Product available Ships tomorrow

MPL 30x20x5 / N38 - lamellar magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

lamellar magnet

Catalog no 020143

GTIN/EAN: 5906301811497

5.00

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

22.5 g

Magnetization Direction

↑ axial

Load capacity

8.86 kg / 86.90 N

Magnetic Induction

220.03 mT / 2200 Gs

Coating

[NiCuNi] Nickel

9.10 ZŁ with VAT / pcs + price for transport

7.40 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

7.40 ZŁ

9.10 ZŁ

price from 100 pcs

6.96 ZŁ

8.56 ZŁ

price from 350 pcs

6.51 ZŁ

8.01 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Not sure which magnet to buy?

Call us +48 22 499 98 98 if you prefer send us a note through contact form the contact form page.
Parameters as well as structure of neodymium magnets can be analyzed using our force calculator.

Same-day shipping for orders placed before 14:00.

MPL 30x20x5 / N38 - lamellar magnet

Specification / characteristics MPL 30x20x5 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020143
GTIN/EAN	5906301811497
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	30 mm [±0,1 mm]
Width	20 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	22.5 g
Magnetization Direction	↑ axial
Load capacity ~ ?	8.86 kg / 86.90 N
Magnetic Induction ~ ?	220.03 mT / 2200 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x5 / 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

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 modeling of the product - data

Presented information represent the outcome of a physical analysis. Values were calculated on models for the class Nd₂Fe₁₄B. Actual parameters may deviate from the simulation results. Treat these data as a supplementary guide for designers.

Table 1: Static force (pull vs gap) - characteristics
MPL 30x20x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2200 Gs 220.0 mT	8.86 kg / 8860.0 g 86.9 N	warning
1 mm	2092 Gs 209.2 mT	8.01 kg / 8013.9 g 78.6 N	warning
2 mm	1961 Gs 196.1 mT	7.04 kg / 7042.1 g 69.1 N	warning
3 mm	1817 Gs 181.7 mT	6.04 kg / 6041.8 g 59.3 N	warning
5 mm	1516 Gs 151.6 mT	4.21 kg / 4209.6 g 41.3 N	warning
10 mm	892 Gs 89.2 mT	1.46 kg / 1456.2 g 14.3 N	weak grip
15 mm	519 Gs 51.9 mT	0.49 kg / 492.4 g 4.8 N	weak grip
20 mm	313 Gs 31.3 mT	0.18 kg / 179.8 g 1.8 N	weak grip
30 mm	132 Gs 13.2 mT	0.03 kg / 31.9 g 0.3 N	weak grip
50 mm	37 Gs 3.7 mT	0.00 kg / 2.5 g 0.0 N	weak grip

Magnetic force drops sharply with every subsequent millimeter of distance. Remember that even the smallest gap (e.g., contamination, paint, veneer) significantly weakens the grip. Magnets hold optimally at the point of direct contact; air break nullifies the force. See how flashily the load capacity drop, when the magnet does not adhere directly to the steel surface. When calculating the arrangement, discard unnecessary gaps.

Table 2: Shear Capacity (Vertical Surface)
MPL 30x20x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	1.77 kg / 1772.0 g 17.4 N
1 mm	Stal (~0.2)	1.60 kg / 1602.0 g 15.7 N
2 mm	Stal (~0.2)	1.41 kg / 1408.0 g 13.8 N
3 mm	Stal (~0.2)	1.21 kg / 1208.0 g 11.9 N
5 mm	Stal (~0.2)	0.84 kg / 842.0 g 8.3 N
10 mm	Stal (~0.2)	0.29 kg / 292.0 g 2.9 N
15 mm	Stal (~0.2)	0.10 kg / 98.0 g 1.0 N
20 mm	Stal (~0.2)	0.04 kg / 36.0 g 0.4 N
30 mm	Stal (~0.2)	0.01 kg / 6.0 g 0.1 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The table below defines the estimated weight limit needed to start the sliding of the magnet vertically against a upright metal surface (considering typical friction coefficient). This parameter varies with the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MPL 30x20x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.66 kg / 2658.0 g 26.1 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.77 kg / 1772.0 g 17.4 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.89 kg / 886.0 g 8.7 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	4.43 kg / 4430.0 g 43.5 N

When mounting a holder on a vertical plane (e.g., a fridge), it will maintain barely about 1/5 of its maximum pull force. Gravity and a weak degree of grip cause that products slip faster than they pull off. Designing a wall mount? Remember that the shear force is much weaker than the maximum static pull force. On a smooth steel, the magnet will give way down under a noticeably lighter load. Using a rubber pad can significantly raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 30x20x5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.89 kg / 886.0 g 8.7 N
1 mm	25%	2.22 kg / 2215.0 g 21.7 N
2 mm	50%	4.43 kg / 4430.0 g 43.5 N
5 mm	100%	8.86 kg / 8860.0 g 86.9 N
10 mm	100%	8.86 kg / 8860.0 g 86.9 N

A thin sheet is incapable of conduct the full magnetic flux, which weakens actual performance of the magnet. If you mount a strong magnet to a too thin substrate, the magnetism will pass right through and the attraction force will be weaker. To achieve the maximum of this magnet's power, you require a sufficiently solid element of metal. The saturation phenomenon means that on sheet metal structures (e.g., car bodies), the product shows lower pull force. We recommend selecting the steel thickness from these parameters.

Table 5: Working in heat (stability) - resistance threshold
MPL 30x20x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	8.86 kg / 8860.0 g 86.9 N	OK
40 °C	-2.2%	8.67 kg / 8665.1 g 85.0 N	OK
60 °C	-4.4%	8.47 kg / 8470.2 g 83.1 N
80 °C	-6.6%	8.28 kg / 8275.2 g 81.2 N
100 °C	-28.8%	6.31 kg / 6308.3 g 61.9 N

Standard neodymium magnets lose strength after exceeding the maximum temperature. Protect against heat – excessive heat can permanently damage this product. With increasing heat, the neodymium's power briefly lowers. Do not use this product close to ovens higher than its safe range. Exceeding the critical threshold will result in permanent loss of magnetism.

*Technical advisory: Thermal stability is determined by both grade, but also on the magnet's shape. Low-profile magnets (low Pc) are more susceptible to demagnetization under lower heat stress than taller cylinders. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MPL 30x20x5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	17.90 kg / 17902 g 175.6 N 3 715 Gs	N/A
1 mm	17.10 kg / 17097 g 167.7 N 4 300 Gs	15.39 kg / 15387 g 150.9 N ~0 Gs
2 mm	16.19 kg / 16192 g 158.8 N 4 184 Gs	14.57 kg / 14573 g 143.0 N ~0 Gs
3 mm	15.23 kg / 15228 g 149.4 N 4 058 Gs	13.71 kg / 13706 g 134.5 N ~0 Gs
5 mm	13.22 kg / 13216 g 129.6 N 3 780 Gs	11.89 kg / 11894 g 116.7 N ~0 Gs
10 mm	8.51 kg / 8506 g 83.4 N 3 033 Gs	7.66 kg / 7655 g 75.1 N ~0 Gs
20 mm	2.94 kg / 2942 g 28.9 N 1 784 Gs	2.65 kg / 2648 g 26.0 N ~0 Gs
50 mm	0.15 kg / 146 g 1.4 N 398 Gs	0.13 kg / 132 g 1.3 N ~0 Gs

Two magnets interact from a much further distance than a magnet and sheet combination. The setup of two magnets produces a massive flux and a wider radius of action. Planning to create a solid fastener? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the impact force is huge. The levitation is a bit weaker than the connection force, but still large.
*The magnetic induction in repulsion mode is approximately ~0 Gs in the exact middle of the gap (due to field cancellation).

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 30x20x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	10.5 cm
Hearing aid	10 Gs (1.0 mT)	8.5 cm
Mechanical watch	20 Gs (2.0 mT)	6.5 cm
Mobile device	40 Gs (4.0 mT)	5.0 cm
Remote	50 Gs (5.0 mT)	4.5 cm
Payment card	400 Gs (40.0 mT)	2.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.5 cm

A strong magnetic field is a serious hazard to IT equipment and pacemakers. These neodymiums produce a flux that prevents correct functioning of digital equipment. Remember: the invisible magnetic field passes through tissues and plastic. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, car keys, speakers, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
MPL 30x20x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	21.97 km/h (6.10 m/s)	0.42 J
30 mm	34.74 km/h (9.65 m/s)	1.05 J
50 mm	44.76 km/h (12.43 m/s)	1.74 J
100 mm	63.29 km/h (17.58 m/s)	3.48 J

NdFeB products are very brittle – a violent impact against metal risks their cracking. Watch the impact speed – a neodymium left loose becomes dangerous. Striking energy can trigger coating fragments or dangerous crushing to fingers. Hold the magnet firmly during installation so it doesn't slam with momentum against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear safety glasses when working with large magnets.

Table 9: Coating parameters (durability)
MPL 30x20x5 / 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: Construction Data (Flux)
MPL 30x20x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	14 969 Mx	149.7 µWb
P_c Coefficient	0.26	Low (Flat)

Total magnetic flux emitted by the magnet pole. Essential parameter in coil applications and motors. P_c value determines the working geometry.

Table 11: Underwater work (magnet fishing)
MPL 30x20x5 / N38

Environment	Effective steel pull	Effect
Air (land)	8.86 kg	Standard
Water (riverbed)	10.14 kg (+1.28 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.

In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.

1. Vertical hold

*Note: On a vertical wall, the magnet retains only ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) drastically 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 P_c (Permeance Coefficient) = 0.26

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 P_c (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 P_c 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

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: 020143-2025

Magnet Unit Converter

Pulling Force

Force in kg

Force (N)

lbs

Magnetic Induction

Induction (Gs)

Tesla (T)

Put your value in just one field to generate results for the other units immediately.

Other offers

Product available Ships tomorrow

UMC 20x6/3x7 / N38 - cylindrical magnetic holder

6.99 ZŁ brutto / pcs

Product available Ships tomorrow

MW 20x2.5 / N38 - cylindrical magnet

2.51 ZŁ brutto / pcs

Product available Ships tomorrow

MPL 20x5x3 / N38 - lamellar magnet

1.058 ZŁ brutto / pcs

Product available Ships tomorrow

MW 2x10 / N38 - cylindrical magnet

0.1845 ZŁ brutto / pcs

Component MPL 30x20x5 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 86.90 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 sliding 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 30x20x5 / 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. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.

Plate magnets MPL 30x20x5 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 8.86 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.

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).

The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. 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: 30 mm (length), 20 mm (width), and 5 mm (thickness). The key parameter here is the holding force amounting to approximately 8.86 kg (force ~86.90 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Pros as well as cons of neodymium magnets.

Benefits

Besides their remarkable pulling force, neodymium magnets offer the following advantages:

They have constant strength, and over around 10 years their performance decreases symbolically – ~1% (in testing),
They are extremely resistant to demagnetization induced by presence of other magnetic fields,
A magnet with a smooth gold surface looks better,
Neodymium magnets ensure maximum magnetic induction on a small surface, which increases force concentration,
Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
Thanks to the possibility of flexible molding and adaptation to specialized needs, neodymium magnets can be created in a broad palette of geometric configurations, which expands the range of possible applications,
Wide application in modern industrial fields – they serve a role in data components, motor assemblies, medical devices, and technologically advanced constructions.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Drawbacks and weaknesses of neodymium magnets: tips and applications.

To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
Due to limitations in realizing nuts and complicated shapes in magnets, we propose using cover - magnetic holder.
Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

The specified lifting capacity represents the maximum value, obtained under ideal test conditions, specifically:

using a plate made of mild steel, serving as a magnetic yoke
whose transverse dimension is min. 10 mm
with a surface perfectly flat
with direct contact (no paint)
under vertical force direction (90-degree angle)
at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Bear in mind that the magnet holding may be lower depending on elements below, starting with the most relevant:

Space between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
Steel thickness – insufficiently thick plate does not close the flux, causing part of the flux to be wasted into the air.
Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Safe handling of NdFeB magnets

Nickel coating and allergies

A percentage of the population experience a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Extended handling can result in skin redness. We suggest wear safety gloves.

Do not drill into magnets

Machining of NdFeB material poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Powerful field

Use magnets with awareness. Their powerful strength can surprise even experienced users. Be vigilant and respect their force.

Danger to the youngest

Always keep magnets away from children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are fatal.

Medical implants

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Power loss in heat

Monitor thermal conditions. Exposing the magnet to high heat will permanently weaken its properties and pulling force.

Crushing risk

Pinching hazard: The attraction force is so immense that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.

Phone sensors

A strong magnetic field disrupts the functioning of magnetometers in smartphones and GPS navigation. Maintain magnets close to a device to prevent breaking the sensors.

Protective goggles

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Magnetic media

Do not bring magnets close to a wallet, laptop, or screen. The magnetism can permanently damage these devices and erase data from cards.

Safety First! More info about risks in the article: Magnet Safety Guide.

MPL 30x20x5 / N38 - lamellar magnet

Not sure which magnet to buy?

MPL 30x20x5 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the product - data

1. Vertical hold

2. Efficiency vs thickness

3. Heat tolerance

4. Demagnetization curve and operating point (B-H)

Material specification

Environmental data

Pulling Force

Magnetic Induction

Other offers

UMC 20x6/3x7 / N38 - cylindrical magnetic holder

MW 20x2.5 / N38 - cylindrical magnet

MPL 20x5x3 / N38 - lamellar magnet

MW 2x10 / N38 - cylindrical magnet

Pros as well as cons of neodymium magnets.

Benefits

Cons

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

What influences lifting capacity in practice

Nickel coating and allergies

Do not drill into magnets

Powerful field

Danger to the youngest

Medical implants

Power loss in heat

Crushing risk

Phone sensors

Protective goggles

Magnetic media

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C