Product available Ships today (order by 14:00)

MPL 12x10x4 / N38 - lamellar magnet

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

lamellar magnet

Catalog no 020118

GTIN/EAN: 5906301811244

5.00

Load capacity 3.45 kg / 33.88 N Magnetic Induction 340.59 mT / 3406 Gs

length: 12 mm [±0,1 mm]
Width: 10 mm [±0,1 mm]
Height: 4 mm [±0,1 mm]
Weight: 3.6 g
Magnetization Direction: ↑ axial
Coating: [NiCuNi] Nickel

How we measure these parameters — certificates and measurements

view specifications »

1.380 zł net / pcs

1.697 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?

Quantity

Net

Gross

price from 1 pcs

1.380 zł

1.697 zł

price from 450 pcs

1.297 zł

1.596 zł

price from 1850 pcs

1.214 zł

1.494 zł

Frequently asked questions

How much will a block magnet really hold?

The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.

What is the maximum working temperature?

Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.

What safety factor should I allow?

At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

Guides from the knowledge base

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

PDF report Calculator

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

Order by 14:00 and we’ll ship today!

Technical data of the product - MPL 12x10x4 / N38 - lamellar magnet

Specification / characteristics - MPL 12x10x4 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020118
GTIN/EAN	5906301811244
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	12 mm [±0,1 mm]
Width	10 mm [±0,1 mm]
Height	4 mm [±0,1 mm]
Weight	3.6 g
Magnetization Direction	↑ axial
Load capacity ~ ?	3.45 kg / 33.88 N
Magnetic Induction ~ ?	340.59 mT / 3406 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 12x10x4 / N38 - lamellar magnet

properties	values	units
Remanence Br ?	12.2-12.6	kGs
Remanence Br ?	1220-1260	mT
Coercivity bHc ?	10.8-11.5	kOe
Coercivity bHc ?	860-915	kA/m
Intrinsic coercivity iHc	≥ 12	kOe
Intrinsic coercivity iHc	≥ 955	kA/m
Energy product BHmax ?	36-38	BH max MGOe
Energy product BHmax ?	287-303	BH max KJ/m
Maximum working 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	310	°C
Curie Temperature TF	590	°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 simulation of the assembly - data

These data are the outcome of a physical analysis. Values rely on algorithms for the class Nd₂Fe₁₄B. Real-world performance might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - characteristics
MPL 12x10x4 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	3404 Gs 340.4 mT	3.45 kg / 7.61 pounds 3450.0 g / 33.8 N	medium risk
1 mm	2920 Gs 292.0 mT	2.54 kg / 5.60 pounds 2538.8 g / 24.9 N	medium risk
2 mm	2399 Gs 239.9 mT	1.71 kg / 3.78 pounds 1713.7 g / 16.8 N	weak grip
3 mm	1919 Gs 191.9 mT	1.10 kg / 2.42 pounds 1096.3 g / 10.8 N	weak grip
5 mm	1190 Gs 119.0 mT	0.42 kg / 0.93 pounds 421.6 g / 4.1 N	weak grip
10 mm	392 Gs 39.2 mT	0.05 kg / 0.10 pounds 45.7 g / 0.4 N	weak grip
15 mm	162 Gs 16.2 mT	0.01 kg / 0.02 pounds 7.8 g / 0.1 N	weak grip
20 mm	80 Gs 8.0 mT	0.00 kg / 0.00 pounds 1.9 g / 0.0 N	weak grip
30 mm	27 Gs 2.7 mT	0.00 kg / 0.00 pounds 0.2 g / 0.0 N	weak grip
50 mm	7 Gs 0.7 mT	0.00 kg / 0.00 pounds 0.0 g / 0.0 N	weak grip

Grip strength drops sharply with every subsequent millimeter of gap. Remember that even a very thin break (e.g., dirt, varnish, rust) strongly reduces the pull force. Neodymiums work most effectively at the point of direct contact; gap kills the power. Observe how rapidly the pull force fall, when the magnet does not adhere directly to the steel surface. When planning the assembly, avoid unnecessary gaps.

Table 2: Sliding load (wall)
MPL 12x10x4 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	0.69 kg / 1.52 pounds 690.0 g / 6.8 N
1 mm	Stal (~0.2)	0.51 kg / 1.12 pounds 508.0 g / 5.0 N
2 mm	Stal (~0.2)	0.34 kg / 0.75 pounds 342.0 g / 3.4 N
3 mm	Stal (~0.2)	0.22 kg / 0.49 pounds 220.0 g / 2.2 N
5 mm	Stal (~0.2)	0.08 kg / 0.19 pounds 84.0 g / 0.8 N
10 mm	Stal (~0.2)	0.01 kg / 0.02 pounds 10.0 g / 0.1 N
15 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 2.0 g / 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N

The table below indicates the theoretical force necessary to initiate the shifting of the magnet down on a upright steel wall (assuming standard friction). The holding force is a function of the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 12x10x4 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.04 kg / 2.28 pounds 1035.0 g / 10.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.69 kg / 1.52 pounds 690.0 g / 6.8 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.35 kg / 0.76 pounds 345.0 g / 3.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.73 kg / 3.80 pounds 1725.0 g / 16.9 N

When hanging a element on a upright wall (e.g., a board), it you can count on barely approx. 1/5 of its maximum pull force. Gravity and a low friction coefficient mean that products move down easier than they pop off the substrate. Planning a hanger? Consider that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a significantly smaller load. Using a rubber pad can significantly improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 12x10x4 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.35 kg / 0.76 pounds 345.0 g / 3.4 N
1 mm	25%	0.86 kg / 1.90 pounds 862.5 g / 8.5 N
2 mm	50%	1.73 kg / 3.80 pounds 1725.0 g / 16.9 N
3 mm	75%	2.59 kg / 5.70 pounds 2587.5 g / 25.4 N
5 mm	100%	3.45 kg / 7.61 pounds 3450.0 g / 33.8 N
10 mm	100%	3.45 kg / 7.61 pounds 3450.0 g / 33.8 N
11 mm	100%	3.45 kg / 7.61 pounds 3450.0 g / 33.8 N
12 mm	100%	3.45 kg / 7.61 pounds 3450.0 g / 33.8 N

A thin metal plate is unable to focus the entire magnetic field, which squanders power of the holder. Should you mount a strong magnet to a weak sheet, the flux will pass right through and the attraction force will be weaker. To achieve full efficiency of this magnet's power, you require a sufficiently solid piece of steel. The saturation effect means that on delicate walls (e.g., car bodies), the magnet shows lower pull force. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 12x10x4 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	3.45 kg / 7.61 pounds 3450.0 g / 33.8 N	OK
40 °C	-2.2%	3.37 kg / 7.44 pounds 3374.1 g / 33.1 N	OK
60 °C	-4.4%	3.30 kg / 7.27 pounds 3298.2 g / 32.4 N
80 °C	-6.6%	3.22 kg / 7.10 pounds 3222.3 g / 31.6 N
100 °C	-28.8%	2.46 kg / 5.42 pounds 2456.4 g / 24.1 N

Ordinary NdFeB products irreversibly lose strength above the temperature limit. Protect against heat – excessive heat can permanently damage this magnet. As the temperature rises, the magnet's capacity momentarily drops. Avoid using this magnet near heat sources exceeding its operating temperature limit. Ignoring the limit will cause destruction of magnetism.

*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) are more susceptible to demagnetization sooner than long magnets. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field collision
MPL 12x10x4 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Lateral Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	8.57 kg / 18.90 pounds 4 915 Gs	1.29 kg / 2.84 pounds 1286 g / 12.6 N	N/A
1 mm	7.46 kg / 16.44 pounds 6 349 Gs	1.12 kg / 2.47 pounds 1118 g / 11.0 N	6.71 kg / 14.79 pounds ~0 Gs
2 mm	6.31 kg / 13.91 pounds 5 841 Gs	0.95 kg / 2.09 pounds 946 g / 9.3 N	5.68 kg / 12.52 pounds ~0 Gs
3 mm	5.23 kg / 11.53 pounds 5 317 Gs	0.78 kg / 1.73 pounds 784 g / 7.7 N	4.71 kg / 10.37 pounds ~0 Gs
5 mm	3.42 kg / 7.55 pounds 4 302 Gs	0.51 kg / 1.13 pounds 513 g / 5.0 N	3.08 kg / 6.79 pounds ~0 Gs
10 mm	1.05 kg / 2.31 pounds 2 380 Gs	0.16 kg / 0.35 pounds 157 g / 1.5 N	0.94 kg / 2.08 pounds ~0 Gs
20 mm	0.11 kg / 0.25 pounds 784 Gs	0.02 kg / 0.04 pounds 17 g / 0.2 N	0.10 kg / 0.23 pounds ~0 Gs
50 mm	0.00 kg / 0.00 pounds 90 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
60 mm	0.00 kg / 0.00 pounds 55 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
70 mm	0.00 kg / 0.00 pounds 36 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
80 mm	0.00 kg / 0.00 pounds 25 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
90 mm	0.00 kg / 0.00 pounds 18 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
100 mm	0.00 kg / 0.00 pounds 13 Gs	0.00 kg / 0.00 pounds 0 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs

Two magnetic products attract each other from a much further distance than a magnet and steel combination. The connection of magnet-to-magnet generates a stronger field and a further horizon of action. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a steel. Remember that when connecting a pair of magnets, the impact force is huge. The levitation is a bit weaker than the attraction, but still large.
*The magnetic induction for N-N configuration reaches ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Important: Results apply to shear force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - warnings
MPL 12x10x4 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	6.0 cm
Hearing aid	10 Gs (1.0 mT)	4.5 cm
Mechanical watch	20 Gs (2.0 mT)	3.5 cm
Mobile device	40 Gs (4.0 mT)	3.0 cm
Car key	50 Gs (5.0 mT)	2.5 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Powerful magnet radiation is a serious hazard to electronics as well as medical implants. These magnets produce a flux that disrupts operation of digital equipment. Be aware: the unseen radiation acts through matter and glass. Special caution must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, remotes, speakers, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
MPL 12x10x4 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	24.85 km/h (6.90 m/s)	0.09 J
30 mm	25.03 km/h (6.95 m/s)	0.09 J
50 mm	25.03 km/h (6.95 m/s)	0.09 J
100 mm	25.04 km/h (6.96 m/s)	0.09 J

NdFeB products are very brittle – a collision with steel risks their cracking. Control the attraction moment – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or painful pinches to fingers. Hold the magnet firmly during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear eye protection when playing with powerful specimens.

Table 9: Coating parameters (durability)
MPL 12x10x4 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MPL 12x10x4 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	4 295 Mx	42.9 µWb
P_c Coefficient	0.43	Low (Flat)

Total magnetic flux passing through the pole surface. Essential parameter for generator designers as well as sensors. The P_c coefficient determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 12x10x4 / N38

Environment	Effective steel pull	Effect
Air (land)	3.45 kg	Standard
Water (riverbed)	3.95 kg (+0.50 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.

In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains only a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Power loss vs temp

*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) = 0.43

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 specification and ecology

Chemical composition

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: 020118-2026

Quick Unit Converter

Force (pull)

Force in kg

Newtons (N)

Force in lbs

Magnetic Field

Tesla (T)

Input a figure in a single slot to see the conversion in the other fields immediately.

Other offers

Product available Ships today (order by 14:00)

HH 16x5.3 [M3] / N38 - through hole magnetic holder

3.32 zł brutto / pcs

Product available Ships today (order by 14:00)

MPL 40x20x10 / N38 - lamellar magnet

31.00 zł brutto / pcs

Product available Ships today (order by 14:00)

UMT 12x20 black / N38 - board holder

1.894 zł brutto / pcs

Product available Ships today (order by 14:00)

MPL 30x15x2 / N38 - lamellar magnet

3.89 zł brutto / pcs

Component MPL 12x10x4 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. This magnetic block with a force of 33.88 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.

The key to success is shifting 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 3.45 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.

They constitute a key element in the production of generators and material handling systems. They work great as invisible mounts under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.

For mounting flat magnets MPL 12x10x4 / N38, it is best to use two-component adhesives (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).

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.

This model is characterized by dimensions 12x10x4 mm, which, at a weight of 3.6 g, makes it an element with high energy density. It is a magnetic block with dimensions 12x10x4 mm and a self-weight of 3.6 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.

Advantages

Besides their exceptional field intensity, neodymium magnets offer the following advantages:

They do not lose magnetism, even during approximately ten years – the drop in lifting capacity is only ~1% (theoretically),
Magnets perfectly resist against demagnetization caused by ambient magnetic noise,
By using a smooth layer of gold, the element has an elegant look,
Magnets are distinguished by maximum magnetic induction on the surface,
Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
Thanks to versatility in shaping and the ability to adapt to specific needs,
Huge importance in innovative solutions – they are used in HDD drives, brushless drives, precision medical tools, and complex engineering applications.
Thanks to their power density, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of neodymium magnets:

They are fragile 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 increases its resistance to damage
When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength 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
They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
We suggest cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated forms.
Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Additionally, small elements of these magnets are able to be problematic in diagnostics medical after entering the body.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Magnetic strength at its maximum – what it depends on?

The lifting capacity listed is a measurement result performed under standard conditions:

using a sheet made of high-permeability steel, functioning as a circuit closing element
whose transverse dimension equals approx. 10 mm
with an ideally smooth touching surface
without any air gap between the magnet and steel
for force acting at a right angle (in the magnet axis)
at conditions approx. 20°C

Key elements affecting lifting force

Bear in mind that the application force will differ depending on elements below, in order of importance:

Gap (betwixt the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
Base massiveness – insufficiently thick steel causes magnetic saturation, causing part of the power to be escaped into the air.
Steel grade – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
Thermal factor – high temperature reduces magnetic field. 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, in contrast under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate decreases the holding force.

Safety rules for work with neodymium magnets

Demagnetization risk

Standard neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. Damage is permanent.

Fire warning

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Allergic reactions

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

Bone fractures

Risk of injury: The pulling power is so immense that it can result in hematomas, crushing, and even bone fractures. Use thick gloves.

Product not for children

Neodymium magnets are not toys. Eating multiple magnets may result in them pinching intestinal walls, which poses a direct threat to life and requires immediate surgery.

Fragile material

Despite the nickel coating, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Do not underestimate power

Exercise caution. Neodymium magnets attract from a distance and connect with huge force, often faster than you can react.

Threat to navigation

A strong magnetic field negatively affects the operation of magnetometers in smartphones and navigation systems. Do not bring magnets near a smartphone to prevent damaging the sensors.

Medical interference

Individuals with a heart stimulator should maintain an safe separation from magnets. The magnetic field can stop the functioning of the life-saving device.

Cards and drives

Very strong magnetic fields can destroy records on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Warning! Want to know more? Read our article: Why are neodymium magnets dangerous?

MPL 12x10x4 / N38 - lamellar magnet

Technical data of the product - MPL 12x10x4 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the assembly - data

Table 1: Static force (force vs distance) - characteristics MPL 12x10x4 / N38

Table 2: Sliding load (wall) MPL 12x10x4 / N38

Table 3: Vertical assembly (shearing) - vertical pull MPL 12x10x4 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection MPL 12x10x4 / N38

Table 5: Thermal resistance (material behavior) - thermal limit MPL 12x10x4 / N38

Table 6: Two magnets (attraction) - field collision MPL 12x10x4 / N38

Table 7: Protective zones (implants) - warnings MPL 12x10x4 / N38

Table 8: Impact energy (cracking risk) - warning MPL 12x10x4 / N38

Table 9: Coating parameters (durability) MPL 12x10x4 / N38

Table 10: Electrical data (Flux) MPL 12x10x4 / N38

Table 11: Underwater work (magnet fishing) MPL 12x10x4 / N38

1. Wall mount (shear)

2. Steel thickness impact

3. Power loss vs temp

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

Chemical composition

Environmental data

Force (pull)

Magnetic Field

Other offers

HH 16x5.3 [M3] / N38 - through hole magnetic holder

MPL 40x20x10 / N38 - lamellar magnet

UMT 12x20 black / N38 - board holder

MPL 30x15x2 / N38 - lamellar magnet

Pros as well as cons of rare earth magnets.

Advantages

Cons

Lifting parameters

Magnetic strength at its maximum – what it depends on?

Key elements affecting lifting force

Safety rules for work with neodymium magnets

Demagnetization risk

Fire warning

Allergic reactions

Bone fractures

Product not for children

Fragile material

Do not underestimate power

Threat to navigation

Medical interference

Cards and drives

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs distance) - characteristics
MPL 12x10x4 / N38

Table 2: Sliding load (wall)
MPL 12x10x4 / N38

Table 3: Vertical assembly (shearing) - vertical pull
MPL 12x10x4 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 12x10x4 / N38

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 12x10x4 / N38

Table 6: Two magnets (attraction) - field collision
MPL 12x10x4 / N38

Table 7: Protective zones (implants) - warnings
MPL 12x10x4 / N38

Table 8: Impact energy (cracking risk) - warning
MPL 12x10x4 / N38

Table 9: Coating parameters (durability)
MPL 12x10x4 / N38

Table 10: Electrical data (Flux)
MPL 12x10x4 / N38

Table 11: Underwater work (magnet fishing)
MPL 12x10x4 / N38