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MPL 30x5x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020448

GTIN/EAN: 5906301811923

length

30 mm [±0,1 mm]

Width

5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

5.63 g

Magnetization Direction

↑ axial

Load capacity

7.03 kg / 68.94 N

Magnetic Induction

446.27 mT / 4463 Gs

Coating

[NiCuNi] Nickel

product parameters »

4.15 ZŁ with VAT / pcs + price for transport

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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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Detailed specification - MPL 30x5x5 / N38 - lamellar magnet

Specification / characteristics - MPL 30x5x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020448
GTIN/EAN 5906301811923
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 30 mm [±0,1 mm]
Width 5 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 5.63 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.03 kg / 68.94 N
Magnetic Induction ~ ? 446.27 mT / 4463 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x5x5 / 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 - report

Presented values constitute the result of a physical analysis. Values rely on models for the class Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs distance) - interaction chart
MPL 30x5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4458 Gs
445.8 mT
 7.03 kg / 15.50 lbs
7030.0 g / 69.0 N
 warning
1 mm 3235 Gs
323.5 mT
 3.70 kg / 8.16 lbs
3702.2 g / 36.3 N
 warning
2 mm 2271 Gs
227.1 mT
 1.82 kg / 4.02 lbs
1825.0 g / 17.9 N
 weak grip
3 mm 1628 Gs
162.8 mT
 0.94 kg / 2.07 lbs
937.0 g / 9.2 N
 weak grip
5 mm 927 Gs
92.7 mT
 0.30 kg / 0.67 lbs
304.2 g / 3.0 N
 weak grip
10 mm 342 Gs
34.2 mT
 0.04 kg / 0.09 lbs
41.4 g / 0.4 N
 weak grip
15 mm 166 Gs
16.6 mT
 0.01 kg / 0.02 lbs
9.7 g / 0.1 N
 weak grip
20 mm 92 Gs
9.2 mT
 0.00 kg / 0.01 lbs
3.0 g / 0.0 N
 weak grip
30 mm 36 Gs
3.6 mT
 0.00 kg / 0.00 lbs
0.5 g / 0.0 N
 weak grip
50 mm 9 Gs
0.9 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Magnetic force weakens drastically with every subsequent millimeter of gap. Remember that even a very thin break (e.g., dirt, varnish, rust) significantly weakens the grip. Magnets operate optimally at the point of direct contact; distance kills the power. See how quickly the load capacity plummet, when the product does not adhere tightly to the metal substrate. When planning the arrangement, discard redundant distances.

Table 2: Vertical hold (wall)
MPL 30x5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.41 kg / 3.10 lbs
1406.0 g / 13.8 N
1 mm Stal (~0.2) 0.74 kg / 1.63 lbs
740.0 g / 7.3 N
2 mm Stal (~0.2) 0.36 kg / 0.80 lbs
364.0 g / 3.6 N
3 mm Stal (~0.2) 0.19 kg / 0.41 lbs
188.0 g / 1.8 N
5 mm Stal (~0.2) 0.06 kg / 0.13 lbs
60.0 g / 0.6 N
10 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below indicates the approximate weight limit required to cause the downward movement of the magnet downwards against a vertical metal surface (considering standard friction coefficient). This value varies with the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 30x5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.11 kg / 4.65 lbs
2109.0 g / 20.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.41 kg / 3.10 lbs
1406.0 g / 13.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.70 kg / 1.55 lbs
703.0 g / 6.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.52 kg / 7.75 lbs
3515.0 g / 34.5 N
When placing a element on a vertical surface (e.g., a fridge), it will maintain just approx. 20%-30% of its nominal power. Gravity and a low friction coefficient influence the fact that holders slip faster than they detach. Want to create a hanger? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the holder will slide down under a noticeably lighter load. Application of an anti-slip coating can drastically raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 30x5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.70 kg / 1.55 lbs
703.0 g / 6.9 N
1 mm
25%
 1.76 kg / 3.87 lbs
1757.5 g / 17.2 N
2 mm
50%
 3.52 kg / 7.75 lbs
3515.0 g / 34.5 N
3 mm
75%
 5.27 kg / 11.62 lbs
5272.5 g / 51.7 N
5 mm
100%
 7.03 kg / 15.50 lbs
7030.0 g / 69.0 N
10 mm
100%
 7.03 kg / 15.50 lbs
7030.0 g / 69.0 N
11 mm
100%
 7.03 kg / 15.50 lbs
7030.0 g / 69.0 N
12 mm
100%
 7.03 kg / 15.50 lbs
7030.0 g / 69.0 N
A thin sheet cannot conduct the full magnetic flux, which squanders power of the holder. Should you install a neodymium to a too thin substrate, the field will pass right through and the holding will be smaller. To achieve the maximum of this magnet's power, you require a sufficiently solid piece of steel. The saturation effect means that on thin elements (e.g., appliance housings), the holder shows lower pull force. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal stability (stability) - resistance threshold
MPL 30x5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.03 kg / 15.50 lbs
7030.0 g / 69.0 N
 OK
40 °C -2.2% 6.88 kg / 15.16 lbs
6875.3 g / 67.4 N
 OK
60 °C -4.4% 6.72 kg / 14.82 lbs
6720.7 g / 65.9 N
80 °C -6.6% 6.57 kg / 14.48 lbs
6566.0 g / 64.4 N
100 °C -28.8% 5.01 kg / 11.03 lbs
5005.4 g / 49.1 N
Classic neodymiums irreversibly lose power after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly demagnetize this product. As the temperature rises, the neodymium's force briefly decreases. Avoid using this product near heat sources higher than its working range. Exceeding the critical threshold will cause permanent loss of magnetic properties.
*Engineering note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) may lose charge permanently under lower heat stress than taller cylinders. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 30x5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 18.38 kg / 40.52 lbs
5 383 Gs
2.76 kg / 6.08 lbs
2757 g / 27.0 N
 N/A
1 mm 13.60 kg / 29.99 lbs
7 670 Gs
2.04 kg / 4.50 lbs
2040 g / 20.0 N
 12.24 kg / 26.99 lbs
~0 Gs
2 mm 9.68 kg / 21.34 lbs
6 470 Gs
1.45 kg / 3.20 lbs
1452 g / 14.2 N
 8.71 kg / 19.20 lbs
~0 Gs
3 mm 6.79 kg / 14.97 lbs
5 419 Gs
1.02 kg / 2.25 lbs
1018 g / 10.0 N
 6.11 kg / 13.47 lbs
~0 Gs
5 mm 3.39 kg / 7.48 lbs
3 830 Gs
0.51 kg / 1.12 lbs
509 g / 5.0 N
 3.05 kg / 6.73 lbs
~0 Gs
10 mm 0.80 kg / 1.75 lbs
1 855 Gs
0.12 kg / 0.26 lbs
119 g / 1.2 N
 0.72 kg / 1.58 lbs
~0 Gs
20 mm 0.11 kg / 0.24 lbs
684 Gs
0.02 kg / 0.04 lbs
16 g / 0.2 N
 0.10 kg / 0.21 lbs
~0 Gs
50 mm 0.00 kg / 0.01 lbs
111 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
72 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
49 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
34 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
25 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
19 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets attract each other from a significantly greater distance than a magnet and sheet combination. The connection of magnet-to-magnet produces a massive flux and a wider radius of performance. Want to build a powerful holder? Apply two magnets instead of a neodymium and a steel. Remember that when bringing together two magnets, the pinch force is huge. The repulsion force is a bit weaker than the attraction, but still large.
*Flux density for N-N configuration drops to ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
* Results refer to sliding force of a pair of same magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - warnings
MPL 30x5x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.0 cm
Timepiece 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.0 cm
Remote 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation poses a large risk to electronics as well as pacemakers. These neodymiums produce a field that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field acts through matter and housings. Special caution must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
MPL 30x5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 35.77 km/h
(9.94 m/s)
 0.28 J
30 mm 61.73 km/h
(17.15 m/s)
 0.83 J
50 mm 79.69 km/h
(22.14 m/s)
 1.38 J
100 mm 112.70 km/h
(31.30 m/s)
 2.76 J
Neodymium magnets are prone to chipping – a collision with steel risks their cracking. Watch the impact speed – a magnet released freely becomes dangerous. Striking energy can trigger coating fragments or injury to skin. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when working with large magnets.

Table 9: Corrosion resistance
MPL 30x5x5 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MPL 30x5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 700 Mx 57.0 µWb
Pc Coefficient 0.46 Low (Flat)
Total magnetic flux passing through the magnet pole. Essential parameter in coil applications as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
MPL 30x5x5 / N38

Environment Effective steel pull Effect
Air (land) 7.03 kg Standard
Water (riverbed) 8.05 kg
(+1.02 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Note: On a vertical wall, the magnet holds merely approx. 20-30% of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) significantly 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) = 0.46

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.

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%
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: 020448-2026
Measurement Calculator
Force (pull)
Magnetic Field
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This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 30x5x5 mm and a weight of 5.63 g, guarantees premium class connection. This magnetic block with a force of 68.94 N is ready for shipment in 24h, allowing for rapid realization of your project. 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. To separate the MPL 30x5x5 / 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. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 30x5x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. 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 30x5x5 / N38, we recommend utilizing two-component adhesives (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).
Standardly, the MPL 30x5x5 / N38 model is magnetized axially (dimension 5 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 (30x5 mm), which is ideal for flat mounting. 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: 30 mm (length), 5 mm (width), and 5 mm (thickness). It is a magnetic block with dimensions 30x5x5 mm and a self-weight of 5.63 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of neodymium magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • By using a smooth layer of silver, the element presents an professional look,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • Thanks to freedom in forming and the ability to adapt to individual projects,
  • Significant place in high-tech industry – they are utilized in data components, motor assemblies, diagnostic systems, as well as technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons

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
  • NdFeB magnets demagnetize 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 resistant to moisture, when using outdoors
  • We recommend casing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small elements of these products are able to be problematic in diagnostics medical when they are in the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what it depends on?

Breakaway force was determined for ideal contact conditions, assuming:
  • on a base made of mild steel, perfectly concentrating the magnetic flux
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • with an ground touching surface
  • with direct contact (without coatings)
  • for force acting at a right angle (in the magnet axis)
  • at ambient temperature room level

Lifting capacity in real conditions – factors

In real-world applications, the real power is determined by several key aspects, listed from most significant:
  • Clearance – the presence of foreign body (rust, dirt, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick sheet does not accept the full field, causing part of the flux to be escaped into the air.
  • Metal type – not every steel attracts identically. High carbon content worsen the attraction effect.
  • Surface structure – the more even the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the holding force is lower. In addition, even a slight gap between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets
Implant safety

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

Compass and GPS

A powerful magnetic field disrupts the functioning of magnetometers in smartphones and navigation systems. Keep magnets close to a device to avoid breaking the sensors.

Handling rules

Use magnets with awareness. Their immense force can surprise even experienced users. Be vigilant and respect their force.

Bodily injuries

Big blocks can crush fingers in a fraction of a second. Under no circumstances put your hand between two attracting surfaces.

Allergy Warning

A percentage of the population suffer from a sensitization to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact can result in a rash. We strongly advise use safety gloves.

Keep away from children

Adult use only. Tiny parts can be swallowed, causing intestinal necrosis. Keep away from kids and pets.

Machining danger

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Permanent damage

Watch the temperature. Heating the magnet to high heat will permanently weaken its properties and pulling force.

Magnetic media

Device Safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).

Risk of cracking

Watch out for shards. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Caution! Want to know more? Check our post: Are neodymium magnets dangerous?