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MW 45x35 / 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: 1-6500
Rating: 5

cylindrical magnet

Catalog no 010074

GTIN: 5906301810735

Diameter Ø

45 mm [±0,1 mm]

Height

35 mm [±0,1 mm]

Weight

417.49 g

Magnetization Direction

↑ axial

Load capacity

90.84 kg / 891.17 N

Magnetic Induction

521.39 mT

Coating

[NiCuNi] Nickel

180.10 ZŁ with VAT / pcs + price for transport

146.42 ZŁ net + 23% VAT / pcs

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MW 45x35 / N38 - cylindrical magnet

Specification / characteristics MW 45x35 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010074
GTIN	5906301810735
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	45 mm [±0,1 mm]
Height	35 mm [±0,1 mm]
Weight	417.49 g
Magnetization Direction	↑ axial
Load capacity ~ ?	90.84 kg / 891.17 N
Magnetic Induction ~ ?	521.39 mT
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 45x35 / N38 - cylindrical 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 - report

These data are the result of a engineering simulation. Values are based on models for the NdFeB material. Real-world conditions may differ. Please consider these calculations as a reference point for designers.

Table 1: Static force (force vs gap) - characteristics
MW 45x35 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5213 Gs 521.3 mT	90.84 kg / 90840.0 g 891.1 N	dangerous!
1 mm	4982 Gs 498.2 mT	82.98 kg / 82978.3 g 814.0 N	dangerous!
2 mm	4748 Gs 474.8 mT	75.37 kg / 75372.1 g 739.4 N	dangerous!
5 mm	4059 Gs 405.9 mT	55.07 kg / 55068.0 g 540.2 N	dangerous!
10 mm	3027 Gs 302.7 mT	30.64 kg / 30636.6 g 300.5 N	dangerous!
15 mm	2215 Gs 221.5 mT	16.40 kg / 16396.9 g 160.9 N	dangerous!
20 mm	1619 Gs 161.9 mT	8.77 kg / 8765.5 g 86.0 N	strong
30 mm	899 Gs 89.9 mT	2.70 kg / 2701.1 g 26.5 N	strong
50 mm	340 Gs 34.0 mT	0.39 kg / 385.6 g 3.8 N	low risk

Pulling power weakens drastically with every mm of distance. Remember that even the smallest break (e.g., contamination, paint, rust) significantly diminishes the pull force. Neodymiums hold optimally during direct contact; air gap drastically cuts the force. Observe how rapidly the load capacity drops when the magnet does not touch flatly to the metal. When planning the mounting, eliminate redundant distances.

Table 2: Wall mounting (sliding) - behavior on slippery surfaces
MW 45x35 / N38

Surface Type	Friction Coefficient / % Mocy	Max Load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	27.25 kg / 27252.0 g 267.3 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	18.17 kg / 18168.0 g 178.2 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	9.08 kg / 9084.0 g 89.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	45.42 kg / 45420.0 g 445.6 N

When mounting a magnet on a vertical wall (e.g., a fridge), it will maintain just approx. 1/5 of its maximum pull. Gravity as well as a low degree of grip mean that products slip faster than they detach. Planning a wall mount? Note that the shear force is significantly weaker than the perpendicular pull force. On a slippery surface, the element will slide down under a much smaller weight. The application of an rubber pad can drastically improve the result.

Table 3: Material efficiency (substrate influence) - sheet metal selection
MW 45x35 / N38

Steel Thickness (mm)	% Power	Real Pull (kg)
0.5 mm	3%	3.03 kg / 3028.0 g 29.7 N
1 mm	8%	7.57 kg / 7570.0 g 74.3 N
2 mm	17%	15.14 kg / 15140.0 g 148.5 N
5 mm	42%	37.85 kg / 37850.0 g 371.3 N
10 mm	83%	75.70 kg / 75700.0 g 742.6 N

A thin surface cannot absorb the entire magnetic field, which squanders the magnet's power. Should you mount a powerful product to weak surfaces, the field will pass right through and the holding will be weaker. To utilize 100% of this neodymium's potential, you require a sufficiently solid element of steel. The magnetic saturation effect causes that on delicate elements (e.g., car bodies), the holder holds weaker. We recommend choosing the steel cross-section based on the following data.

Table 4: Working in heat (stability) - power drop
MW 45x35 / N38

Ambient Temp. (°C)	Power Loss	Remaining Pull	Status
20 °C	0.0%	90.84 kg / 90840.0 g 891.1 N	OK
40 °C	-2.2%	88.84 kg / 88841.5 g 871.5 N	OK
60 °C	-4.4%	86.84 kg / 86843.0 g 851.9 N	OK
80 °C	-6.6%	84.84 kg / 84844.6 g 832.3 N
100 °C	-28.8%	64.68 kg / 64678.1 g 634.5 N

Standard neodymium magnets irreversibly lose their magnetic properties past the thermal threshold. Watch out for overheating – high temperature can irreversibly damage this magnet. With increasing heat, the neodymium's power briefly decreases. Do not use this magnet near ovens higher than its operating temperature limit. Ignoring the critical threshold will cause irreversible loss of magnetic properties.

Table 5: Two magnets (attraction) - forces in the system
MW 45x35 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	136.26 kg / 136260.0 g 1336.7 N	N/A
2 mm	113.06 kg / 113055.0 g 1109.1 N	105.52 kg / 105518.0 g 1035.1 N
5 mm	82.61 kg / 82605.0 g 810.4 N	77.10 kg / 77098.0 g 756.3 N
10 mm	45.96 kg / 45960.0 g 450.9 N	42.90 kg / 42896.0 g 420.8 N
20 mm	13.16 kg / 13155.0 g 129.1 N	12.28 kg / 12278.0 g 120.4 N
50 mm	0.59 kg / 585.0 g 5.7 N	0.55 kg / 546.0 g 5.4 N

Two strong magnets attract each other from a much further distance than a neodymium and metal combination. A two-magnet connection creates a more powerful interaction and a wider range of operation. Planning to create a solid closure? Use a pair of magnets instead of one magnet and a steel piece. Be careful that when connecting a pair of magnets, the impact force is massive. The levitation is a bit lower than the attraction, but still substantial.

Table 6: Safety (HSE) (electronics) - warnings
MW 45x35 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	26.5 cm
Hearing aid / Implant	10 Gs (1.0 mT)	20.5 cm
Mechanical watch	20 Gs (2.0 mT)	16.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	12.5 cm
Car key	50 Gs (5.0 mT)	11.5 cm
Payment card	400 Gs (40.0 mT)	5.0 cm
HDD hard drive	600 Gs (60.0 mT)	4.0 cm

A powerful magnetic field is a major danger to electronics and medical implants. These magnets produce a field that disrupts the function of delicate digital equipment. Be aware: the invisible magnetic field penetrates bodies and plastic. Special caution must be taken by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, car keys, speakers, and screens. Do not place the product away from cards, HDD media, or precise measuring instruments.

Table 7: Dynamics (cracking risk) - warning
MW 45x35 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	17.74 km/h (4.93 m/s)	5.07 J
30 mm	26.24 km/h (7.29 m/s)	11.09 J
50 mm	33.35 km/h (9.26 m/s)	17.92 J
100 mm	47.05 km/h (13.07 m/s)	35.65 J

NdFeB products are very brittle – a uncontrolled collision with steel risks their cracking. Pay attention to the connection speed – a magnet left loose turns into a projectile. Impact energy can cause coating fragments or painful crushing of skin. Always control the product during installation so it doesn't hit the steel with momentum. A collision at a velocity of many km/h almost guarantees the shattering of the neodymium. Wear safety glasses when playing with powerful magnets.

Table 8: Corrosion resistance
MW 45x35 / 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 9: Underwater work (magnet fishing)
MW 45x35 / N38

Environment	Effective Steel Pull	Effect
Air (Land)	90.84 kg	Standard
Water (Riverbed)	104.01 kg (+13.17 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!

Interestingly, in water, the magnet feels 'stronger' due to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

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UMC 25x6/4x8 / N38 - cylindrical magnetic holder

11.70 ZŁ brutto / pcs

The presented product is a very strong cylinder magnet, produced from modern NdFeB material, which, with dimensions of Ø45x35 mm, guarantees the highest energy density. This specific item features high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 90.84 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.

This model is ideal for building electric motors, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 891.17 N with a weight of only 417.49 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.

Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure long-term durability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.

Magnets NdFeB grade N38 are suitable for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø45x35), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.

This model is characterized by dimensions Ø45x35 mm, which, at a weight of 417.49 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 90.84 kg (force ~891.17 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.

Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 45 mm. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Pros as well as cons of rare earth magnets.

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

They retain full power for around ten years – the drop is just ~1% (in theory),
They are noted for resistance to demagnetization induced by external disturbances,
In other words, due to the aesthetic surface of nickel, the element is aesthetically pleasing,
Magnetic induction on the top side of the magnet turns out to be very high,
Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
Possibility of custom creating as well as modifying to defined needs,
Wide application in electronics industry – they serve a role in computer drives, motor assemblies, precision medical tools, and modern systems.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in small systems

Disadvantages of neodymium magnets:

At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
Due to limitations in producing nuts and complex forms in magnets, we propose using cover - magnetic holder.
Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these devices can be problematic in diagnostics medical after entering the body.
With large orders the cost of neodymium magnets is a challenge,

Maximum holding power of the magnet – what affects it?

Information about lifting capacity was defined for the most favorable conditions, including:

with the contact of a sheet made of special test steel, ensuring full magnetic saturation
possessing a thickness of at least 10 mm to avoid saturation
characterized by even structure
under conditions of ideal adhesion (metal-to-metal)
during pulling in a direction vertical to the mounting surface
at temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

During everyday use, the actual lifting capacity results from several key aspects, presented from crucial:

Distance – the presence of any layer (paint, dirt, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
Base massiveness – too thin steel causes magnetic saturation, causing part of the power to be lost to the other side.
Metal type – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.

* Lifting capacity was assessed using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the holding force is lower. Additionally, even a minimal clearance {between} the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets

Demagnetization risk

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Threat to navigation

Remember: rare earth magnets produce a field that interferes with sensitive sensors. Maintain a safe distance from your phone, tablet, and navigation systems.

Crushing risk

Pinching hazard: The attraction force is so great that it can cause blood blisters, crushing, and broken bones. Use thick gloves.

Threat to electronics

Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Allergy Warning

Some people have a contact allergy to Ni, which is the common plating for neodymium magnets. Prolonged contact might lead to a rash. It is best to use protective gloves.

Fragile material

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

Do not give to children

Strictly keep magnets away from children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are life-threatening.

Fire risk

Powder created during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Handling rules

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

ICD Warning

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

Warning!

Need more info? Check our post: Are neodymium magnets dangerous?

MW 45x35 / N38 - cylindrical magnet

MW 45x35 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical simulation of the product - report

Other products

MW 12.5x2 / N38 - cylindrical magnet

MPL 3x3x1 / N38 - lamellar magnet

AM ucho [M12] - magnetic accessories

UMC 25x6/4x8 / N38 - cylindrical magnetic holder

Pros as well as cons of rare earth magnets.

Maximum holding power of the magnet – what affects it?

Magnet lifting force in use – key factors

Safety rules for work with neodymium magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C