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MPL 40x10x18 / N38 - lamellar magnet

lamellar magnet

Catalog no 020149

GTIN/EAN: 5906301811558

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

18 mm [±0,1 mm]

Weight

54 g

Magnetization Direction

→ diametrical

Load capacity

16.72 kg / 164.01 N

Magnetic Induction

540.48 mT / 5405 Gs

Coating

[NiCuNi] Nickel

product specifications »

18.45 ZŁ with VAT / pcs + price for transport

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Technical specification - MPL 40x10x18 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x18 / N38 - lamellar magnet

properties
properties values
Cat. no. 020149
GTIN/EAN 5906301811558
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 40 mm [±0,1 mm]
Width 10 mm [±0,1 mm]
Height 18 mm [±0,1 mm]
Weight 54 g
Magnetization Direction → diametrical
Load capacity ~ ? 16.72 kg / 164.01 N
Magnetic Induction ~ ? 540.48 mT / 5405 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x18 / 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 product - technical parameters

The following data represent the result of a physical simulation. Results are based on models for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs gap) - characteristics
MPL 40x10x18 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5402 Gs
540.2 mT
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
 crushing
1 mm 4664 Gs
466.4 mT
 12.46 kg / 27.48 lbs
12464.6 g / 122.3 N
 crushing
2 mm 3970 Gs
397.0 mT
 9.03 kg / 19.90 lbs
9028.7 g / 88.6 N
 strong
3 mm 3362 Gs
336.2 mT
 6.48 kg / 14.28 lbs
6476.4 g / 63.5 N
 strong
5 mm 2432 Gs
243.2 mT
 3.39 kg / 7.47 lbs
3388.5 g / 33.2 N
 strong
10 mm 1220 Gs
122.0 mT
 0.85 kg / 1.88 lbs
853.2 g / 8.4 N
 weak grip
15 mm 703 Gs
70.3 mT
 0.28 kg / 0.62 lbs
282.9 g / 2.8 N
 weak grip
20 mm 440 Gs
44.0 mT
 0.11 kg / 0.24 lbs
111.1 g / 1.1 N
 weak grip
30 mm 203 Gs
20.3 mT
 0.02 kg / 0.05 lbs
23.6 g / 0.2 N
 weak grip
50 mm 64 Gs
6.4 mT
 0.00 kg / 0.01 lbs
2.4 g / 0.0 N
 weak grip
Pulling power drops drastically per each millimeter of gap. Note that every additional insulation layer (e.g., dirt, varnish, dust) significantly weakens the grip. Magnets operate strongest during direct contact; gap kills the force. See how rapidly the parameters plummet, when the magnet does not touch tightly to the steel surface. When calculating the arrangement, eliminate additional spacers.

Table 2: Slippage capacity (wall)
MPL 40x10x18 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.34 kg / 7.37 lbs
3344.0 g / 32.8 N
1 mm Stal (~0.2) 2.49 kg / 5.49 lbs
2492.0 g / 24.4 N
2 mm Stal (~0.2) 1.81 kg / 3.98 lbs
1806.0 g / 17.7 N
3 mm Stal (~0.2) 1.30 kg / 2.86 lbs
1296.0 g / 12.7 N
5 mm Stal (~0.2) 0.68 kg / 1.49 lbs
678.0 g / 6.7 N
10 mm Stal (~0.2) 0.17 kg / 0.37 lbs
170.0 g / 1.7 N
15 mm Stal (~0.2) 0.06 kg / 0.12 lbs
56.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 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 approximate force necessary to cause the sliding of the magnet vertically on a upright metal surface (assuming standard friction coefficient). This value varies with the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MPL 40x10x18 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.02 kg / 11.06 lbs
5016.0 g / 49.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.34 kg / 7.37 lbs
3344.0 g / 32.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.67 kg / 3.69 lbs
1672.0 g / 16.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
8.36 kg / 18.43 lbs
8360.0 g / 82.0 N
When mounting a magnet on a vertical plane (e.g., a car body), it will only hold barely about 1/5 of its nominal power. Gravity and a low friction coefficient influence the fact that products move down easier than they detach. Want to create a wall mount? Remember that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the element will slip down under a noticeably lighter load. Utilizing a rubberized pad can effectively increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 40x10x18 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.84 kg / 1.84 lbs
836.0 g / 8.2 N
1 mm
13%
 2.09 kg / 4.61 lbs
2090.0 g / 20.5 N
2 mm
25%
 4.18 kg / 9.22 lbs
4180.0 g / 41.0 N
3 mm
38%
 6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
5 mm
63%
 10.45 kg / 23.04 lbs
10450.0 g / 102.5 N
10 mm
100%
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
11 mm
100%
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
12 mm
100%
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
A thin metal plate is not enough to focus the entire magnetic field, which squanders power of the holder. If you mount a strong magnet to a too thin substrate, the flux will penetrate right through and the holding will be smaller. To squeeze 100% of this neodymium's potential, you require a sufficiently solid element of metal. The saturation effect causes that on delicate walls (e.g., thin profiles), the magnet shows lower pull force. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal resistance (stability) - thermal limit
MPL 40x10x18 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
 OK
40 °C -2.2% 16.35 kg / 36.05 lbs
16352.2 g / 160.4 N
 OK
60 °C -4.4% 15.98 kg / 35.24 lbs
15984.3 g / 156.8 N
 OK
80 °C -6.6% 15.62 kg / 34.43 lbs
15616.5 g / 153.2 N
100 °C -28.8% 11.90 kg / 26.25 lbs
11904.6 g / 116.8 N
Classic neodymiums lose parameters above the temperature limit. Avoid high temperatures – high temperature can permanently demagnetize this product. With every degree above norm, the magnet's power temporarily lowers. Do not use this product close to ovens higher than its working range. Ignoring the limit will lead to permanent loss of magnetic properties.
*Engineering note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low Pc) may lose charge permanently under lower heat stress than long magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MPL 40x10x18 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 71.96 kg / 158.65 lbs
5 928 Gs
10.79 kg / 23.80 lbs
10794 g / 105.9 N
 N/A
1 mm 62.49 kg / 137.76 lbs
10 068 Gs
9.37 kg / 20.66 lbs
9373 g / 91.9 N
 56.24 kg / 123.98 lbs
~0 Gs
2 mm 53.65 kg / 118.27 lbs
9 328 Gs
8.05 kg / 17.74 lbs
8047 g / 78.9 N
 48.28 kg / 106.44 lbs
~0 Gs
3 mm 45.76 kg / 100.88 lbs
8 615 Gs
6.86 kg / 15.13 lbs
6864 g / 67.3 N
 41.18 kg / 90.79 lbs
~0 Gs
5 mm 32.92 kg / 72.58 lbs
7 308 Gs
4.94 kg / 10.89 lbs
4938 g / 48.4 N
 29.63 kg / 65.32 lbs
~0 Gs
10 mm 14.58 kg / 32.15 lbs
4 864 Gs
2.19 kg / 4.82 lbs
2188 g / 21.5 N
 13.13 kg / 28.94 lbs
~0 Gs
20 mm 3.67 kg / 8.10 lbs
2 441 Gs
0.55 kg / 1.21 lbs
551 g / 5.4 N
 3.30 kg / 7.29 lbs
~0 Gs
50 mm 0.21 kg / 0.46 lbs
585 Gs
0.03 kg / 0.07 lbs
32 g / 0.3 N
 0.19 kg / 0.42 lbs
~0 Gs
60 mm 0.10 kg / 0.22 lbs
406 Gs
0.02 kg / 0.03 lbs
15 g / 0.1 N
 0.09 kg / 0.20 lbs
~0 Gs
70 mm 0.05 kg / 0.12 lbs
293 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
 0.05 kg / 0.10 lbs
~0 Gs
80 mm 0.03 kg / 0.06 lbs
217 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
90 mm 0.02 kg / 0.04 lbs
165 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.03 lbs
~0 Gs
100 mm 0.01 kg / 0.02 lbs
128 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
Two magnetic products attract each other from a much further distance than a neodymium and metal combination. The connection of two magnets produces a massive flux and a larger range of operation. Want to build a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is massive. The levitation is a bit weaker than the attraction, but still large.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Note: Estimates demonstrate sliding force of dual matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (electronics) - precautionary measures
MPL 40x10x18 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.5 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Remote 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
A strong magnetic field poses a large risk to IT equipment and medical implants. These magnets generate a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field passes through tissues and housings. Exceptional care must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
MPL 40x10x18 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.30 km/h
(5.08 m/s)
 0.70 J
30 mm 30.76 km/h
(8.55 m/s)
 1.97 J
50 mm 39.69 km/h
(11.02 m/s)
 3.28 J
100 mm 56.12 km/h
(15.59 m/s)
 6.56 J
NdFeB products are prone to chipping – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Kinetic force can destroy the magnet or injury to skin. Be sure to control the product during bringing near metal so it doesn't hit with great force against the steel surface. A collision at high speed means shattering of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Surface protection spec
MPL 40x10x18 / 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 following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MPL 40x10x18 / N38

Parameter Value SI Unit / Description
Magnetic Flux 21 285 Mx 212.9 µWb
Pc Coefficient 0.79 High (Stable)
Total magnetic flux emitted by the pole surface. Essential parameter in coil applications as well as sensors. Pc value determines the magnet's operating point.

Table 11: Physics of underwater searching
MPL 40x10x18 / N38

Environment Effective steel pull Effect
Air (land) 16.72 kg Standard
Water (riverbed) 19.14 kg
(+2.42 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

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

2. Plate thickness effect

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

3. Heat tolerance

*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) = 0.79

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.

Technical specification and ecology
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: 020149-2026
Magnet Unit Converter
Force (pull)
Field Strength
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Component MPL 40x10x18 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. As a block magnet with high power (approx. 16.72 kg), this product is available off-the-shelf from our warehouse in Poland. 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. Watch your fingers! Magnets with a force of 16.72 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. 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. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 40x10x18 / N38 model is magnetized axially (dimension 18 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 (40x10 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 10 mm (width), and 18 mm (thickness). It is a magnetic block with dimensions 40x10x18 mm and a self-weight of 54 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros as well as cons of rare earth magnets.

Pros

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after approximately 10 years it drops only by ~1% (according to research),
  • They retain their magnetic properties even under external field action,
  • By using a smooth layer of silver, the element presents an aesthetic look,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of precise forming as well as optimizing to atypical applications,
  • Huge importance in future technologies – they serve a role in computer drives, electromotive mechanisms, medical equipment, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in compact constructions

Cons

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • Due to limitations in realizing threads and complicated forms in magnets, we recommend using cover - magnetic holder.
  • Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price is relatively high,

Pull force analysis

Best holding force of the magnet in ideal parameters – what affects it?

The declared magnet strength refers to the limit force, recorded under optimal environment, namely:
  • using a plate made of mild steel, functioning as a magnetic yoke
  • with a thickness no less than 10 mm
  • with a plane perfectly flat
  • without any insulating layer between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • in neutral thermal conditions

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the application force will differ depending on the following factors, in order of importance:
  • Clearance – existence of any layer (paint, dirt, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Plate thickness – insufficiently thick plate does not accept the full field, causing part of the power to be escaped to the other side.
  • Steel grade – ideal substrate is pure iron steel. Hardened steels may attract less.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity was determined by applying a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

H&S for magnets
Choking Hazard

Adult use only. Small elements can be swallowed, causing serious injuries. Store away from children and animals.

Immense force

Use magnets with awareness. Their huge power can surprise even experienced users. Plan your moves and do not underestimate their power.

Phone sensors

GPS units and mobile phones are extremely susceptible to magnetism. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Thermal limits

Watch the temperature. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.

Nickel allergy

Some people experience a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Extended handling may cause skin redness. It is best to use protective gloves.

Physical harm

Watch your fingers. Two powerful magnets will join immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Protective goggles

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Collision of two magnets leads to them cracking into shards.

Cards and drives

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

Warning for heart patients

Warning for patients: Powerful magnets affect medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

Mechanical processing

Powder created during cutting of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Warning! Looking for details? Check our post: Are neodymium magnets dangerous?