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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Technical - 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 |
Physical simulation of the magnet - report
The following data constitute the direct effect of a physical simulation. Results are based on models for the class Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Use these data as a reference point during assembly planning.
Table 1: Static force (force vs distance) - 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
|
crushing |
| 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
|
weak grip |
| 15 mm |
554 Gs
55.4 mT
|
0.18 kg / 0.39 LBS
176.7 g / 1.7 N
|
weak grip |
| 20 mm |
308 Gs
30.8 mT
|
0.05 kg / 0.12 LBS
54.6 g / 0.5 N
|
weak grip |
| 30 mm |
120 Gs
12.0 mT
|
0.01 kg / 0.02 LBS
8.3 g / 0.1 N
|
weak grip |
| 50 mm |
32 Gs
3.2 mT
|
0.00 kg / 0.00 LBS
0.6 g / 0.0 N
|
weak grip |
Table 2: Sliding load (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 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: Vertical assembly (sliding) - behavior on slippery surfaces
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: Material efficiency (substrate influence) - power losses
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) - thermal limit
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: Two magnets (attraction) - field range
MW 18.9x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (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: 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 |
Table 8: Dynamics (cracking risk) - collision effects
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: Electrical 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: Underwater work (magnet fishing)
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. Sliding resistance
*Warning: On a vertical surface, the magnet holds merely ~20% of its max power.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) drastically reduces 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.
Elemental analysis
| 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 |
Other proposals
Advantages and disadvantages of rare earth magnets.
Pros
- They retain full power for around ten years – the loss is just ~1% (according to analyses),
- Neodymium magnets are characterized by exceptionally resistant to magnetic field loss caused by magnetic disturbances,
- In other words, due to the smooth surface of silver, the element is aesthetically pleasing,
- They are known for high magnetic induction at the operating surface, which improves attraction properties,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
- Thanks to freedom in forming and the ability to adapt to individual projects,
- Huge importance in modern technologies – they serve a role in hard drives, drive modules, precision medical tools, and complex engineering applications.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Cons
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
- We suggest casing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complicated forms.
- Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical in case of swallowing.
- Due to expensive raw materials, their price is relatively high,
Pull force analysis
Best holding force of the magnet in ideal parameters – what it depends on?
- with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
- possessing a thickness of min. 10 mm to ensure full flux closure
- with a surface free of scratches
- with direct contact (no coatings)
- during detachment in a direction perpendicular to the plane
- at room temperature
Practical lifting capacity: influencing factors
- Clearance – existence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
- Angle of force application – highest force is reached only during perpendicular pulling. The shear force of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
- Material composition – not every steel reacts the same. Alloy additives worsen the attraction effect.
- Surface condition – ground elements guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
- Thermal environment – temperature increase causes a temporary drop of induction. Check the maximum operating temperature for a given model.
Lifting capacity was determined by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate lowers the load capacity.
Warnings
Data carriers
Avoid bringing magnets near a purse, laptop, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.
Bone fractures
Big blocks can crush fingers in a fraction of a second. Never put your hand between two strong magnets.
Keep away from children
Strictly store magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are very dangerous.
Life threat
People with a heart stimulator must maintain an safe separation from magnets. The magnetic field can stop the operation of the implant.
Shattering risk
Neodymium magnets are sintered ceramics, which means they are fragile like glass. Collision of two magnets leads to them breaking into small pieces.
Allergy Warning
Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If skin irritation appears, immediately stop working with magnets and use protective gear.
Threat to navigation
Be aware: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a safe distance from your phone, device, and GPS.
Handling rules
Use magnets consciously. Their immense force can shock even experienced users. Plan your moves and do not underestimate their force.
Fire risk
Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.
Maximum temperature
Keep cool. NdFeB magnets are sensitive to heat. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).
