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MW 45x30 / N38 - cylindrical magnet

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

69.46 kg / 681.39 N

Magnetic Induction

0.50 mT / 5 Gs

Coating

[NiCuNi] Nickel

136.80 ZŁ with VAT / pcs + price for transport

111.22 ZŁ net + 23% VAT / pcs

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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 ~ ?	69.46 kg / 681.39 N
Magnetic Induction ~ ?	0.50 mT / 5 Gs
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

Engineering analysis of the magnet - technical parameters

These data constitute the result of a physical simulation. Values were calculated on algorithms for the material NdFeB. Real-world performance may differ from theoretical values. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs gap) - power drop
MW 45x30 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	4958 Gs 495.8 mT	69.46 kg / 69460.0 g 681.4 N	critical level
1 mm	4742 Gs 474.2 mT	63.55 kg / 63553.9 g 623.5 N	critical level
2 mm	4523 Gs 452.3 mT	57.81 kg / 57805.8 g 567.1 N	critical level
5 mm	3870 Gs 387.0 mT	42.33 kg / 42329.9 g 415.3 N	critical level
10 mm	2886 Gs 288.6 mT	23.53 kg / 23531.8 g 230.8 N	critical level
15 mm	2106 Gs 210.6 mT	12.54 kg / 12537.0 g 123.0 N	critical level
20 mm	1535 Gs 153.5 mT	6.66 kg / 6657.1 g 65.3 N	strong
30 mm	845 Gs 84.5 mT	2.02 kg / 2018.9 g 19.8 N	strong
50 mm	315 Gs 31.5 mT	0.28 kg / 279.5 g 2.7 N	safe

Pulling power decreases significantly with every subsequent millimeter of distance. Keep in mind that even the smallest gap (e.g., dirt, varnish, dust) strongly reduces the pull force. Magnetic products work most effectively at the point of direct contact; distance weakens the force. Analyze how quickly the pull force fall, when the magnet does not touch flatly to the steel surface. When designing the assembly, avoid redundant distances.

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

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	20.84 kg / 20838.0 g 204.4 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	13.89 kg / 13892.0 g 136.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	6.95 kg / 6946.0 g 68.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	34.73 kg / 34730.0 g 340.7 N

When mounting a holder on a vertical wall (e.g., a board), it will only hold just approx. 1/5 of its nominal power. Gravitational force and a low friction coefficient cause that holders slip faster than they pull off. Want to create a wall mount? Remember that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will slide down under a significantly smaller weight. Application of an anti-slip layer can significantly improve the result.

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

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	3%	2.32 kg / 2315.3 g 22.7 N
1 mm	8%	5.79 kg / 5788.3 g 56.8 N
2 mm	17%	11.58 kg / 11576.7 g 113.6 N
5 mm	42%	28.94 kg / 28941.7 g 283.9 N
10 mm	83%	57.88 kg / 57883.3 g 567.8 N

A thin metal plate is incapable of conduct the entire magnetic field, which squanders power of the holder. Should you install a neodymium to a thin surface, the field will pass right through and the attraction force will be weaker. To squeeze the maximum of this magnet's potential, you need a suitably thick backing of metal. The saturation phenomenon means that on sheet metal structures (e.g., appliance housings), the magnet holds weaker. We recommend selecting the steel cross-section from these parameters.

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

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	69.46 kg / 69460.0 g 681.4 N	OK
40 °C	-2.2%	67.93 kg / 67931.9 g 666.4 N	OK
60 °C	-4.4%	66.40 kg / 66403.8 g 651.4 N	OK
80 °C	-6.6%	64.88 kg / 64875.6 g 636.4 N
100 °C	-28.8%	49.46 kg / 49455.5 g 485.2 N

Classic neodymiums lose strength after exceeding the maximum temperature. Avoid high temperatures – high temperature can irreversibly destroy this product. With every degree above norm, the neodymium's capacity temporarily decreases. Avoid using this product close to ovens higher than its safe range. Ignoring the limit will lead to destruction of magnetic properties.

Table 5: Magnet-Magnet interaction (repulsion) - field range
MW 45x30 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	104.19 kg / 104190.0 g 1022.1 N	N/A
2 mm	86.72 kg / 86715.0 g 850.7 N	80.93 kg / 80934.0 g 794.0 N
5 mm	63.50 kg / 63495.0 g 622.9 N	59.26 kg / 59262.0 g 581.4 N
10 mm	35.30 kg / 35295.0 g 346.2 N	32.94 kg / 32942.0 g 323.2 N
20 mm	9.99 kg / 9990.0 g 98.0 N	9.32 kg / 9324.0 g 91.5 N
50 mm	0.42 kg / 420.0 g 4.1 N	0.39 kg / 392.0 g 3.8 N

Two strong neodymiums attract each other from a wider radius than a magnet and sheet combination. The connection of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Designing a strong closure? Use a pair of magnets instead of one magnet and a steel. Be careful that when bringing together two magnets, the collision energy is extreme. The levitation is slightly lower than the connection force, but still significant.

Table 6: Safety (HSE) (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

A strong magnetic field is a serious hazard to electronics and medical implants. These magnets produce a flux that destroys function of digital equipment. Be aware: the invisible magnetic field acts through matter and glass. Increased vigilance must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, car keys, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 7: Dynamics (kinetic energy) - collision effects
MW 45x30 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	16.76 km/h (4.66 m/s)	3.88 J
30 mm	24.77 km/h (6.88 m/s)	8.47 J
50 mm	31.50 km/h (8.75 m/s)	13.70 J
100 mm	44.44 km/h (12.34 m/s)	27.26 J

Neodymium magnets are prone to chipping – a violent impact against metal causes immediate chipping. Watch the impact speed – a magnet released freely 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 violently against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when working 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)

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: Hydrostatics and buoyancy
MW 45x30 / N38

Environment	Effective steel pull	Effect
Air (land)	69.46 kg	Standard
Water (riverbed)	79.53 kg (+10.07 kg Buoyancy gain)	+14.5%

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

The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.

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The offered product is a very strong rod magnet, composed of advanced NdFeB material, which, with dimensions of Ø45x30 mm, guarantees maximum efficiency. The MW 45x30 / N38 model features high dimensional repeatability and professional build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 69.46 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.

It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 681.39 N with a weight of only 357.85 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.

Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.

Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and operational stability. 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.

The presented product is a neodymium magnet with precisely defined parameters: diameter 45 mm and height 30 mm. The key parameter here is the lifting capacity amounting to approximately 69.46 kg (force ~681.39 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it 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. 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 through the diameter if your project requires it.

Strengths as well as weaknesses of neodymium magnets.

Besides their immense pulling force, neodymium magnets offer the following advantages:

Their strength remains stable, and after approximately ten years it decreases only by ~1% (according to research),
They retain their magnetic properties even under close interference source,
By using a lustrous coating of silver, the element has an aesthetic look,
They show high magnetic induction at the operating surface, which improves attraction properties,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
Due to the possibility of free forming and adaptation to custom solutions, NdFeB magnets can be created in a wide range of forms and dimensions, which expands the range of possible applications,
Wide application in electronics industry – they are commonly used in HDD drives, electric motors, diagnostic systems, also complex engineering applications.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in small systems

Disadvantages of NdFeB magnets:

At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
Limited possibility of producing threads in the magnet and complicated forms - recommended is cover - magnetic holder.
Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these products can complicate diagnosis medical in case of swallowing.
Due to expensive raw materials, their price exceeds standard values,

Best holding force of the magnet in ideal parameters – what it depends on?

Breakaway force was defined for the most favorable conditions, including:

with the use of a sheet made of low-carbon steel, guaranteeing maximum field concentration
possessing a thickness of minimum 10 mm to avoid saturation
with a plane cleaned and smooth
without the slightest insulating layer between the magnet and steel
for force acting at a right angle (in the magnet axis)
at temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Real force is influenced by working environment parameters, such as (from most important):

Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
Material composition – not every steel reacts the same. Alloy additives weaken the attraction effect.
Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a slight gap {between} the magnet’s surface and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets

Dust is flammable

Powder produced during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Sensitization to coating

Studies show that the nickel plating (standard magnet coating) is a strong allergen. For allergy sufferers, prevent direct skin contact and opt for coated magnets.

Electronic hazard

Do not bring magnets close to a wallet, laptop, or screen. The magnetism can permanently damage these devices and wipe information from cards.

Material brittleness

NdFeB magnets are sintered ceramics, which means they are very brittle. Collision of two magnets leads to them cracking into shards.

Choking Hazard

Adult use only. Tiny parts can be swallowed, causing serious injuries. Keep away from children and animals.

Handling rules

Before starting, read the rules. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Precision electronics

GPS units and smartphones are highly sensitive to magnetic fields. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Heat warning

Watch the temperature. Heating the magnet above 80 degrees Celsius will ruin its properties and strength.

Crushing risk

Large magnets can crush fingers instantly. Never place your hand between two strong magnets.

Life threat

Individuals with a ICD should keep an large gap from magnets. The magnetic field can stop the functioning of the life-saving device.

Warning!

Need more info? Check our post: 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

Engineering analysis of the magnet - technical parameters

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Strengths as well as weaknesses of neodymium magnets.

Best holding force of the magnet in ideal parameters – what it depends on?

Determinants of lifting force in real conditions

Safety rules for work with NdFeB magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C