MW 15x4 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010030
GTIN/EAN: 5906301810292
Diameter Ø
15 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
5.3 g
Magnetization Direction
↑ axial
Load capacity
4.22 kg / 41.38 N
Magnetic Induction
291.60 mT / 2916 Gs
Coating
[NiCuNi] Nickel
1.968 ZŁ with VAT / pcs + price for transport
1.600 ZŁ net + 23% VAT / pcs
bulk discounts:
Need more?Looking for a better price?
Call us
+48 888 99 98 98
otherwise send us a note via
request form
the contact form page.
Weight as well as appearance of a magnet can be checked with our
magnetic calculator.
Orders submitted before 14:00 will be dispatched today!
MW 15x4 / N38 - cylindrical magnet
Specification / characteristics MW 15x4 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010030 |
| GTIN/EAN | 5906301810292 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 15 mm [±0,1 mm] |
| Height | 4 mm [±0,1 mm] |
| Weight | 5.3 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 4.22 kg / 41.38 N |
| Magnetic Induction ~ ? | 291.60 mT / 2916 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 analysis of the product - report
These information are the direct effect of a engineering simulation. Results rely on algorithms for the class Nd2Fe14B. Operational parameters may deviate from the simulation results. Treat these data as a supplementary guide for designers.
MW 15x4 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
2915 Gs
291.5 mT
|
4.22 kg / 4220.0 g
41.4 N
|
medium risk |
| 1 mm |
2620 Gs
262.0 mT
|
3.41 kg / 3408.2 g
33.4 N
|
medium risk |
| 2 mm |
2276 Gs
227.6 mT
|
2.57 kg / 2571.6 g
25.2 N
|
medium risk |
| 3 mm |
1928 Gs
192.8 mT
|
1.85 kg / 1845.5 g
18.1 N
|
weak grip |
| 5 mm |
1324 Gs
132.4 mT
|
0.87 kg / 870.3 g
8.5 N
|
weak grip |
| 10 mm |
505 Gs
50.5 mT
|
0.13 kg / 126.7 g
1.2 N
|
weak grip |
| 15 mm |
222 Gs
22.2 mT
|
0.02 kg / 24.4 g
0.2 N
|
weak grip |
| 20 mm |
113 Gs
11.3 mT
|
0.01 kg / 6.3 g
0.1 N
|
weak grip |
| 30 mm |
40 Gs
4.0 mT
|
0.00 kg / 0.8 g
0.0 N
|
weak grip |
| 50 mm |
10 Gs
1.0 mT
|
0.00 kg / 0.0 g
0.0 N
|
weak grip |
MW 15x4 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.84 kg / 844.0 g
8.3 N
|
| 1 mm | Stal (~0.2) |
0.68 kg / 682.0 g
6.7 N
|
| 2 mm | Stal (~0.2) |
0.51 kg / 514.0 g
5.0 N
|
| 3 mm | Stal (~0.2) |
0.37 kg / 370.0 g
3.6 N
|
| 5 mm | Stal (~0.2) |
0.17 kg / 174.0 g
1.7 N
|
| 10 mm | Stal (~0.2) |
0.03 kg / 26.0 g
0.3 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 4.0 g
0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 2.0 g
0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
MW 15x4 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.27 kg / 1266.0 g
12.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.84 kg / 844.0 g
8.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.42 kg / 422.0 g
4.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.11 kg / 2110.0 g
20.7 N
|
MW 15x4 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
0.42 kg / 422.0 g
4.1 N
|
| 1 mm |
|
1.06 kg / 1055.0 g
10.3 N
|
| 2 mm |
|
2.11 kg / 2110.0 g
20.7 N
|
| 5 mm |
|
4.22 kg / 4220.0 g
41.4 N
|
| 10 mm |
|
4.22 kg / 4220.0 g
41.4 N
|
MW 15x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
4.22 kg / 4220.0 g
41.4 N
|
OK |
| 40 °C | -2.2% |
4.13 kg / 4127.2 g
40.5 N
|
OK |
| 60 °C | -4.4% |
4.03 kg / 4034.3 g
39.6 N
|
|
| 80 °C | -6.6% |
3.94 kg / 3941.5 g
38.7 N
|
|
| 100 °C | -28.8% |
3.00 kg / 3004.6 g
29.5 N
|
MW 15x4 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
9.26 kg / 9258 g
90.8 N
4 518 Gs
|
N/A |
| 1 mm |
8.40 kg / 8404 g
82.4 N
5 555 Gs
|
7.56 kg / 7564 g
74.2 N
~0 Gs
|
| 2 mm |
7.48 kg / 7477 g
73.3 N
5 239 Gs
|
6.73 kg / 6729 g
66.0 N
~0 Gs
|
| 3 mm |
6.54 kg / 6542 g
64.2 N
4 901 Gs
|
5.89 kg / 5888 g
57.8 N
~0 Gs
|
| 5 mm |
4.80 kg / 4804 g
47.1 N
4 200 Gs
|
4.32 kg / 4324 g
42.4 N
~0 Gs
|
| 10 mm |
1.91 kg / 1909 g
18.7 N
2 648 Gs
|
1.72 kg / 1718 g
16.9 N
~0 Gs
|
| 20 mm |
0.28 kg / 278 g
2.7 N
1 010 Gs
|
0.25 kg / 250 g
2.5 N
~0 Gs
|
| 50 mm |
0.00 kg / 4 g
0.0 N
128 Gs
|
0.00 kg / 0 g
0.0 N
~0 Gs
|
MW 15x4 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 4.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.0 cm |
| Car key | 50 Gs (5.0 mT) | 3.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
MW 15x4 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
28.99 km/h
(8.05 m/s)
|
0.17 J | |
| 30 mm |
49.30 km/h
(13.69 m/s)
|
0.50 J | |
| 50 mm |
63.63 km/h
(17.68 m/s)
|
0.83 J | |
| 100 mm |
89.99 km/h
(25.00 m/s)
|
1.66 J |
MW 15x4 / 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) |
MW 15x4 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 5 659 Mx | 56.6 µWb |
| Pc Coefficient | 0.37 | Low (Flat) |
MW 15x4 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 4.22 kg | Standard |
| Water (riverbed) |
4.83 kg
(+0.61 kg Buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Caution: On a vertical wall, the magnet retains merely a fraction of its perpendicular strength.
2. Plate thickness effect
*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.
3. Temperature resistance
*For N38 grade, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.37
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.
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 |
See more proposals
Pros and cons of neodymium magnets.
Strengths
- They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
- Neodymium magnets are characterized by extremely resistant to loss of magnetic properties caused by external interference,
- A magnet with a shiny silver surface is more attractive,
- Magnetic induction on the working layer of the magnet is extremely intense,
- 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...
- Possibility of accurate modeling and adjusting to individual applications,
- Universal use in future technologies – they are used in magnetic memories, brushless drives, diagnostic systems, and complex engineering applications.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Weaknesses
- They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
- 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, as well as 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 when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- Limited possibility of creating nuts in the magnet and complex shapes - preferred is a housing - magnetic holder.
- Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
- With budget limitations the cost of neodymium magnets can be a barrier,
Pull force analysis
Detachment force of the magnet in optimal conditions – what contributes to it?
- on a plate made of mild steel, effectively closing the magnetic flux
- with a thickness minimum 10 mm
- with an ideally smooth touching surface
- under conditions of gap-free contact (surface-to-surface)
- under vertical force vector (90-degree angle)
- at conditions approx. 20°C
Practical aspects of lifting capacity – factors
- Space between magnet and steel – every 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 usually many times smaller (approx. 1/5 of the lifting capacity).
- Plate thickness – too thin steel does not accept the full field, causing part of the power to be wasted to the other side.
- Plate material – mild steel attracts best. Higher carbon content decrease magnetic properties and lifting capacity.
- Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
- Thermal factor – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity was determined by applying a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.
Eye protection
NdFeB magnets are ceramic materials, meaning they are very brittle. Collision of two magnets will cause them breaking into small pieces.
GPS Danger
Remember: neodymium magnets generate a field that confuses sensitive sensors. Maintain a separation from your mobile, tablet, and GPS.
Fire risk
Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.
Choking Hazard
Strictly store magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are life-threatening.
Warning for heart patients
Health Alert: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.
Avoid contact if allergic
Some people experience a contact allergy to Ni, which is the typical protective layer for neodymium magnets. Frequent touching might lead to skin redness. We strongly advise use protective gloves.
Do not overheat magnets
Do not overheat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, ask us about HT versions (H, SH, UH).
Serious injuries
Watch your fingers. Two large magnets will join instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!
Handling guide
Before use, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.
Data carriers
Avoid bringing magnets near a wallet, laptop, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.
