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MPL 7x7x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020176

GTIN/EAN: 5906301811824

5.00

length

7 mm [±0,1 mm]

Width

7 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

1.1 g

Magnetization Direction

↑ axial

Load capacity

1.60 kg / 15.70 N

Magnetic Induction

376.99 mT / 3770 Gs

Coating

[NiCuNi] Nickel

0.541 with VAT / pcs + price for transport

0.440 ZŁ net + 23% VAT / pcs

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Product card - MPL 7x7x3 / N38 - lamellar magnet

Specification / characteristics - MPL 7x7x3 / N38 - lamellar magnet

properties
properties values
Cat. no. 020176
GTIN/EAN 5906301811824
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 7 mm [±0,1 mm]
Width 7 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 1.1 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.60 kg / 15.70 N
Magnetic Induction ~ ? 376.99 mT / 3770 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 7x7x3 / 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 simulation of the magnet - technical parameters

The following information represent the result of a physical analysis. Results are based on models for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Use these calculations as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - interaction chart
MPL 7x7x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3767 Gs
376.7 mT
1.60 kg / 3.53 lbs
1600.0 g / 15.7 N
safe
1 mm 2886 Gs
288.6 mT
0.94 kg / 2.07 lbs
939.5 g / 9.2 N
safe
2 mm 2048 Gs
204.8 mT
0.47 kg / 1.04 lbs
472.8 g / 4.6 N
safe
3 mm 1412 Gs
141.2 mT
0.22 kg / 0.50 lbs
224.8 g / 2.2 N
safe
5 mm 686 Gs
68.6 mT
0.05 kg / 0.12 lbs
53.0 g / 0.5 N
safe
10 mm 165 Gs
16.5 mT
0.00 kg / 0.01 lbs
3.1 g / 0.0 N
safe
15 mm 60 Gs
6.0 mT
0.00 kg / 0.00 lbs
0.4 g / 0.0 N
safe
20 mm 28 Gs
2.8 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
safe
30 mm 9 Gs
0.9 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe
50 mm 2 Gs
0.2 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe

Table 2: Shear force (vertical surface)
MPL 7x7x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.32 kg / 0.71 lbs
320.0 g / 3.1 N
1 mm Stal (~0.2) 0.19 kg / 0.41 lbs
188.0 g / 1.8 N
2 mm Stal (~0.2) 0.09 kg / 0.21 lbs
94.0 g / 0.9 N
3 mm Stal (~0.2) 0.04 kg / 0.10 lbs
44.0 g / 0.4 N
5 mm Stal (~0.2) 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 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

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 7x7x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.48 kg / 1.06 lbs
480.0 g / 4.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.32 kg / 0.71 lbs
320.0 g / 3.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.16 kg / 0.35 lbs
160.0 g / 1.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.80 kg / 1.76 lbs
800.0 g / 7.8 N

Table 4: Steel thickness (substrate influence) - power losses
MPL 7x7x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.16 kg / 0.35 lbs
160.0 g / 1.6 N
1 mm
25%
0.40 kg / 0.88 lbs
400.0 g / 3.9 N
2 mm
50%
0.80 kg / 1.76 lbs
800.0 g / 7.8 N
3 mm
75%
1.20 kg / 2.65 lbs
1200.0 g / 11.8 N
5 mm
100%
1.60 kg / 3.53 lbs
1600.0 g / 15.7 N
10 mm
100%
1.60 kg / 3.53 lbs
1600.0 g / 15.7 N
11 mm
100%
1.60 kg / 3.53 lbs
1600.0 g / 15.7 N
12 mm
100%
1.60 kg / 3.53 lbs
1600.0 g / 15.7 N

Table 5: Thermal stability (stability) - thermal limit
MPL 7x7x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.60 kg / 3.53 lbs
1600.0 g / 15.7 N
OK
40 °C -2.2% 1.56 kg / 3.45 lbs
1564.8 g / 15.4 N
OK
60 °C -4.4% 1.53 kg / 3.37 lbs
1529.6 g / 15.0 N
80 °C -6.6% 1.49 kg / 3.29 lbs
1494.4 g / 14.7 N
100 °C -28.8% 1.14 kg / 2.51 lbs
1139.2 g / 11.2 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 7x7x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.29 kg / 9.45 lbs
5 173 Gs
0.64 kg / 1.42 lbs
643 g / 6.3 N
N/A
1 mm 3.38 kg / 7.44 lbs
6 685 Gs
0.51 kg / 1.12 lbs
506 g / 5.0 N
3.04 kg / 6.70 lbs
~0 Gs
2 mm 2.52 kg / 5.55 lbs
5 773 Gs
0.38 kg / 0.83 lbs
378 g / 3.7 N
2.27 kg / 4.99 lbs
~0 Gs
3 mm 1.81 kg / 3.99 lbs
4 893 Gs
0.27 kg / 0.60 lbs
271 g / 2.7 N
1.63 kg / 3.59 lbs
~0 Gs
5 mm 0.88 kg / 1.93 lbs
3 405 Gs
0.13 kg / 0.29 lbs
131 g / 1.3 N
0.79 kg / 1.74 lbs
~0 Gs
10 mm 0.14 kg / 0.31 lbs
1 372 Gs
0.02 kg / 0.05 lbs
21 g / 0.2 N
0.13 kg / 0.28 lbs
~0 Gs
20 mm 0.01 kg / 0.02 lbs
329 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
30 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
18 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
12 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
8 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
6 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
4 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Safety (HSE) (electronics) - warnings
MPL 7x7x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.0 cm
Hearing aid 10 Gs (1.0 mT) 3.0 cm
Timepiece 20 Gs (2.0 mT) 2.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.0 cm
Car key 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Collisions (kinetic energy) - warning
MPL 7x7x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 38.51 km/h
(10.70 m/s)
0.06 J
30 mm 66.62 km/h
(18.51 m/s)
0.19 J
50 mm 86.01 km/h
(23.89 m/s)
0.31 J
100 mm 121.63 km/h
(33.79 m/s)
0.63 J

Table 9: Anti-corrosion coating durability
MPL 7x7x3 / 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 7x7x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 909 Mx 19.1 µWb
Pc Coefficient 0.48 Low (Flat)

Table 11: Physics of underwater searching
MPL 7x7x3 / N38

Environment Effective steel pull Effect
Air (land) 1.60 kg Standard
Water (riverbed) 1.83 kg
(+0.23 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) significantly reduces 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) = 0.48

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
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%
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: 020176-2026
Measurement Calculator
Pulling force

Magnetic Induction

Other offers

This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 7x7x3 mm and a weight of 1.1 g, guarantees the highest quality connection. As a block magnet with high power (approx. 1.60 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.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 7x7x3 / 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 wind 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 7x7x3 / N38, it is best to use 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 7x7x3 / N38 model is magnetized through the thickness (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. 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: 7 mm (length), 7 mm (width), and 3 mm (thickness). It is a magnetic block with dimensions 7x7x3 mm and a self-weight of 1.1 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of neodymium magnets.

Benefits

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even after around 10 years – the drop in power is only ~1% (according to tests),
  • They have excellent resistance to magnetism drop due to external fields,
  • A magnet with a shiny silver surface has better aesthetics,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to freedom in forming and the capacity to modify to unusual requirements,
  • Fundamental importance in modern industrial fields – they are used in data components, electric motors, medical equipment, and other advanced devices.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in producing threads and complicated forms in magnets, we propose using casing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these products can complicate diagnosis medical in case of swallowing.
  • With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what affects it?

The lifting capacity listed is a measurement result conducted under the following configuration:
  • with the use of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • whose transverse dimension is min. 10 mm
  • with an polished contact surface
  • with direct contact (without impurities)
  • during detachment in a direction vertical to the plane
  • at ambient temperature room level

Determinants of practical lifting force of a magnet

Effective lifting capacity is affected by specific conditions, mainly (from priority):
  • Gap (between the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, rust or dirt).
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Surface finish – full contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.

Warnings
Dust explosion hazard

Powder created during grinding of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Respect the power

Use magnets with awareness. Their immense force can surprise even professionals. Stay alert and respect their power.

Skin irritation risks

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If an allergic reaction occurs, immediately stop working with magnets and wear gloves.

Serious injuries

Watch your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Medical implants

Life threat: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Protect data

Avoid bringing magnets close to a wallet, computer, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Material brittleness

Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Power loss in heat

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

Magnetic interference

GPS units and mobile phones are highly susceptible to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Adults only

Product intended for adults. Tiny parts pose a choking risk, causing intestinal necrosis. Keep out of reach of children and animals.

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