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MPL 20x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020129

GTIN: 5906301811350

5.00

length

20 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

60 g

Magnetization Direction

↑ axial

Load capacity

18.94 kg / 185.77 N

Magnetic Induction

540.22 mT

Coating

[NiCuNi] Nickel

33.21 ZŁ with VAT / pcs + price for transport

27.00 ZŁ net + 23% VAT / pcs

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MPL 20x20x20 / N38 - lamellar magnet

Specification / characteristics MPL 20x20x20 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020129
GTIN	5906301811350
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	20 mm [±0,1 mm]
Height	20 mm [±0,1 mm]
Weight	60 g
Magnetization Direction	↑ axial
Load capacity ~ ?	18.94 kg / 185.77 N
Magnetic Induction ~ ?	540.22 mT
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x20x20 / N38 - lamellar magnet

properties	values	units
remenance Br [Min. - Max.] ?	12.2-12.6	kGs
remenance Br [Min. - Max.] ?	1220-1260	T
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

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 106	°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 modeling of the product - data

The following data represent the result of a engineering analysis. Values are based on algorithms for the class NdFeB. Operational parameters might slightly differ from theoretical values. Treat these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - interaction chart
MPL 20x20x20 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	7290 Gs 729.0 mT	18.94 kg / 18940.0 g 185.8 N	critical level
1 mm	6629 Gs 662.9 mT	15.66 kg / 15659.0 g 153.6 N	critical level
2 mm	5970 Gs 597.0 mT	12.70 kg / 12702.5 g 124.6 N	critical level
5 mm	3114 Gs 311.4 mT	3.46 kg / 3455.3 g 33.9 N	medium risk
10 mm	1671 Gs 167.1 mT	1.00 kg / 995.4 g 9.8 N	safe
15 mm	936 Gs 93.6 mT	0.31 kg / 312.4 g 3.1 N	safe
20 mm	562 Gs 56.2 mT	0.11 kg / 112.7 g 1.1 N	safe
30 mm	244 Gs 24.4 mT	0.02 kg / 21.1 g 0.2 N	safe
50 mm	73 Gs 7.3 mT	0.00 kg / 1.9 g 0.0 N	safe

Pulling power decreases significantly with every subsequent millimeter of gap. Keep in mind that every additional insulation layer (e.g., contamination, paint, veneer) significantly diminishes the holding power. Magnets operate most effectively at the point of direct contact; distance kills the force. Notice how rapidly the parameters plummet, when the product does not adhere tightly to the steel surface. When calculating the assembly, eliminate unnecessary gaps.

Table 2: Vertical assembly (shearing) - vertical pull
MPL 20x20x20 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	5.68 kg / 5682.0 g 55.7 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	3.79 kg / 3788.0 g 37.2 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.89 kg / 1894.0 g 18.6 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	9.47 kg / 9470.0 g 92.9 N

When placing a element on a upright plane (e.g., a board), it you can count on only approx. 1/5 of its maximum pull force. Gravity as well as a weak degree of grip influence the fact that magnets slide down easier than they pull off. Planning a vertical fastening? Note that the shear force is much weaker than the maximum static pull force. On a painted metal, the magnet will give way down under a much lighter cargo. Utilizing a rubberized layer can drastically raise the stability.

Table 3: Steel thickness (substrate influence) - sheet metal selection
MPL 20x20x20 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	0.95 kg / 947.0 g 9.3 N
1 mm	13%	2.37 kg / 2367.5 g 23.2 N
2 mm	25%	4.74 kg / 4735.0 g 46.5 N
5 mm	63%	11.84 kg / 11837.5 g 116.1 N
10 mm	100%	18.94 kg / 18940.0 g 185.8 N

A thin metal plate is not enough to take in the entire magnetic field, which squanders power of the magnet. Should you mount a strong magnet to a thin surface, the flux will pass right through and the pull force will drop sharply. To squeeze the maximum of this neodymium's power, you need a suitably thick backing of steel. The saturation effect means that on sheet metal structures (e.g., appliance housings), the magnet works worse. We suggest choosing the steel thickness from these parameters.

Table 4: Thermal resistance (material behavior) - power drop
MPL 20x20x20 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	18.94 kg / 18940.0 g 185.8 N	OK
40 °C	-2.2%	18.52 kg / 18523.3 g 181.7 N	OK
60 °C	-4.4%	18.11 kg / 18106.6 g 177.6 N	OK
80 °C	-6.6%	17.69 kg / 17690.0 g 173.5 N
100 °C	-28.8%	13.49 kg / 13485.3 g 132.3 N

Ordinary NdFeB products irreversibly lose parameters above the temperature limit. Avoid high temperatures – high temperature can irreversibly demagnetize this magnet. With increasing heat, the magnet's power temporarily lowers. Do not use this product near heat sources exceeding its operating temperature limit. Ignoring the limit will result in destruction of magnetic properties.

Table 5: Two magnets (attraction) - forces in the system
MPL 20x20x20 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	28.41 kg / 28410.0 g 278.7 N	N/A
2 mm	19.05 kg / 19050.0 g 186.9 N	17.78 kg / 17780.0 g 174.4 N
5 mm	5.19 kg / 5190.0 g 50.9 N	4.84 kg / 4844.0 g 47.5 N
10 mm	1.50 kg / 1500.0 g 14.7 N	1.40 kg / 1400.0 g 13.7 N
20 mm	0.17 kg / 165.0 g 1.6 N	0.15 kg / 154.0 g 1.5 N
50 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N

Two magnetic products attract each other from a much further distance than a magnet and steel combination. The setup of two magnets produces a massive flux and a larger range of action. 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 extreme. The repulsion force is marginally weaker than the attraction, but still impressive.

Table 6: Safety (HSE) (electronics) - warnings
MPL 20x20x20 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	14.0 cm
Hearing aid	10 Gs (1.0 mT)	11.0 cm
Mechanical watch	20 Gs (2.0 mT)	8.5 cm
Mobile device	40 Gs (4.0 mT)	6.5 cm
Car key	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

Powerful magnet radiation is a real danger to electronics and medical implants. These neodymiums generate a flux that disrupts operation of digital equipment. Be aware: the unseen radiation penetrates the body and housings. Special caution must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 7: Dynamics (cracking risk) - collision effects
MPL 20x20x20 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	18.50 km/h (5.14 m/s)	0.79 J
30 mm	31.06 km/h (8.63 m/s)	2.23 J
50 mm	40.07 km/h (11.13 m/s)	3.72 J
100 mm	56.66 km/h (15.74 m/s)	7.43 J

Magnetic elements are delicate – a strong collision with metal causes immediate chipping. Watch the impact speed – a neodymium left loose turns into a projectile. Striking energy can cause material chips or injury to skin. Always hold the magnet during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Use safety goggles when playing with large magnets.

Table 8: Surface protection spec
MPL 20x20x20 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 9: Hydrostatics and buoyancy
MPL 20x20x20 / N38

Environment	Effective steel pull	Effect
Air (land)	18.94 kg	Standard
Water (riverbed)	21.69 kg (+2.75 kg Buoyancy gain)	+14.5%

Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

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MPL 10x10x10 / N38 - lamellar magnet

5.29 ZŁ brutto / pcs

Model MPL 20x20x20 / 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 185.77 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 20x20x20 / 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.

They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 18.94 kg), they are ideal as hidden locks 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 20x20x20 / N38, it is best to use strong epoxy glues (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).

Standardly, the MPL 20x20x20 / N38 model is magnetized axially (dimension 20 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 (20x20 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: 20 mm (length), 20 mm (width), and 20 mm (thickness). It is a magnetic block with dimensions 20x20x20 mm and a self-weight of 60 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of neodymium magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
They are extremely resistant to demagnetization induced by external disturbances,
A magnet with a shiny silver surface has an effective appearance,
The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
Possibility of individual forming as well as adjusting to atypical requirements,
Wide application in innovative solutions – they find application in mass storage devices, motor assemblies, advanced medical instruments, and other advanced devices.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets: tips and applications.

At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
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.
They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Limited ability of creating threads in the magnet and complex forms - preferred is casing - mounting mechanism.
Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. Furthermore, small components of these products are able to be problematic in diagnostics medical in case of swallowing.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum lifting capacity of the magnet – what it depends on?

The load parameter shown concerns the limit force, recorded under laboratory conditions, namely:

on a plate made of structural steel, perfectly concentrating the magnetic flux
possessing a massiveness of minimum 10 mm to avoid saturation
with a plane perfectly flat
with direct contact (without coatings)
for force applied at a right angle (in the magnet axis)
in neutral thermal conditions

Practical lifting capacity: influencing factors

During everyday use, the actual lifting capacity results from a number of factors, presented from the most important:

Clearance – existence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
Material composition – different alloys attracts identically. Alloy additives worsen the attraction effect.
Surface quality – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets

Handling guide

Handle magnets with awareness. Their immense force can shock even professionals. Stay alert and respect their power.

Warning for allergy sufferers

It is widely known that nickel (standard magnet coating) is a strong allergen. If you have an allergy, prevent direct skin contact or opt for coated magnets.

Hand protection

Pinching hazard: The pulling power is so great that it can result in blood blisters, pinching, and broken bones. Use thick gloves.

Do not drill into magnets

Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Eye protection

Watch out for shards. Magnets can explode upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Adults only

Product intended for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from children and animals.

Compass and GPS

Navigation devices and mobile phones are extremely sensitive to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Medical implants

Patients with a heart stimulator must keep an large gap from magnets. The magnetism can interfere with the operation of the life-saving device.

Keep away from computers

Data protection: Neodymium magnets can damage data carriers and sensitive devices (heart implants, medical aids, timepieces).

Thermal limits

Keep cool. NdFeB magnets are susceptible to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Attention!

Need more info? Read our article: Why are neodymium magnets dangerous?

MPL 20x20x20 / N38 - lamellar magnet

MPL 20x20x20 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the product - data

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MW 38x12 / N38 - cylindrical magnet

UMT 12x20 red / N38 - board holder

MW 15x3 / N38 - cylindrical magnet

MPL 10x10x10 / N38 - lamellar magnet

Advantages as well as disadvantages of neodymium magnets.

Maximum lifting capacity of the magnet – what it depends on?

Practical lifting capacity: influencing factors

Safety rules for work with neodymium magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C