / N38, we recommend utilizing strong epoxy glues (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 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), 15 mm (width), and 6 mm (thickness). The key parameter here is the holding force amounting to approximately 14.21 kg (force ~139.45 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Pros as well as cons of Nd2Fe14B magnets.

Strengths

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • Magnets effectively defend themselves against loss of magnetization caused by foreign field sources,
  • By applying a shiny layer of nickel, the element gains an proper look,
  • Magnets exhibit excellent magnetic induction on the outer side,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of detailed shaping and adjusting to concrete conditions,
  • Fundamental importance in modern industrial fields – they are commonly used in computer drives, electromotive mechanisms, medical equipment, as well as other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons

Problematic aspects of neodymium magnets: tips and applications.
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • 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.
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of making nuts in the magnet and complicated shapes - preferred is a housing - magnet mounting.
  • Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, small elements of these devices can disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Best holding force of the magnet in ideal parameterswhat contributes to it?

The lifting capacity listed is a measurement result conducted under standard conditions:
  • on a base made of structural steel, effectively closing the magnetic flux
  • with a cross-section no less than 10 mm
  • with a surface free of scratches
  • under conditions of ideal adhesion (metal-to-metal)
  • under vertical force direction (90-degree angle)
  • at standard ambient temperature

Lifting capacity in practice – influencing factors

Real force is affected by specific conditions, including (from most important):
  • Clearance – the presence of any layer (rust, tape, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Steel thickness – too thin steel causes magnetic saturation, causing part of the flux to be escaped to the other side.
  • Metal type – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
  • Smoothness – full contact is possible only on polished steel. Rough texture create air cushions, reducing force.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was determined with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Safety rules for work with NdFeB magnets
Danger to pacemakers

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or request help to handle the magnets.

Keep away from computers

Very strong magnetic fields can erase data on credit cards, HDDs, and storage devices. Maintain a gap of min. 10 cm.

Shattering risk

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Combustion hazard

Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this may cause fire.

Warning for allergy sufferers

It is widely known that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands or choose versions in plastic housing.

Heat warning

Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

GPS and phone interference

Remember: rare earth magnets generate a field that disrupts sensitive sensors. Keep a separation from your mobile, device, and GPS.

Safe operation

Before use, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Bodily injuries

Large magnets can crush fingers in a fraction of a second. Under no circumstances put your hand betwixt two attracting surfaces.

Product not for children

Product intended for adults. Small elements can be swallowed, causing severe trauma. Keep away from kids and pets.

Warning! Learn more about risks in the article: Magnet Safety Guide.