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MPL 40x15x6 / N38 - lamellar magnet

lamellar magnet

Catalog no 020155

GTIN/EAN: 5906301811619

5.00
Load capacity 14.21 kg / 139.45 N Magnetic Induction 286.36 mT / 2864 Gs
length
40 mm [±0,1 mm]
Width
15 mm [±0,1 mm]
Height
6 mm [±0,1 mm]
Weight
27 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

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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Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Detailed specification - 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 310 °C
Curie Temperature TF 590 °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 magnet - data

The following data constitute the outcome of a mathematical calculation. Results are based on models for the material Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static force (pull vs gap) - interaction chart
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
crushing
1 mm 2635 Gs
263.5 mT
12.04 kg / 26.55 lbs
12041.8 g / 118.1 N
crushing
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: Sliding hold (vertical surface)
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: Vertical assembly (shearing) - 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 (material behavior) - thermal limit
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: Two magnets (repulsion) - field range
MPL 40x15x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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: Hazards (implants) - warnings
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
Mechanical watch 20 Gs (2.0 mT) 7.0 cm
Mobile device 40 Gs (4.0 mT) 5.5 cm
Car key 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 (kinetic energy) - warning
MPL 40x15x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.64 km/h
(6.57 m/s)
0.58 J
30 mm 24.91 km/h
(6.92 m/s)
0.65 J
50 mm 24.95 km/h
(6.93 m/s)
0.65 J
100 mm 24.96 km/h
(6.93 m/s)
0.65 J

Table 9: Anti-corrosion coating durability
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: Construction data (Flux)
MPL 40x15x6 / N38

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

Table 11: Physics of underwater searching
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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds merely approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely reduces the holding force.

3. Thermal stability

*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 specification and ecology

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: 020155-2026
Magnet Unit Converter

Pulling force


Magnetic Field

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Model MPL 40x15x6 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. This magnetic 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.
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. 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.
Plate magnets MPL 40x15x6 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 14.21 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 40x15x6 / N38, we recommend utilizing strong epoxy glues (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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 40x15x6 / N38 model is magnetized axially (dimension 6 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 (40x15 mm), which is ideal for flat mounting. 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), 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 grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of Nd2Fe14B magnets.

Benefits

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They retain attractive force for nearly 10 years – the drop is just ~1% (based on simulations),
  • They do not lose their magnetic properties even under external field action,
  • By covering with a lustrous layer of gold, the element presents an professional look,
  • Magnetic induction on the working part of the magnet is impressive,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of accurate forming as well as adjusting to individual applications,
  • Huge importance in modern industrial fields – they are commonly used in HDD drives, electric drive systems, advanced medical instruments, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in compact constructions

Cons

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of creating threads in the magnet and complex shapes - preferred is casing - mounting mechanism.
  • Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
  • Due to expensive raw materials, their price is higher than average,

Lifting parameters

Maximum magnetic pulling forcewhat contributes to it?

Information about lifting capacity was defined for the most favorable conditions, taking into account:
  • with the contact of a yoke made of special test steel, ensuring full magnetic saturation
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • under conditions of ideal adhesion (metal-to-metal)
  • for force acting at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Key elements affecting lifting force

In practice, the actual lifting capacity results from several key aspects, ranked from most significant:
  • Air gap (betwixt the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, rust or debris).
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity was determined by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Conscious usage

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Keep away from electronics

Be aware: neodymium magnets generate a field that confuses precision electronics. Keep a safe distance from your phone, device, and navigation systems.

Do not overheat magnets

Avoid heat. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Health Danger

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

Magnet fragility

Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Keep away from computers

Equipment safety: Strong magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, timepieces).

Nickel allergy

A percentage of the population have a contact allergy to Ni, which is the typical protective layer for neodymium magnets. Frequent touching can result in skin redness. We recommend use safety gloves.

Pinching danger

Danger of trauma: The attraction force is so immense that it can cause hematomas, pinching, and broken bones. Use thick gloves.

Fire warning

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

Do not give to children

Absolutely store magnets away from children. Ingestion danger is high, and the effects of magnets clamping inside the body are fatal.

Attention! More info about risks in the article: Magnet Safety Guide.