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MPL 50x30x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020497

GTIN/EAN: 5906301814955

length

50 mm [±0,1 mm]

Width

30 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

45 g

Magnetization Direction

↑ axial

Load capacity

7.57 kg / 74.26 N

Magnetic Induction

120.04 mT / 1200 Gs

Coating

[NiCuNi] Nickel

see parameters »

25.83 ZŁ with VAT / pcs + price for transport

21.00 ZŁ net + 23% VAT / pcs

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Force along with structure of a magnet can be checked with our force calculator.

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Technical data of the product - MPL 50x30x4 / N38 - lamellar magnet

Specification / characteristics - MPL 50x30x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020497
GTIN/EAN 5906301814955
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 30 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 45 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.57 kg / 74.26 N
Magnetic Induction ~ ? 120.04 mT / 1200 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x30x4 / 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 assembly - data

These data are the direct effect of a physical analysis. Results rely on algorithms for the material Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Please consider these calculations as a reference point when designing systems.

Table 1: Static force (force vs gap) - power drop
MPL 50x30x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1200 Gs
120.0 mT
 7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
 warning
1 mm 1176 Gs
117.6 mT
 7.27 kg / 16.03 LBS
7270.9 g / 71.3 N
 warning
2 mm 1144 Gs
114.4 mT
 6.88 kg / 15.16 LBS
6877.1 g / 67.5 N
 warning
3 mm 1105 Gs
110.5 mT
 6.41 kg / 14.14 LBS
6414.7 g / 62.9 N
 warning
5 mm 1012 Gs
101.2 mT
 5.38 kg / 11.86 LBS
5381.2 g / 52.8 N
 warning
10 mm 754 Gs
75.4 mT
 2.99 kg / 6.59 LBS
2990.1 g / 29.3 N
 warning
15 mm 535 Gs
53.5 mT
 1.50 kg / 3.31 LBS
1503.5 g / 14.7 N
 low risk
20 mm 376 Gs
37.6 mT
 0.74 kg / 1.64 LBS
743.3 g / 7.3 N
 low risk
30 mm 193 Gs
19.3 mT
 0.20 kg / 0.43 LBS
195.8 g / 1.9 N
 low risk
50 mm 64 Gs
6.4 mT
 0.02 kg / 0.05 LBS
21.4 g / 0.2 N
 low risk
Pulling power decreases drastically per each millimeter of spacing. Remember that even a very thin break (e.g., contamination, paint, rust) noticeably diminishes the holding power. Magnetic products hold most effectively in perfect adhesion; distance kills the force. See how quickly the pull force fall, when the product does not adhere directly to the metal substrate. When calculating the mounting, eliminate redundant distances.

Table 2: Vertical hold (wall)
MPL 50x30x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.51 kg / 3.34 LBS
1514.0 g / 14.9 N
1 mm Stal (~0.2) 1.45 kg / 3.21 LBS
1454.0 g / 14.3 N
2 mm Stal (~0.2) 1.38 kg / 3.03 LBS
1376.0 g / 13.5 N
3 mm Stal (~0.2) 1.28 kg / 2.83 LBS
1282.0 g / 12.6 N
5 mm Stal (~0.2) 1.08 kg / 2.37 LBS
1076.0 g / 10.6 N
10 mm Stal (~0.2) 0.60 kg / 1.32 LBS
598.0 g / 5.9 N
15 mm Stal (~0.2) 0.30 kg / 0.66 LBS
300.0 g / 2.9 N
20 mm Stal (~0.2) 0.15 kg / 0.33 LBS
148.0 g / 1.5 N
30 mm Stal (~0.2) 0.04 kg / 0.09 LBS
40.0 g / 0.4 N
50 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
The table below calculates the approximate weight limit needed to cause the shifting of the magnet vertically along a upright steel plate (considering standard friction). The holding force depends on the distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MPL 50x30x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.27 kg / 5.01 LBS
2271.0 g / 22.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.51 kg / 3.34 LBS
1514.0 g / 14.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.76 kg / 1.67 LBS
757.0 g / 7.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.79 kg / 8.34 LBS
3785.0 g / 37.1 N
When mounting a element on a vertical plane (e.g., a fridge), it you can count on just about 1/5 of its nominal power. Gravitational force and a low friction coefficient cause that holders slip easier than they detach. Want to create a wall mount? Consider that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the magnet will slide down under a much lighter cargo. Utilizing a rubberized layer can effectively increase the grip.

Table 4: Steel thickness (saturation) - power losses
MPL 50x30x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.76 kg / 1.67 LBS
757.0 g / 7.4 N
1 mm
25%
 1.89 kg / 4.17 LBS
1892.5 g / 18.6 N
2 mm
50%
 3.79 kg / 8.34 LBS
3785.0 g / 37.1 N
3 mm
75%
 5.68 kg / 12.52 LBS
5677.5 g / 55.7 N
5 mm
100%
 7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
10 mm
100%
 7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
11 mm
100%
 7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
12 mm
100%
 7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
A thin sheet cannot conduct the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a weak sheet, the flux will penetrate right through and the holding will be smaller. To achieve full efficiency of this magnet's potential, you require a sufficiently solid piece of steel. The saturation effect means that on sheet metal structures (e.g., appliance housings), the product holds weaker. We advise picking the steel thickness based on the following data.

Table 5: Working in heat (material behavior) - resistance threshold
MPL 50x30x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
 OK
40 °C -2.2% 7.40 kg / 16.32 LBS
7403.5 g / 72.6 N
 OK
60 °C -4.4% 7.24 kg / 15.95 LBS
7236.9 g / 71.0 N
80 °C -6.6% 7.07 kg / 15.59 LBS
7070.4 g / 69.4 N
100 °C -28.8% 5.39 kg / 11.88 LBS
5389.8 g / 52.9 N
Classic neodymiums lose power above the temperature limit. Avoid high temperatures – high temperature can irreversibly damage this magnet. With increasing heat, the magnet's power temporarily lowers. Do not use this product in hot environments higher than its working range. Too high temperature will lead to permanent loss of magnetism.
*Engineering note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Thin magnets (low Pc) may lose charge permanently under lower heat stress than long magnets. Red status in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MPL 50x30x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.32 kg / 29.37 LBS
2 260 Gs
2.00 kg / 4.41 LBS
1999 g / 19.6 N
 N/A
1 mm 13.09 kg / 28.85 LBS
2 379 Gs
1.96 kg / 4.33 LBS
1963 g / 19.3 N
 11.78 kg / 25.96 LBS
~0 Gs
2 mm 12.80 kg / 28.21 LBS
2 353 Gs
1.92 kg / 4.23 LBS
1920 g / 18.8 N
 11.52 kg / 25.39 LBS
~0 Gs
3 mm 12.47 kg / 27.49 LBS
2 322 Gs
1.87 kg / 4.12 LBS
1870 g / 18.3 N
 11.22 kg / 24.74 LBS
~0 Gs
5 mm 11.71 kg / 25.82 LBS
2 251 Gs
1.76 kg / 3.87 LBS
1756 g / 17.2 N
 10.54 kg / 23.23 LBS
~0 Gs
10 mm 9.47 kg / 20.88 LBS
2 024 Gs
1.42 kg / 3.13 LBS
1421 g / 13.9 N
 8.52 kg / 18.79 LBS
~0 Gs
20 mm 5.26 kg / 11.60 LBS
1 509 Gs
0.79 kg / 1.74 LBS
789 g / 7.7 N
 4.74 kg / 10.44 LBS
~0 Gs
50 mm 0.66 kg / 1.45 LBS
534 Gs
0.10 kg / 0.22 LBS
99 g / 1.0 N
 0.59 kg / 1.31 LBS
~0 Gs
60 mm 0.34 kg / 0.76 LBS
386 Gs
0.05 kg / 0.11 LBS
52 g / 0.5 N
 0.31 kg / 0.68 LBS
~0 Gs
70 mm 0.19 kg / 0.41 LBS
285 Gs
0.03 kg / 0.06 LBS
28 g / 0.3 N
 0.17 kg / 0.37 LBS
~0 Gs
80 mm 0.11 kg / 0.23 LBS
214 Gs
0.02 kg / 0.03 LBS
16 g / 0.2 N
 0.10 kg / 0.21 LBS
~0 Gs
90 mm 0.06 kg / 0.14 LBS
164 Gs
0.01 kg / 0.02 LBS
9 g / 0.1 N
 0.06 kg / 0.12 LBS
~0 Gs
100 mm 0.04 kg / 0.08 LBS
128 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
 0.03 kg / 0.07 LBS
~0 Gs
Two magnets interact from a significantly greater distance than a magnet and sheet combination. The setup of two magnets generates a stronger field and a larger range of action. Want to build a strong closure? Apply two magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the collision energy is massive. The levitation is a bit weaker than the attraction, but still impressive.
*Field value between like poles drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Important: Calculations demonstrate friction force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 50x30x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Car key 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Powerful magnet radiation is a real danger to electronic devices and medical implants. These NdFeB products generate a field that destroys function of digital equipment. Notice: the unseen radiation acts through matter and plastic. Increased vigilance must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MPL 50x30x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 15.99 km/h
(4.44 m/s)
 0.44 J
30 mm 23.02 km/h
(6.39 m/s)
 0.92 J
50 mm 29.30 km/h
(8.14 m/s)
 1.49 J
100 mm 41.37 km/h
(11.49 m/s)
 2.97 J
NdFeB products are delicate – a violent impact against metal can result in shattering. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Striking energy can trigger coating fragments or dangerous crushing to fingers. Be sure to control the product during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Surface protection spec
MPL 50x30x4 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MPL 50x30x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 399 Mx 224.0 µWb
Pc Coefficient 0.14 Low (Flat)
Flux value emitted by the pole surface. Essential parameter in coil applications as well as sensors. Pc value determines the magnet's operating point.

Table 11: Submerged application
MPL 50x30x4 / N38

Environment Effective steel pull Effect
Air (land) 7.57 kg Standard
Water (riverbed) 8.67 kg
(+1.10 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.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Warning: On a vertical surface, the magnet holds merely a fraction of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Power loss vs temp

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.14

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 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%
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: 020497-2026
Quick Unit Converter
Force (pull)
Field Strength
Input a number in one of the inputs, to see the rest change on the fly.

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Model MPL 50x30x4 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 7.57 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.
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. To separate the MPL 50x30x4 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, 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. 7.57 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 50x30x4 / N38, it is best to use two-component adhesives (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. Remember to roughen and wash 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. 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: 50 mm (length), 30 mm (width), and 4 mm (thickness). It is a magnetic block with dimensions 50x30x4 mm and a self-weight of 45 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros as well as cons of Nd2Fe14B magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their power is durable, and after around ten years it decreases only by ~1% (according to research),
  • They do not lose their magnetic properties even under close interference source,
  • By covering with a lustrous coating of silver, the element presents an nice look,
  • Magnetic induction on the working layer of the magnet is very high,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to flexibility in shaping and the ability to modify to individual projects,
  • Key role in electronics industry – they serve a role in computer drives, electric motors, medical equipment, also industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Limitations

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated shapes.
  • Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these magnets are able to complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Maximum magnetic pulling force – what affects it?

The load parameter shown refers to the peak performance, measured under ideal test conditions, meaning:
  • using a base made of mild steel, functioning as a magnetic yoke
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a surface perfectly flat
  • with total lack of distance (no coatings)
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

It is worth knowing that the application force may be lower depending on elements below, starting with the most relevant:
  • Air gap (betwixt the magnet and the metal), as even a tiny clearance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Steel type – low-carbon steel attracts best. Higher carbon content decrease magnetic permeability and lifting capacity.
  • Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with neodymium magnets
Nickel coating and allergies

A percentage of the population suffer from a contact allergy to Ni, which is the standard coating for NdFeB magnets. Frequent touching may cause a rash. It is best to wear protective gloves.

Flammability

Dust produced during machining of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Choking Hazard

Strictly store magnets out of reach of children. Ingestion danger is high, and the effects of magnets connecting inside the body are very dangerous.

Danger to pacemakers

Life threat: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

Bodily injuries

Big blocks can crush fingers in a fraction of a second. Do not place your hand between two attracting surfaces.

GPS Danger

Be aware: rare earth magnets generate a field that confuses sensitive sensors. Keep a safe distance from your mobile, device, and GPS.

Maximum temperature

Do not overheat. NdFeB magnets are susceptible to heat. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Protective goggles

Watch out for shards. Magnets can explode upon violent connection, ejecting shards into the air. Wear goggles.

Handling rules

Exercise caution. Neodymium magnets act from a long distance and snap with huge force, often faster than you can move away.

Cards and drives

Intense magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Safety First! Details about risks in the article: Safety of working with magnets.