MW 38x3.5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010062
GTIN/EAN: 5906301810612
Diameter Ø
38 mm [±0,1 mm]
Height
3.5 mm [±0,1 mm]
Weight
29.77 g
Magnetization Direction
↑ axial
Load capacity
5.09 kg / 49.91 N
Magnetic Induction
112.31 mT / 1123 Gs
Coating
[NiCuNi] Nickel
15.83 ZŁ with VAT / pcs + price for transport
12.87 ZŁ net + 23% VAT / pcs
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Technical of the product - MW 38x3.5 / N38 - cylindrical magnet
Specification / characteristics - MW 38x3.5 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010062 |
| GTIN/EAN | 5906301810612 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 38 mm [±0,1 mm] |
| Height | 3.5 mm [±0,1 mm] |
| Weight | 29.77 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 5.09 kg / 49.91 N |
| Magnetic Induction ~ ? | 112.31 mT / 1123 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 |
Technical simulation of the magnet - data
The following information constitute the outcome of a physical calculation. Results rely on models for the class Nd2Fe14B. Actual performance might slightly differ from theoretical values. Use these calculations as a preliminary roadmap when designing systems.
Table 1: Static force (force vs distance) - characteristics
MW 38x3.5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
1123 Gs
112.3 mT
|
5.09 kg / 5090.0 g
49.9 N
|
medium risk |
| 1 mm |
1103 Gs
110.3 mT
|
4.91 kg / 4910.1 g
48.2 N
|
medium risk |
| 2 mm |
1075 Gs
107.5 mT
|
4.66 kg / 4663.0 g
45.7 N
|
medium risk |
| 3 mm |
1040 Gs
104.0 mT
|
4.36 kg / 4364.2 g
42.8 N
|
medium risk |
| 5 mm |
954 Gs
95.4 mT
|
3.67 kg / 3673.1 g
36.0 N
|
medium risk |
| 10 mm |
703 Gs
70.3 mT
|
2.00 kg / 1997.1 g
19.6 N
|
low risk |
| 15 mm |
483 Gs
48.3 mT
|
0.94 kg / 943.2 g
9.3 N
|
low risk |
| 20 mm |
326 Gs
32.6 mT
|
0.43 kg / 429.7 g
4.2 N
|
low risk |
| 30 mm |
155 Gs
15.5 mT
|
0.10 kg / 97.1 g
1.0 N
|
low risk |
| 50 mm |
47 Gs
4.7 mT
|
0.01 kg / 8.9 g
0.1 N
|
low risk |
Table 2: Shear load (vertical surface)
MW 38x3.5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.02 kg / 1018.0 g
10.0 N
|
| 1 mm | Stal (~0.2) |
0.98 kg / 982.0 g
9.6 N
|
| 2 mm | Stal (~0.2) |
0.93 kg / 932.0 g
9.1 N
|
| 3 mm | Stal (~0.2) |
0.87 kg / 872.0 g
8.6 N
|
| 5 mm | Stal (~0.2) |
0.73 kg / 734.0 g
7.2 N
|
| 10 mm | Stal (~0.2) |
0.40 kg / 400.0 g
3.9 N
|
| 15 mm | Stal (~0.2) |
0.19 kg / 188.0 g
1.8 N
|
| 20 mm | Stal (~0.2) |
0.09 kg / 86.0 g
0.8 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 20.0 g
0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 2.0 g
0.0 N
|
Table 3: Vertical assembly (shearing) - vertical pull
MW 38x3.5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.53 kg / 1527.0 g
15.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.02 kg / 1018.0 g
10.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.51 kg / 509.0 g
5.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.55 kg / 2545.0 g
25.0 N
|
Table 4: Material efficiency (saturation) - power losses
MW 38x3.5 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
0.51 kg / 509.0 g
5.0 N
|
| 1 mm |
|
1.27 kg / 1272.5 g
12.5 N
|
| 2 mm |
|
2.55 kg / 2545.0 g
25.0 N
|
| 5 mm |
|
5.09 kg / 5090.0 g
49.9 N
|
| 10 mm |
|
5.09 kg / 5090.0 g
49.9 N
|
Table 5: Thermal resistance (stability) - resistance threshold
MW 38x3.5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
5.09 kg / 5090.0 g
49.9 N
|
OK |
| 40 °C | -2.2% |
4.98 kg / 4978.0 g
48.8 N
|
OK |
| 60 °C | -4.4% |
4.87 kg / 4866.0 g
47.7 N
|
|
| 80 °C | -6.6% |
4.75 kg / 4754.1 g
46.6 N
|
|
| 100 °C | -28.8% |
3.62 kg / 3624.1 g
35.6 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 38x3.5 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
8.82 kg / 8818 g
86.5 N
2 143 Gs
|
N/A |
| 1 mm |
8.68 kg / 8679 g
85.1 N
2 228 Gs
|
7.81 kg / 7811 g
76.6 N
~0 Gs
|
| 2 mm |
8.51 kg / 8507 g
83.5 N
2 206 Gs
|
7.66 kg / 7656 g
75.1 N
~0 Gs
|
| 3 mm |
8.31 kg / 8306 g
81.5 N
2 180 Gs
|
7.47 kg / 7475 g
73.3 N
~0 Gs
|
| 5 mm |
7.83 kg / 7829 g
76.8 N
2 116 Gs
|
7.05 kg / 7046 g
69.1 N
~0 Gs
|
| 10 mm |
6.36 kg / 6364 g
62.4 N
1 908 Gs
|
5.73 kg / 5727 g
56.2 N
~0 Gs
|
| 20 mm |
3.46 kg / 3460 g
33.9 N
1 407 Gs
|
3.11 kg / 3114 g
30.5 N
~0 Gs
|
| 50 mm |
0.35 kg / 346 g
3.4 N
445 Gs
|
0.31 kg / 312 g
3.1 N
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MW 38x3.5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 11.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 9.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 7.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 5.5 cm |
| Car key | 50 Gs (5.0 mT) | 5.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MW 38x3.5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
16.10 km/h
(4.47 m/s)
|
0.30 J | |
| 30 mm |
23.11 km/h
(6.42 m/s)
|
0.61 J | |
| 50 mm |
29.52 km/h
(8.20 m/s)
|
1.00 J | |
| 100 mm |
41.70 km/h
(11.58 m/s)
|
2.00 J |
Table 9: Anti-corrosion coating durability
MW 38x3.5 / 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 38x3.5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 17 022 Mx | 170.2 µWb |
| Pc Coefficient | 0.14 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MW 38x3.5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 5.09 kg | Standard |
| Water (riverbed) |
5.83 kg
(+0.74 kg Buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Note: On a vertical wall, the magnet holds just a fraction of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) significantly limits the holding force.
3. Heat tolerance
*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) = 0.14
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 |
See also products
Advantages and disadvantages of rare earth magnets.
Pros
- Their magnetic field is durable, and after around 10 years it drops only by ~1% (according to research),
- Magnets effectively defend themselves against loss of magnetization caused by ambient magnetic noise,
- The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to look better,
- Magnetic induction on the working layer of the magnet remains maximum,
- Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to versatility in shaping and the capacity to customize to client solutions,
- Universal use in innovative solutions – they are commonly used in HDD drives, electric motors, precision medical tools, as well as other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in miniature devices
Disadvantages
- Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Limited possibility of making threads in the magnet and complicated shapes - preferred is casing - magnet mounting.
- Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small components of these products are able to be problematic in diagnostics medical after entering the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities
Pull force analysis
Maximum magnetic pulling force – what contributes to it?
- on a base made of mild steel, perfectly concentrating the magnetic flux
- possessing a massiveness of at least 10 mm to avoid saturation
- with an polished contact surface
- with total lack of distance (no impurities)
- during pulling in a direction perpendicular to the plane
- at conditions approx. 20°C
Practical aspects of lifting capacity – factors
- Air gap (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
- Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
- Material type – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
- Base smoothness – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
- Thermal environment – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.
Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, in contrast under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet and the plate lowers the lifting capacity.
Safety rules for work with NdFeB magnets
Demagnetization risk
Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.
Eye protection
Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
Medical implants
Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.
Hand protection
Large magnets can crush fingers instantly. Do not put your hand between two strong magnets.
Magnetic interference
GPS units and smartphones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.
Caution required
Exercise caution. Neodymium magnets attract from a long distance and snap with huge force, often quicker than you can move away.
Warning for allergy sufferers
It is widely known that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, avoid touching magnets with bare hands or choose versions in plastic housing.
Keep away from children
NdFeB magnets are not suitable for play. Accidental ingestion of several magnets may result in them attracting across intestines, which constitutes a critical condition and requires immediate surgery.
Flammability
Powder created during machining of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.
Cards and drives
Intense magnetic fields can erase data on payment cards, hard drives, and storage devices. Stay away of min. 10 cm.
