Product available Ships tomorrow

MW 40x8 / N38 - cylindrical magnet

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

cylindrical magnet

Catalog no 010069

GTIN/EAN: 5906301810681

5.00

Diameter Ø

40 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

75.4 g

Magnetization Direction

↑ axial

Load capacity

20.43 kg / 200.39 N

Magnetic Induction

230.22 mT / 2302 Gs

Coating

[NiCuNi] Nickel

product details »

31.27 ZŁ with VAT / pcs + price for transport

25.42 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

25.42 ZŁ

31.27 ZŁ

price from 30 pcs

23.89 ZŁ

29.39 ZŁ

price from 100 pcs

22.37 ZŁ

27.51 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Do you have a dilemma?

Give us a call +48 888 99 98 98 if you prefer send us a note via inquiry form the contact form page.
Parameters along with form of neodymium magnets can be calculated on our magnetic calculator.

Order by 14:00 and we’ll ship today!

Product card - MW 40x8 / N38 - cylindrical magnet

Specification / characteristics - MW 40x8 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010069
GTIN/EAN	5906301810681
Production/Distribution	Dhit sp. z o.o. ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin	Poland / China / Germany
Customs code	85059029
Diameter Ø	40 mm [±0,1 mm]
Height	8 mm [±0,1 mm]
Weight	75.4 g
Magnetization Direction	↑ axial
Load capacity ~ ?	20.43 kg / 200.39 N
Magnetic Induction ~ ?	230.22 mT / 2302 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x8 / N38 - cylindrical 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

Physical modeling of the magnet - report

These information are the direct effect of a engineering analysis. Results are based on models for the material Nd₂Fe₁₄B. Operational performance might slightly deviate from the simulation results. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs gap) - power drop
MW 40x8 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	2302 Gs 230.2 mT	20.43 kg / 45.04 lbs 20430.0 g / 200.4 N	crushing
1 mm	2235 Gs 223.5 mT	19.25 kg / 42.44 lbs 19252.0 g / 188.9 N	crushing
2 mm	2156 Gs 215.6 mT	17.92 kg / 39.50 lbs 17917.4 g / 175.8 N	crushing
3 mm	2068 Gs 206.8 mT	16.49 kg / 36.36 lbs 16490.6 g / 161.8 N	crushing
5 mm	1875 Gs 187.5 mT	13.56 kg / 29.89 lbs 13556.7 g / 133.0 N	crushing
10 mm	1375 Gs 137.5 mT	7.29 kg / 16.07 lbs 7287.4 g / 71.5 N	medium risk
15 mm	959 Gs 95.9 mT	3.54 kg / 7.81 lbs 3542.3 g / 34.8 N	medium risk
20 mm	661 Gs 66.1 mT	1.68 kg / 3.71 lbs 1684.9 g / 16.5 N	low risk
30 mm	328 Gs 32.8 mT	0.41 kg / 0.91 lbs 414.2 g / 4.1 N	low risk
50 mm	105 Gs 10.5 mT	0.04 kg / 0.09 lbs 42.3 g / 0.4 N	low risk

Grip strength decreases sharply per each millimeter of spacing. Keep in mind that even a very thin break (e.g., contamination, paint, dust) strongly weakens the grip. Magnets operate strongest during direct contact; gap drastically cuts the power. See how rapidly the load capacity fall, when the product does not adhere flatly to the steel surface. When planning the assembly, discard redundant distances.

Table 2: Sliding force (vertical surface)
MW 40x8 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	4.09 kg / 9.01 lbs 4086.0 g / 40.1 N
1 mm	Stal (~0.2)	3.85 kg / 8.49 lbs 3850.0 g / 37.8 N
2 mm	Stal (~0.2)	3.58 kg / 7.90 lbs 3584.0 g / 35.2 N
3 mm	Stal (~0.2)	3.30 kg / 7.27 lbs 3298.0 g / 32.4 N
5 mm	Stal (~0.2)	2.71 kg / 5.98 lbs 2712.0 g / 26.6 N
10 mm	Stal (~0.2)	1.46 kg / 3.21 lbs 1458.0 g / 14.3 N
15 mm	Stal (~0.2)	0.71 kg / 1.56 lbs 708.0 g / 6.9 N
20 mm	Stal (~0.2)	0.34 kg / 0.74 lbs 336.0 g / 3.3 N
30 mm	Stal (~0.2)	0.08 kg / 0.18 lbs 82.0 g / 0.8 N
50 mm	Stal (~0.2)	0.01 kg / 0.02 lbs 8.0 g / 0.1 N

The following data presents the estimated weight limit necessary to initiate the sliding of the magnet downwards along a upright metal surface (assuming standard friction). This value depends on the air gap between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MW 40x8 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	6.13 kg / 13.51 lbs 6129.0 g / 60.1 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	4.09 kg / 9.01 lbs 4086.0 g / 40.1 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	2.04 kg / 4.50 lbs 2043.0 g / 20.0 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	10.22 kg / 22.52 lbs 10215.0 g / 100.2 N

When hanging a holder on a vertical wall (e.g., a car body), it you can count on only approx. 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient cause that products slide down easier than they pull off. Designing a hanger? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a painted metal, the element will give way down under a significantly smaller cargo. Using a rubber coating can effectively increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MW 40x8 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	5%	1.02 kg / 2.25 lbs 1021.5 g / 10.0 N
1 mm	13%	2.55 kg / 5.63 lbs 2553.8 g / 25.1 N
2 mm	25%	5.11 kg / 11.26 lbs 5107.5 g / 50.1 N
3 mm	38%	7.66 kg / 16.89 lbs 7661.3 g / 75.2 N
5 mm	63%	12.77 kg / 28.15 lbs 12768.8 g / 125.3 N
10 mm	100%	20.43 kg / 45.04 lbs 20430.0 g / 200.4 N
11 mm	100%	20.43 kg / 45.04 lbs 20430.0 g / 200.4 N
12 mm	100%	20.43 kg / 45.04 lbs 20430.0 g / 200.4 N

A thin metal plate is unable to take in the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a too thin substrate, the flux will penetrate right through and the holding will be smaller. To achieve the maximum of this magnet's potential, you require a sufficiently solid piece of steel. The material oversaturation means that on sheet metal structures (e.g., car bodies), the holder shows lower pull force. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal resistance (material behavior) - power drop
MW 40x8 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	20.43 kg / 45.04 lbs 20430.0 g / 200.4 N	OK
40 °C	-2.2%	19.98 kg / 44.05 lbs 19980.5 g / 196.0 N	OK
60 °C	-4.4%	19.53 kg / 43.06 lbs 19531.1 g / 191.6 N
80 °C	-6.6%	19.08 kg / 42.07 lbs 19081.6 g / 187.2 N
100 °C	-28.8%	14.55 kg / 32.07 lbs 14546.2 g / 142.7 N

Standard neodymium magnets lose strength after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly damage this magnet. With increasing heat, the neodymium's power momentarily drops. Avoid using this product in hot environments exceeding its working range. Too high temperature will result in destruction of magnetic properties.

*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) are more susceptible to demagnetization under lower heat stress than taller cylinders. Red status in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MW 40x8 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Lateral Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	41.05 kg / 90.51 lbs 3 871 Gs	6.16 kg / 13.58 lbs 6158 g / 60.4 N	N/A
1 mm	39.92 kg / 88.02 lbs 4 540 Gs	5.99 kg / 13.20 lbs 5989 g / 58.7 N	35.93 kg / 79.22 lbs ~0 Gs
2 mm	38.69 kg / 85.29 lbs 4 469 Gs	5.80 kg / 12.79 lbs 5803 g / 56.9 N	34.82 kg / 76.76 lbs ~0 Gs
3 mm	37.38 kg / 82.40 lbs 4 393 Gs	5.61 kg / 12.36 lbs 5606 g / 55.0 N	33.64 kg / 74.16 lbs ~0 Gs
5 mm	34.59 kg / 76.25 lbs 4 226 Gs	5.19 kg / 11.44 lbs 5188 g / 50.9 N	31.13 kg / 68.63 lbs ~0 Gs
10 mm	27.24 kg / 60.06 lbs 3 750 Gs	4.09 kg / 9.01 lbs 4086 g / 40.1 N	24.52 kg / 54.05 lbs ~0 Gs
20 mm	14.64 kg / 32.28 lbs 2 750 Gs	2.20 kg / 4.84 lbs 2197 g / 21.5 N	13.18 kg / 29.06 lbs ~0 Gs
50 mm	1.65 kg / 3.63 lbs 922 Gs	0.25 kg / 0.54 lbs 247 g / 2.4 N	1.48 kg / 3.26 lbs ~0 Gs
60 mm	0.83 kg / 1.84 lbs 656 Gs	0.12 kg / 0.28 lbs 125 g / 1.2 N	0.75 kg / 1.65 lbs ~0 Gs
70 mm	0.44 kg / 0.97 lbs 477 Gs	0.07 kg / 0.15 lbs 66 g / 0.6 N	0.40 kg / 0.87 lbs ~0 Gs
80 mm	0.24 kg / 0.54 lbs 355 Gs	0.04 kg / 0.08 lbs 37 g / 0.4 N	0.22 kg / 0.49 lbs ~0 Gs
90 mm	0.14 kg / 0.31 lbs 270 Gs	0.02 kg / 0.05 lbs 21 g / 0.2 N	0.13 kg / 0.28 lbs ~0 Gs
100 mm	0.09 kg / 0.19 lbs 210 Gs	0.01 kg / 0.03 lbs 13 g / 0.1 N	0.08 kg / 0.17 lbs ~0 Gs

Two strong neodymiums interact from a wider radius than a magnet and sheet combination. The connection of two magnets generates a stronger field and a larger range of performance. Designing a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the impact force is massive. The repulsion force is marginally weaker than the connection force, but still significant.
*The magnetic induction in repulsion mode reaches ~0 Gs in the exact middle between the magnets (due to field cancellation).
* Estimates demonstrate shear force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - warnings
MW 40x8 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	15.5 cm
Hearing aid	10 Gs (1.0 mT)	12.5 cm
Mechanical watch	20 Gs (2.0 mT)	9.5 cm
Mobile device	40 Gs (4.0 mT)	7.5 cm
Car key	50 Gs (5.0 mT)	7.0 cm
Payment card	400 Gs (40.0 mT)	3.0 cm
HDD hard drive	600 Gs (60.0 mT)	2.5 cm

A strong magnetic field is a large risk to electronics and pacemakers. These NdFeB products produce a field that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and housings. Special caution must be taken by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, car keys, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
MW 40x8 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	19.96 km/h (5.54 m/s)	1.16 J
30 mm	29.12 km/h (8.09 m/s)	2.47 J
50 mm	37.17 km/h (10.32 m/s)	4.02 J
100 mm	52.50 km/h (14.58 m/s)	8.02 J

NdFeB products are very brittle – a collision with steel can result in shattering. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can trigger coating fragments or painful pinches to fingers. 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 neodymium. Wear eye protection when playing with large magnets.

Table 9: Coating parameters (durability)
MW 40x8 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (P_c)
MW 40x8 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	33 553 Mx	335.5 µWb
P_c Coefficient	0.29	Low (Flat)

Total magnetic flux emitted by the magnet pole. Key data when building generators as well as sensors. The P_c coefficient defines the magnet's operating point.

Table 11: Physics of underwater searching
MW 40x8 / N38

Environment	Effective steel pull	Effect
Air (land)	20.43 kg	Standard
Water (riverbed)	23.39 kg (+2.96 kg buoyancy gain)	+14.5%

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

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. Sliding resistance

*Caution: On a vertical wall, the magnet retains merely ~20% of its max power.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Heat tolerance

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.29

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

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%

Sustainability

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: 010069-2026

Magnet Unit Converter

Magnet pull force

Force in kg

Force (N)

Pounds (lbs)

Magnetic Field

Induction (Gs)

Put a figure in a single field to generate results for the other fields at once.

See more offers

Product available Ships tomorrow

MP 14x8/4x3 / N38 - ring magnet

2.47 ZŁ brutto / pcs

Product available Ships tomorrow

UMC 16x5/2x5 / N38 - cylindrical magnetic holder

3.33 ZŁ brutto / pcs

Product available Ships tomorrow

CM PML-10 / N45 - magnetic gripper

2019.05 ZŁ brutto / pcs

Product available Ships tomorrow

UMH 48x11x65 [M6] / N38 - magnetic holder with hook

68.88 ZŁ brutto / pcs

The offered product is an incredibly powerful cylindrical magnet, made from modern NdFeB material, which, at dimensions of Ø40x8 mm, guarantees optimal power. The MW 40x8 / N38 model boasts high dimensional repeatability and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 20.43 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 200.39 N with a weight of only 75.4 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.

Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 40.1 mm) using two-component epoxy glues. To ensure stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.

Magnets N38 are strong enough for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø40x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.

This model is characterized by dimensions Ø40x8 mm, which, at a weight of 75.4 g, makes it an element with impressive magnetic energy density. The value of 200.39 N means that the magnet is capable of holding a weight many times exceeding its own mass of 75.4 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.

This cylinder is magnetized axially (along the height of 8 mm), which means that the N and S poles are located on the flat, circular surfaces. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Pros as well as cons of neodymium magnets.

Strengths

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

They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
They possess excellent resistance to magnetic field loss due to external fields,
Thanks to the shimmering finish, the plating of Ni-Cu-Ni, gold-plated, or silver-plated gives an visually attractive appearance,
Magnets are distinguished by excellent magnetic induction on the working surface,
Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
Thanks to modularity in designing and the capacity to modify to complex applications,
Wide application in high-tech industry – they are utilized in mass storage devices, drive modules, medical devices, also multitasking production systems.
Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:

Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
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 - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Limited ability of making threads in the magnet and complex forms - recommended is cover - magnetic holder.
Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
With large orders the cost of neodymium magnets is economically unviable,

Pull force analysis

Maximum lifting force for a neodymium magnet – what it depends on?

The load parameter shown represents the maximum value, recorded under ideal test conditions, namely:

using a sheet made of low-carbon steel, acting as a circuit closing element
with a cross-section minimum 10 mm
with a surface cleaned and smooth
with total lack of distance (without coatings)
during detachment in a direction vertical to the plane
at room temperature

Practical lifting capacity: influencing factors

Effective lifting capacity is affected by working environment parameters, including (from most important):

Distance (between the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, rust or debris).
Direction of force – maximum parameter is available only during pulling at a 90° angle. The shear force of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
Plate material – low-carbon steel gives the best results. Higher carbon content lower magnetic permeability and lifting capacity.
Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets

Bone fractures

Big blocks can break fingers in a fraction of a second. Do not place your hand betwixt two attracting surfaces.

Operating temperature

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

Material brittleness

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

Respect the power

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

No play value

NdFeB magnets are not toys. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which poses a severe health hazard and necessitates immediate surgery.

Cards and drives

Data protection: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, medical aids, timepieces).

Keep away from electronics

Note: neodymium magnets generate a field that disrupts precision electronics. Keep a separation from your phone, device, and GPS.

Fire risk

Dust produced during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Nickel allergy

A percentage of the population experience a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact might lead to skin redness. We suggest use protective gloves.

Danger to pacemakers

Life threat: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Caution! Want to know more? Check our post: Why are neodymium magnets dangerous?

MW 40x8 / N38 - cylindrical magnet

Product card - MW 40x8 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical modeling of the magnet - report

Table 1: Static pull force (pull vs gap) - power drop MW 40x8 / N38

Table 2: Sliding force (vertical surface) MW 40x8 / N38

Table 3: Vertical assembly (sliding) - vertical pull MW 40x8 / N38

Table 4: Material efficiency (substrate influence) - power losses MW 40x8 / N38

Table 5: Thermal resistance (material behavior) - power drop MW 40x8 / N38

Table 6: Two magnets (attraction) - field range MW 40x8 / N38

Table 7: Hazards (implants) - warnings MW 40x8 / N38

Table 8: Impact energy (kinetic energy) - warning MW 40x8 / N38

Table 9: Coating parameters (durability) MW 40x8 / N38

Table 10: Electrical data (Pc) MW 40x8 / N38

Table 11: Physics of underwater searching MW 40x8 / N38

1. Sliding resistance

2. Plate thickness effect

3. Heat tolerance

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

Material specification

Sustainability

Magnet pull force

Magnetic Field

See more offers

MP 14x8/4x3 / N38 - ring magnet

UMC 16x5/2x5 / N38 - cylindrical magnetic holder

CM PML-10 / N45 - magnetic gripper

UMH 48x11x65 [M6] / N38 - magnetic holder with hook

Pros as well as cons of neodymium magnets.

Strengths

Weaknesses

Pull force analysis

Maximum lifting force for a neodymium magnet – what it depends on?

Practical lifting capacity: influencing factors

Precautions when working with NdFeB magnets

Bone fractures

Operating temperature

Material brittleness

Respect the power

No play value

Cards and drives

Keep away from electronics

Fire risk

Nickel allergy

Danger to pacemakers

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs gap) - power drop
MW 40x8 / N38

Table 2: Sliding force (vertical surface)
MW 40x8 / N38

Table 3: Vertical assembly (sliding) - vertical pull
MW 40x8 / N38

Table 4: Material efficiency (substrate influence) - power losses
MW 40x8 / N38

Table 5: Thermal resistance (material behavior) - power drop
MW 40x8 / N38

Table 6: Two magnets (attraction) - field range
MW 40x8 / N38

Table 7: Hazards (implants) - warnings
MW 40x8 / N38

Table 8: Impact energy (kinetic energy) - warning
MW 40x8 / N38

Table 9: Coating parameters (durability)
MW 40x8 / N38

Table 10: Electrical data (P_c)
MW 40x8 / N38

Table 11: Physics of underwater searching
MW 40x8 / N38