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
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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 analysis of the product - data
The following values are the outcome of a physical calculation. Results are based on models for the class Nd2Fe14B. Operational performance might slightly differ from theoretical values. Use these calculations as a preliminary roadmap during assembly planning.
Table 1: Static force (force vs gap) - characteristics
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
|
low risk |
| 1 mm |
1782 Gs
178.2 mT
|
0.50 kg / 1.10 LBS
497.3 g / 4.9 N
|
low risk |
| 2 mm |
1310 Gs
131.0 mT
|
0.27 kg / 0.59 LBS
268.7 g / 2.6 N
|
low risk |
| 3 mm |
914 Gs
91.4 mT
|
0.13 kg / 0.29 LBS
130.8 g / 1.3 N
|
low risk |
| 5 mm |
439 Gs
43.9 mT
|
0.03 kg / 0.07 LBS
30.2 g / 0.3 N
|
low risk |
| 10 mm |
99 Gs
9.9 mT
|
0.00 kg / 0.00 LBS
1.5 g / 0.0 N
|
low risk |
| 15 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
|
low risk |
| 20 mm |
16 Gs
1.6 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 30 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Sliding load (wall)
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: Vertical assembly (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 (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 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 resistance (material behavior) - power drop
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: Two magnets (attraction) - field range
MW 8x1.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (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) - 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 |
| Mobile device | 40 Gs (4.0 mT) | 1.5 cm |
| Car key | 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 (kinetic energy) - warning
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: Coating parameters (durability)
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: 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. Wall mount (shear)
*Warning: On a vertical surface, the magnet retains merely a fraction of its max power.
2. Plate thickness effect
*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.
3. Power loss vs temp
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.27
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.
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 |
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Strengths and weaknesses of Nd2Fe14B magnets.
Strengths
- Their power is maintained, and after around 10 years it decreases only by ~1% (according to research),
- Neodymium magnets are distinguished by remarkably resistant to demagnetization caused by external field sources,
- A magnet with a metallic nickel surface has an effective appearance,
- They are known for high magnetic induction at the operating surface, which increases their power,
- 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 ability to customize to client solutions,
- Huge importance in future technologies – they find application in computer drives, electric drive systems, diagnostic systems, also other advanced devices.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Disadvantages
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also raises their 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, as well as 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 suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- Limited possibility of creating nuts in the magnet and complex forms - preferred is casing - mounting mechanism.
- Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small components of these magnets can be problematic in diagnostics medical when they are in the body.
- With budget limitations the cost of neodymium magnets is economically unviable,
Lifting parameters
Maximum lifting force for a neodymium magnet – what contributes to it?
- using a plate made of low-carbon steel, acting as a magnetic yoke
- with a cross-section minimum 10 mm
- characterized by smoothness
- without any clearance between the magnet and steel
- for force acting at a right angle (in the magnet axis)
- at temperature room level
Lifting capacity in real conditions – factors
- Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
- Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
- Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
- Material composition – different alloys attracts identically. High carbon content weaken the attraction effect.
- Plate texture – ground elements guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
- Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.
Lifting capacity was assessed using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate decreases the lifting capacity.
H&S for magnets
Cards and drives
Equipment safety: Neodymium magnets can damage data carriers and sensitive devices (heart implants, medical aids, mechanical watches).
Magnet fragility
Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets leads to them breaking into shards.
Medical implants
People with a pacemaker should maintain an large gap from magnets. The magnetism can disrupt the operation of the life-saving device.
This is not a toy
Only for adults. Small elements can be swallowed, causing intestinal necrosis. Store out of reach of kids and pets.
Bone fractures
Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!
Dust is flammable
Dust generated during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
Heat warning
Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.
Handling rules
Before use, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.
Nickel coating and allergies
Medical facts indicate that the nickel plating (the usual finish) is a strong allergen. For allergy sufferers, refrain from direct skin contact and opt for encased magnets.
Keep away from electronics
Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a strong magnet can ruin the internal compass in your phone.
