MP 10x7/3.5x3 / N38 - ring magnet
ring magnet
Catalog no 030180
GTIN/EAN: 5906301811978
Diameter
10 mm [±0,1 mm]
internal diameter Ø
7/3.5 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
1.55 g
Magnetization Direction
↑ axial
Load capacity
1.88 kg / 18.47 N
Magnetic Induction
318.70 mT / 3187 Gs
Coating
[NiCuNi] Nickel
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Technical - MP 10x7/3.5x3 / N38 - ring magnet
Specification / characteristics - MP 10x7/3.5x3 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030180 |
| GTIN/EAN | 5906301811978 |
| 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 | 7/3.5 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 1.55 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.88 kg / 18.47 N |
| Magnetic Induction ~ ? | 318.70 mT / 3187 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 assembly - technical parameters
Presented data represent the outcome of a mathematical calculation. Values rely on models for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Please consider these data as a reference point when designing systems.
Table 1: Static force (force vs distance) - interaction chart
MP 10x7/3.5x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2813 Gs
281.3 mT
|
1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
|
safe |
| 1 mm |
2373 Gs
237.3 mT
|
1.34 kg / 2.95 LBS
1338.1 g / 13.1 N
|
safe |
| 2 mm |
1870 Gs
187.0 mT
|
0.83 kg / 1.83 LBS
830.9 g / 8.2 N
|
safe |
| 3 mm |
1416 Gs
141.6 mT
|
0.48 kg / 1.05 LBS
476.6 g / 4.7 N
|
safe |
| 5 mm |
785 Gs
78.5 mT
|
0.15 kg / 0.32 LBS
146.4 g / 1.4 N
|
safe |
| 10 mm |
214 Gs
21.4 mT
|
0.01 kg / 0.02 LBS
10.9 g / 0.1 N
|
safe |
| 15 mm |
81 Gs
8.1 mT
|
0.00 kg / 0.00 LBS
1.6 g / 0.0 N
|
safe |
| 20 mm |
38 Gs
3.8 mT
|
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
|
safe |
| 30 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
| 50 mm |
3 Gs
0.3 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
Table 2: Slippage force (vertical surface)
MP 10x7/3.5x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.38 kg / 0.83 LBS
376.0 g / 3.7 N
|
| 1 mm | Stal (~0.2) |
0.27 kg / 0.59 LBS
268.0 g / 2.6 N
|
| 2 mm | Stal (~0.2) |
0.17 kg / 0.37 LBS
166.0 g / 1.6 N
|
| 3 mm | Stal (~0.2) |
0.10 kg / 0.21 LBS
96.0 g / 0.9 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 / 0.00 LBS
2.0 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) - behavior on slippery surfaces
MP 10x7/3.5x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.56 kg / 1.24 LBS
564.0 g / 5.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.38 kg / 0.83 LBS
376.0 g / 3.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.19 kg / 0.41 LBS
188.0 g / 1.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.94 kg / 2.07 LBS
940.0 g / 9.2 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MP 10x7/3.5x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.19 kg / 0.41 LBS
188.0 g / 1.8 N
|
| 1 mm |
|
0.47 kg / 1.04 LBS
470.0 g / 4.6 N
|
| 2 mm |
|
0.94 kg / 2.07 LBS
940.0 g / 9.2 N
|
| 3 mm |
|
1.41 kg / 3.11 LBS
1410.0 g / 13.8 N
|
| 5 mm |
|
1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
|
| 10 mm |
|
1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
|
| 11 mm |
|
1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
|
| 12 mm |
|
1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
|
Table 5: Thermal stability (stability) - thermal limit
MP 10x7/3.5x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
|
OK |
| 40 °C | -2.2% |
1.84 kg / 4.05 LBS
1838.6 g / 18.0 N
|
OK |
| 60 °C | -4.4% |
1.80 kg / 3.96 LBS
1797.3 g / 17.6 N
|
|
| 80 °C | -6.6% |
1.76 kg / 3.87 LBS
1755.9 g / 17.2 N
|
|
| 100 °C | -28.8% |
1.34 kg / 2.95 LBS
1338.6 g / 13.1 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 10x7/3.5x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.86 kg / 6.30 LBS
4 419 Gs
|
0.43 kg / 0.95 LBS
429 g / 4.2 N
|
N/A |
| 1 mm |
2.46 kg / 5.43 LBS
5 224 Gs
|
0.37 kg / 0.81 LBS
370 g / 3.6 N
|
2.22 kg / 4.89 LBS
~0 Gs
|
| 2 mm |
2.03 kg / 4.49 LBS
4 747 Gs
|
0.31 kg / 0.67 LBS
305 g / 3.0 N
|
1.83 kg / 4.04 LBS
~0 Gs
|
| 3 mm |
1.62 kg / 3.58 LBS
4 242 Gs
|
0.24 kg / 0.54 LBS
244 g / 2.4 N
|
1.46 kg / 3.22 LBS
~0 Gs
|
| 5 mm |
0.96 kg / 2.12 LBS
3 266 Gs
|
0.14 kg / 0.32 LBS
144 g / 1.4 N
|
0.87 kg / 1.91 LBS
~0 Gs
|
| 10 mm |
0.22 kg / 0.49 LBS
1 570 Gs
|
0.03 kg / 0.07 LBS
33 g / 0.3 N
|
0.20 kg / 0.44 LBS
~0 Gs
|
| 20 mm |
0.02 kg / 0.04 LBS
429 Gs
|
0.00 kg / 0.01 LBS
2 g / 0.0 N
|
0.01 kg / 0.03 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
41 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
25 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
16 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
11 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
8 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
6 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Protective zones (implants) - warnings
MP 10x7/3.5x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 4.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 3.0 cm |
| Phone / Smartphone | 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: Dynamics (kinetic energy) - collision effects
MP 10x7/3.5x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
35.25 km/h
(9.79 m/s)
|
0.07 J | |
| 30 mm |
60.84 km/h
(16.90 m/s)
|
0.22 J | |
| 50 mm |
78.54 km/h
(21.82 m/s)
|
0.37 J | |
| 100 mm |
111.07 km/h
(30.85 m/s)
|
0.74 J |
Table 9: Corrosion resistance
MP 10x7/3.5x3 / 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 10x7/3.5x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 899 Mx | 19.0 µWb |
| Pc Coefficient | 0.37 | Low (Flat) |
Table 11: Submerged application
MP 10x7/3.5x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.88 kg | Standard |
| Water (riverbed) |
2.15 kg
(+0.27 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Note: On a vertical wall, the magnet retains only a fraction of its perpendicular strength.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) severely reduces the holding force.
3. Heat tolerance
*For N38 material, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.37
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Strengths as well as weaknesses of neodymium magnets.
Advantages
- They retain attractive force for almost ten years – the drop is just ~1% (according to analyses),
- Magnets effectively resist against demagnetization caused by ambient magnetic noise,
- The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- They feature high magnetic induction at the operating surface, which improves attraction properties,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Possibility of accurate shaping as well as adapting to defined conditions,
- Fundamental importance in future technologies – they serve a role in computer drives, electromotive mechanisms, precision medical tools, also multitasking production systems.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Weaknesses
- At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
- NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
- Due to limitations in creating nuts and complicated shapes in magnets, we propose using a housing - magnetic holder.
- Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. Additionally, tiny parts of these magnets are able to 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 lifting force for a neodymium magnet – what it depends on?
- on a base made of structural steel, perfectly concentrating the magnetic field
- possessing a thickness of min. 10 mm to ensure full flux closure
- characterized by even structure
- under conditions of ideal adhesion (metal-to-metal)
- for force acting at a right angle (in the magnet axis)
- at temperature approx. 20 degrees Celsius
Determinants of practical lifting force of a magnet
- Gap between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
- Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Steel grade – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
- Base smoothness – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
- Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.
Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, in contrast under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.
Warnings
ICD Warning
Patients with a heart stimulator have to keep an absolute distance from magnets. The magnetism can disrupt the operation of the implant.
Power loss in heat
Keep cool. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).
Electronic devices
Do not bring magnets close to a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.
Protective goggles
Beware of splinters. Magnets can explode upon violent connection, launching sharp fragments into the air. We recommend safety glasses.
Bodily injuries
Large magnets can crush fingers instantly. Do not put your hand betwixt two strong magnets.
No play value
Strictly store magnets away from children. Choking hazard is significant, and the effects of magnets clamping inside the body are tragic.
Keep away from electronics
Note: neodymium magnets generate a field that confuses precision electronics. Keep a separation from your mobile, device, and navigation systems.
Sensitization to coating
Studies show that nickel (the usual finish) is a common allergen. If you have an allergy, refrain from touching magnets with bare hands and choose coated magnets.
Dust is flammable
Dust produced during grinding of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.
Do not underestimate power
Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.
