MP 10x6x4 / N38 - ring magnet
ring magnet
Catalog no 030179
GTIN/EAN: 5906301811961
Diameter
10 mm [±0,1 mm]
internal diameter Ø
6 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
1.51 g
Magnetization Direction
↑ axial
Load capacity
1.79 kg / 17.55 N
Magnetic Induction
386.91 mT / 3869 Gs
Coating
[NiCuNi] Nickel
0.898 ZŁ with VAT / pcs + price for transport
0.730 ZŁ net + 23% VAT / pcs
bulk discounts:
Need more?
Contact us by phone
+48 888 99 98 98
or send us a note via
our online form
through our site.
Specifications along with structure of neodymium magnets can be tested with our
our magnetic calculator.
Order by 14:00 and we’ll ship today!
Detailed specification - MP 10x6x4 / N38 - ring magnet
Specification / characteristics - MP 10x6x4 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030179 |
| GTIN/EAN | 5906301811961 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 10 mm [±0,1 mm] |
| internal diameter Ø | 6 mm [±0,1 mm] |
| Height | 4 mm [±0,1 mm] |
| Weight | 1.51 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.79 kg / 17.55 N |
| Magnetic Induction ~ ? | 386.91 mT / 3869 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 |
Engineering modeling of the product - report
The following information represent the result of a engineering calculation. Results were calculated on models for the material Nd2Fe14B. Actual performance might slightly differ from theoretical values. Treat these calculations as a preliminary roadmap for designers.
Table 1: Static pull force (force vs distance) - characteristics
MP 10x6x4 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6115 Gs
611.5 mT
|
1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
|
safe |
| 1 mm |
4915 Gs
491.5 mT
|
1.16 kg / 2.55 lbs
1156.7 g / 11.3 N
|
safe |
| 2 mm |
3833 Gs
383.3 mT
|
0.70 kg / 1.55 lbs
703.2 g / 6.9 N
|
safe |
| 3 mm |
2949 Gs
294.9 mT
|
0.42 kg / 0.92 lbs
416.3 g / 4.1 N
|
safe |
| 5 mm |
1761 Gs
176.1 mT
|
0.15 kg / 0.33 lbs
148.5 g / 1.5 N
|
safe |
| 10 mm |
612 Gs
61.2 mT
|
0.02 kg / 0.04 lbs
17.9 g / 0.2 N
|
safe |
| 15 mm |
284 Gs
28.4 mT
|
0.00 kg / 0.01 lbs
3.9 g / 0.0 N
|
safe |
| 20 mm |
157 Gs
15.7 mT
|
0.00 kg / 0.00 lbs
1.2 g / 0.0 N
|
safe |
| 30 mm |
64 Gs
6.4 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
safe |
| 50 mm |
19 Gs
1.9 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
Table 2: Slippage hold (wall)
MP 10x6x4 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.36 kg / 0.79 lbs
358.0 g / 3.5 N
|
| 1 mm | Stal (~0.2) |
0.23 kg / 0.51 lbs
232.0 g / 2.3 N
|
| 2 mm | Stal (~0.2) |
0.14 kg / 0.31 lbs
140.0 g / 1.4 N
|
| 3 mm | Stal (~0.2) |
0.08 kg / 0.19 lbs
84.0 g / 0.8 N
|
| 5 mm | Stal (~0.2) |
0.03 kg / 0.07 lbs
30.0 g / 0.3 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 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
MP 10x6x4 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.54 kg / 1.18 lbs
537.0 g / 5.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.36 kg / 0.79 lbs
358.0 g / 3.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.18 kg / 0.39 lbs
179.0 g / 1.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.90 kg / 1.97 lbs
895.0 g / 8.8 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MP 10x6x4 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.18 kg / 0.39 lbs
179.0 g / 1.8 N
|
| 1 mm |
|
0.45 kg / 0.99 lbs
447.5 g / 4.4 N
|
| 2 mm |
|
0.90 kg / 1.97 lbs
895.0 g / 8.8 N
|
| 3 mm |
|
1.34 kg / 2.96 lbs
1342.5 g / 13.2 N
|
| 5 mm |
|
1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
|
| 10 mm |
|
1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
|
| 11 mm |
|
1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
|
| 12 mm |
|
1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
|
Table 5: Thermal stability (stability) - resistance threshold
MP 10x6x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
|
OK |
| 40 °C | -2.2% |
1.75 kg / 3.86 lbs
1750.6 g / 17.2 N
|
OK |
| 60 °C | -4.4% |
1.71 kg / 3.77 lbs
1711.2 g / 16.8 N
|
OK |
| 80 °C | -6.6% |
1.67 kg / 3.69 lbs
1671.9 g / 16.4 N
|
|
| 100 °C | -28.8% |
1.27 kg / 2.81 lbs
1274.5 g / 12.5 N
|
Table 6: Two magnets (attraction) - field collision
MP 10x6x4 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
12.93 kg / 28.50 lbs
6 169 Gs
|
1.94 kg / 4.27 lbs
1939 g / 19.0 N
|
N/A |
| 1 mm |
10.50 kg / 23.16 lbs
11 025 Gs
|
1.58 kg / 3.47 lbs
1576 g / 15.5 N
|
9.45 kg / 20.84 lbs
~0 Gs
|
| 2 mm |
8.35 kg / 18.41 lbs
9 831 Gs
|
1.25 kg / 2.76 lbs
1253 g / 12.3 N
|
7.52 kg / 16.57 lbs
~0 Gs
|
| 3 mm |
6.55 kg / 14.43 lbs
8 703 Gs
|
0.98 kg / 2.17 lbs
982 g / 9.6 N
|
5.89 kg / 12.99 lbs
~0 Gs
|
| 5 mm |
3.91 kg / 8.63 lbs
6 729 Gs
|
0.59 kg / 1.29 lbs
587 g / 5.8 N
|
3.52 kg / 7.76 lbs
~0 Gs
|
| 10 mm |
1.07 kg / 2.36 lbs
3 522 Gs
|
0.16 kg / 0.35 lbs
161 g / 1.6 N
|
0.96 kg / 2.13 lbs
~0 Gs
|
| 20 mm |
0.13 kg / 0.29 lbs
1 223 Gs
|
0.02 kg / 0.04 lbs
19 g / 0.2 N
|
0.12 kg / 0.26 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 lbs
194 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
129 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
91 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
66 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
50 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
39 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Hazards (implants) - precautionary measures
MP 10x6x4 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 9.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 7.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 5.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 4.0 cm |
| Car key | 50 Gs (5.0 mT) | 3.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MP 10x6x4 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
34.94 km/h
(9.71 m/s)
|
0.07 J | |
| 30 mm |
60.15 km/h
(16.71 m/s)
|
0.21 J | |
| 50 mm |
77.64 km/h
(21.57 m/s)
|
0.35 J | |
| 100 mm |
109.80 km/h
(30.50 m/s)
|
0.70 J |
Table 9: Corrosion resistance
MP 10x6x4 / 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)
MP 10x6x4 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 4 017 Mx | 40.2 µWb |
| Pc Coefficient | 1.44 | High (Stable) |
Table 11: Physics of underwater searching
MP 10x6x4 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.79 kg | Standard |
| Water (riverbed) |
2.05 kg
(+0.26 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical wall, the magnet retains only approx. 20-30% of its perpendicular strength.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) significantly weakens the holding force.
3. Thermal stability
*For standard magnets, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.44
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.
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 |
Check out also products
Pros as well as cons of Nd2Fe14B magnets.
Benefits
- They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (according to literature),
- They retain their magnetic properties even under close interference source,
- By using a lustrous layer of silver, the element presents an proper look,
- The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
- Possibility of individual modeling as well as adapting to precise conditions,
- Huge importance in advanced technology sectors – they serve a role in HDD drives, electromotive mechanisms, diagnostic systems, as well as industrial machines.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Limitations
- They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
- Limited ability of making nuts in the magnet and complex forms - preferred is casing - magnet mounting.
- Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these devices are able to disrupt the diagnostic process medical when they are in the body.
- With large orders the cost of neodymium magnets can be a barrier,
Lifting parameters
Maximum lifting force for a neodymium magnet – what it depends on?
- with the application of a sheet made of special test steel, ensuring full magnetic saturation
- possessing a thickness of at least 10 mm to ensure full flux closure
- with a plane free of scratches
- under conditions of no distance (surface-to-surface)
- under vertical application of breakaway force (90-degree angle)
- in stable room temperature
Key elements affecting lifting force
- Distance – existence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
- Load vector – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
- Plate material – low-carbon steel attracts best. Alloy admixtures reduce magnetic permeability and lifting capacity.
- Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
- Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.
Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.
Safe handling of NdFeB magnets
Nickel allergy
Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness appears, cease working with magnets and use protective gear.
Do not drill into magnets
Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.
Physical harm
Big blocks can break fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.
Do not overheat magnets
Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and strength.
Risk of cracking
Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.
Respect the power
Handle magnets with awareness. Their powerful strength can shock even professionals. Be vigilant and respect their power.
ICD Warning
People with a heart stimulator have to keep an large gap from magnets. The magnetic field can disrupt the operation of the life-saving device.
Threat to navigation
Navigation devices and smartphones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.
Electronic hazard
Avoid bringing magnets close to a wallet, computer, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.
Keep away from children
Absolutely store magnets away from children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are life-threatening.
