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MW 18.9x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010036

GTIN/EAN: 5906301810353

5.00

Diameter Ø

18.9 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

21.04 g

Magnetization Direction

→ diametrical

Load capacity

11.68 kg / 114.54 N

Magnetic Induction

450.35 mT / 4503 Gs

Coating

[NiCuNi] Nickel

view parameters »

11.07 ZŁ with VAT / pcs + price for transport

9.00 ZŁ net + 23% VAT / pcs

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Detailed specification - MW 18.9x10 / N38 - cylindrical magnet

Specification / characteristics - MW 18.9x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010036
GTIN/EAN 5906301810353
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 18.9 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 21.04 g
Magnetization Direction → diametrical
Load capacity ~ ? 11.68 kg / 114.54 N
Magnetic Induction ~ ? 450.35 mT / 4503 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 18.9x10 / 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

Engineering analysis of the magnet - data

These information constitute the direct effect of a physical analysis. Values are based on algorithms for the material Nd2Fe14B. Real-world performance may differ. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - characteristics
MW 18.9x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4502 Gs
450.2 mT
 11.68 kg / 25.75 pounds
11680.0 g / 114.6 N
 critical level
1 mm 4050 Gs
405.0 mT
 9.46 kg / 20.85 pounds
9455.2 g / 92.8 N
 strong
2 mm 3587 Gs
358.7 mT
 7.42 kg / 16.35 pounds
7416.3 g / 72.8 N
 strong
3 mm 3139 Gs
313.9 mT
 5.68 kg / 12.52 pounds
5678.8 g / 55.7 N
 strong
5 mm 2346 Gs
234.6 mT
 3.17 kg / 6.99 pounds
3172.5 g / 31.1 N
 strong
10 mm 1100 Gs
110.0 mT
 0.70 kg / 1.54 pounds
696.7 g / 6.8 N
 weak grip
15 mm 554 Gs
55.4 mT
 0.18 kg / 0.39 pounds
176.7 g / 1.7 N
 weak grip
20 mm 308 Gs
30.8 mT
 0.05 kg / 0.12 pounds
54.6 g / 0.5 N
 weak grip
30 mm 120 Gs
12.0 mT
 0.01 kg / 0.02 pounds
8.3 g / 0.1 N
 weak grip
50 mm 32 Gs
3.2 mT
 0.00 kg / 0.00 pounds
0.6 g / 0.0 N
 weak grip
Grip strength weakens significantly with every subsequent millimeter of spacing. Remember that even a microscopic distance (e.g., dirt, paint, rust) strongly diminishes the holding power. Neodymiums operate most effectively in perfect adhesion; distance weakens the force. Observe how quickly the load capacity plummet, when the product does not adhere flatly to the metal substrate. When planning the assembly, eliminate unnecessary gaps.

Table 2: Sliding force (wall)
MW 18.9x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.34 kg / 5.15 pounds
2336.0 g / 22.9 N
1 mm Stal (~0.2) 1.89 kg / 4.17 pounds
1892.0 g / 18.6 N
2 mm Stal (~0.2) 1.48 kg / 3.27 pounds
1484.0 g / 14.6 N
3 mm Stal (~0.2) 1.14 kg / 2.50 pounds
1136.0 g / 11.1 N
5 mm Stal (~0.2) 0.63 kg / 1.40 pounds
634.0 g / 6.2 N
10 mm Stal (~0.2) 0.14 kg / 0.31 pounds
140.0 g / 1.4 N
15 mm Stal (~0.2) 0.04 kg / 0.08 pounds
36.0 g / 0.4 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data defines the estimated shear load necessary to cause the shifting of the magnet down along a vertical steel wall (assuming standard friction). The holding force depends on the air gap between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MW 18.9x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.50 kg / 7.72 pounds
3504.0 g / 34.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.34 kg / 5.15 pounds
2336.0 g / 22.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.17 kg / 2.57 pounds
1168.0 g / 11.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.84 kg / 12.87 pounds
5840.0 g / 57.3 N
When hanging a magnet on a upright wall (e.g., a fridge), it you can count on just about 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that magnets move down easier than they pull off. Want to create a hanger? Consider that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will give way down under a much lighter load. Application of an anti-slip layer can drastically raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 18.9x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.58 kg / 1.29 pounds
584.0 g / 5.7 N
1 mm
13%
 1.46 kg / 3.22 pounds
1460.0 g / 14.3 N
2 mm
25%
 2.92 kg / 6.44 pounds
2920.0 g / 28.6 N
3 mm
38%
 4.38 kg / 9.66 pounds
4380.0 g / 43.0 N
5 mm
63%
 7.30 kg / 16.09 pounds
7300.0 g / 71.6 N
10 mm
100%
 11.68 kg / 25.75 pounds
11680.0 g / 114.6 N
11 mm
100%
 11.68 kg / 25.75 pounds
11680.0 g / 114.6 N
12 mm
100%
 11.68 kg / 25.75 pounds
11680.0 g / 114.6 N
A thin metal plate is unable to focus the entire magnetic field, which squanders power of the holder. If you install a neodymium to a too thin substrate, the magnetism will pass right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's power, you require a sufficiently solid element of steel. The saturation effect means that on sheet metal structures (e.g., thin profiles), the product works worse. We suggest choosing the steel thickness based on the following data.

Table 5: Thermal stability (stability) - resistance threshold
MW 18.9x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.68 kg / 25.75 pounds
11680.0 g / 114.6 N
 OK
40 °C -2.2% 11.42 kg / 25.18 pounds
11423.0 g / 112.1 N
 OK
60 °C -4.4% 11.17 kg / 24.62 pounds
11166.1 g / 109.5 N
 OK
80 °C -6.6% 10.91 kg / 24.05 pounds
10909.1 g / 107.0 N
100 °C -28.8% 8.32 kg / 18.33 pounds
8316.2 g / 81.6 N
Standard neodymium magnets lose strength above the temperature limit. Watch out for overheating – excessive heat can permanently demagnetize this product. With every degree above norm, the neodymium's power temporarily lowers. Do not use this product close to heaters higher than its operating temperature limit. Too high temperature will lead to permanent loss of magnetism.
*Engineering note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Thin magnets (low Pc) are more susceptible to demagnetization sooner than long magnets. Red status in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 18.9x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 35.05 kg / 77.28 pounds
5 600 Gs
5.26 kg / 11.59 pounds
5258 g / 51.6 N
 N/A
1 mm 31.70 kg / 69.88 pounds
8 562 Gs
4.75 kg / 10.48 pounds
4754 g / 46.6 N
 28.53 kg / 62.89 pounds
~0 Gs
2 mm 28.38 kg / 62.56 pounds
8 101 Gs
4.26 kg / 9.38 pounds
4256 g / 41.8 N
 25.54 kg / 56.30 pounds
~0 Gs
3 mm 25.22 kg / 55.59 pounds
7 636 Gs
3.78 kg / 8.34 pounds
3782 g / 37.1 N
 22.69 kg / 50.03 pounds
~0 Gs
5 mm 19.53 kg / 43.05 pounds
6 720 Gs
2.93 kg / 6.46 pounds
2929 g / 28.7 N
 17.57 kg / 38.75 pounds
~0 Gs
10 mm 9.52 kg / 20.99 pounds
4 692 Gs
1.43 kg / 3.15 pounds
1428 g / 14.0 N
 8.57 kg / 18.89 pounds
~0 Gs
20 mm 2.09 kg / 4.61 pounds
2 199 Gs
0.31 kg / 0.69 pounds
314 g / 3.1 N
 1.88 kg / 4.15 pounds
~0 Gs
50 mm 0.06 kg / 0.13 pounds
372 Gs
0.01 kg / 0.02 pounds
9 g / 0.1 N
 0.05 kg / 0.12 pounds
~0 Gs
60 mm 0.03 kg / 0.06 pounds
241 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
70 mm 0.01 kg / 0.03 pounds
164 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
80 mm 0.01 kg / 0.01 pounds
116 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.01 pounds
86 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
65 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums interact from a much further distance than a neodymium and metal combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of operation. Want to build a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the impact force is massive. The repulsion force is slightly lower than the connection force, but still large.
*The magnetic induction between like poles is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
* Calculations refer to friction force of dual same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - warnings
MW 18.9x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.0 cm
Hearing aid 10 Gs (1.0 mT) 8.0 cm
Mechanical watch 20 Gs (2.0 mT) 6.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.0 cm
Remote 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Powerful magnet radiation poses a real danger to electronics and pacemakers. These magnets produce a flux that destroys function of digital equipment. Notice: the unseen radiation acts through matter and housings. Exceptional care must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MW 18.9x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.63 km/h
(6.84 m/s)
 0.49 J
30 mm 41.18 km/h
(11.44 m/s)
 1.38 J
50 mm 53.13 km/h
(14.76 m/s)
 2.29 J
100 mm 75.14 km/h
(20.87 m/s)
 4.58 J
NdFeB products are prone to chipping – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or dangerous crushing to fingers. 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 neodymium. Use safety goggles when working with powerful specimens.

Table 9: Corrosion resistance
MW 18.9x10 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MW 18.9x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 12 775 Mx 127.7 µWb
Pc Coefficient 0.61 High (Stable)
Total magnetic flux emitted by the magnet pole. Key data when building generators as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MW 18.9x10 / N38

Environment Effective steel pull Effect
Air (land) 11.68 kg Standard
Water (riverbed) 13.37 kg
(+1.69 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

*Warning: On a vertical surface, the magnet holds merely ~20% of its perpendicular strength.

2. Steel saturation

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

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.61

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%
Environmental data
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: 010036-2026
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This product is an incredibly powerful rod magnet, composed of durable NdFeB material, which, with dimensions of Ø18.9x10 mm, guarantees optimal power. This specific item is characterized by high dimensional repeatability and industrial build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 11.68 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 114.54 N with a weight of only 21.04 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 18.9.1 mm) using two-component epoxy glues. To ensure stability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø18.9x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø18.9x10 mm, which, at a weight of 21.04 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 11.68 kg (force ~114.54 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.
This cylinder is magnetized axially (along the height of 10 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable 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.

Advantages and disadvantages of rare earth magnets.

Strengths

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
  • They retain full power for around ten years – the drop is just ~1% (based on simulations),
  • They are resistant to demagnetization induced by external disturbances,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Neodymium magnets deliver maximum magnetic induction on a small area, which increases force concentration,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
  • Thanks to flexibility in constructing and the capacity to customize to client solutions,
  • Key role in modern industrial fields – they are commonly used in HDD drives, brushless drives, advanced medical instruments, also other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

What to avoid - cons of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we recommend 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 casing - magnet mounting.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these devices can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Detachment force of the magnet in optimal conditions – what it depends on?

The load parameter shown concerns the limit force, recorded under optimal environment, specifically:
  • using a base made of mild steel, serving as a ideal flux conductor
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a plane free of scratches
  • without any clearance between the magnet and steel
  • under axial force direction (90-degree angle)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

It is worth knowing that the application force will differ influenced by the following factors, in order of importance:
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Load vector – highest force is obtained only during perpendicular pulling. The shear force of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel attracts best. Higher carbon content lower magnetic permeability and holding force.
  • Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal environment – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate decreases the load capacity.

Precautions when working with neodymium magnets
This is not a toy

NdFeB magnets are not toys. Accidental ingestion of a few magnets can lead to them attracting across intestines, which poses a direct threat to life and necessitates urgent medical intervention.

Metal Allergy

Some people have a sensitization to nickel, which is the common plating for neodymium magnets. Frequent touching might lead to skin redness. It is best to wear safety gloves.

Cards and drives

Intense magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.

Pacemakers

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Beware of splinters

Watch out for shards. Magnets can explode upon violent connection, launching sharp fragments into the air. Wear goggles.

Heat sensitivity

Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. This process is irreversible.

Respect the power

Use magnets with awareness. Their huge power can surprise even professionals. Stay alert and do not underestimate their power.

Bone fractures

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, crushing anything in their path. Be careful!

GPS and phone interference

Be aware: rare earth magnets generate a field that interferes with precision electronics. Keep a safe distance from your phone, device, and navigation systems.

Machining danger

Mechanical processing of NdFeB material poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Attention! Need more info? Check our post: Why are neodymium magnets dangerous?