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MW 45x30 / 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 010073

GTIN: 5906301810728

Diameter Ø

45 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

357.85 g

Magnetization Direction

↑ axial

Load capacity

95.26 kg / 934.48 N

Magnetic Induction

495.87 mT

Coating

[NiCuNi] Nickel

136.80 ZŁ with VAT / pcs + price for transport

111.22 ZŁ net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety

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Give us a call +48 22 499 98 98 otherwise get in touch by means of request form our website.
Force as well as shape of a neodymium magnet can be verified using our modular calculator.

Orders placed before 14:00 will be shipped the same business day.

MW 45x30 / N38 - cylindrical magnet

Specification / characteristics MW 45x30 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010073
GTIN	5906301810728
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	30 mm [±0,1 mm]
Weight	357.85 g
Magnetization Direction	↑ axial
Load capacity ~ ?	95.26 kg / 934.48 N
Magnetic Induction ~ ?	495.87 mT
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 45x30 / 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

Physical modeling of the assembly - technical parameters

These information are the direct effect of a engineering simulation. Results are based on models for the material NdFeB. Operational performance may deviate from the simulation results. Please consider these data as a reference point when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MW 45x30 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	4958 Gs 495.8 mT	95.26 kg / 95260.0 g 934.5 N	critical level
1 mm	4742 Gs 474.2 mT	87.16 kg / 87160.1 g 855.0 N	critical level
2 mm	4523 Gs 452.3 mT	79.28 kg / 79277.0 g 777.7 N	critical level
5 mm	3870 Gs 387.0 mT	58.05 kg / 58052.8 g 569.5 N	critical level
10 mm	2886 Gs 288.6 mT	32.27 kg / 32272.4 g 316.6 N	critical level
15 mm	2106 Gs 210.6 mT	17.19 kg / 17193.7 g 168.7 N	critical level
20 mm	1535 Gs 153.5 mT	9.13 kg / 9129.8 g 89.6 N	strong
30 mm	845 Gs 84.5 mT	2.77 kg / 2768.8 g 27.2 N	strong
50 mm	315 Gs 31.5 mT	0.38 kg / 383.4 g 3.8 N	safe

Magnetic force weakens drastically with every mm of distance. Note that even a very thin break (e.g., dirt, varnish, veneer) strongly diminishes the holding power. Magnets work strongest in perfect adhesion; air break nullifies the force. Analyze how flashily the parameters fall, when the magnet does not touch tightly to the metal substrate. When planning the arrangement, discard unnecessary gaps.

Table 2: Vertical assembly (sliding) - behavior on slippery surfaces
MW 45x30 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	28.58 kg / 28578.0 g 280.4 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	19.05 kg / 19052.0 g 186.9 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	9.53 kg / 9526.0 g 93.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	47.63 kg / 47630.0 g 467.3 N

When placing a holder on a upright surface (e.g., a fridge), it you can count on only approx. 1/5 of its nominal power. Gravity as well as a weak degree of grip cause that holders slide down faster than they pop off the substrate. Want to create a wall mount? Note that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will slip down under a significantly smaller cargo. Using a rubber pad can effectively increase the grip.

Table 3: Material efficiency (saturation) - power losses
MW 45x30 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	3%	3.18 kg / 3175.3 g 31.2 N
1 mm	8%	7.94 kg / 7938.3 g 77.9 N
2 mm	17%	15.88 kg / 15876.7 g 155.8 N
5 mm	42%	39.69 kg / 39691.7 g 389.4 N
10 mm	83%	79.38 kg / 79383.3 g 778.8 N

A thin sheet is incapable of take in the full magnetic flux, which weakens actual performance of the holder. Should you mount a strong magnet to a thin surface, the flux will pass right through and the attraction force will be weaker. To squeeze 100% of this neodymium's potential, you need a suitably thick element of steel. The saturation effect means that on thin elements (e.g., appliance housings), the holder holds weaker. We recommend selecting the steel thickness based on the following data.

Table 4: Thermal stability (stability) - thermal limit
MW 45x30 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	95.26 kg / 95260.0 g 934.5 N	OK
40 °C	-2.2%	93.16 kg / 93164.3 g 913.9 N	OK
60 °C	-4.4%	91.07 kg / 91068.6 g 893.4 N	OK
80 °C	-6.6%	88.97 kg / 88972.8 g 872.8 N
100 °C	-28.8%	67.83 kg / 67825.1 g 665.4 N

Ordinary NdFeB products lose parameters after exceeding the maximum temperature. Watch out for overheating – high temperature can permanently damage this magnet. With increasing heat, the neodymium's force momentarily drops. Refrain from using this product close to heaters higher than its working range. Too high temperature will result in permanent loss of magnetic properties.

Table 5: Magnet-Magnet interaction (attraction) - field collision
MW 45x30 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	142.89 kg / 142890.0 g 1401.8 N	N/A
2 mm	118.92 kg / 118920.0 g 1166.6 N	110.99 kg / 110992.0 g 1088.8 N
5 mm	87.07 kg / 87075.0 g 854.2 N	81.27 kg / 81270.0 g 797.3 N
10 mm	48.41 kg / 48405.0 g 474.9 N	45.18 kg / 45178.0 g 443.2 N
20 mm	13.70 kg / 13695.0 g 134.3 N	12.78 kg / 12782.0 g 125.4 N
50 mm	0.57 kg / 570.0 g 5.6 N	0.53 kg / 532.0 g 5.2 N

Two magnetic products interact from a wider radius than a magnet and steel setup. The connection of two magnets produces a massive flux and a larger range of performance. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the impact force is extreme. The levitation is a bit weaker than the attraction, but still impressive.

Table 6: Protective zones (electronics) - warnings
MW 45x30 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	25.5 cm
Hearing aid	10 Gs (1.0 mT)	20.0 cm
Mechanical watch	20 Gs (2.0 mT)	15.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	12.0 cm
Remote	50 Gs (5.0 mT)	11.0 cm
Payment card	400 Gs (40.0 mT)	4.5 cm
HDD hard drive	600 Gs (60.0 mT)	4.0 cm

Powerful magnet radiation poses a large risk to electronics and pacemakers. These magnets produce a field that disrupts operation of digital equipment. Notice: the invisible magnetic field acts through matter and glass. Special caution must be taken by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, remotes, membranes, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 7: Impact energy (kinetic energy) - warning
MW 45x30 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	19.63 km/h (5.45 m/s)	5.32 J
30 mm	29.01 km/h (8.06 m/s)	11.62 J
50 mm	36.89 km/h (10.25 m/s)	18.78 J
100 mm	52.04 km/h (14.46 m/s)	37.39 J

Neodymium magnets are delicate – a collision with steel can result in shattering. Control the attraction moment – a neodymium left loose turns into a projectile. Kinetic force can cause material chips or injury to skin. 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 magnet. Wear safety glasses when handling with powerful specimens.

Table 8: Coating parameters (durability)
MW 45x30 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 9: Hydrostatics and buoyancy
MW 45x30 / N38

Environment	Effective steel pull	Effect
Air (land)	95.26 kg	Standard
Water (riverbed)	109.07 kg (+13.81 kg Buoyancy gain)	+14.5%

Rust risk: 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. Buoyancy helps in lifting finds.

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MW 40x15 / N38 - cylindrical magnet

65.93 ZŁ brutto / pcs

The offered product is an extremely powerful cylinder magnet, composed of durable NdFeB material, which, at dimensions of Ø45x30 mm, guarantees maximum efficiency. This specific item features high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 95.26 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.

It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 934.48 N with a weight of only 357.85 g, this rod is indispensable in electronics 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 stability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.

Magnets N38 are suitable for the majority of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø45x30), 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 Ø45x30 mm, which, at a weight of 357.85 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 95.26 kg (force ~934.48 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, 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 and cons of rare earth magnets.

Besides their stability, neodymium magnets are valued for these benefits:

They do not lose strength, even over nearly 10 years – the decrease in lifting capacity is only ~1% (theoretically),
They retain their magnetic properties even under close interference source,
In other words, due to the glossy surface of nickel, the element gains a professional look,
The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
Considering the option of accurate forming and customization to unique projects, NdFeB magnets can be manufactured in a wide range of geometric configurations, which expands the range of possible applications,
Versatile presence in modern technologies – they are commonly used in computer drives, brushless drives, precision medical tools, as well as complex engineering applications.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons of neodymium magnets: tips and applications.

They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as 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
Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise 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 recommend using cover - magnetic mechanism.
Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these magnets can complicate diagnosis medical in case of swallowing.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Detachment force of the magnet in optimal conditions – what contributes to it?

The load parameter shown represents the peak performance, obtained under laboratory conditions, meaning:

using a base made of low-carbon steel, serving as a magnetic yoke
whose transverse dimension is min. 10 mm
with a surface cleaned and smooth
without the slightest insulating layer between the magnet and steel
under vertical force direction (90-degree angle)
at conditions approx. 20°C

Magnet lifting force in use – key factors

In real-world applications, the actual lifting capacity results from many variables, listed from the most important:

Gap (between the magnet and the metal), as even a very small clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
Steel type – low-carbon steel attracts best. Alloy steels lower magnetic properties and lifting capacity.
Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

* Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate decreases the holding force.

Safety rules for work with NdFeB magnets

Powerful field

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

Warning for allergy sufferers

Studies show that nickel (standard magnet coating) is a potent allergen. If your skin reacts to metals, avoid direct skin contact or opt for coated magnets.

Implant safety

Individuals with a ICD must keep an large gap from magnets. The magnetic field can stop the functioning of the implant.

Electronic devices

Equipment safety: Neodymium magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

Dust explosion hazard

Powder created during machining of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Keep away from electronics

An intense magnetic field disrupts the functioning of magnetometers in phones and GPS navigation. Maintain magnets close to a smartphone to prevent breaking the sensors.

Pinching danger

Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Be careful!

Maximum temperature

Avoid heat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Danger to the youngest

Only for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep away from kids and pets.

Protective goggles

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

Danger!

Looking for details? Read our article: Why are neodymium magnets dangerous?

MW 45x30 / N38 - cylindrical magnet

MW 45x30 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical modeling of the assembly - technical parameters

Other deals

MW 18.9x10 / N38 - cylindrical magnet

MP 24x16x2 / N38 - ring magnet

BM 550x180x70 [4x M8] - magnetic beam

MW 40x15 / N38 - cylindrical magnet

Pros and cons of rare earth magnets.

Detachment force of the magnet in optimal conditions – what contributes to it?

Magnet lifting force in use – key factors

Safety rules for work with NdFeB magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C