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MPL 50x20x5 / 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 020473

GTIN: 5906301811930

5.00

length

50 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

37.5 g

Magnetization Direction

↑ axial

Load capacity

15.6 kg / 153.01 N

Magnetic Induction

197.73 mT

Coating

[NiCuNi] Nickel

14.56 ZŁ with VAT / pcs + price for transport

11.84 ZŁ net + 23% VAT / pcs

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MPL 50x20x5 / N38 - lamellar magnet

Specification / characteristics MPL 50x20x5 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020473
GTIN	5906301811930
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	50 mm [±0,1 mm]
Width	20 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	37.5 g
Magnetization Direction	↑ axial
Load capacity ~ ?	15.6 kg / 153.01 N
Magnetic Induction ~ ?	197.73 mT
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x5 / 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 simulation of the magnet - data

Presented information constitute the outcome of a mathematical analysis. Results rely on models for the class NdFeB. Operational performance might slightly deviate from the simulation results. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs gap) - power drop
MPL 50x20x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2669 Gs 266.9 mT	15.60 kg / 15600.0 g 153.0 N	critical level
1 mm	2544 Gs 254.4 mT	14.17 kg / 14174.3 g 139.1 N	critical level
2 mm	2393 Gs 239.3 mT	12.54 kg / 12538.9 g 123.0 N	critical level
5 mm	1395 Gs 139.5 mT	4.26 kg / 4263.2 g 41.8 N	medium risk
10 mm	870 Gs 87.0 mT	1.66 kg / 1658.9 g 16.3 N	safe
15 mm	549 Gs 54.9 mT	0.66 kg / 658.9 g 6.5 N	safe
20 mm	359 Gs 35.9 mT	0.28 kg / 282.6 g 2.8 N	safe
30 mm	172 Gs 17.2 mT	0.06 kg / 64.5 g 0.6 N	safe
50 mm	54 Gs 5.4 mT	0.01 kg / 6.4 g 0.1 N	safe

Grip strength decreases drastically with every mm of distance. Remember that every additional insulation layer (e.g., dirt, varnish, dust) significantly diminishes the holding power. Magnets hold strongest during direct contact; gap nullifies the power. Observe how flashily the parameters plummet, when the magnet does not touch tightly to the steel surface. When planning the arrangement, avoid unnecessary gaps.

Table 2: Wall mounting (sliding) - behavior on slippery surfaces
MPL 50x20x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	4.68 kg / 4680.0 g 45.9 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	3.12 kg / 3120.0 g 30.6 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.56 kg / 1560.0 g 15.3 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	7.80 kg / 7800.0 g 76.5 N

When mounting a element on a vertical wall (e.g., a fridge), it will only hold barely about 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip mean that products move down faster than they pull off. Designing a vertical fastening? Remember that the shear force is much weaker than the maximum static pull force. On a slippery surface, the magnet will slide down under a significantly smaller load. Using a rubber pad can drastically increase the grip.

Table 3: Material efficiency (saturation) - sheet metal selection
MPL 50x20x5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	0.78 kg / 780.0 g 7.7 N
1 mm	13%	1.95 kg / 1950.0 g 19.1 N
2 mm	25%	3.90 kg / 3900.0 g 38.3 N
5 mm	63%	9.75 kg / 9750.0 g 95.6 N
10 mm	100%	15.60 kg / 15600.0 g 153.0 N

A too thin steel is unable to conduct the entire magnetic field, which squanders power of the holder. If you attach a powerful product to a thin surface, the magnetism will pass right through and the holding will be smaller. To achieve the maximum of this magnet's power, you require a sufficiently solid piece of metal. The material oversaturation causes that on sheet metal structures (e.g., thin profiles), the holder works worse. We advise picking the steel cross-section according to the table below.

Table 4: Thermal resistance (material behavior) - power drop
MPL 50x20x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	15.60 kg / 15600.0 g 153.0 N	OK
40 °C	-2.2%	15.26 kg / 15256.8 g 149.7 N	OK
60 °C	-4.4%	14.91 kg / 14913.6 g 146.3 N	OK
80 °C	-6.6%	14.57 kg / 14570.4 g 142.9 N
100 °C	-28.8%	11.11 kg / 11107.2 g 109.0 N

Standard neodymium magnets change their properties parameters above the temperature limit. Avoid high temperatures – excessive heat can permanently destroy this magnet. With every degree above norm, the neodymium's capacity temporarily drops. Refrain from using this product close to heaters higher than its working range. Too high temperature will result in irreversible degradation of magnetism.

Table 5: Magnet-Magnet interaction (repulsion) - field range
MPL 50x20x5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	23.40 kg / 23400.0 g 229.6 N	N/A
2 mm	18.81 kg / 18810.0 g 184.5 N	17.56 kg / 17556.0 g 172.2 N
5 mm	6.39 kg / 6390.0 g 62.7 N	5.96 kg / 5964.0 g 58.5 N
10 mm	2.49 kg / 2490.0 g 24.4 N	2.32 kg / 2324.0 g 22.8 N
20 mm	0.42 kg / 420.0 g 4.1 N	0.39 kg / 392.0 g 3.8 N
50 mm	0.02 kg / 15.0 g 0.1 N	0.01 kg / 14.0 g 0.1 N

Two magnetic products attract each other from a much further distance than a magnet and sheet setup. Such a system of magnet-to-magnet generates a stronger field and a wider radius of performance. Planning to create a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the impact force is huge. The repulsion force is a bit weaker than the attraction, but still significant.

Table 6: Protective zones (implants) - precautionary measures
MPL 50x20x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	12.5 cm
Hearing aid	10 Gs (1.0 mT)	9.5 cm
Timepiece	20 Gs (2.0 mT)	7.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	6.0 cm
Remote	50 Gs (5.0 mT)	5.5 cm
Payment card	400 Gs (40.0 mT)	2.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.5 cm

Powerful magnet radiation is a large risk to IT equipment and medical implants. These magnets produce a flux that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation penetrates the body and glass. Special caution must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 7: Impact energy (cracking risk) - collision effects
MPL 50x20x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	21.89 km/h (6.08 m/s)	0.69 J
30 mm	35.72 km/h (9.92 m/s)	1.85 J
50 mm	46.01 km/h (12.78 m/s)	3.06 J
100 mm	65.05 km/h (18.07 m/s)	6.12 J

Neodymium magnets are prone to chipping – a violent impact against metal causes immediate chipping. Watch the impact speed – a magnet released freely becomes dangerous. Impact energy can destroy the magnet or injury to skin. Always hold the magnet during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when playing with powerful specimens.

Table 8: Corrosion resistance
MPL 50x20x5 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 9: Underwater work (magnet fishing)
MPL 50x20x5 / N38

Environment	Effective steel pull	Effect
Air (land)	15.60 kg	Standard
Water (riverbed)	17.86 kg (+2.26 kg Buoyancy gain)	+14.5%

Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

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Component MPL 50x20x5 / N38 features a flat shape and industrial pulling force, making it an ideal solution for building separators and machines. As a block magnet with high power (approx. 15.6 kg), this product is available immediately from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.

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. Watch your fingers! Magnets with a force of 15.6 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 generators and material handling systems. Thanks to the flat surface and high force (approx. 15.6 kg), they are ideal as closers 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 50x20x5 / 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 (50x20 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.

This model is characterized by dimensions 50x20x5 mm, which, at a weight of 37.5 g, makes it an element with high energy density. It is a magnetic block with dimensions 50x20x5 mm and a self-weight of 37.5 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros and cons of neodymium magnets.

Apart from their superior power, neodymium magnets have these key benefits:

They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
They feature excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
Thanks to the shiny finish, the plating of nickel, gold-plated, or silver gives an clean appearance,
The surface of neodymium magnets generates a intense 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...
In view of the ability of free molding and adaptation to specialized solutions, NdFeB magnets can be manufactured in a wide range of geometric configurations, which expands the range of possible applications,
Significant place in future technologies – they are used in HDD drives, drive modules, advanced medical instruments, also industrial machines.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in compact constructions

What to avoid - cons of neodymium magnets and proposals for their use:

They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
Due to limitations in creating threads and complicated shapes in magnets, we propose using casing - magnetic holder.
Possible danger resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
Due to complex production process, their price is relatively high,

Magnetic strength at its maximum – what contributes to it?

The declared magnet strength represents the limit force, measured under ideal test conditions, meaning:

on a plate made of mild steel, effectively closing the magnetic field
possessing a thickness of minimum 10 mm to ensure full flux closure
characterized by lack of roughness
without the slightest insulating layer between the magnet and steel
during detachment in a direction perpendicular to the mounting surface
at ambient temperature room level

Lifting capacity in real conditions – factors

During everyday use, the actual holding force is determined by a number of factors, listed from most significant:

Clearance – existence of foreign body (rust, tape, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
Direction of force – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
Steel thickness – too thin steel does not close the flux, causing part of the power to be escaped into the air.
Material type – the best choice is pure iron steel. Stainless steels may attract less.
Surface finish – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under shearing force the holding force is lower. Additionally, even a small distance {between} the magnet’s surface and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets

Machining danger

Dust generated during grinding of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

This is not a toy

Always store magnets away from children. Choking hazard is high, and the effects of magnets connecting inside the body are life-threatening.

Warning for heart patients

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Protect data

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

Do not underestimate power

Handle with care. Rare earth magnets act from a long distance and connect with huge force, often faster than you can react.

Risk of cracking

Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

GPS Danger

Navigation devices and smartphones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.

Nickel coating and allergies

A percentage of the population suffer from a sensitization to Ni, which is the typical protective layer for neodymium magnets. Extended handling can result in an allergic reaction. We strongly advise wear safety gloves.

Heat sensitivity

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Bone fractures

Large magnets can break fingers in a fraction of a second. Never place your hand betwixt two strong magnets.

Caution!

More info about risks in the article: Safety of working with magnets.

MPL 50x20x5 / N38 - lamellar magnet

MPL 50x20x5 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical simulation of the magnet - data

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Pros and cons of neodymium magnets.

Magnetic strength at its maximum – what contributes to it?

Lifting capacity in real conditions – factors

Safe handling of NdFeB magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C