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MPL 20x5x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020131

GTIN/EAN: 5906301811374

5.00
Load capacity 3.46 kg / 33.93 N Magnetic Induction 358.88 mT / 3589 Gs
length
20 mm [±0,1 mm]
Width
5 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
2.25 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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Technical details - MPL 20x5x3 / N38 - lamellar magnet

Specification / characteristics - MPL 20x5x3 / N38 - lamellar magnet

properties
properties values
Cat. no. 020131
GTIN/EAN 5906301811374
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 20 mm [±0,1 mm]
Width 5 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 2.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 3.46 kg / 33.93 N
Magnetic Induction ~ ? 358.88 mT / 3589 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x5x3 / 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 simulation of the assembly - data

The following information represent the result of a physical analysis. Results were calculated on algorithms for the class Nd2Fe14B. Operational conditions may deviate from the simulation results. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - power drop
MPL 20x5x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3585 Gs
358.5 mT
 3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
 strong
1 mm 2619 Gs
261.9 mT
 1.85 kg / 4.07 lbs
1846.6 g / 18.1 N
 safe
2 mm 1818 Gs
181.8 mT
 0.89 kg / 1.96 lbs
889.8 g / 8.7 N
 safe
3 mm 1279 Gs
127.9 mT
 0.44 kg / 0.97 lbs
440.2 g / 4.3 N
 safe
5 mm 696 Gs
69.6 mT
 0.13 kg / 0.29 lbs
130.6 g / 1.3 N
 safe
10 mm 225 Gs
22.5 mT
 0.01 kg / 0.03 lbs
13.6 g / 0.1 N
 safe
15 mm 97 Gs
9.7 mT
 0.00 kg / 0.01 lbs
2.5 g / 0.0 N
 safe
20 mm 49 Gs
4.9 mT
 0.00 kg / 0.00 lbs
0.6 g / 0.0 N
 safe
30 mm 17 Gs
1.7 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 safe
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 safe
Grip strength drops drastically with every mm of gap. Note that even a microscopic distance (e.g., dirt, paint, rust) noticeably reduces the pull force. Neodymiums work strongest during direct contact; distance weakens the power. Analyze how flashily the parameters drop, when the product does not adhere flatly to the metal substrate. When calculating the assembly, discard unnecessary gaps.

Table 2: Slippage force (wall)
MPL 20x5x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.69 kg / 1.53 lbs
692.0 g / 6.8 N
1 mm Stal (~0.2) 0.37 kg / 0.82 lbs
370.0 g / 3.6 N
2 mm Stal (~0.2) 0.18 kg / 0.39 lbs
178.0 g / 1.7 N
3 mm Stal (~0.2) 0.09 kg / 0.19 lbs
88.0 g / 0.9 N
5 mm Stal (~0.2) 0.03 kg / 0.06 lbs
26.0 g / 0.3 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 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
This section shows the theoretical weight limit required to cause the slippage of the magnet down along a upright steel wall (considering standard friction). This value is a function of the distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 20x5x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.04 kg / 2.29 lbs
1038.0 g / 10.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.69 kg / 1.53 lbs
692.0 g / 6.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.35 kg / 0.76 lbs
346.0 g / 3.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.73 kg / 3.81 lbs
1730.0 g / 17.0 N
When hanging a holder on a upright plane (e.g., a car body), it will maintain barely about 1/5 of its nominal power. Gravitational force and a weak degree of grip influence the fact that magnets slip faster than they pop off the substrate. Want to create a vertical fastening? Consider that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the element will slide down under a much lighter cargo. Using a rubber pad can effectively improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MPL 20x5x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.35 kg / 0.76 lbs
346.0 g / 3.4 N
1 mm
25%
 0.87 kg / 1.91 lbs
865.0 g / 8.5 N
2 mm
50%
 1.73 kg / 3.81 lbs
1730.0 g / 17.0 N
3 mm
75%
 2.59 kg / 5.72 lbs
2595.0 g / 25.5 N
5 mm
100%
 3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
10 mm
100%
 3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
11 mm
100%
 3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
12 mm
100%
 3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
A thin metal plate is unable to absorb the entire magnetic field, which wastes potential of the magnet. Should you mount a strong magnet to a thin surface, the magnetism will penetrate right through and the holding will be smaller. To achieve the maximum of this neodymium's potential, you need a suitably thick piece of steel. The saturation effect means that on delicate walls (e.g., appliance housings), the holder holds weaker. We suggest choosing the steel thickness based on the following data.

Table 5: Thermal resistance (material behavior) - power drop
MPL 20x5x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
 OK
40 °C -2.2% 3.38 kg / 7.46 lbs
3383.9 g / 33.2 N
 OK
60 °C -4.4% 3.31 kg / 7.29 lbs
3307.8 g / 32.4 N
80 °C -6.6% 3.23 kg / 7.12 lbs
3231.6 g / 31.7 N
100 °C -28.8% 2.46 kg / 5.43 lbs
2463.5 g / 24.2 N
Classic neodymiums change their properties parameters after exceeding the maximum temperature. Protect against heat – heat can permanently damage this product. As the temperature rises, the magnet's capacity temporarily drops. Refrain from using this magnet near heat sources exceeding its safe range. Too high temperature will result in irreversible degradation of magnetic properties.
*Engineering note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Flat magnets (low Pc) are more susceptible to demagnetization under lower heat stress than long magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MPL 20x5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 7.92 kg / 17.47 lbs
4 860 Gs
1.19 kg / 2.62 lbs
1189 g / 11.7 N
 N/A
1 mm 5.94 kg / 13.10 lbs
6 209 Gs
0.89 kg / 1.97 lbs
891 g / 8.7 N
 5.35 kg / 11.79 lbs
~0 Gs
2 mm 4.23 kg / 9.32 lbs
5 238 Gs
0.63 kg / 1.40 lbs
634 g / 6.2 N
 3.81 kg / 8.39 lbs
~0 Gs
3 mm 2.94 kg / 6.49 lbs
4 369 Gs
0.44 kg / 0.97 lbs
441 g / 4.3 N
 2.65 kg / 5.84 lbs
~0 Gs
5 mm 1.42 kg / 3.14 lbs
3 039 Gs
0.21 kg / 0.47 lbs
213 g / 2.1 N
 1.28 kg / 2.82 lbs
~0 Gs
10 mm 0.30 kg / 0.66 lbs
1 393 Gs
0.04 kg / 0.10 lbs
45 g / 0.4 N
 0.27 kg / 0.59 lbs
~0 Gs
20 mm 0.03 kg / 0.07 lbs
450 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
56 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
34 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
23 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
16 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
11 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
8 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 wider radius than a magnet and sheet setup. Such a system of two magnets produces a massive flux and a wider radius of action. Planning to create a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the pinch force is massive. The repulsion force is slightly lower than the attraction, but still large.
*The magnetic induction between like poles drops to ~0 Gs at the midpoint between the magnets (due to field cancellation).
Attention: Results show friction force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - warnings
MPL 20x5x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Timepiece 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Car key 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field poses a real danger to IT equipment as well as medical implants. These magnets generate a field that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and glass. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MPL 20x5x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.51 km/h
(6.81 m/s)
 0.05 J
30 mm 24.60 km/h
(6.83 m/s)
 0.05 J
50 mm 24.60 km/h
(6.83 m/s)
 0.05 J
100 mm 24.61 km/h
(6.84 m/s)
 0.05 J
Neodymium magnets are prone to chipping – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Impact energy can destroy the magnet or dangerous crushing to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when playing with large magnets.

Table 9: Anti-corrosion coating durability
MPL 20x5x3 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MPL 20x5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 197 Mx 32.0 µWb
Pc Coefficient 0.36 Low (Flat)
Flux value passing through the pole surface. Key data in coil applications as well as sensors. Pc value defines the working geometry.

Table 11: Physics of underwater searching
MPL 20x5x3 / N38

Environment Effective steel pull Effect
Air (land) 3.46 kg Standard
Water (riverbed) 3.96 kg
(+0.50 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.

1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds just a fraction of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) severely weakens the holding force.

3. Heat tolerance

*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) = 0.36

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 specification and ecology

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%

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: 020131-2026
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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 20x5x3 mm and a weight of 2.25 g, guarantees the highest quality connection. This magnetic block with a force of 33.93 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, 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. To separate the MPL 20x5x3 / 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.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 3.46 kg), they are ideal as closers in furniture making and mounting elements in automation. Customers often choose this model for hanging tools 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 20x5x3 / N38 model is magnetized axially (dimension 3 mm), which means that the N and S poles are located on its largest, flat surfaces. 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.
This model is characterized by dimensions 20x5x3 mm, which, at a weight of 2.25 g, makes it an element with high energy density. It is a magnetic block with dimensions 20x5x3 mm and a self-weight of 2.25 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of neodymium magnets.

Strengths

Besides their remarkable pulling force, neodymium magnets offer the following advantages:
  • They do not lose power, even during around 10 years – the decrease in power is only ~1% (according to tests),
  • Magnets very well protect themselves against loss of magnetization caused by external fields,
  • The use of an refined layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnets are characterized by huge magnetic induction on the active area,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Due to the ability of free shaping and adaptation to individualized solutions, neodymium magnets can be manufactured in a broad palette of shapes and sizes, which amplifies use scope,
  • Versatile presence in future technologies – they find application in data components, drive modules, medical devices, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in small systems

Weaknesses

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • NdFeB 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 as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Due to limitations in creating threads and complex forms in magnets, we propose using casing - magnetic mount.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
  • Due to neodymium price, their price is relatively high,

Pull force analysis

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

Breakaway force was defined for ideal contact conditions, assuming:
  • using a base made of low-carbon steel, functioning as a ideal flux conductor
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • with direct contact (no paint)
  • during detachment in a direction vertical to the mounting surface
  • at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity impacted by specific conditions, such as (from priority):
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Material type – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
  • Temperature – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Danger to the youngest

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

Serious injuries

Risk of injury: The pulling power is so great that it can result in blood blisters, pinching, and broken bones. Use thick gloves.

Fragile material

NdFeB magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets leads to them cracking into shards.

Electronic hazard

Avoid bringing magnets near a purse, computer, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Precision electronics

Be aware: rare earth magnets produce a field that interferes with precision electronics. Keep a safe distance from your phone, device, and GPS.

Respect the power

Handle magnets consciously. Their huge power can shock even experienced users. Stay alert and do not underestimate their power.

Life threat

Warning for patients: Strong magnetic fields affect electronics. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Power loss in heat

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.

Avoid contact if allergic

A percentage of the population have a contact allergy to nickel, which is the standard coating for neodymium magnets. Prolonged contact may cause an allergic reaction. We suggest use safety gloves.

Flammability

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

Important! Need more info? Check our post: Are neodymium magnets dangerous?