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MPL 50x50x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020167

GTIN/EAN: 5906301811732

5.00
Load capacity 33.73 kg / 330.92 N Magnetic Induction 209.75 mT / 2097 Gs
length
50 mm [±0,1 mm]
Width
50 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
187.5 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
check technical specifications »

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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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Parameters and shape of neodymium magnets can be tested with our online calculation tool.

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Technical of the product - MPL 50x50x10 / N38 - lamellar magnet

Specification / characteristics - MPL 50x50x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020167
GTIN/EAN 5906301811732
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 50 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 187.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 33.73 kg / 330.92 N
Magnetic Induction ~ ? 209.75 mT / 2097 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x50x10 / 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 product - data

Presented values are the result of a mathematical simulation. Results are based on models for the class Nd2Fe14B. Operational conditions may differ from theoretical values. Treat these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs gap) - power drop
MPL 50x50x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2097 Gs
209.7 mT
 33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
 critical level
1 mm 2056 Gs
205.6 mT
 32.43 kg / 71.50 pounds
32430.0 g / 318.1 N
 critical level
2 mm 2009 Gs
200.9 mT
 30.96 kg / 68.27 pounds
30964.6 g / 303.8 N
 critical level
3 mm 1957 Gs
195.7 mT
 29.38 kg / 64.77 pounds
29380.4 g / 288.2 N
 critical level
5 mm 1841 Gs
184.1 mT
 25.99 kg / 57.30 pounds
25992.3 g / 255.0 N
 critical level
10 mm 1514 Gs
151.4 mT
 17.58 kg / 38.75 pounds
17577.6 g / 172.4 N
 critical level
15 mm 1194 Gs
119.4 mT
 10.93 kg / 24.10 pounds
10931.8 g / 107.2 N
 critical level
20 mm 922 Gs
92.2 mT
 6.51 kg / 14.36 pounds
6512.2 g / 63.9 N
 medium risk
30 mm 543 Gs
54.3 mT
 2.26 kg / 4.98 pounds
2260.0 g / 22.2 N
 medium risk
50 mm 209 Gs
20.9 mT
 0.33 kg / 0.74 pounds
334.1 g / 3.3 N
 weak grip
Grip strength drops sharply with every mm of distance. Remember that even the smallest gap (e.g., dirt, varnish, veneer) significantly weakens the grip. Magnets hold strongest at the point of direct contact; distance kills the power. Notice how flashily the parameters drop, when the product does not adhere directly to the metal substrate. When calculating the arrangement, avoid unnecessary gaps.

Table 2: Sliding load (vertical surface)
MPL 50x50x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 6.75 kg / 14.87 pounds
6746.0 g / 66.2 N
1 mm Stal (~0.2) 6.49 kg / 14.30 pounds
6486.0 g / 63.6 N
2 mm Stal (~0.2) 6.19 kg / 13.65 pounds
6192.0 g / 60.7 N
3 mm Stal (~0.2) 5.88 kg / 12.95 pounds
5876.0 g / 57.6 N
5 mm Stal (~0.2) 5.20 kg / 11.46 pounds
5198.0 g / 51.0 N
10 mm Stal (~0.2) 3.52 kg / 7.75 pounds
3516.0 g / 34.5 N
15 mm Stal (~0.2) 2.19 kg / 4.82 pounds
2186.0 g / 21.4 N
20 mm Stal (~0.2) 1.30 kg / 2.87 pounds
1302.0 g / 12.8 N
30 mm Stal (~0.2) 0.45 kg / 1.00 pounds
452.0 g / 4.4 N
50 mm Stal (~0.2) 0.07 kg / 0.15 pounds
66.0 g / 0.6 N
This section calculates the approximate holding capacity required to initiate the sliding of the magnet downwards along a vertical steel wall (considering standard friction coefficient). This parameter is relative to the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 50x50x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
10.12 kg / 22.31 pounds
10119.0 g / 99.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
6.75 kg / 14.87 pounds
6746.0 g / 66.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.37 kg / 7.44 pounds
3373.0 g / 33.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
16.87 kg / 37.18 pounds
16865.0 g / 165.4 N
When hanging a element on a vertical wall (e.g., a fridge), it will maintain barely about 1/5 of nominal attraction strength. Gravity and a low friction coefficient cause that products slide down faster than they pop off the substrate. Designing a vertical fastening? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a painted metal, the magnet will slip down under a significantly smaller load. Using a rubber coating can significantly improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MPL 50x50x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.69 kg / 3.72 pounds
1686.5 g / 16.5 N
1 mm
13%
 4.22 kg / 9.30 pounds
4216.3 g / 41.4 N
2 mm
25%
 8.43 kg / 18.59 pounds
8432.5 g / 82.7 N
3 mm
38%
 12.65 kg / 27.89 pounds
12648.8 g / 124.1 N
5 mm
63%
 21.08 kg / 46.48 pounds
21081.2 g / 206.8 N
10 mm
100%
 33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
11 mm
100%
 33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
12 mm
100%
 33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
A thin metal plate is incapable of conduct the full magnetic flux, which wastes potential of the holder. Should you attach a powerful product to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To squeeze full efficiency of this neodymium's power, you require a sufficiently solid element of metal. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the holder holds weaker. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - power drop
MPL 50x50x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
 OK
40 °C -2.2% 32.99 kg / 72.73 pounds
32987.9 g / 323.6 N
 OK
60 °C -4.4% 32.25 kg / 71.09 pounds
32245.9 g / 316.3 N
80 °C -6.6% 31.50 kg / 69.45 pounds
31503.8 g / 309.1 N
100 °C -28.8% 24.02 kg / 52.95 pounds
24015.8 g / 235.6 N
Ordinary NdFeB products irreversibly lose parameters after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly destroy this product. As the temperature rises, the magnet's power briefly lowers. Avoid using this magnet close to ovens higher than its safe range. Ignoring the limit will cause destruction of magnetic properties.
*Engineering note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) risk losing magnetic properties sooner compared to rod magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
MPL 50x50x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 67.80 kg / 149.46 pounds
3 611 Gs
10.17 kg / 22.42 pounds
10169 g / 99.8 N
 N/A
1 mm 66.54 kg / 146.70 pounds
4 156 Gs
9.98 kg / 22.01 pounds
9982 g / 97.9 N
 59.89 kg / 132.03 pounds
~0 Gs
2 mm 65.18 kg / 143.70 pounds
4 113 Gs
9.78 kg / 21.56 pounds
9777 g / 95.9 N
 58.66 kg / 129.33 pounds
~0 Gs
3 mm 63.74 kg / 140.53 pounds
4 067 Gs
9.56 kg / 21.08 pounds
9562 g / 93.8 N
 57.37 kg / 126.48 pounds
~0 Gs
5 mm 60.67 kg / 133.75 pounds
3 968 Gs
9.10 kg / 20.06 pounds
9101 g / 89.3 N
 54.60 kg / 120.38 pounds
~0 Gs
10 mm 52.24 kg / 115.18 pounds
3 682 Gs
7.84 kg / 17.28 pounds
7836 g / 76.9 N
 47.02 kg / 103.66 pounds
~0 Gs
20 mm 35.33 kg / 77.89 pounds
3 028 Gs
5.30 kg / 11.68 pounds
5299 g / 52.0 N
 31.80 kg / 70.10 pounds
~0 Gs
50 mm 7.69 kg / 16.96 pounds
1 413 Gs
1.15 kg / 2.54 pounds
1154 g / 11.3 N
 6.92 kg / 15.26 pounds
~0 Gs
60 mm 4.54 kg / 10.01 pounds
1 086 Gs
0.68 kg / 1.50 pounds
681 g / 6.7 N
 4.09 kg / 9.01 pounds
~0 Gs
70 mm 2.72 kg / 6.01 pounds
841 Gs
0.41 kg / 0.90 pounds
409 g / 4.0 N
 2.45 kg / 5.41 pounds
~0 Gs
80 mm 1.67 kg / 3.68 pounds
658 Gs
0.25 kg / 0.55 pounds
250 g / 2.5 N
 1.50 kg / 3.31 pounds
~0 Gs
90 mm 1.05 kg / 2.31 pounds
521 Gs
0.16 kg / 0.35 pounds
157 g / 1.5 N
 0.94 kg / 2.08 pounds
~0 Gs
100 mm 0.67 kg / 1.48 pounds
417 Gs
0.10 kg / 0.22 pounds
101 g / 1.0 N
 0.60 kg / 1.33 pounds
~0 Gs
Two magnetic products attract each other from a wider radius than a neodymium and metal combination. Such a system of two magnets generates a stronger field and a further horizon of operation. Want to build a powerful holder? Use a pair of magnets instead of one magnet and a striker plate. Remember that when bringing together two magnets, the pinch force is huge. The repulsion force is a bit weaker than the attraction, but still significant.
*Field value for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Important: Results refer to friction force of dual matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - warnings
MPL 50x50x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 21.0 cm
Hearing aid 10 Gs (1.0 mT) 16.5 cm
Timepiece 20 Gs (2.0 mT) 13.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 10.0 cm
Remote 50 Gs (5.0 mT) 9.5 cm
Payment card 400 Gs (40.0 mT) 4.0 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm
Powerful magnet radiation is a large risk to IT equipment and medical implants. These neodymiums produce a field that destroys function of sensitive medical devices. Notice: the invisible magnetic field acts through matter and plastic. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
MPL 50x50x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.75 km/h
(5.21 m/s)
 2.54 J
30 mm 23.65 km/h
(6.57 m/s)
 4.05 J
50 mm 24.20 km/h
(6.72 m/s)
 4.24 J
100 mm 24.32 km/h
(6.76 m/s)
 4.28 J
Neodymium magnets are prone to chipping – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can trigger coating fragments or injury to fingers. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Surface protection spec
MPL 50x50x10 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Pc)
MPL 50x50x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 61 501 Mx 615.0 µWb
Pc Coefficient 0.26 Low (Flat)
Flux value passing through the magnet pole. Key data when building generators and motors. Pc value determines the magnet's operating point.

Table 11: Physics of underwater searching
MPL 50x50x10 / N38

Environment Effective steel pull Effect
Air (land) 33.73 kg Standard
Water (riverbed) 38.62 kg
(+4.89 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.

1. Vertical hold

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

2. Steel saturation

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

3. Power loss vs temp

*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) = 0.26

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%

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: 020167-2026
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Model MPL 50x50x10 / N38 features a flat shape and industrial pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 330.92 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating secures 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. Watch your fingers! Magnets with a force of 33.73 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
They constitute a key element in the production of 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 50x50x10 / N38, we recommend utilizing strong epoxy glues (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. 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 50x50x10 mm, which, at a weight of 187.5 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 33.73 kg (force ~330.92 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of neodymium magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose power, even after approximately 10 years – the reduction in power is only ~1% (according to tests),
  • They possess excellent resistance to magnetic field loss as a result of opposing magnetic fields,
  • Thanks to the glossy finish, the surface of Ni-Cu-Ni, gold, or silver-plated gives an elegant appearance,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise machining as well as modifying to precise needs,
  • Significant place in innovative solutions – they are commonly used in mass storage devices, motor assemblies, diagnostic systems, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in miniature devices

Disadvantages

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's 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.
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We recommend casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complex forms.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, small components of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum lifting capacity of the magnet – what it depends on?

Magnet power was determined for ideal contact conditions, taking into account:
  • using a base made of low-carbon steel, functioning as a magnetic yoke
  • with a cross-section of at least 10 mm
  • with an ideally smooth contact surface
  • without any clearance between the magnet and steel
  • under axial application of breakaway force (90-degree angle)
  • at room temperature

What influences lifting capacity in practice

During everyday use, the actual lifting capacity results from many variables, listed from the most important:
  • Distance – the presence of foreign body (paint, tape, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
  • Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
  • Temperature – heating the magnet results in weakening of force. It is worth remembering 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 attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a small distance between the magnet and the plate lowers the load capacity.

Safe handling of NdFeB magnets
Serious injuries

Big blocks can smash fingers in a fraction of a second. Never place your hand betwixt two strong magnets.

Caution required

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

This is not a toy

Neodymium magnets are not suitable for play. Accidental ingestion of several magnets may result in them pinching intestinal walls, which constitutes a critical condition and requires urgent medical intervention.

Cards and drives

Intense magnetic fields can erase data on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.

Operating temperature

Regular neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. Damage is permanent.

GPS Danger

Navigation devices and mobile phones are extremely sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.

Nickel coating and allergies

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, immediately stop working with magnets and wear gloves.

Magnets are brittle

Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Health Danger

Individuals with a pacemaker have to maintain an safe separation from magnets. The magnetism can disrupt the functioning of the life-saving device.

Machining danger

Machining of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

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