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MPL 5x5x1.2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020171

GTIN/EAN: 5906301811770

5.00

length

5 mm [±0,1 mm]

Width

5 mm [±0,1 mm]

Height

1.2 mm [±0,1 mm]

Weight

0.22 g

Magnetization Direction

↑ axial

Load capacity

0.44 kg / 4.28 N

Magnetic Induction

245.17 mT / 2452 Gs

Coating

[NiCuNi] Nickel

0.1845 with VAT / pcs + price for transport

0.1500 ZŁ net + 23% VAT / pcs

bulk discounts:

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Detailed specification - MPL 5x5x1.2 / N38 - lamellar magnet

Specification / characteristics - MPL 5x5x1.2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020171
GTIN/EAN 5906301811770
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 5 mm [±0,1 mm]
Width 5 mm [±0,1 mm]
Height 1.2 mm [±0,1 mm]
Weight 0.22 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.44 kg / 4.28 N
Magnetic Induction ~ ? 245.17 mT / 2452 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 5x5x1.2 / 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 modeling of the assembly - technical parameters

The following values constitute the result of a mathematical calculation. Values are based on models for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs distance) - power drop
MPL 5x5x1.2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 2450 Gs
245.0 mT
0.44 kg / 440.0 g
4.3 N
safe
1 mm 1739 Gs
173.9 mT
0.22 kg / 221.8 g
2.2 N
safe
2 mm 1054 Gs
105.4 mT
0.08 kg / 81.4 g
0.8 N
safe
3 mm 622 Gs
62.2 mT
0.03 kg / 28.4 g
0.3 N
safe
5 mm 241 Gs
24.1 mT
0.00 kg / 4.3 g
0.0 N
safe
10 mm 45 Gs
4.5 mT
0.00 kg / 0.1 g
0.0 N
safe
15 mm 15 Gs
1.5 mT
0.00 kg / 0.0 g
0.0 N
safe
20 mm 7 Gs
0.7 mT
0.00 kg / 0.0 g
0.0 N
safe
30 mm 2 Gs
0.2 mT
0.00 kg / 0.0 g
0.0 N
safe
50 mm 0 Gs
0.0 mT
0.00 kg / 0.0 g
0.0 N
safe

Table 2: Shear capacity (vertical surface)
MPL 5x5x1.2 / N38

Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 0.09 kg / 88.0 g
0.9 N
1 mm Stal (~0.2) 0.04 kg / 44.0 g
0.4 N
2 mm Stal (~0.2) 0.02 kg / 16.0 g
0.2 N
3 mm Stal (~0.2) 0.01 kg / 6.0 g
0.1 N
5 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N

Table 3: Wall mounting (shearing) - vertical pull
MPL 5x5x1.2 / N38

Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.13 kg / 132.0 g
1.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.09 kg / 88.0 g
0.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.04 kg / 44.0 g
0.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.22 kg / 220.0 g
2.2 N

Table 4: Material efficiency (substrate influence) - power losses
MPL 5x5x1.2 / N38

Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.04 kg / 44.0 g
0.4 N
1 mm
25%
0.11 kg / 110.0 g
1.1 N
2 mm
50%
0.22 kg / 220.0 g
2.2 N
5 mm
100%
0.44 kg / 440.0 g
4.3 N
10 mm
100%
0.44 kg / 440.0 g
4.3 N

Table 5: Thermal resistance (stability) - resistance threshold
MPL 5x5x1.2 / N38

Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 0.44 kg / 440.0 g
4.3 N
OK
40 °C -2.2% 0.43 kg / 430.3 g
4.2 N
OK
60 °C -4.4% 0.42 kg / 420.6 g
4.1 N
80 °C -6.6% 0.41 kg / 411.0 g
4.0 N
100 °C -28.8% 0.31 kg / 313.3 g
3.1 N

Table 6: Two magnets (repulsion) - field collision
MPL 5x5x1.2 / N38

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 0.92 kg / 925 g
9.1 N
4 027 Gs
N/A
1 mm 0.70 kg / 699 g
6.9 N
4 260 Gs
0.63 kg / 629 g
6.2 N
~0 Gs
2 mm 0.47 kg / 466 g
4.6 N
3 478 Gs
0.42 kg / 420 g
4.1 N
~0 Gs
3 mm 0.29 kg / 288 g
2.8 N
2 734 Gs
0.26 kg / 259 g
2.5 N
~0 Gs
5 mm 0.10 kg / 101 g
1.0 N
1 617 Gs
0.09 kg / 91 g
0.9 N
~0 Gs
10 mm 0.01 kg / 9 g
0.1 N
482 Gs
0.00 kg / 0 g
0.0 N
~0 Gs
20 mm 0.00 kg / 0 g
0.0 N
90 Gs
0.00 kg / 0 g
0.0 N
~0 Gs
50 mm 0.00 kg / 0 g
0.0 N
7 Gs
0.00 kg / 0 g
0.0 N
~0 Gs

Table 7: Hazards (electronics) - warnings
MPL 5x5x1.2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 2.5 cm
Hearing aid 10 Gs (1.0 mT) 2.0 cm
Timepiece 20 Gs (2.0 mT) 1.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 1.5 cm
Car key 50 Gs (5.0 mT) 1.0 cm
Payment card 400 Gs (40.0 mT) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm

Table 8: Dynamics (cracking risk) - warning
MPL 5x5x1.2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 45.11 km/h
(12.53 m/s)
0.02 J
30 mm 78.12 km/h
(21.70 m/s)
0.05 J
50 mm 100.85 km/h
(28.01 m/s)
0.09 J
100 mm 142.63 km/h
(39.62 m/s)
0.17 J

Table 9: Coating parameters (durability)
MPL 5x5x1.2 / 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 5x5x1.2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 695 Mx 7.0 µWb
Pc Coefficient 0.30 Low (Flat)

Table 11: Physics of underwater searching
MPL 5x5x1.2 / N38

Environment Effective steel pull Effect
Air (land) 0.44 kg Standard
Water (riverbed) 0.50 kg
(+0.06 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. Sliding resistance

*Warning: On a vertical surface, the magnet holds merely approx. 20-30% of its max power.

2. Steel saturation

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

3. Temperature resistance

*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) = 0.30

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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%
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: 020171-2025
Measurement Calculator
Force (pull)

Field Strength

Other proposals

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 5x5x1.2 mm and a weight of 0.22 g, guarantees premium class connection. As a magnetic bar with high power (approx. 0.44 kg), this product is available off-the-shelf 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. Watch your fingers! Magnets with a force of 0.44 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 wind generators and material handling systems. Thanks to the flat surface and high force (approx. 0.44 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for workshop organization 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. 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 5x5x1.2 / N38 model is magnetized through the thickness (dimension 1.2 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 (5x5 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 5x5x1.2 mm, which, at a weight of 0.22 g, makes it an element with high energy density. It is a magnetic block with dimensions 5x5x1.2 mm and a self-weight of 0.22 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.

Pros

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • Their strength remains stable, and after approximately ten years it drops only by ~1% (according to research),
  • They maintain their magnetic properties even under external field action,
  • The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Considering the option of accurate forming and adaptation to individualized needs, NdFeB magnets can be created in a variety of shapes and sizes, which increases their versatility,
  • Wide application in high-tech industry – they serve a role in HDD drives, drive modules, precision medical tools, as well as technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Characteristics of disadvantages of neodymium magnets and ways of using them
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Due to limitations in creating threads and complex forms in magnets, we recommend using casing - magnetic mount.
  • Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these devices can be problematic in diagnostics medical in case of swallowing.
  • With mass production the cost of neodymium magnets can be a barrier,

Holding force characteristics

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

The lifting capacity listed is a measurement result executed under specific, ideal conditions:
  • with the contact of a yoke made of special test steel, guaranteeing maximum field concentration
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with an polished contact surface
  • with total lack of distance (without paint)
  • during detachment in a direction vertical to the mounting surface
  • in stable room temperature

Determinants of lifting force in real conditions

Effective lifting capacity is affected by specific conditions, mainly (from priority):
  • Distance – the presence of any layer (paint, tape, gap) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material type – ideal substrate is pure iron steel. Stainless steels may attract less.
  • Smoothness – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal factor – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Mechanical processing

Dust created during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Do not underestimate power

Be careful. Neodymium magnets attract from a distance and snap with huge force, often quicker than you can move away.

Eye protection

Neodymium magnets are ceramic materials, which means they are prone to chipping. Clashing of two magnets leads to them shattering into small pieces.

Heat sensitivity

Monitor thermal conditions. Heating the magnet to high heat will ruin its magnetic structure and pulling force.

Pacemakers

Life threat: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Nickel allergy

Medical facts indicate that nickel (standard magnet coating) is a potent allergen. If you have an allergy, refrain from touching magnets with bare hands and choose versions in plastic housing.

Swallowing risk

Adult use only. Small elements pose a choking risk, leading to serious injuries. Store out of reach of kids and pets.

Precision electronics

Be aware: rare earth magnets produce a field that interferes with sensitive sensors. Keep a safe distance from your mobile, device, and navigation systems.

Pinching danger

Large magnets can crush fingers instantly. Never place your hand betwixt two strong magnets.

Threat to electronics

Avoid bringing magnets close to a purse, laptop, or TV. The magnetism can permanently damage these devices and wipe information from cards.

Attention! Learn more about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98