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MPL 20x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020128

GTIN/EAN: 5906301811343

5.00

length

20 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

7.5 g

Magnetization Direction

↑ axial

Load capacity

6.15 kg / 60.31 N

Magnetic Induction

349.47 mT / 3495 Gs

Coating

[NiCuNi] Nickel

4.54 with VAT / pcs + price for transport

3.69 ZŁ net + 23% VAT / pcs

bulk discounts:

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Weight along with shape of a neodymium magnet can be analyzed with our online calculation tool.

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Physical properties - MPL 20x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 20x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020128
GTIN/EAN 5906301811343
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 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 7.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.15 kg / 60.31 N
Magnetic Induction ~ ? 349.47 mT / 3495 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x10x5 / 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

Physical modeling of the assembly - report

The following values are the outcome of a physical simulation. Results rely on models for the class Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Please consider these calculations as a reference point during assembly planning.

Table 1: Static force (force vs distance) - characteristics
MPL 20x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3493 Gs
349.3 mT
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
strong
1 mm 3035 Gs
303.5 mT
4.64 kg / 10.23 lbs
4641.8 g / 45.5 N
strong
2 mm 2558 Gs
255.8 mT
3.30 kg / 7.27 lbs
3298.0 g / 32.4 N
strong
3 mm 2120 Gs
212.0 mT
2.26 kg / 4.99 lbs
2264.8 g / 22.2 N
strong
5 mm 1433 Gs
143.3 mT
1.03 kg / 2.28 lbs
1034.5 g / 10.1 N
safe
10 mm 574 Gs
57.4 mT
0.17 kg / 0.37 lbs
166.1 g / 1.6 N
safe
15 mm 267 Gs
26.7 mT
0.04 kg / 0.08 lbs
35.9 g / 0.4 N
safe
20 mm 141 Gs
14.1 mT
0.01 kg / 0.02 lbs
10.1 g / 0.1 N
safe
30 mm 52 Gs
5.2 mT
0.00 kg / 0.00 lbs
1.4 g / 0.0 N
safe
50 mm 13 Gs
1.3 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
safe

Table 2: Vertical force (wall)
MPL 20x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.23 kg / 2.71 lbs
1230.0 g / 12.1 N
1 mm Stal (~0.2) 0.93 kg / 2.05 lbs
928.0 g / 9.1 N
2 mm Stal (~0.2) 0.66 kg / 1.46 lbs
660.0 g / 6.5 N
3 mm Stal (~0.2) 0.45 kg / 1.00 lbs
452.0 g / 4.4 N
5 mm Stal (~0.2) 0.21 kg / 0.45 lbs
206.0 g / 2.0 N
10 mm Stal (~0.2) 0.03 kg / 0.07 lbs
34.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 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

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 20x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.85 kg / 4.07 lbs
1845.0 g / 18.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.23 kg / 2.71 lbs
1230.0 g / 12.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.62 kg / 1.36 lbs
615.0 g / 6.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.08 kg / 6.78 lbs
3075.0 g / 30.2 N

Table 4: Material efficiency (saturation) - power losses
MPL 20x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.62 kg / 1.36 lbs
615.0 g / 6.0 N
1 mm
25%
1.54 kg / 3.39 lbs
1537.5 g / 15.1 N
2 mm
50%
3.08 kg / 6.78 lbs
3075.0 g / 30.2 N
3 mm
75%
4.61 kg / 10.17 lbs
4612.5 g / 45.2 N
5 mm
100%
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
10 mm
100%
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
11 mm
100%
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
12 mm
100%
6.15 kg / 13.56 lbs
6150.0 g / 60.3 N

Table 5: Working in heat (stability) - power drop
MPL 20x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.15 kg / 13.56 lbs
6150.0 g / 60.3 N
OK
40 °C -2.2% 6.01 kg / 13.26 lbs
6014.7 g / 59.0 N
OK
60 °C -4.4% 5.88 kg / 12.96 lbs
5879.4 g / 57.7 N
80 °C -6.6% 5.74 kg / 12.66 lbs
5744.1 g / 56.3 N
100 °C -28.8% 4.38 kg / 9.65 lbs
4378.8 g / 43.0 N

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 20x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 15.04 kg / 33.17 lbs
4 923 Gs
2.26 kg / 4.98 lbs
2257 g / 22.1 N
N/A
1 mm 13.20 kg / 29.11 lbs
6 544 Gs
1.98 kg / 4.37 lbs
1980 g / 19.4 N
11.88 kg / 26.19 lbs
~0 Gs
2 mm 11.36 kg / 25.03 lbs
6 069 Gs
1.70 kg / 3.76 lbs
1703 g / 16.7 N
10.22 kg / 22.53 lbs
~0 Gs
3 mm 9.63 kg / 21.22 lbs
5 588 Gs
1.44 kg / 3.18 lbs
1444 g / 14.2 N
8.66 kg / 19.10 lbs
~0 Gs
5 mm 6.71 kg / 14.78 lbs
4 664 Gs
1.01 kg / 2.22 lbs
1006 g / 9.9 N
6.03 kg / 13.30 lbs
~0 Gs
10 mm 2.53 kg / 5.58 lbs
2 865 Gs
0.38 kg / 0.84 lbs
380 g / 3.7 N
2.28 kg / 5.02 lbs
~0 Gs
20 mm 0.41 kg / 0.90 lbs
1 148 Gs
0.06 kg / 0.13 lbs
61 g / 0.6 N
0.37 kg / 0.81 lbs
~0 Gs
50 mm 0.01 kg / 0.02 lbs
165 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.01 lbs
104 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
69 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
48 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
35 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
26 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 20x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.5 cm
Hearing aid 10 Gs (1.0 mT) 6.0 cm
Mechanical watch 20 Gs (2.0 mT) 4.5 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (cracking risk) - warning
MPL 20x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 29.36 km/h
(8.16 m/s)
0.25 J
30 mm 50.03 km/h
(13.90 m/s)
0.72 J
50 mm 64.58 km/h
(17.94 m/s)
1.21 J
100 mm 91.32 km/h
(25.37 m/s)
2.41 J

Table 9: Corrosion resistance
MPL 20x10x5 / 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)

Table 10: Construction data (Pc)
MPL 20x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 7 031 Mx 70.3 µWb
Pc Coefficient 0.42 Low (Flat)

Table 11: Physics of underwater searching
MPL 20x10x5 / N38

Environment Effective steel pull Effect
Air (land) 6.15 kg Standard
Water (riverbed) 7.04 kg
(+0.89 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Sliding resistance

*Caution: On a vertical wall, the magnet holds just a fraction of its nominal pull.

2. Steel thickness impact

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.42

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
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%
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: 020128-2026
Quick Unit Converter
Pulling force

Magnetic Field

Other products

Component MPL 20x10x5 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 60.31 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 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 6.15 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 20x10x5 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 6.15 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 20x10x5 / 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. 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 20x10x5 mm, which, at a weight of 7.5 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 6.15 kg (force ~60.31 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of Nd2Fe14B magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They retain full power for around ten years – the drop is just ~1% (according to analyses),
  • Magnets effectively resist against demagnetization caused by external fields,
  • By applying a smooth coating of silver, the element presents an modern look,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of exact creating and optimizing to precise applications,
  • Fundamental importance in high-tech industry – they are utilized in hard drives, electromotive mechanisms, precision medical tools, as well as complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Disadvantages

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • At strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • We suggest cover - magnetic holder, due to difficulties in producing nuts inside the magnet and complex shapes.
  • Potential hazard to health – tiny shards of magnets are risky, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small components of these magnets can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Highest magnetic holding forcewhat contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, taking into account:
  • with the use of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • whose thickness equals approx. 10 mm
  • characterized by smoothness
  • under conditions of no distance (surface-to-surface)
  • under axial force vector (90-degree angle)
  • at standard ambient temperature

Key elements affecting lifting force

Effective lifting capacity is affected by specific conditions, mainly (from priority):
  • Gap (between the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Plate thickness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be wasted into the air.
  • Material composition – different alloys attracts identically. Alloy additives weaken the interaction with the magnet.
  • Plate texture – smooth surfaces ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Warnings
Do not drill into magnets

Fire warning: Rare earth powder is explosive. Avoid machining magnets in home conditions as this may cause fire.

Life threat

Warning for patients: Strong magnetic fields disrupt electronics. Keep minimum 30 cm distance or ask another person to work with the magnets.

Heat sensitivity

Do not overheat. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Respect the power

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Choking Hazard

These products are not intended for children. Swallowing a few magnets may result in them pinching intestinal walls, which poses a direct threat to life and necessitates urgent medical intervention.

Sensitization to coating

Some people experience a contact allergy to nickel, which is the typical protective layer for NdFeB magnets. Extended handling might lead to a rash. We suggest wear safety gloves.

Beware of splinters

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Phone sensors

GPS units and smartphones are highly susceptible to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Electronic hazard

Do not bring magnets close to a wallet, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.

Crushing risk

Watch your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Safety First! Need more info? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98