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
Load capacity
0.74 kg / 7.27 N
Magnetic Induction
217.52 mT / 2175 Gs
Coating
[NiCuNi] Nickel
0.455 ZŁ with VAT / pcs + price for transport
0.370 ZŁ net + 23% VAT / pcs
bulk discounts:
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Physical properties - 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 |
|---|---|---|
| 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 assembly - report
The following information are the result of a engineering calculation. Values were calculated on models for the material Nd2Fe14B. Real-world conditions might slightly differ. Please consider these data as a preliminary roadmap during assembly planning.
Table 1: Static force (pull vs distance) - interaction chart
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 lbs
740.0 g / 7.3 N
|
weak grip |
| 1 mm |
1782 Gs
178.2 mT
|
0.50 kg / 1.10 lbs
497.3 g / 4.9 N
|
weak grip |
| 2 mm |
1310 Gs
131.0 mT
|
0.27 kg / 0.59 lbs
268.7 g / 2.6 N
|
weak grip |
| 3 mm |
914 Gs
91.4 mT
|
0.13 kg / 0.29 lbs
130.8 g / 1.3 N
|
weak grip |
| 5 mm |
439 Gs
43.9 mT
|
0.03 kg / 0.07 lbs
30.2 g / 0.3 N
|
weak grip |
| 10 mm |
99 Gs
9.9 mT
|
0.00 kg / 0.00 lbs
1.5 g / 0.0 N
|
weak grip |
| 15 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
weak grip |
| 20 mm |
16 Gs
1.6 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage load (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 lbs
148.0 g / 1.5 N
|
| 1 mm | Stal (~0.2) |
0.10 kg / 0.22 lbs
100.0 g / 1.0 N
|
| 2 mm | Stal (~0.2) |
0.05 kg / 0.12 lbs
54.0 g / 0.5 N
|
| 3 mm | Stal (~0.2) |
0.03 kg / 0.06 lbs
26.0 g / 0.3 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 0.01 lbs
6.0 g / 0.1 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 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 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 lbs
222.0 g / 2.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.15 kg / 0.33 lbs
148.0 g / 1.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.07 kg / 0.16 lbs
74.0 g / 0.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.37 kg / 0.82 lbs
370.0 g / 3.6 N
|
Table 4: Steel thickness (substrate influence) - power losses
MW 8x1.5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.07 kg / 0.16 lbs
74.0 g / 0.7 N
|
| 1 mm |
|
0.19 kg / 0.41 lbs
185.0 g / 1.8 N
|
| 2 mm |
|
0.37 kg / 0.82 lbs
370.0 g / 3.6 N
|
| 3 mm |
|
0.55 kg / 1.22 lbs
555.0 g / 5.4 N
|
| 5 mm |
|
0.74 kg / 1.63 lbs
740.0 g / 7.3 N
|
| 10 mm |
|
0.74 kg / 1.63 lbs
740.0 g / 7.3 N
|
| 11 mm |
|
0.74 kg / 1.63 lbs
740.0 g / 7.3 N
|
| 12 mm |
|
0.74 kg / 1.63 lbs
740.0 g / 7.3 N
|
Table 5: Thermal stability (stability) - resistance threshold
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 lbs
740.0 g / 7.3 N
|
OK |
| 40 °C | -2.2% |
0.72 kg / 1.60 lbs
723.7 g / 7.1 N
|
OK |
| 60 °C | -4.4% |
0.71 kg / 1.56 lbs
707.4 g / 6.9 N
|
|
| 80 °C | -6.6% |
0.69 kg / 1.52 lbs
691.2 g / 6.8 N
|
|
| 100 °C | -28.8% |
0.53 kg / 1.16 lbs
526.9 g / 5.2 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 8x1.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
1.46 kg / 3.23 lbs
3 712 Gs
|
0.22 kg / 0.48 lbs
220 g / 2.2 N
|
N/A |
| 1 mm |
1.24 kg / 2.74 lbs
4 007 Gs
|
0.19 kg / 0.41 lbs
187 g / 1.8 N
|
1.12 kg / 2.47 lbs
~0 Gs
|
| 2 mm |
0.98 kg / 2.17 lbs
3 565 Gs
|
0.15 kg / 0.33 lbs
148 g / 1.4 N
|
0.89 kg / 1.95 lbs
~0 Gs
|
| 3 mm |
0.74 kg / 1.63 lbs
3 086 Gs
|
0.11 kg / 0.24 lbs
111 g / 1.1 N
|
0.66 kg / 1.46 lbs
~0 Gs
|
| 5 mm |
0.37 kg / 0.82 lbs
2 196 Gs
|
0.06 kg / 0.12 lbs
56 g / 0.5 N
|
0.34 kg / 0.74 lbs
~0 Gs
|
| 10 mm |
0.06 kg / 0.13 lbs
878 Gs
|
0.01 kg / 0.02 lbs
9 g / 0.1 N
|
0.05 kg / 0.12 lbs
~0 Gs
|
| 20 mm |
0.00 kg / 0.01 lbs
199 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
17 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 lbs
10 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 lbs
6 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 lbs
4 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 lbs
3 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
2 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Protective zones (electronics) - warnings
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 |
| Mobile device | 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: Collisions (kinetic energy) - collision effects
MW 8x1.5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
36.39 km/h
(10.11 m/s)
|
0.03 J | |
| 30 mm |
62.94 km/h
(17.48 m/s)
|
0.09 J | |
| 50 mm |
81.25 km/h
(22.57 m/s)
|
0.15 J | |
| 100 mm |
114.91 km/h
(31.92 m/s)
|
0.29 J |
Table 9: Corrosion resistance
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: Electrical 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: Physics of underwater searching
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. Vertical hold
*Note: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.
3. Power loss vs temp
*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.
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 offers
Pros as well as cons of Nd2Fe14B magnets.
Benefits
- They do not lose power, even after nearly 10 years – the reduction in lifting capacity is only ~1% (theoretically),
- They retain their magnetic properties even under close interference source,
- By applying a lustrous coating of nickel, the element gains an aesthetic look,
- Magnetic induction on the working part of the magnet turns out to be very high,
- Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to flexibility in forming and the capacity to customize to specific needs,
- Significant place in modern technologies – they serve a role in data components, electric motors, precision medical tools, and multitasking production systems.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Weaknesses
- To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
- When exposed to high temperature, neodymium magnets suffer a drop in force. 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
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
- Due to limitations in realizing nuts and complicated forms in magnets, we propose using a housing - magnetic mechanism.
- Health risk to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. Furthermore, small components of these devices are able to be problematic in diagnostics medical after entering the body.
- With large orders the cost of neodymium magnets can be a barrier,
Holding force characteristics
Magnetic strength at its maximum – what contributes to it?
- with the contact of a sheet made of low-carbon steel, guaranteeing maximum field concentration
- with a cross-section of at least 10 mm
- with an ground touching surface
- with zero gap (without impurities)
- for force applied at a right angle (pull-off, not shear)
- at room temperature
Determinants of practical lifting force of a magnet
- Distance (betwixt the magnet and the metal), since even a very small distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
- Direction of force – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
- Plate thickness – insufficiently thick steel does not accept the full field, causing part of the power to be escaped to the other side.
- Material composition – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
- Base smoothness – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate decreases the load capacity.
H&S for magnets
Warning for allergy sufferers
Studies show that nickel (standard magnet coating) is a potent allergen. For allergy sufferers, refrain from touching magnets with bare hands or select encased magnets.
Phone sensors
Remember: neodymium magnets generate a field that disrupts sensitive sensors. Maintain a safe distance from your phone, tablet, and GPS.
Magnet fragility
Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.
Medical implants
Patients with a heart stimulator have to keep an large gap from magnets. The magnetism can disrupt the operation of the implant.
Respect the power
Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.
Heat sensitivity
Do not overheat. NdFeB magnets are sensitive to heat. If you need resistance above 80°C, look for HT versions (H, SH, UH).
This is not a toy
Only for adults. Small elements can be swallowed, leading to intestinal necrosis. Store out of reach of kids and pets.
Bodily injuries
Pinching hazard: The pulling power is so great that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.
Dust explosion hazard
Powder created during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.
Cards and drives
Avoid bringing magnets close to a purse, computer, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.
