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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 analysis of the assembly - data

The following information constitute the result of a physical simulation. Results are based on models for the material Nd2Fe14B. Actual performance might slightly differ. Please consider these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - 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 pounds
1600.0 g / 15.7 N
low risk
1 mm 2886 Gs
288.6 mT
0.94 kg / 2.07 pounds
939.5 g / 9.2 N
low risk
2 mm 2048 Gs
204.8 mT
0.47 kg / 1.04 pounds
472.8 g / 4.6 N
low risk
3 mm 1412 Gs
141.2 mT
0.22 kg / 0.50 pounds
224.8 g / 2.2 N
low risk
5 mm 686 Gs
68.6 mT
0.05 kg / 0.12 pounds
53.0 g / 0.5 N
low risk
10 mm 165 Gs
16.5 mT
0.00 kg / 0.01 pounds
3.1 g / 0.0 N
low risk
15 mm 60 Gs
6.0 mT
0.00 kg / 0.00 pounds
0.4 g / 0.0 N
low risk
20 mm 28 Gs
2.8 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
low risk
30 mm 9 Gs
0.9 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
low risk
50 mm 2 Gs
0.2 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
low risk

Table 2: Shear load (wall)
MPL 7x7x3 / N38

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

Table 3: Vertical assembly (sliding) - vertical pull
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 pounds
480.0 g / 4.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.16 kg / 0.35 pounds
160.0 g / 1.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.80 kg / 1.76 pounds
800.0 g / 7.8 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 7x7x3 / N38

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

Table 5: Thermal stability (material behavior) - 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 pounds
1600.0 g / 15.7 N
OK
40 °C -2.2% 1.56 kg / 3.45 pounds
1564.8 g / 15.4 N
OK
60 °C -4.4% 1.53 kg / 3.37 pounds
1529.6 g / 15.0 N
80 °C -6.6% 1.49 kg / 3.29 pounds
1494.4 g / 14.7 N
100 °C -28.8% 1.14 kg / 2.51 pounds
1139.2 g / 11.2 N

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 7x7x3 / N38

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

Table 7: Hazards (electronics) - precautionary measures
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: Impact energy (cracking risk) - collision effects
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: Electrical 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: Hydrostatics and buoyancy
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

*Caution: On a vertical wall, the magnet holds merely a fraction of its max power.

2. Steel thickness impact

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

3. Power loss vs temp

*For standard magnets, the critical 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.

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%
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: 020176-2026
Magnet Unit Converter
Magnet pull force

Field Strength

Check out more products

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 7x7x3 mm and a weight of 1.1 g, guarantees the highest quality connection. This magnetic block with a force of 15.70 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, 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 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. Thanks to the flat surface and high force (approx. 1.60 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 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).
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. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 7x7x3 mm, which, at a weight of 1.1 g, makes it an element with impressive energy density. 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 protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of rare earth magnets.

Advantages

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They retain their magnetic properties even under external field action,
  • A magnet with a metallic gold surface has an effective appearance,
  • They show high magnetic induction at the operating surface, making them more effective,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of precise shaping and adapting to complex applications,
  • Huge importance in innovative solutions – they are utilized in computer drives, motor assemblies, precision medical tools, as well as industrial machines.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Weaknesses

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We suggest a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated forms.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • With mass production the cost of neodymium magnets can be a barrier,

Lifting parameters

Best holding force of the magnet in ideal parameterswhat affects it?

The load parameter shown concerns the limit force, recorded under laboratory conditions, specifically:
  • using a plate made of low-carbon steel, serving as a circuit closing element
  • whose transverse dimension reaches at least 10 mm
  • with a surface free of scratches
  • under conditions of gap-free contact (surface-to-surface)
  • under vertical force direction (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

In practice, the actual lifting capacity depends on several key aspects, ranked from crucial:
  • Clearance – the presence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Base massiveness – too thin sheet does not close the flux, causing part of the power to be escaped to the other side.
  • Steel grade – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
  • Plate texture – smooth surfaces ensure maximum contact, which improves force. Rough surfaces weaken the grip.
  • Thermal environment – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

H&S for magnets
Flammability

Powder produced during cutting of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Bone fractures

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

Material brittleness

Despite the nickel coating, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Danger to pacemakers

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Immense force

Before use, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Nickel allergy

A percentage of the population suffer from a contact allergy to nickel, which is the standard coating for neodymium magnets. Extended handling might lead to an allergic reaction. We recommend wear safety gloves.

Danger to the youngest

Only for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from children and animals.

Keep away from electronics

GPS units and smartphones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Cards and drives

Powerful magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Permanent damage

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

Warning! More info about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98