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MPL 17x17x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020124

GTIN/EAN: 5906301811305

5.00
Load capacity 3.22 kg / 31.54 N Magnetic Induction 187.48 mT / 1875 Gs
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
Coating
[NiCuNi] Nickel
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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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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

Engineering analysis of the magnet - report

The following values are the result of a mathematical analysis. Values were calculated on models for the material Nd2Fe14B. Real-world performance may deviate from the simulation results. Please consider these calculations as a reference point for designers.

Table 1: Static pull force (pull vs distance) - interaction chart
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
 strong
1 mm 1761 Gs
176.1 mT
 2.84 kg / 6.27 lbs
2842.9 g / 27.9 N
 strong
2 mm 1610 Gs
161.0 mT
 2.38 kg / 5.24 lbs
2376.8 g / 23.3 N
 strong
3 mm 1440 Gs
144.0 mT
 1.90 kg / 4.19 lbs
1901.0 g / 18.6 N
 weak grip
5 mm 1099 Gs
109.9 mT
 1.11 kg / 2.44 lbs
1107.5 g / 10.9 N
 weak grip
10 mm 508 Gs
50.8 mT
 0.24 kg / 0.52 lbs
236.4 g / 2.3 N
 weak grip
15 mm 245 Gs
24.5 mT
 0.06 kg / 0.12 lbs
55.2 g / 0.5 N
 weak grip
20 mm 131 Gs
13.1 mT
 0.02 kg / 0.03 lbs
15.7 g / 0.2 N
 weak grip
30 mm 48 Gs
4.8 mT
 0.00 kg / 0.00 lbs
2.1 g / 0.0 N
 weak grip
50 mm 12 Gs
1.2 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
Magnetic force drops sharply per each millimeter of distance. Keep in mind that even the smallest gap (e.g., dirt, varnish, rust) noticeably reduces the pull force. Magnetic products work strongest during direct contact; air break kills the power. Analyze how quickly the pull force fall, when the product does not touch tightly to the steel surface. When planning the mounting, eliminate additional spacers.

Table 2: Shear load (vertical surface)
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
This section defines the estimated weight limit required to initiate the downward movement of the magnet down along a upright steel plate (considering typical friction). This parameter is relative to the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
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
When hanging a holder on a vertical wall (e.g., a board), it you can count on barely about 20%-30% of nominal attraction strength. Gravity as well as a weak degree of grip mean that magnets slide down faster than they detach. Planning a hanger? Remember that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the element will slide down under a much lighter load. Utilizing a rubberized coating can drastically increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
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
A too thin steel is unable to absorb the full magnetic flux, which squanders power of the holder. If you attach a powerful product to a weak sheet, the field will penetrate right through and the pull force will drop sharply. To utilize the maximum of this neodymium's potential, you need a suitably thick piece of steel. The saturation phenomenon means that on sheet metal structures (e.g., appliance housings), the product shows lower pull force. We recommend selecting the steel cross-section according to the table below.

Table 5: Working in heat (stability) - thermal limit
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
Ordinary NdFeB products lose strength above the temperature limit. Watch out for overheating – excessive heat can permanently demagnetize this product. With increasing heat, the magnet's capacity temporarily decreases. Do not use this magnet close to ovens exceeding its working range. Ignoring the limit will result in irreversible degradation of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Thin magnets (pancake types) risk losing magnetic properties under lower heat stress compared to rod magnets. Warning indicator in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 17x17x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (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
Two magnets attract each other from a much further distance than a neodymium and metal combination. Such a system of magnet-to-magnet generates a stronger field and a larger range of performance. Planning to create a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Remember that when bringing together two magnets, the impact force is huge. The levitation is marginally weaker than the connection force, but still impressive.
*The magnetic induction in repulsion mode is approximately ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
* Figures refer to friction force of a pair of identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - warnings
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
Mechanical watch 20 Gs (2.0 mT) 4.5 cm
Phone / Smartphone 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
Extremely neodym field poses a real danger to electronics as well as pacemakers. These neodymiums produce a flux that disrupts operation of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and plastic. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
MPL 17x17x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.10 km/h
(6.42 m/s)
 0.13 J
30 mm 23.79 km/h
(6.61 m/s)
 0.14 J
50 mm 23.78 km/h
(6.61 m/s)
 0.14 J
100 mm 23.80 km/h
(6.61 m/s)
 0.14 J
Neodymium magnets are delicate – a violent impact against metal risks their cracking. Watch the impact speed – a neodymium left loose becomes dangerous. Impact energy can cause material chips or painful pinches to skin. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Anti-corrosion coating durability
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)
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 (Flux)
MPL 17x17x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 509 Mx 65.1 µWb
Pc Coefficient 0.23 Low (Flat)
Flux value emitted by the magnet pole. Key data in coil applications as well as sensors. Pc value determines the magnet's operating point.

Table 11: Physics of underwater searching
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Sliding resistance

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

2. Steel saturation

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Thermal stability

*For standard magnets, 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

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

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: 020124-2026
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Component MPL 17x17x3 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 31.54 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.
The key to success is shifting the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 17x17x3 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, 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.
They constitute a key element in the production of generators and material handling systems. Thanks to the flat surface and high force (approx. 3.22 kg), they are ideal as closers in furniture making and mounting elements in automation. Customers often choose this model for workshop organization 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 17x17x3 / N38 model is magnetized axially (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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
The presented product is a neodymium magnet with precisely defined parameters: 17 mm (length), 17 mm (width), and 3 mm (thickness). It is a magnetic block with dimensions 17x17x3 mm and a self-weight of 6.5 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of Nd2Fe14B magnets.

Benefits

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
  • They do not lose their magnetic properties even under external field action,
  • In other words, due to the metallic layer of nickel, the element becomes visually attractive,
  • Neodymium magnets deliver maximum magnetic induction on a their surface, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to freedom in shaping and the capacity to adapt to complex applications,
  • Wide application in modern technologies – they are commonly used in magnetic memories, electric motors, precision medical tools, as well as industrial machines.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

Problematic aspects of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only protects them against impacts but also increases their 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.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • We recommend a housing - magnetic holder, due to difficulties in producing nuts inside the magnet and complex forms.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. Furthermore, small elements of these products can complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

The load parameter shown represents the limit force, recorded under ideal test conditions, specifically:
  • using a base made of mild steel, acting as a ideal flux conductor
  • possessing a massiveness of min. 10 mm to avoid saturation
  • with a plane cleaned and smooth
  • without the slightest air gap between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • at standard ambient temperature

What influences lifting capacity in practice

It is worth knowing that the working load will differ subject to the following factors, starting with the most relevant:
  • Air gap (between the magnet and the plate), because even a tiny distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Direction of force – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin plate does not accept the full field, causing part of the power to be wasted to the other side.
  • Chemical composition of the base – mild steel gives the best results. Alloy steels decrease magnetic permeability and holding force.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Uneven metal weaken the grip.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under perpendicular forces, however under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Safety rules for work with neodymium magnets
Warning for heart patients

For implant holders: Powerful magnets affect medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Hand protection

Watch your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing everything in their path. Be careful!

Handling guide

Before starting, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

Do not overheat magnets

Avoid heat. NdFeB magnets are sensitive to temperature. If you require operation above 80°C, ask us about HT versions (H, SH, UH).

Machining danger

Machining of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Threat to navigation

Be aware: rare earth magnets produce a field that confuses precision electronics. Maintain a separation from your phone, device, and GPS.

Product not for children

NdFeB magnets are not suitable for play. Eating several magnets can lead to them pinching intestinal walls, which constitutes a severe health hazard and necessitates urgent medical intervention.

Magnet fragility

NdFeB magnets are ceramic materials, meaning they are fragile like glass. Impact of two magnets leads to them cracking into small pieces.

Warning for allergy sufferers

A percentage of the population suffer from a contact allergy to Ni, which is the common plating for NdFeB magnets. Frequent touching can result in dermatitis. We suggest use protective gloves.

Cards and drives

Equipment safety: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Safety First! Need more info? Check our post: Why are neodymium magnets dangerous?