MW 18.9x10 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010036
GTIN/EAN: 5906301810353
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
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 | values |
|---|---|
| Cat. no. | 010036 |
| GTIN/EAN | 5906301810353 |
| Production/Distribution | Dhit sp. z o.o. |
| 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
| 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
| 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 modeling of the product - data
The following data are the result of a physical calculation. Values were calculated on models for the class Nd2Fe14B. Operational performance might slightly differ from theoretical values. Please consider these calculations as a supplementary guide when designing systems.
Table 1: Static force (force vs gap) - interaction chart
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 lbs
11680.0 g / 114.6 N
|
critical level |
| 1 mm |
4050 Gs
405.0 mT
|
9.46 kg / 20.85 lbs
9455.2 g / 92.8 N
|
strong |
| 2 mm |
3587 Gs
358.7 mT
|
7.42 kg / 16.35 lbs
7416.3 g / 72.8 N
|
strong |
| 3 mm |
3139 Gs
313.9 mT
|
5.68 kg / 12.52 lbs
5678.8 g / 55.7 N
|
strong |
| 5 mm |
2346 Gs
234.6 mT
|
3.17 kg / 6.99 lbs
3172.5 g / 31.1 N
|
strong |
| 10 mm |
1100 Gs
110.0 mT
|
0.70 kg / 1.54 lbs
696.7 g / 6.8 N
|
safe |
| 15 mm |
554 Gs
55.4 mT
|
0.18 kg / 0.39 lbs
176.7 g / 1.7 N
|
safe |
| 20 mm |
308 Gs
30.8 mT
|
0.05 kg / 0.12 lbs
54.6 g / 0.5 N
|
safe |
| 30 mm |
120 Gs
12.0 mT
|
0.01 kg / 0.02 lbs
8.3 g / 0.1 N
|
safe |
| 50 mm |
32 Gs
3.2 mT
|
0.00 kg / 0.00 lbs
0.6 g / 0.0 N
|
safe |
Table 2: Shear capacity (vertical surface)
MW 18.9x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
2.34 kg / 5.15 lbs
2336.0 g / 22.9 N
|
| 1 mm | Stal (~0.2) |
1.89 kg / 4.17 lbs
1892.0 g / 18.6 N
|
| 2 mm | Stal (~0.2) |
1.48 kg / 3.27 lbs
1484.0 g / 14.6 N
|
| 3 mm | Stal (~0.2) |
1.14 kg / 2.50 lbs
1136.0 g / 11.1 N
|
| 5 mm | Stal (~0.2) |
0.63 kg / 1.40 lbs
634.0 g / 6.2 N
|
| 10 mm | Stal (~0.2) |
0.14 kg / 0.31 lbs
140.0 g / 1.4 N
|
| 15 mm | Stal (~0.2) |
0.04 kg / 0.08 lbs
36.0 g / 0.4 N
|
| 20 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
10.0 g / 0.1 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
Table 3: Wall mounting (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 lbs
3504.0 g / 34.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.34 kg / 5.15 lbs
2336.0 g / 22.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.17 kg / 2.57 lbs
1168.0 g / 11.5 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
5.84 kg / 12.87 lbs
5840.0 g / 57.3 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 18.9x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.58 kg / 1.29 lbs
584.0 g / 5.7 N
|
| 1 mm |
|
1.46 kg / 3.22 lbs
1460.0 g / 14.3 N
|
| 2 mm |
|
2.92 kg / 6.44 lbs
2920.0 g / 28.6 N
|
| 3 mm |
|
4.38 kg / 9.66 lbs
4380.0 g / 43.0 N
|
| 5 mm |
|
7.30 kg / 16.09 lbs
7300.0 g / 71.6 N
|
| 10 mm |
|
11.68 kg / 25.75 lbs
11680.0 g / 114.6 N
|
| 11 mm |
|
11.68 kg / 25.75 lbs
11680.0 g / 114.6 N
|
| 12 mm |
|
11.68 kg / 25.75 lbs
11680.0 g / 114.6 N
|
Table 5: Thermal stability (material behavior) - power drop
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 lbs
11680.0 g / 114.6 N
|
OK |
| 40 °C | -2.2% |
11.42 kg / 25.18 lbs
11423.0 g / 112.1 N
|
OK |
| 60 °C | -4.4% |
11.17 kg / 24.62 lbs
11166.1 g / 109.5 N
|
OK |
| 80 °C | -6.6% |
10.91 kg / 24.05 lbs
10909.1 g / 107.0 N
|
|
| 100 °C | -28.8% |
8.32 kg / 18.33 lbs
8316.2 g / 81.6 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 18.9x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
35.05 kg / 77.28 lbs
5 600 Gs
|
5.26 kg / 11.59 lbs
5258 g / 51.6 N
|
N/A |
| 1 mm |
31.70 kg / 69.88 lbs
8 562 Gs
|
4.75 kg / 10.48 lbs
4754 g / 46.6 N
|
28.53 kg / 62.89 lbs
~0 Gs
|
| 2 mm |
28.38 kg / 62.56 lbs
8 101 Gs
|
4.26 kg / 9.38 lbs
4256 g / 41.8 N
|
25.54 kg / 56.30 lbs
~0 Gs
|
| 3 mm |
25.22 kg / 55.59 lbs
7 636 Gs
|
3.78 kg / 8.34 lbs
3782 g / 37.1 N
|
22.69 kg / 50.03 lbs
~0 Gs
|
| 5 mm |
19.53 kg / 43.05 lbs
6 720 Gs
|
2.93 kg / 6.46 lbs
2929 g / 28.7 N
|
17.57 kg / 38.75 lbs
~0 Gs
|
| 10 mm |
9.52 kg / 20.99 lbs
4 692 Gs
|
1.43 kg / 3.15 lbs
1428 g / 14.0 N
|
8.57 kg / 18.89 lbs
~0 Gs
|
| 20 mm |
2.09 kg / 4.61 lbs
2 199 Gs
|
0.31 kg / 0.69 lbs
314 g / 3.1 N
|
1.88 kg / 4.15 lbs
~0 Gs
|
| 50 mm |
0.06 kg / 0.13 lbs
372 Gs
|
0.01 kg / 0.02 lbs
9 g / 0.1 N
|
0.05 kg / 0.12 lbs
~0 Gs
|
| 60 mm |
0.03 kg / 0.06 lbs
241 Gs
|
0.00 kg / 0.01 lbs
4 g / 0.0 N
|
0.02 kg / 0.05 lbs
~0 Gs
|
| 70 mm |
0.01 kg / 0.03 lbs
164 Gs
|
0.00 kg / 0.00 lbs
2 g / 0.0 N
|
0.01 kg / 0.02 lbs
~0 Gs
|
| 80 mm |
0.01 kg / 0.01 lbs
116 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 90 mm |
0.00 kg / 0.01 lbs
86 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 lbs
65 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Protective zones (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 |
| Car key | 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 |
Table 8: Collisions (cracking risk) - 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 |
Table 9: Surface protection spec
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) |
Table 10: Construction data (Flux)
MW 18.9x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 12 775 Mx | 127.7 µWb |
| Pc Coefficient | 0.61 | High (Stable) |
Table 11: Hydrostatics and buoyancy
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% |
1. Vertical hold
*Warning: On a vertical surface, the magnet holds only approx. 20-30% of its nominal pull.
2. Plate thickness effect
*Thin steel (e.g. computer case) drastically limits the holding force.
3. Thermal stability
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.61
This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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.
Material specification
| 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 |
Other proposals
Advantages as well as disadvantages of rare earth magnets.
Strengths
- They retain full power for around 10 years – the loss is just ~1% (in theory),
- They are extremely resistant to demagnetization induced by presence of other magnetic fields,
- By using a shiny coating of nickel, the element has an proper look,
- Magnets have huge magnetic induction on the outer layer,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- In view of the ability of flexible forming and customization to custom needs, NdFeB magnets can be manufactured in a broad palette of geometric configurations, which makes them more universal,
- Versatile presence in future technologies – they are used in magnetic memories, motor assemblies, diagnostic systems, and multitasking production systems.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Cons
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
- When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- Limited possibility of producing nuts in the magnet and complex forms - preferred is a housing - magnet mounting.
- Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
- Due to expensive raw materials, their price is higher than average,
Lifting parameters
Maximum lifting force for a neodymium magnet – what it depends on?
- with the contact of a sheet made of low-carbon steel, guaranteeing maximum field concentration
- possessing a massiveness of at least 10 mm to ensure full flux closure
- with an ideally smooth touching surface
- with zero gap (no coatings)
- during detachment in a direction perpendicular to the mounting surface
- at room temperature
Determinants of lifting force in real conditions
- Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Steel type – mild steel gives the best results. Higher carbon content decrease magnetic permeability and lifting capacity.
- Surface structure – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
- Thermal factor – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.
Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.
H&S for magnets
Dust explosion hazard
Drilling and cutting of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Data carriers
Powerful magnetic fields can destroy records on credit cards, hard drives, and storage devices. Stay away of min. 10 cm.
Danger to the youngest
NdFeB magnets are not suitable for play. Swallowing several magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates urgent medical intervention.
Warning for heart patients
For implant holders: Powerful magnets affect medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.
Heat sensitivity
Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.
Safe operation
Exercise caution. Rare earth magnets act from a long distance and snap with huge force, often quicker than you can move away.
Precision electronics
GPS units and mobile phones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.
Eye protection
Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Clashing of two magnets will cause them breaking into small pieces.
Serious injuries
Big blocks can break fingers instantly. Under no circumstances put your hand betwixt two strong magnets.
Avoid contact if allergic
Studies show that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent direct skin contact and select encased magnets.
