MP 8x6/3.5x3 / N38 - ring magnet
ring magnet
Catalog no 030206
GTIN/EAN: 5906301812234
Diameter
8 mm [±0,1 mm]
internal diameter Ø
6/3.5 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
0.91 g
Magnetization Direction
↑ axial
Load capacity
1.37 kg / 13.48 N
Magnetic Induction
371.53 mT / 3715 Gs
Coating
[NiCuNi] Nickel
0.701 ZŁ with VAT / pcs + price for transport
0.570 ZŁ net + 23% VAT / pcs
bulk discounts:
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Physical properties - MP 8x6/3.5x3 / N38 - ring magnet
Specification / characteristics - MP 8x6/3.5x3 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030206 |
| GTIN/EAN | 5906301812234 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 8 mm [±0,1 mm] |
| internal diameter Ø | 6/3.5 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 0.91 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.37 kg / 13.48 N |
| Magnetic Induction ~ ? | 371.53 mT / 3715 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 product - technical parameters
These values constitute the direct effect of a mathematical simulation. Values are based on algorithms for the class Nd2Fe14B. Operational performance may differ from theoretical values. Treat these data as a reference point when designing systems.
Table 1: Static force (pull vs distance) - interaction chart
MP 8x6/3.5x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3327 Gs
332.7 mT
|
1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
|
safe |
| 1 mm |
2612 Gs
261.2 mT
|
0.84 kg / 1.86 pounds
844.4 g / 8.3 N
|
safe |
| 2 mm |
1884 Gs
188.4 mT
|
0.44 kg / 0.97 pounds
439.3 g / 4.3 N
|
safe |
| 3 mm |
1310 Gs
131.0 mT
|
0.21 kg / 0.47 pounds
212.4 g / 2.1 N
|
safe |
| 5 mm |
637 Gs
63.7 mT
|
0.05 kg / 0.11 pounds
50.3 g / 0.5 N
|
safe |
| 10 mm |
151 Gs
15.1 mT
|
0.00 kg / 0.01 pounds
2.8 g / 0.0 N
|
safe |
| 15 mm |
54 Gs
5.4 mT
|
0.00 kg / 0.00 pounds
0.4 g / 0.0 N
|
safe |
| 20 mm |
25 Gs
2.5 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
safe |
| 30 mm |
8 Gs
0.8 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Sliding load (vertical surface)
MP 8x6/3.5x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.27 kg / 0.60 pounds
274.0 g / 2.7 N
|
| 1 mm | Stal (~0.2) |
0.17 kg / 0.37 pounds
168.0 g / 1.6 N
|
| 2 mm | Stal (~0.2) |
0.09 kg / 0.19 pounds
88.0 g / 0.9 N
|
| 3 mm | Stal (~0.2) |
0.04 kg / 0.09 pounds
42.0 g / 0.4 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 0.02 pounds
10.0 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) - vertical pull
MP 8x6/3.5x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.41 kg / 0.91 pounds
411.0 g / 4.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.27 kg / 0.60 pounds
274.0 g / 2.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.14 kg / 0.30 pounds
137.0 g / 1.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.69 kg / 1.51 pounds
685.0 g / 6.7 N
|
Table 4: Material efficiency (saturation) - power losses
MP 8x6/3.5x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.14 kg / 0.30 pounds
137.0 g / 1.3 N
|
| 1 mm |
|
0.34 kg / 0.76 pounds
342.5 g / 3.4 N
|
| 2 mm |
|
0.69 kg / 1.51 pounds
685.0 g / 6.7 N
|
| 3 mm |
|
1.03 kg / 2.27 pounds
1027.5 g / 10.1 N
|
| 5 mm |
|
1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
|
| 10 mm |
|
1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
|
| 11 mm |
|
1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
|
| 12 mm |
|
1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
|
Table 5: Thermal resistance (stability) - power drop
MP 8x6/3.5x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
|
OK |
| 40 °C | -2.2% |
1.34 kg / 2.95 pounds
1339.9 g / 13.1 N
|
OK |
| 60 °C | -4.4% |
1.31 kg / 2.89 pounds
1309.7 g / 12.8 N
|
|
| 80 °C | -6.6% |
1.28 kg / 2.82 pounds
1279.6 g / 12.6 N
|
|
| 100 °C | -28.8% |
0.98 kg / 2.15 pounds
975.4 g / 9.6 N
|
Table 6: Two magnets (attraction) - field collision
MP 8x6/3.5x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.36 kg / 5.20 pounds
4 867 Gs
|
0.35 kg / 0.78 pounds
354 g / 3.5 N
|
N/A |
| 1 mm |
1.90 kg / 4.20 pounds
5 981 Gs
|
0.29 kg / 0.63 pounds
286 g / 2.8 N
|
1.71 kg / 3.78 pounds
~0 Gs
|
| 2 mm |
1.45 kg / 3.20 pounds
5 223 Gs
|
0.22 kg / 0.48 pounds
218 g / 2.1 N
|
1.31 kg / 2.88 pounds
~0 Gs
|
| 3 mm |
1.06 kg / 2.34 pounds
4 468 Gs
|
0.16 kg / 0.35 pounds
159 g / 1.6 N
|
0.96 kg / 2.11 pounds
~0 Gs
|
| 5 mm |
0.53 kg / 1.16 pounds
3 148 Gs
|
0.08 kg / 0.17 pounds
79 g / 0.8 N
|
0.47 kg / 1.05 pounds
~0 Gs
|
| 10 mm |
0.09 kg / 0.19 pounds
1 274 Gs
|
0.01 kg / 0.03 pounds
13 g / 0.1 N
|
0.08 kg / 0.17 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.01 pounds
301 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
27 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
16 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
10 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
7 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
5 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
4 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
MP 8x6/3.5x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 4.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.0 cm |
| Car key | 50 Gs (5.0 mT) | 2.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MP 8x6/3.5x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
39.18 km/h
(10.88 m/s)
|
0.05 J | |
| 30 mm |
67.78 km/h
(18.83 m/s)
|
0.16 J | |
| 50 mm |
87.50 km/h
(24.31 m/s)
|
0.27 J | |
| 100 mm |
123.74 km/h
(34.37 m/s)
|
0.54 J |
Table 9: Surface protection spec
MP 8x6/3.5x3 / 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 (Flux)
MP 8x6/3.5x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 299 Mx | 13.0 µWb |
| Pc Coefficient | 0.46 | Low (Flat) |
Table 11: Submerged application
MP 8x6/3.5x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.37 kg | Standard |
| Water (riverbed) |
1.57 kg
(+0.20 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical surface, the magnet retains merely ~20% of its max power.
2. Steel thickness impact
*Thin steel (e.g. computer case) significantly limits the holding force.
3. Thermal stability
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.46
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.
Material specification
| 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 |
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Strengths and weaknesses of neodymium magnets.
Benefits
- They retain magnetic properties for almost 10 years – the loss is just ~1% (according to analyses),
- Neodymium magnets are exceptionally resistant to loss of magnetic properties caused by magnetic disturbances,
- The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to look better,
- The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Possibility of exact modeling and adjusting to defined needs,
- Versatile presence in high-tech industry – they are used in computer drives, motor assemblies, advanced medical instruments, also industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in miniature devices
Disadvantages
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
- When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power 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 start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
- Limited ability of creating threads in the magnet and complicated shapes - recommended is cover - magnet mounting.
- Health risk related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these devices can disrupt the diagnostic process medical in case of swallowing.
- 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
Optimal lifting capacity of a neodymium magnet – what it depends on?
- with the contact of a yoke made of low-carbon steel, ensuring maximum field concentration
- with a cross-section of at least 10 mm
- with an ground contact surface
- under conditions of ideal adhesion (metal-to-metal)
- under vertical application of breakaway force (90-degree angle)
- at conditions approx. 20°C
Determinants of practical lifting force of a magnet
- Clearance – the presence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
- Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Steel thickness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be wasted to the other side.
- Steel type – low-carbon steel gives the best results. Alloy admixtures decrease magnetic properties and lifting capacity.
- Smoothness – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
- Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity was measured by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate decreases the lifting capacity.
Safe handling of NdFeB magnets
Fire warning
Fire warning: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.
Hand protection
Danger of trauma: The attraction force is so immense that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.
Handling guide
Before starting, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.
Precision electronics
Navigation devices and mobile phones are highly sensitive to magnetism. Direct contact with a strong magnet can permanently damage the internal compass in your phone.
Allergic reactions
Studies show that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, avoid touching magnets with bare hands or choose versions in plastic housing.
Data carriers
Avoid bringing magnets close to a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.
Protective goggles
Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.
Do not overheat magnets
Keep cool. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).
Implant safety
Life threat: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.
Danger to the youngest
These products are not intended for children. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates immediate surgery.
