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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

see specifications »

4.71 ZŁ with VAT / pcs + price for transport

3.83 ZŁ net + 23% VAT / pcs

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Product card - 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 analysis of the product - report

These data represent the direct effect of a engineering calculation. Values rely on models for the class Nd2Fe14B. Actual conditions may differ. Please consider these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - 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
 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
 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
Grip strength weakens significantly with every mm of distance. Note that every additional insulation layer (e.g., contamination, varnish, rust) noticeably weakens the grip. Magnets operate strongest in perfect adhesion; air break drastically cuts the power. Analyze how flashily the pull force drop, when the product does not touch flatly to the steel surface. When planning the arrangement, discard redundant distances.

Table 2: Sliding hold (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 presents the estimated holding capacity needed to cause the shifting of the magnet downwards against a upright steel plate (considering typical friction). This value depends on the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - 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 mounting a magnet on a upright wall (e.g., a car body), it will maintain barely approx. 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that products slide down faster than they pop off the substrate. Designing a hanger? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a painted metal, the element will give way down under a much lighter cargo. Utilizing a rubberized layer can effectively improve the result.

Table 4: Steel thickness (substrate influence) - 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
A too thin steel cannot focus the entire magnetic field, which squanders power of the holder. Should you install a neodymium to a thin surface, the field will penetrate right through and the attraction force will be weaker. To squeeze 100% of this neodymium's power, you require a sufficiently solid element of steel. The saturation phenomenon causes that on delicate walls (e.g., appliance housings), the product works worse. We advise picking the steel cross-section according to the table below.

Table 5: Thermal stability (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 power past the thermal threshold. Watch out for overheating – high temperature can irreversibly damage this magnet. As the temperature rises, the neodymium's force temporarily decreases. Avoid using this magnet in hot environments higher than its operating temperature limit. Too high temperature will lead to permanent loss of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) are more susceptible to demagnetization sooner than long magnets. Warning indicator in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MPL 17x17x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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 interact from a significantly greater distance than a magnet and steel combination. Such a system of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Planning to create a solid fastener? Use a pair of magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the collision energy is extreme. The levitation is a bit weaker than the connection force, but still significant.
*Flux density for N-N configuration is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Important: Estimates apply to friction force of two matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (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
Timepiece 20 Gs (2.0 mT) 4.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Car key 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 is a large risk to IT equipment and pacemakers. These neodymiums generate a flux that disrupts operation of sensitive medical devices. Be aware: the unseen radiation passes through tissues 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 displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Collisions (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
NdFeB products are very brittle – a strong collision with metal can result in shattering. Watch the impact speed – a neodymium left loose becomes dangerous. Kinetic force can trigger coating fragments or injury to skin. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when working with powerful specimens.

Table 9: Coating parameters (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: Construction data (Flux)
MPL 17x17x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 509 Mx 65.1 µWb
Pc Coefficient 0.23 Low (Flat)
Total magnetic flux passing through the magnet pole. Essential parameter in coil applications and motors. Pc value determines the working geometry.

Table 11: Submerged application
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.
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

*Warning: On a vertical wall, the magnet holds just ~20% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) drastically reduces the holding force.

3. Heat tolerance

*For standard magnets, the max working temp 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
Elemental analysis
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: 020124-2026
Magnet Unit Converter
Magnet pull force
Field Strength
Input your value in a single field to generate results in all other units at once.

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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 the highest quality connection. As a magnetic bar with high power (approx. 3.22 kg), this product is available off-the-shelf from our warehouse in Poland. Additionally, 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. Watch your fingers! Magnets with a force of 3.22 kg can pinch very hard and cause hematomas. 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 generators and material handling systems. Thanks to the flat surface and high force (approx. 3.22 kg), they are ideal as hidden locks 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.
For mounting flat magnets MPL 17x17x3 / N38, it is best to use 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. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. 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 holding force amounting to approximately 3.22 kg (force ~31.54 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Pros and cons of Nd2Fe14B magnets.

Benefits

Besides their remarkable field intensity, neodymium magnets offer the following advantages:
  • They retain magnetic properties for around ten years – the drop is just ~1% (based on simulations),
  • Magnets very well defend themselves against demagnetization caused by foreign field sources,
  • Thanks to the elegant finish, the layer of nickel, gold, or silver-plated gives an aesthetic appearance,
  • Neodymium magnets ensure maximum magnetic induction on a small area, which increases force concentration,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • In view of the ability of free molding and customization to specialized needs, NdFeB magnets can be created in a variety of shapes and sizes, which amplifies use scope,
  • Huge importance in modern technologies – they find application in hard drives, electric motors, medical devices, also multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Cons of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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 suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Limited ability of creating nuts in the magnet and complex shapes - preferred is a housing - magnet mounting.
  • Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum holding power of the magnet – what affects it?

The declared magnet strength refers to the limit force, measured under laboratory conditions, namely:
  • on a base made of structural steel, perfectly concentrating the magnetic field
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with an ideally smooth contact surface
  • with direct contact (without paint)
  • under axial force vector (90-degree angle)
  • at ambient temperature room level

Magnet lifting force in use – key factors

Please note that the magnet holding may be lower subject to elements below, in order of importance:
  • Distance – existence of foreign body (paint, dirt, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is available only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin steel does not close the flux, causing part of the power to be wasted to the other side.
  • Chemical composition of the base – mild steel gives the best results. Higher carbon content lower magnetic permeability and lifting capacity.
  • Surface finish – full contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Warnings
Swallowing risk

Absolutely keep magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are tragic.

Avoid contact if allergic

Medical facts indicate that the nickel plating (standard magnet coating) is a strong allergen. If you have an allergy, refrain from touching magnets with bare hands and choose versions in plastic housing.

Data carriers

Avoid bringing magnets close to a wallet, laptop, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Power loss in heat

Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. The loss of strength is permanent.

ICD Warning

Life threat: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Respect the power

Handle with care. Neodymium magnets act from a distance and connect with massive power, often faster than you can move away.

Crushing force

Big blocks can smash fingers instantly. Under no circumstances put your hand between two attracting surfaces.

Dust explosion hazard

Mechanical processing of NdFeB material poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Magnet fragility

Neodymium magnets are ceramic materials, meaning they are fragile like glass. Impact of two magnets will cause them shattering into small pieces.

Threat to navigation

GPS units and smartphones are extremely sensitive to magnetic fields. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Safety First! More info about hazards in the article: Safety of working with magnets.