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MW 28.9x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010051

GTIN/EAN: 5906301810506

Diameter Ø

28.9 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

49.2 g

Magnetization Direction

→ diametrical

Load capacity

20.74 kg / 203.46 N

Magnetic Induction

352.70 mT / 3527 Gs

Coating

[NiCuNi] Nickel

see specifications »

23.99 ZŁ with VAT / pcs + price for transport

19.50 ZŁ net + 23% VAT / pcs

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Lifting power along with form of neodymium magnets can be checked with our force calculator.

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Physical properties - MW 28.9x10 / N38 - cylindrical magnet

Specification / characteristics - MW 28.9x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010051
GTIN/EAN 5906301810506
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 28.9 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 49.2 g
Magnetization Direction → diametrical
Load capacity ~ ? 20.74 kg / 203.46 N
Magnetic Induction ~ ? 352.70 mT / 3527 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 28.9x10 / 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

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

Technical simulation of the assembly - report

These data are the result of a mathematical analysis. Results rely on models for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - interaction chart
MW 28.9x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3526 Gs
352.6 mT
 20.74 kg / 45.72 lbs
20740.0 g / 203.5 N
 dangerous!
1 mm 3327 Gs
332.7 mT
 18.47 kg / 40.71 lbs
18466.2 g / 181.2 N
 dangerous!
2 mm 3111 Gs
311.1 mT
 16.14 kg / 35.59 lbs
16142.6 g / 158.4 N
 dangerous!
3 mm 2886 Gs
288.6 mT
 13.90 kg / 30.63 lbs
13895.8 g / 136.3 N
 dangerous!
5 mm 2438 Gs
243.8 mT
 9.91 kg / 21.85 lbs
9912.0 g / 97.2 N
 medium risk
10 mm 1497 Gs
149.7 mT
 3.74 kg / 8.24 lbs
3739.6 g / 36.7 N
 medium risk
15 mm 903 Gs
90.3 mT
 1.36 kg / 3.00 lbs
1359.1 g / 13.3 N
 weak grip
20 mm 560 Gs
56.0 mT
 0.52 kg / 1.15 lbs
523.5 g / 5.1 N
 weak grip
30 mm 245 Gs
24.5 mT
 0.10 kg / 0.22 lbs
100.4 g / 1.0 N
 weak grip
50 mm 71 Gs
7.1 mT
 0.01 kg / 0.02 lbs
8.5 g / 0.1 N
 weak grip
Pulling power decreases drastically with every mm of spacing. Note that even a microscopic distance (e.g., dirt, varnish, dust) significantly weakens the grip. Magnets hold most effectively at the point of direct contact; distance drastically cuts the force. See how flashily the parameters plummet, when the product does not adhere tightly to the metal substrate. When designing the arrangement, eliminate additional spacers.

Table 2: Vertical capacity (vertical surface)
MW 28.9x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.15 kg / 9.14 lbs
4148.0 g / 40.7 N
1 mm Stal (~0.2) 3.69 kg / 8.14 lbs
3694.0 g / 36.2 N
2 mm Stal (~0.2) 3.23 kg / 7.12 lbs
3228.0 g / 31.7 N
3 mm Stal (~0.2) 2.78 kg / 6.13 lbs
2780.0 g / 27.3 N
5 mm Stal (~0.2) 1.98 kg / 4.37 lbs
1982.0 g / 19.4 N
10 mm Stal (~0.2) 0.75 kg / 1.65 lbs
748.0 g / 7.3 N
15 mm Stal (~0.2) 0.27 kg / 0.60 lbs
272.0 g / 2.7 N
20 mm Stal (~0.2) 0.10 kg / 0.23 lbs
104.0 g / 1.0 N
30 mm Stal (~0.2) 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
The table below calculates the theoretical shear load necessary to start the sliding of the magnet down against a upright metal surface (assuming standard friction coefficient). This value is a function of the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 28.9x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
6.22 kg / 13.72 lbs
6222.0 g / 61.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.15 kg / 9.14 lbs
4148.0 g / 40.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.07 kg / 4.57 lbs
2074.0 g / 20.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
10.37 kg / 22.86 lbs
10370.0 g / 101.7 N
When hanging a holder on a vertical plane (e.g., a board), it you can count on only about 1/5 of its nominal power. Gravity and a low friction coefficient cause that holders slip easier than they detach. Planning a vertical fastening? Note that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the holder will give way down under a significantly smaller cargo. Application of an anti-slip pad can drastically increase the grip.

Table 4: Material efficiency (saturation) - power losses
MW 28.9x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.04 kg / 2.29 lbs
1037.0 g / 10.2 N
1 mm
13%
 2.59 kg / 5.72 lbs
2592.5 g / 25.4 N
2 mm
25%
 5.19 kg / 11.43 lbs
5185.0 g / 50.9 N
3 mm
38%
 7.78 kg / 17.15 lbs
7777.5 g / 76.3 N
5 mm
63%
 12.96 kg / 28.58 lbs
12962.5 g / 127.2 N
10 mm
100%
 20.74 kg / 45.72 lbs
20740.0 g / 203.5 N
11 mm
100%
 20.74 kg / 45.72 lbs
20740.0 g / 203.5 N
12 mm
100%
 20.74 kg / 45.72 lbs
20740.0 g / 203.5 N
A thin metal plate is incapable of conduct the entire magnetic field, which wastes potential of the magnet. If you attach a powerful product to a too thin substrate, the field will pass right through and the holding will be smaller. To utilize 100% of this magnet's potential, you require a sufficiently solid backing of steel. The saturation effect causes that on delicate walls (e.g., car bodies), the holder works worse. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal resistance (material behavior) - resistance threshold
MW 28.9x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 20.74 kg / 45.72 lbs
20740.0 g / 203.5 N
 OK
40 °C -2.2% 20.28 kg / 44.72 lbs
20283.7 g / 199.0 N
 OK
60 °C -4.4% 19.83 kg / 43.71 lbs
19827.4 g / 194.5 N
80 °C -6.6% 19.37 kg / 42.71 lbs
19371.2 g / 190.0 N
100 °C -28.8% 14.77 kg / 32.56 lbs
14766.9 g / 144.9 N
Ordinary NdFeB products lose power past the thermal threshold. Watch out for overheating – heat can permanently demagnetize this product. With increasing heat, the magnet's power briefly drops. Avoid using this product in hot environments higher than its working range. Exceeding the critical threshold will lead to permanent loss of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Thin magnets (low Pc) may lose charge permanently sooner compared to rod magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MW 28.9x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 50.29 kg / 110.86 lbs
5 022 Gs
7.54 kg / 16.63 lbs
7543 g / 74.0 N
 N/A
1 mm 47.58 kg / 104.90 lbs
6 860 Gs
7.14 kg / 15.74 lbs
7138 g / 70.0 N
 42.83 kg / 94.41 lbs
~0 Gs
2 mm 44.77 kg / 98.71 lbs
6 655 Gs
6.72 kg / 14.81 lbs
6716 g / 65.9 N
 40.30 kg / 88.84 lbs
~0 Gs
3 mm 41.95 kg / 92.48 lbs
6 441 Gs
6.29 kg / 13.87 lbs
6292 g / 61.7 N
 37.75 kg / 83.23 lbs
~0 Gs
5 mm 36.38 kg / 80.20 lbs
5 999 Gs
5.46 kg / 12.03 lbs
5457 g / 53.5 N
 32.74 kg / 72.18 lbs
~0 Gs
10 mm 24.03 kg / 52.98 lbs
4 876 Gs
3.60 kg / 7.95 lbs
3605 g / 35.4 N
 21.63 kg / 47.69 lbs
~0 Gs
20 mm 9.07 kg / 19.99 lbs
2 995 Gs
1.36 kg / 3.00 lbs
1360 g / 13.3 N
 8.16 kg / 17.99 lbs
~0 Gs
50 mm 0.53 kg / 1.17 lbs
726 Gs
0.08 kg / 0.18 lbs
80 g / 0.8 N
 0.48 kg / 1.06 lbs
~0 Gs
60 mm 0.24 kg / 0.54 lbs
491 Gs
0.04 kg / 0.08 lbs
37 g / 0.4 N
 0.22 kg / 0.48 lbs
~0 Gs
70 mm 0.12 kg / 0.26 lbs
345 Gs
0.02 kg / 0.04 lbs
18 g / 0.2 N
 0.11 kg / 0.24 lbs
~0 Gs
80 mm 0.06 kg / 0.14 lbs
250 Gs
0.01 kg / 0.02 lbs
9 g / 0.1 N
 0.06 kg / 0.13 lbs
~0 Gs
90 mm 0.04 kg / 0.08 lbs
187 Gs
0.01 kg / 0.01 lbs
5 g / 0.1 N
 0.03 kg / 0.07 lbs
~0 Gs
100 mm 0.02 kg / 0.05 lbs
143 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
Two magnetic products interact from a wider radius than a neodymium and metal setup. The connection of two magnets creates a more powerful interaction and a larger range of action. Planning to create a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the pinch force is extreme. The repulsion force is slightly lower than the connection force, but still significant.
*Flux density for N-N configuration reaches ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Note: Results refer to sliding force of a pair of same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - warnings
MW 28.9x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.5 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Timepiece 20 Gs (2.0 mT) 8.5 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Car key 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
A strong magnetic field is a real danger to IT equipment and pacemakers. These NdFeB products produce a flux that destroys function of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and plastic. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
MW 28.9x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.92 km/h
(6.37 m/s)
 1.00 J
30 mm 35.97 km/h
(9.99 m/s)
 2.46 J
50 mm 46.31 km/h
(12.86 m/s)
 4.07 J
100 mm 65.48 km/h
(18.19 m/s)
 8.14 J
Magnetic elements are prone to chipping – a collision with steel risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Kinetic force can trigger coating fragments or injury to skin. Always hold the magnet during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Coating parameters (durability)
MW 28.9x10 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Pc)
MW 28.9x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 24 347 Mx 243.5 µWb
Pc Coefficient 0.45 Low (Flat)
Total magnetic flux passing through the pole surface. Key data in coil applications as well as sensors. Pc value defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MW 28.9x10 / N38

Environment Effective steel pull Effect
Air (land) 20.74 kg Standard
Water (riverbed) 23.75 kg
(+3.01 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Note: On a vertical surface, the magnet holds merely ~20% of its max power.

2. Efficiency vs thickness

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.45

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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 Pc (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 Pc 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%
Ecology and recycling (GPSR)
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: 010051-2026
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The offered product is an extremely powerful rod magnet, composed of durable NdFeB material, which, at dimensions of Ø28.9x10 mm, guarantees the highest energy density. This specific item boasts 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. 20.74 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 203.46 N with a weight of only 49.2 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure stability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are suitable for 90% of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø28.9x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 28.9 mm and height 10 mm. The key parameter here is the lifting capacity amounting to approximately 20.74 kg (force ~203.46 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 10 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 through the diameter if your project requires it.

Strengths as well as weaknesses of neodymium magnets.

Pros

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • They retain magnetic properties for almost ten years – the drop is just ~1% (based on simulations),
  • They retain their magnetic properties even under external field action,
  • A magnet with a smooth gold surface is more attractive,
  • Neodymium magnets ensure maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • 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...
  • Thanks to flexibility in shaping and the ability to customize to complex applications,
  • Versatile presence in electronics industry – they find application in computer drives, electromotive mechanisms, medical equipment, also complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Weaknesses

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • We recommend casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated shapes.
  • Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important 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 budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

Holding force of 20.74 kg is a theoretical maximum value performed under standard conditions:
  • using a plate made of high-permeability steel, acting as a circuit closing element
  • with a thickness no less than 10 mm
  • characterized by even structure
  • without any air gap between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • at room temperature

Magnet lifting force in use – key factors

Holding efficiency impacted by specific conditions, mainly (from priority):
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Metal type – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under shearing force the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

H&S for magnets
Do not give to children

NdFeB magnets are not toys. Eating a few magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and necessitates urgent medical intervention.

Warning for allergy sufferers

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, avoid touching magnets with bare hands and select coated magnets.

Pinching danger

Mind your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

Health Danger

Individuals with a pacemaker must maintain an absolute distance from magnets. The magnetism can interfere with the operation of the life-saving device.

Magnetic interference

Remember: rare earth magnets produce a field that disrupts sensitive sensors. Keep a separation from your phone, device, and GPS.

Fire warning

Dust generated during grinding of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Cards and drives

Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Thermal limits

Monitor thermal conditions. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.

Do not underestimate power

Handle with care. Rare earth magnets act from a long distance and connect with massive power, often faster than you can react.

Protective goggles

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets will cause them shattering into small pieces.

Safety First! Details about hazards in the article: Safety of working with magnets.