MW 8x1.5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010101
GTIN/EAN: 5906301811008
- Diameter Ø
- 8 mm [±0,1 mm]
- Height
- 1.5 mm [±0,1 mm]
- Weight
- 0.57 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
0.370 zł net / pcs
0.455 zł with VAT (23% VAT) / pcs
bulk discounts:
Need more?Frequently asked questions
What is the maximum working temperature of a disc magnet?
What is the difference between N38, N42 and N52?
What is the dimensional tolerance?
Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Technical data of the product - MW 8x1.5 / N38 - cylindrical magnet
Specification / characteristics - MW 8x1.5 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010101 |
| GTIN/EAN | 5906301811008 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 1.5 mm [±0,1 mm] |
| Weight | 0.57 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.74 kg / 7.27 N |
| Magnetic Induction ~ ? | 217.52 mT / 2175 Gs |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±0.1 mm |
Magnetic properties of material N38
| properties | values | units |
|---|---|---|
| Remanence Br ? | 12.2-12.6 | kGs |
| Remanence Br ? | 1220-1260 | mT |
| Coercivity bHc ? | 10.8-11.5 | kOe |
| Coercivity bHc ? | 860-915 | kA/m |
| Intrinsic coercivity iHc | ≥ 12 | kOe |
| Intrinsic coercivity iHc | ≥ 955 | kA/m |
| Energy product BHmax ? | 36-38 | BH max MGOe |
| Energy product BHmax ? | 287-303 | BH max KJ/m |
| Maximum working 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 assembly - data
These values are the direct effect of a physical calculation. Values rely on algorithms for the material Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Please consider these calculations as a reference point for designers.
Table 1: Static pull force (pull vs gap) - power drop
MW 8x1.5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2174 Gs
217.4 mT
|
0.74 kg / 1.63 pounds
740.0 g / 7.3 N
|
weak grip |
| 1 mm |
1782 Gs
178.2 mT
|
0.50 kg / 1.10 pounds
497.3 g / 4.9 N
|
weak grip |
| 2 mm |
1310 Gs
131.0 mT
|
0.27 kg / 0.59 pounds
268.7 g / 2.6 N
|
weak grip |
| 3 mm |
914 Gs
91.4 mT
|
0.13 kg / 0.29 pounds
130.8 g / 1.3 N
|
weak grip |
| 5 mm |
439 Gs
43.9 mT
|
0.03 kg / 0.07 pounds
30.2 g / 0.3 N
|
weak grip |
| 10 mm |
99 Gs
9.9 mT
|
0.00 kg / 0.00 pounds
1.5 g / 0.0 N
|
weak grip |
| 15 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
weak grip |
| 20 mm |
16 Gs
1.6 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage force (vertical surface)
MW 8x1.5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.15 kg / 0.33 pounds
148.0 g / 1.5 N
|
| 1 mm | Stal (~0.2) |
0.10 kg / 0.22 pounds
100.0 g / 1.0 N
|
| 2 mm | Stal (~0.2) |
0.05 kg / 0.12 pounds
54.0 g / 0.5 N
|
| 3 mm | Stal (~0.2) |
0.03 kg / 0.06 pounds
26.0 g / 0.3 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 8x1.5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.22 kg / 0.49 pounds
222.0 g / 2.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.15 kg / 0.33 pounds
148.0 g / 1.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.07 kg / 0.16 pounds
74.0 g / 0.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.37 kg / 0.82 pounds
370.0 g / 3.6 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MW 8x1.5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.07 kg / 0.16 pounds
74.0 g / 0.7 N
|
| 1 mm |
|
0.19 kg / 0.41 pounds
185.0 g / 1.8 N
|
| 2 mm |
|
0.37 kg / 0.82 pounds
370.0 g / 3.6 N
|
| 3 mm |
|
0.55 kg / 1.22 pounds
555.0 g / 5.4 N
|
| 5 mm |
|
0.74 kg / 1.63 pounds
740.0 g / 7.3 N
|
| 10 mm |
|
0.74 kg / 1.63 pounds
740.0 g / 7.3 N
|
| 11 mm |
|
0.74 kg / 1.63 pounds
740.0 g / 7.3 N
|
| 12 mm |
|
0.74 kg / 1.63 pounds
740.0 g / 7.3 N
|
Table 5: Working in heat (material behavior) - thermal limit
MW 8x1.5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.74 kg / 1.63 pounds
740.0 g / 7.3 N
|
OK |
| 40 °C | -2.2% |
0.72 kg / 1.60 pounds
723.7 g / 7.1 N
|
OK |
| 60 °C | -4.4% |
0.71 kg / 1.56 pounds
707.4 g / 6.9 N
|
|
| 80 °C | -6.6% |
0.69 kg / 1.52 pounds
691.2 g / 6.8 N
|
|
| 100 °C | -28.8% |
0.53 kg / 1.16 pounds
526.9 g / 5.2 N
|
Table 6: Two magnets (repulsion) - forces in the system
MW 8x1.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
1.46 kg / 3.23 pounds
3 712 Gs
|
0.22 kg / 0.48 pounds
220 g / 2.2 N
|
N/A |
| 1 mm |
1.24 kg / 2.74 pounds
4 007 Gs
|
0.19 kg / 0.41 pounds
187 g / 1.8 N
|
1.12 kg / 2.47 pounds
~0 Gs
|
| 2 mm |
0.98 kg / 2.17 pounds
3 565 Gs
|
0.15 kg / 0.33 pounds
148 g / 1.4 N
|
0.89 kg / 1.95 pounds
~0 Gs
|
| 3 mm |
0.74 kg / 1.63 pounds
3 086 Gs
|
0.11 kg / 0.24 pounds
111 g / 1.1 N
|
0.66 kg / 1.46 pounds
~0 Gs
|
| 5 mm |
0.37 kg / 0.82 pounds
2 196 Gs
|
0.06 kg / 0.12 pounds
56 g / 0.5 N
|
0.34 kg / 0.74 pounds
~0 Gs
|
| 10 mm |
0.06 kg / 0.13 pounds
878 Gs
|
0.01 kg / 0.02 pounds
9 g / 0.1 N
|
0.05 kg / 0.12 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.01 pounds
199 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
17 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
10 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
6 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
4 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
3 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
2 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MW 8x1.5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 1.5 cm |
| Remote | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Dynamics (cracking risk) - collision effects
MW 8x1.5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
24.77 km/h
(6.88 m/s)
|
0.01 J | |
| 30 mm |
24.80 km/h
(6.89 m/s)
|
0.01 J | |
| 50 mm |
24.80 km/h
(6.89 m/s)
|
0.01 J | |
| 100 mm |
24.80 km/h
(6.89 m/s)
|
0.01 J |
Table 9: Surface protection spec
MW 8x1.5 / 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 (Pc)
MW 8x1.5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 285 Mx | 12.9 µWb |
| Pc Coefficient | 0.27 | Low (Flat) |
Table 11: Submerged application
MW 8x1.5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.74 kg | Standard |
| Water (riverbed) |
0.85 kg
(+0.11 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Caution: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Thermal stability
*For N38 grade, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.27
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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other deals
Advantages and disadvantages of rare earth magnets.
Benefits
- Their power remains stable, and after approximately 10 years it drops only by ~1% (theoretically),
- They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
- Thanks to the metallic finish, the coating of Ni-Cu-Ni, gold, or silver-plated gives an clean appearance,
- Neodymium magnets achieve maximum magnetic induction on a small area, which increases force concentration,
- 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...
- Thanks to freedom in forming and the capacity to adapt to individual projects,
- Significant place in modern industrial fields – they are used in mass storage devices, motor assemblies, medical equipment, also technologically advanced constructions.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Weaknesses
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
- 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.
- They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing nuts and complicated forms in magnets, we propose using a housing - magnetic holder.
- Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, small elements of these products can be problematic in diagnostics medical after entering the body.
- With large orders the cost of neodymium magnets can be a barrier,
Pull force analysis
Maximum holding power of the magnet – what it depends on?
- with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
- with a cross-section of at least 10 mm
- with a plane cleaned and smooth
- with direct contact (no impurities)
- for force applied at a right angle (pull-off, not shear)
- in stable room temperature
Determinants of lifting force in real conditions
- Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
- Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
- Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
- Plate material – mild steel gives the best results. Higher carbon content reduce magnetic properties and lifting capacity.
- Plate texture – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
- Thermal environment – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.
Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet and the plate decreases the lifting capacity.
Precautions when working with NdFeB magnets
Health Danger
People with a heart stimulator must keep an large gap from magnets. The magnetism can interfere with the operation of the implant.
Hand protection
Protect your hands. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Be careful!
Permanent damage
Regular neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. This process is irreversible.
Safe operation
Be careful. Rare earth magnets act from a long distance and snap with massive power, often quicker than you can move away.
Allergy Warning
Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation happens, cease working with magnets and wear gloves.
Threat to electronics
Do not bring magnets near a purse, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.
Danger to the youngest
Product intended for adults. Small elements pose a choking risk, causing serious injuries. Keep out of reach of kids and pets.
Eye protection
Neodymium magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets leads to them cracking into small pieces.
Threat to navigation
Note: neodymium magnets generate a field that disrupts precision electronics. Maintain a separation from your phone, tablet, and GPS.
Flammability
Fire hazard: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.
