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MPL 50x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020473

GTIN/EAN: 5906301811930

5.00
Load capacity 12.69 kg / 124.48 N Magnetic Induction 197.73 mT / 1977 Gs
length
50 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
37.5 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical details »

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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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Product card - MPL 50x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 50x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020473
GTIN/EAN 5906301811930
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 50 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 37.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 12.69 kg / 124.48 N
Magnetic Induction ~ ? 197.73 mT / 1977 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x5 / 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 analysis of the magnet - data

These information constitute the direct effect of a mathematical analysis. Values were calculated on algorithms for the class Nd2Fe14B. Operational parameters might slightly differ. Treat these calculations as a supplementary guide for designers.

Table 1: Static force (pull vs gap) - power drop
MPL 50x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1977 Gs
197.7 mT
 12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
 critical level
1 mm 1885 Gs
188.5 mT
 11.53 kg / 25.42 lbs
11530.3 g / 113.1 N
 critical level
2 mm 1772 Gs
177.2 mT
 10.20 kg / 22.49 lbs
10199.9 g / 100.1 N
 critical level
3 mm 1649 Gs
164.9 mT
 8.83 kg / 19.47 lbs
8831.3 g / 86.6 N
 strong
5 mm 1395 Gs
139.5 mT
 6.32 kg / 13.93 lbs
6320.3 g / 62.0 N
 strong
10 mm 870 Gs
87.0 mT
 2.46 kg / 5.42 lbs
2459.4 g / 24.1 N
 strong
15 mm 549 Gs
54.9 mT
 0.98 kg / 2.15 lbs
976.9 g / 9.6 N
 safe
20 mm 359 Gs
35.9 mT
 0.42 kg / 0.92 lbs
418.9 g / 4.1 N
 safe
30 mm 172 Gs
17.2 mT
 0.10 kg / 0.21 lbs
95.7 g / 0.9 N
 safe
50 mm 54 Gs
5.4 mT
 0.01 kg / 0.02 lbs
9.5 g / 0.1 N
 safe
Grip strength decreases significantly with every mm of gap. Remember that even a microscopic distance (e.g., dirt, paint, veneer) noticeably weakens the grip. Magnetic products work optimally at the point of direct contact; distance drastically cuts the force. Notice how rapidly the parameters plummet, when the magnet does not adhere flatly to the metal substrate. When designing the assembly, eliminate unnecessary gaps.

Table 2: Shear force (wall)
MPL 50x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.54 kg / 5.60 lbs
2538.0 g / 24.9 N
1 mm Stal (~0.2) 2.31 kg / 5.08 lbs
2306.0 g / 22.6 N
2 mm Stal (~0.2) 2.04 kg / 4.50 lbs
2040.0 g / 20.0 N
3 mm Stal (~0.2) 1.77 kg / 3.89 lbs
1766.0 g / 17.3 N
5 mm Stal (~0.2) 1.26 kg / 2.79 lbs
1264.0 g / 12.4 N
10 mm Stal (~0.2) 0.49 kg / 1.08 lbs
492.0 g / 4.8 N
15 mm Stal (~0.2) 0.20 kg / 0.43 lbs
196.0 g / 1.9 N
20 mm Stal (~0.2) 0.08 kg / 0.19 lbs
84.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
This section presents the approximate force necessary to start the slippage of the magnet downwards against a upright steel plate (assuming typical friction). This parameter varies with the air gap between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 50x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.81 kg / 8.39 lbs
3807.0 g / 37.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.54 kg / 5.60 lbs
2538.0 g / 24.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.27 kg / 2.80 lbs
1269.0 g / 12.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.35 kg / 13.99 lbs
6345.0 g / 62.2 N
When mounting a element on a upright surface (e.g., a fridge), it you can count on barely approx. 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient mean that holders move down easier than they detach. Planning a hanger? Remember that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the element will slip down under a significantly smaller weight. Application of an anti-slip pad can effectively raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 50x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.63 kg / 1.40 lbs
634.5 g / 6.2 N
1 mm
13%
 1.59 kg / 3.50 lbs
1586.3 g / 15.6 N
2 mm
25%
 3.17 kg / 6.99 lbs
3172.5 g / 31.1 N
3 mm
38%
 4.76 kg / 10.49 lbs
4758.8 g / 46.7 N
5 mm
63%
 7.93 kg / 17.49 lbs
7931.2 g / 77.8 N
10 mm
100%
 12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
11 mm
100%
 12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
12 mm
100%
 12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
A thin sheet is unable to take in the entire magnetic field, which weakens actual performance of the holder. Should you attach a powerful product to a thin surface, the magnetism will penetrate right through and the attraction force will be weaker. To utilize the maximum of this magnet's power, you need a suitably thick piece of steel. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the holder shows lower pull force. We advise picking the steel cross-section based on the following data.

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 50x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
 OK
40 °C -2.2% 12.41 kg / 27.36 lbs
12410.8 g / 121.8 N
 OK
60 °C -4.4% 12.13 kg / 26.75 lbs
12131.6 g / 119.0 N
80 °C -6.6% 11.85 kg / 26.13 lbs
11852.5 g / 116.3 N
100 °C -28.8% 9.04 kg / 19.92 lbs
9035.3 g / 88.6 N
Ordinary NdFeB products lose power past the thermal threshold. Avoid high temperatures – excessive heat can irreversibly demagnetize this product. With every degree above norm, the magnet's force momentarily drops. Refrain from using this magnet close to ovens higher than its working range. Ignoring the limit will cause permanent loss of magnetism.
*Engineering note: Temperature resistance is determined by both grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) risk losing magnetic properties sooner than taller cylinders. Red status in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 50x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 24.10 kg / 53.12 lbs
3 371 Gs
3.61 kg / 7.97 lbs
3614 g / 35.5 N
 N/A
1 mm 23.06 kg / 50.84 lbs
3 868 Gs
3.46 kg / 7.63 lbs
3459 g / 33.9 N
 20.75 kg / 45.75 lbs
~0 Gs
2 mm 21.89 kg / 48.27 lbs
3 769 Gs
3.28 kg / 7.24 lbs
3284 g / 32.2 N
 19.71 kg / 43.44 lbs
~0 Gs
3 mm 20.65 kg / 45.53 lbs
3 661 Gs
3.10 kg / 6.83 lbs
3098 g / 30.4 N
 18.59 kg / 40.98 lbs
~0 Gs
5 mm 18.07 kg / 39.83 lbs
3 424 Gs
2.71 kg / 5.97 lbs
2710 g / 26.6 N
 16.26 kg / 35.84 lbs
~0 Gs
10 mm 12.00 kg / 26.46 lbs
2 790 Gs
1.80 kg / 3.97 lbs
1800 g / 17.7 N
 10.80 kg / 23.81 lbs
~0 Gs
20 mm 4.67 kg / 10.30 lbs
1 741 Gs
0.70 kg / 1.54 lbs
701 g / 6.9 N
 4.20 kg / 9.27 lbs
~0 Gs
50 mm 0.37 kg / 0.81 lbs
488 Gs
0.06 kg / 0.12 lbs
55 g / 0.5 N
 0.33 kg / 0.73 lbs
~0 Gs
60 mm 0.18 kg / 0.40 lbs
343 Gs
0.03 kg / 0.06 lbs
27 g / 0.3 N
 0.16 kg / 0.36 lbs
~0 Gs
70 mm 0.10 kg / 0.21 lbs
248 Gs
0.01 kg / 0.03 lbs
14 g / 0.1 N
 0.09 kg / 0.19 lbs
~0 Gs
80 mm 0.05 kg / 0.12 lbs
184 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
 0.05 kg / 0.10 lbs
~0 Gs
90 mm 0.03 kg / 0.07 lbs
140 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
100 mm 0.02 kg / 0.04 lbs
108 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
Two magnetic products attract each other from a much further distance than a magnet and steel combination. Such a system of two magnets generates a stronger field and a further horizon of performance. Want to build a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Remember that when connecting a pair of magnets, the pinch force is huge. The repulsion force is a bit weaker than the attraction, but still significant.
*The magnetic induction between like poles is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Important: Results demonstrate friction force of two identical magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - precautionary measures
MPL 50x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.5 cm
Hearing aid 10 Gs (1.0 mT) 9.5 cm
Mechanical watch 20 Gs (2.0 mT) 7.5 cm
Mobile device 40 Gs (4.0 mT) 6.0 cm
Remote 50 Gs (5.0 mT) 5.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field is a serious hazard to electronic devices as well as medical implants. These neodymiums produce a flux that prevents correct functioning of digital equipment. Be aware: the unseen radiation penetrates the body and glass. Exceptional care must be taken by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MPL 50x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.52 km/h
(5.98 m/s)
 0.67 J
30 mm 23.53 km/h
(6.54 m/s)
 0.80 J
50 mm 23.63 km/h
(6.56 m/s)
 0.81 J
100 mm 23.65 km/h
(6.57 m/s)
 0.81 J
Neodymium magnets are very brittle – a violent impact against metal risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or painful pinches to fingers. Always hold the magnet during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Surface protection spec
MPL 50x20x5 / 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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MPL 50x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 20 792 Mx 207.9 µWb
Pc Coefficient 0.21 Low (Flat)
Flux value passing through the magnet pole. Essential parameter for generator designers as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MPL 50x20x5 / N38

Environment Effective steel pull Effect
Air (land) 12.69 kg Standard
Water (riverbed) 14.53 kg
(+1.84 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.
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.

1. Sliding resistance

*Note: On a vertical wall, the magnet retains just ~20% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Temperature resistance

*For N38 grade, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.21

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%

Environmental data

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: 020473-2026
Measurement Calculator

Force (pull)

Field Strength

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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 50x20x5 mm and a weight of 37.5 g, guarantees premium class connection. This rectangular block with a force of 124.48 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, 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 50x20x5 / 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.
Plate magnets MPL 50x20x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 12.69 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
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. Remember to clean and degrease 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: 50 mm (length), 20 mm (width), and 5 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 12.69 kg (force ~124.48 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of rare earth magnets.

Pros

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They have constant strength, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
  • They possess excellent resistance to weakening of magnetic properties as a result of external magnetic sources,
  • A magnet with a metallic silver surface has an effective appearance,
  • Neodymium magnets deliver maximum magnetic induction on a their surface, which increases force concentration,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of detailed shaping and adjusting to individual applications,
  • Key role in modern industrial fields – they are commonly used in computer drives, brushless drives, medical equipment, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in miniature devices

Weaknesses

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 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 stable to moisture, when using outdoors
  • Limited ability of making threads in the magnet and complicated forms - preferred is casing - mounting mechanism.
  • Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Detachment force of the magnet in optimal conditions – what it depends on?

Information about lifting capacity is the result of a measurement for the most favorable conditions, including:
  • using a plate made of mild steel, acting as a magnetic yoke
  • whose transverse dimension is min. 10 mm
  • with an ideally smooth touching surface
  • under conditions of no distance (surface-to-surface)
  • during pulling in a direction perpendicular to the plane
  • at conditions approx. 20°C

Practical aspects of lifting capacity – factors

In practice, the actual holding force results from a number of factors, listed from most significant:
  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Base massiveness – insufficiently thick sheet causes magnetic saturation, causing part of the flux to be escaped to the other side.
  • Material type – ideal substrate is high-permeability steel. Stainless steels may attract less.
  • Surface quality – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

H&S for magnets
Threat to electronics

Very strong magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Maintain a gap of min. 10 cm.

Eye protection

Protect your eyes. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Combustion hazard

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Respect the power

Before use, read the rules. Sudden snapping can break the magnet or injure your hand. Be predictive.

Impact on smartphones

A strong magnetic field interferes with the functioning of compasses in smartphones and GPS navigation. Maintain magnets close to a device to avoid damaging the sensors.

Metal Allergy

A percentage of the population suffer from a hypersensitivity to nickel, which is the standard coating for neodymium magnets. Prolonged contact might lead to an allergic reaction. We suggest wear protective gloves.

Adults only

NdFeB magnets are not toys. Accidental ingestion of several magnets can lead to them pinching intestinal walls, which poses a critical condition and requires urgent medical intervention.

Finger safety

Big blocks can smash fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Pacemakers

Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Permanent damage

Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. Damage is permanent.

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