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MPL 17x17x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020124

GTIN/EAN: 5906301811305

5.00

length

17 mm [±0,1 mm]

Width

17 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

6.5 g

Magnetization Direction

↑ axial

Load capacity

3.22 kg / 31.54 N

Magnetic Induction

187.48 mT / 1875 Gs

Coating

[NiCuNi] Nickel

4.71 with VAT / pcs + price for transport

3.83 ZŁ net + 23% VAT / pcs

bulk discounts:

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Physical properties - MPL 17x17x3 / N38 - lamellar magnet

Specification / characteristics - MPL 17x17x3 / N38 - lamellar magnet

properties
properties values
Cat. no. 020124
GTIN/EAN 5906301811305
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 17 mm [±0,1 mm]
Width 17 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 6.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 3.22 kg / 31.54 N
Magnetic Induction ~ ? 187.48 mT / 1875 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 17x17x3 / 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 - technical parameters

Presented data represent the result of a engineering simulation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world parameters may deviate from the simulation results. Use these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs gap) - power drop
MPL 17x17x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1874 Gs
187.4 mT
3.22 kg / 7.10 lbs
3220.0 g / 31.6 N
warning
1 mm 1761 Gs
176.1 mT
2.84 kg / 6.27 lbs
2842.9 g / 27.9 N
warning
2 mm 1610 Gs
161.0 mT
2.38 kg / 5.24 lbs
2376.8 g / 23.3 N
warning
3 mm 1440 Gs
144.0 mT
1.90 kg / 4.19 lbs
1901.0 g / 18.6 N
safe
5 mm 1099 Gs
109.9 mT
1.11 kg / 2.44 lbs
1107.5 g / 10.9 N
safe
10 mm 508 Gs
50.8 mT
0.24 kg / 0.52 lbs
236.4 g / 2.3 N
safe
15 mm 245 Gs
24.5 mT
0.06 kg / 0.12 lbs
55.2 g / 0.5 N
safe
20 mm 131 Gs
13.1 mT
0.02 kg / 0.03 lbs
15.7 g / 0.2 N
safe
30 mm 48 Gs
4.8 mT
0.00 kg / 0.00 lbs
2.1 g / 0.0 N
safe
50 mm 12 Gs
1.2 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
safe

Table 2: Vertical force (wall)
MPL 17x17x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.64 kg / 1.42 lbs
644.0 g / 6.3 N
1 mm Stal (~0.2) 0.57 kg / 1.25 lbs
568.0 g / 5.6 N
2 mm Stal (~0.2) 0.48 kg / 1.05 lbs
476.0 g / 4.7 N
3 mm Stal (~0.2) 0.38 kg / 0.84 lbs
380.0 g / 3.7 N
5 mm Stal (~0.2) 0.22 kg / 0.49 lbs
222.0 g / 2.2 N
10 mm Stal (~0.2) 0.05 kg / 0.11 lbs
48.0 g / 0.5 N
15 mm Stal (~0.2) 0.01 kg / 0.03 lbs
12.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 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: Wall mounting (sliding) - behavior on slippery surfaces
MPL 17x17x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.97 kg / 2.13 lbs
966.0 g / 9.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.64 kg / 1.42 lbs
644.0 g / 6.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.32 kg / 0.71 lbs
322.0 g / 3.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.61 kg / 3.55 lbs
1610.0 g / 15.8 N

Table 4: Material efficiency (saturation) - power losses
MPL 17x17x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.32 kg / 0.71 lbs
322.0 g / 3.2 N
1 mm
25%
0.81 kg / 1.77 lbs
805.0 g / 7.9 N
2 mm
50%
1.61 kg / 3.55 lbs
1610.0 g / 15.8 N
3 mm
75%
2.42 kg / 5.32 lbs
2415.0 g / 23.7 N
5 mm
100%
3.22 kg / 7.10 lbs
3220.0 g / 31.6 N
10 mm
100%
3.22 kg / 7.10 lbs
3220.0 g / 31.6 N
11 mm
100%
3.22 kg / 7.10 lbs
3220.0 g / 31.6 N
12 mm
100%
3.22 kg / 7.10 lbs
3220.0 g / 31.6 N

Table 5: Thermal resistance (material behavior) - power drop
MPL 17x17x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 3.22 kg / 7.10 lbs
3220.0 g / 31.6 N
OK
40 °C -2.2% 3.15 kg / 6.94 lbs
3149.2 g / 30.9 N
OK
60 °C -4.4% 3.08 kg / 6.79 lbs
3078.3 g / 30.2 N
80 °C -6.6% 3.01 kg / 6.63 lbs
3007.5 g / 29.5 N
100 °C -28.8% 2.29 kg / 5.05 lbs
2292.6 g / 22.5 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 17x17x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 6.26 kg / 13.80 lbs
3 313 Gs
0.94 kg / 2.07 lbs
939 g / 9.2 N
N/A
1 mm 5.93 kg / 13.07 lbs
3 648 Gs
0.89 kg / 1.96 lbs
889 g / 8.7 N
5.33 kg / 11.76 lbs
~0 Gs
2 mm 5.53 kg / 12.19 lbs
3 523 Gs
0.83 kg / 1.83 lbs
829 g / 8.1 N
4.97 kg / 10.97 lbs
~0 Gs
3 mm 5.08 kg / 11.21 lbs
3 379 Gs
0.76 kg / 1.68 lbs
763 g / 7.5 N
4.58 kg / 10.09 lbs
~0 Gs
5 mm 4.15 kg / 9.16 lbs
3 053 Gs
0.62 kg / 1.37 lbs
623 g / 6.1 N
3.74 kg / 8.24 lbs
~0 Gs
10 mm 2.15 kg / 4.75 lbs
2 199 Gs
0.32 kg / 0.71 lbs
323 g / 3.2 N
1.94 kg / 4.27 lbs
~0 Gs
20 mm 0.46 kg / 1.01 lbs
1 016 Gs
0.07 kg / 0.15 lbs
69 g / 0.7 N
0.41 kg / 0.91 lbs
~0 Gs
50 mm 0.01 kg / 0.02 lbs
153 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
0.01 kg / 0.02 lbs
~0 Gs
60 mm 0.00 kg / 0.01 lbs
96 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
64 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
44 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
32 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
24 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Hazards (implants) - precautionary measures
MPL 17x17x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Timepiece 20 Gs (2.0 mT) 4.5 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Remote 50 Gs (5.0 mT) 3.0 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 17x17x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.45 km/h
(6.52 m/s)
0.14 J
30 mm 38.89 km/h
(10.80 m/s)
0.38 J
50 mm 50.19 km/h
(13.94 m/s)
0.63 J
100 mm 70.98 km/h
(19.72 m/s)
1.26 J

Table 9: Surface protection spec
MPL 17x17x3 / 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 17x17x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 509 Mx 65.1 µWb
Pc Coefficient 0.23 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 17x17x3 / N38

Environment Effective steel pull Effect
Air (land) 3.22 kg Standard
Water (riverbed) 3.69 kg
(+0.47 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically limits 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) = 0.23

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
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: 020124-2026
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Pulling force

Magnetic Induction

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This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 17x17x3 mm and a weight of 6.5 g, guarantees premium class connection. This rectangular block with a force of 31.54 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating protects 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 17x17x3 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 17x17x3 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
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. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 17x17x3 / N38 model is magnetized through the thickness (dimension 3 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 (17x17 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 17x17x3 mm, which, at a weight of 6.5 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 3.22 kg (force ~31.54 N), which, with such a compact shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of neodymium magnets.

Benefits

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • Their strength is maintained, and after around ten years it decreases only by ~1% (according to research),
  • Magnets effectively defend themselves against loss of magnetization caused by foreign field sources,
  • The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Magnetic induction on the working part of the magnet turns out to be exceptional,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Possibility of precise modeling and modifying to concrete requirements,
  • Versatile presence in modern industrial fields – they are commonly used in HDD drives, brushless drives, medical equipment, also technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • We recommend cover - magnetic holder, due to difficulties in creating nuts inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Magnet power is the result of a measurement for the most favorable conditions, assuming:
  • on a block made of structural steel, effectively closing the magnetic field
  • with a cross-section minimum 10 mm
  • with a surface perfectly flat
  • with total lack of distance (without paint)
  • under axial force direction (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

In real-world applications, the real power depends on several key aspects, ranked from most significant:
  • Clearance – existence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Plate thickness – insufficiently thick plate does not close the flux, causing part of the flux to be escaped into the air.
  • Material composition – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
  • Surface finish – full contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, whereas under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Nickel allergy

Certain individuals suffer from a hypersensitivity to Ni, which is the typical protective layer for neodymium magnets. Prolonged contact can result in a rash. We recommend wear safety gloves.

Immense force

Before use, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Product not for children

These products are not intended for children. Accidental ingestion of a few magnets can lead to them attracting across intestines, which poses a critical condition and necessitates immediate surgery.

Pacemakers

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Protect data

Device Safety: Strong magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

Finger safety

Pinching hazard: The attraction force is so great that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Fire risk

Powder produced during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Precision electronics

An intense magnetic field negatively affects the operation of compasses in phones and GPS navigation. Do not bring magnets near a smartphone to avoid damaging the sensors.

Heat sensitivity

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

Eye protection

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Safety First! More info about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98