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MPL 40x18x10 SH / N38 - lamellar magnet

lamellar magnet

Catalog no 020157

GTIN: 5906301811633

5.00

length

40 mm [±0,1 mm]

Width

18 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

54 g

Magnetization Direction

↑ axial

Load capacity

29.27 kg / 287.13 N

Magnetic Induction

366.66 mT

Coating

[NiCuNi] Nickel

36.29 ZŁ with VAT / pcs + price for transport

29.50 ZŁ net + 23% VAT / pcs

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MPL 40x18x10 SH / N38 - lamellar magnet

Specification / characteristics MPL 40x18x10 SH / N38 - lamellar magnet

properties

properties	values
Cat. no.	020157
GTIN	5906301811633
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	18 mm [±0,1 mm]
Height	10 mm [±0,1 mm]
Weight	54 g
Magnetization Direction	↑ axial
Load capacity ~ ?	29.27 kg / 287.13 N
Magnetic Induction ~ ?	366.66 mT
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x18x10 SH / 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 product - data

The following values are the outcome of a physical analysis. Results were calculated on algorithms for the class NdFeB. Actual performance might slightly differ. Treat these data as a supplementary guide for designers.

Table 1: Static pull force (force vs distance) - characteristics
MPL 40x18x10 SH / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	4949 Gs 494.9 mT	29.27 kg / 29270.0 g 287.1 N	crushing
1 mm	4589 Gs 458.9 mT	25.17 kg / 25171.5 g 246.9 N	crushing
2 mm	4212 Gs 421.2 mT	21.20 kg / 21200.7 g 208.0 N	crushing
5 mm	2321 Gs 232.1 mT	6.44 kg / 6440.2 g 63.2 N	medium risk
10 mm	1370 Gs 137.0 mT	2.24 kg / 2242.4 g 22.0 N	medium risk
15 mm	833 Gs 83.3 mT	0.83 kg / 829.0 g 8.1 N	low risk
20 mm	530 Gs 53.0 mT	0.34 kg / 336.0 g 3.3 N	low risk
30 mm	244 Gs 24.4 mT	0.07 kg / 71.0 g 0.7 N	low risk
50 mm	75 Gs 7.5 mT	0.01 kg / 6.7 g 0.1 N	low risk

Pulling power weakens sharply with every mm of spacing. Keep in mind that every additional insulation layer (e.g., dirt, varnish, veneer) noticeably diminishes the holding power. Magnetic products work strongest during direct contact; air break kills the power. Notice how flashily the load capacity fall, when the magnet does not adhere flatly to the steel surface. When calculating the mounting, avoid redundant distances.

Table 2: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 40x18x10 SH / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	8.78 kg / 8781.0 g 86.1 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	5.85 kg / 5854.0 g 57.4 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	2.93 kg / 2927.0 g 28.7 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	14.64 kg / 14635.0 g 143.6 N

When mounting a magnet on a upright plane (e.g., a board), it you can count on barely approx. 1/5 of its maximum pull force. Gravitational force and a low friction coefficient mean that products slide down easier than they detach. Designing a hanger? Remember that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the holder will slide down under a significantly smaller load. Application of an anti-slip pad can effectively improve the result.

Table 3: Steel thickness (substrate influence) - power losses
MPL 40x18x10 SH / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	1.46 kg / 1463.5 g 14.4 N
1 mm	13%	3.66 kg / 3658.8 g 35.9 N
2 mm	25%	7.32 kg / 7317.5 g 71.8 N
5 mm	63%	18.29 kg / 18293.8 g 179.5 N
10 mm	100%	29.27 kg / 29270.0 g 287.1 N

A thin metal plate is unable to conduct the full magnetic flux, which squanders power of the magnet. Should you install a neodymium to a weak sheet, the flux will pass right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's potential, you need a suitably thick element of steel. The saturation effect causes that on sheet metal structures (e.g., appliance housings), the product shows lower pull force. We recommend selecting the steel thickness based on the following data.

Table 4: Thermal resistance (stability) - resistance threshold
MPL 40x18x10 SH / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	29.27 kg / 29270.0 g 287.1 N	OK
40 °C	-2.2%	28.63 kg / 28626.1 g 280.8 N	OK
60 °C	-4.4%	27.98 kg / 27982.1 g 274.5 N	OK
80 °C	-6.6%	27.34 kg / 27338.2 g 268.2 N
100 °C	-28.8%	20.84 kg / 20840.2 g 204.4 N

Classic neodymiums change their properties strength above the temperature limit. Watch out for overheating – high temperature can permanently damage this product. As the temperature rises, the neodymium's power briefly decreases. Do not use this magnet near heat sources higher than its operating temperature limit. Ignoring the limit will cause permanent loss of magnetic properties.

Table 5: Two magnets (attraction) - field range
MPL 40x18x10 SH / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	43.91 kg / 43905.0 g 430.7 N	N/A
2 mm	31.80 kg / 31800.0 g 312.0 N	29.68 kg / 29680.0 g 291.2 N
5 mm	9.66 kg / 9660.0 g 94.8 N	9.02 kg / 9016.0 g 88.4 N
10 mm	3.36 kg / 3360.0 g 33.0 N	3.14 kg / 3136.0 g 30.8 N
20 mm	0.51 kg / 510.0 g 5.0 N	0.48 kg / 476.0 g 4.7 N
50 mm	0.02 kg / 15.0 g 0.1 N	0.01 kg / 14.0 g 0.1 N

Two strong neodymiums interact from a significantly greater distance than a neodymium and metal setup. The connection of two magnets generates a stronger field and a larger range of performance. Want to build a strong closure? Apply two magnets instead of one magnet and a steel. Be careful that when attracting two neodymiums, the impact force is massive. The repulsion force is a bit weaker than the connection force, but still significant.

Table 6: Protective zones (electronics) - warnings
MPL 40x18x10 SH / 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
Timepiece	20 Gs (2.0 mT)	8.5 cm
Phone / Smartphone	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 electronics as well as pacemakers. These NdFeB products produce a flux that disrupts operation of digital equipment. Be aware: the invisible magnetic field passes through tissues and housings. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 7: Impact energy (kinetic energy) - collision effects
MPL 40x18x10 SH / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	24.58 km/h (6.83 m/s)	1.26 J
30 mm	40.73 km/h (11.31 m/s)	3.46 J
50 mm	52.51 km/h (14.59 m/s)	5.74 J
100 mm	74.25 km/h (20.63 m/s)	11.49 J

NdFeB products are delicate – a strong collision with metal risks their cracking. Control the attraction moment – a neodymium left loose speeds with massive force. Impact energy can trigger coating fragments or dangerous crushing to skin. Always hold the magnet 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 safety glasses when handling with large magnets.

Table 8: Surface protection spec
MPL 40x18x10 SH / 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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 9: Physics of underwater searching
MPL 40x18x10 SH / N38

Environment	Effective steel pull	Effect
Air (land)	29.27 kg	Standard
Water (riverbed)	33.51 kg (+4.24 kg Buoyancy gain)	+14.5%

Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.

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Component MPL 40x18x10 SH / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 29.27 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. To separate the MPL 40x18x10 SH / 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.

Plate magnets MPL 40x18x10 SH / 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. 29.27 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 40x18x10 SH / N38, we recommend utilizing 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. 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 (40x18 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 40x18x10 mm, which, at a weight of 54 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 40x18x10 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.

Strengths as well as weaknesses of NdFeB magnets.

Besides their exceptional strength, neodymium magnets offer the following advantages:

They virtually do not lose strength, because even after ten years the performance loss is only ~1% (based on calculations),
Neodymium magnets are exceptionally resistant to demagnetization caused by magnetic disturbances,
By using a shiny layer of nickel, the element gains an modern look,
Neodymium magnets ensure maximum magnetic induction on a small area, which allows for strong attraction,
Neodymium magnets are characterized by very 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 accurate forming as well as optimizing to defined conditions,
Huge importance in innovative solutions – they are commonly used in computer drives, motor assemblies, diagnostic systems, as well as technologically advanced constructions.
Thanks to their power density, small magnets offer high operating force, in miniature format,

Drawbacks and weaknesses of neodymium magnets and proposals for their use:

At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
NdFeB magnets demagnetize 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
They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
We recommend a housing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complex shapes.
Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small components of these devices can be problematic in diagnostics medical in case of swallowing.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Highest magnetic holding force – what contributes to it?

Magnet power is the result of a measurement for the most favorable conditions, including:

with the contact of a yoke made of special test steel, ensuring maximum field concentration
whose transverse dimension equals approx. 10 mm
characterized by lack of roughness
with direct contact (without impurities)
under axial force direction (90-degree angle)
at ambient temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

In practice, the actual lifting capacity depends on several key aspects, presented from most significant:

Air gap (between the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
Angle of force application – maximum parameter is reached only during perpendicular pulling. The force required to slide of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
Material composition – not every steel attracts identically. Alloy additives weaken the attraction effect.
Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
Temperature influence – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. In addition, even a small distance {between} the magnet and the plate decreases the holding force.

Precautions when working with NdFeB magnets

Thermal limits

Keep cool. Neodymium magnets are susceptible to heat. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Allergy Warning

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, immediately stop handling magnets and use protective gear.

Beware of splinters

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Fire warning

Fire hazard: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.

Crushing force

Watch your fingers. Two powerful magnets will snap together immediately with a force of massive weight, crushing anything in their path. Be careful!

Life threat

Medical warning: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Threat to navigation

Be aware: rare earth magnets produce a field that disrupts precision electronics. Maintain a separation from your phone, device, and navigation systems.

Danger to the youngest

Product intended for adults. Tiny parts can be swallowed, causing serious injuries. Keep out of reach of children and animals.

Threat to electronics

Device Safety: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, timepieces).

Safe operation

Be careful. Rare earth magnets attract from a long distance and snap with huge force, often faster than you can move away.

Attention!

Learn more about risks in the article: Magnet Safety Guide.

MPL 40x18x10 SH / N38 - lamellar magnet

MPL 40x18x10 SH / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical simulation of the product - data

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Strengths as well as weaknesses of NdFeB magnets.

Highest magnetic holding force – what contributes to it?

Practical aspects of lifting capacity – factors

Precautions when working with NdFeB magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C