MP 5x1.5x3 / N38 - ring magnet
ring magnet
Catalog no 030451
GTIN/EAN: 5906301812357
Diameter
5 mm [±0,1 mm]
internal diameter Ø
1.5 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
0.4 g
Magnetization Direction
↑ axial
Load capacity
0.77 kg / 7.50 N
Magnetic Induction
475.16 mT / 4752 Gs
Coating
[NiCuNi] Nickel
0.344 ZŁ with VAT / pcs + price for transport
0.280 ZŁ net + 23% VAT / pcs
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Technical specification of the product - MP 5x1.5x3 / N38 - ring magnet
Specification / characteristics - MP 5x1.5x3 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030451 |
| GTIN/EAN | 5906301812357 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 5 mm [±0,1 mm] |
| internal diameter Ø | 1.5 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 0.4 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.77 kg / 7.50 N |
| Magnetic Induction ~ ? | 475.16 mT / 4752 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 assembly - report
The following values constitute the outcome of a engineering analysis. Values were calculated on algorithms for the material Nd2Fe14B. Operational conditions might slightly differ. Please consider these data as a reference point when designing systems.
Table 1: Static pull force (force vs distance) - interaction chart
MP 5x1.5x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6157 Gs
615.7 mT
|
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
|
safe |
| 1 mm |
3880 Gs
388.0 mT
|
0.31 kg / 0.67 pounds
305.8 g / 3.0 N
|
safe |
| 2 mm |
2310 Gs
231.0 mT
|
0.11 kg / 0.24 pounds
108.4 g / 1.1 N
|
safe |
| 3 mm |
1422 Gs
142.2 mT
|
0.04 kg / 0.09 pounds
41.0 g / 0.4 N
|
safe |
| 5 mm |
641 Gs
64.1 mT
|
0.01 kg / 0.02 pounds
8.3 g / 0.1 N
|
safe |
| 10 mm |
174 Gs
17.4 mT
|
0.00 kg / 0.00 pounds
0.6 g / 0.0 N
|
safe |
| 15 mm |
76 Gs
7.6 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
safe |
| 20 mm |
41 Gs
4.1 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 30 mm |
16 Gs
1.6 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 50 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Shear hold (vertical surface)
MP 5x1.5x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.15 kg / 0.34 pounds
154.0 g / 1.5 N
|
| 1 mm | Stal (~0.2) |
0.06 kg / 0.14 pounds
62.0 g / 0.6 N
|
| 2 mm | Stal (~0.2) |
0.02 kg / 0.05 pounds
22.0 g / 0.2 N
|
| 3 mm | Stal (~0.2) |
0.01 kg / 0.02 pounds
8.0 g / 0.1 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 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: Vertical assembly (sliding) - behavior on slippery surfaces
MP 5x1.5x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.23 kg / 0.51 pounds
231.0 g / 2.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.15 kg / 0.34 pounds
154.0 g / 1.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.08 kg / 0.17 pounds
77.0 g / 0.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.39 kg / 0.85 pounds
385.0 g / 3.8 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MP 5x1.5x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.08 kg / 0.17 pounds
77.0 g / 0.8 N
|
| 1 mm |
|
0.19 kg / 0.42 pounds
192.5 g / 1.9 N
|
| 2 mm |
|
0.39 kg / 0.85 pounds
385.0 g / 3.8 N
|
| 3 mm |
|
0.58 kg / 1.27 pounds
577.5 g / 5.7 N
|
| 5 mm |
|
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
|
| 10 mm |
|
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
|
| 11 mm |
|
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
|
| 12 mm |
|
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
|
Table 5: Working in heat (stability) - thermal limit
MP 5x1.5x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
|
OK |
| 40 °C | -2.2% |
0.75 kg / 1.66 pounds
753.1 g / 7.4 N
|
OK |
| 60 °C | -4.4% |
0.74 kg / 1.62 pounds
736.1 g / 7.2 N
|
OK |
| 80 °C | -6.6% |
0.72 kg / 1.59 pounds
719.2 g / 7.1 N
|
|
| 100 °C | -28.8% |
0.55 kg / 1.21 pounds
548.2 g / 5.4 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 5x1.5x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.50 kg / 5.50 pounds
6 171 Gs
|
0.37 kg / 0.83 pounds
374 g / 3.7 N
|
N/A |
| 1 mm |
1.62 kg / 3.58 pounds
9 932 Gs
|
0.24 kg / 0.54 pounds
244 g / 2.4 N
|
1.46 kg / 3.22 pounds
~0 Gs
|
| 2 mm |
0.99 kg / 2.19 pounds
7 760 Gs
|
0.15 kg / 0.33 pounds
149 g / 1.5 N
|
0.89 kg / 1.97 pounds
~0 Gs
|
| 3 mm |
0.59 kg / 1.30 pounds
5 986 Gs
|
0.09 kg / 0.20 pounds
88 g / 0.9 N
|
0.53 kg / 1.17 pounds
~0 Gs
|
| 5 mm |
0.21 kg / 0.47 pounds
3 600 Gs
|
0.03 kg / 0.07 pounds
32 g / 0.3 N
|
0.19 kg / 0.42 pounds
~0 Gs
|
| 10 mm |
0.03 kg / 0.06 pounds
1 281 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 pounds
349 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
50 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
33 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
23 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
17 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
13 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
10 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
MP 5x1.5x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 5.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 3.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.5 cm |
| Remote | 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: Collisions (kinetic energy) - collision effects
MP 5x1.5x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
44.27 km/h
(12.30 m/s)
|
0.03 J | |
| 30 mm |
76.64 km/h
(21.29 m/s)
|
0.09 J | |
| 50 mm |
98.94 km/h
(27.48 m/s)
|
0.15 J | |
| 100 mm |
139.93 km/h
(38.87 m/s)
|
0.30 J |
Table 9: Anti-corrosion coating durability
MP 5x1.5x3 / 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: Construction data (Pc)
MP 5x1.5x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 811 Mx | 8.1 µWb |
| Pc Coefficient | 1.66 | High (Stable) |
Table 11: Underwater work (magnet fishing)
MP 5x1.5x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.77 kg | Standard |
| Water (riverbed) |
0.88 kg
(+0.11 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical wall, the magnet holds just approx. 20-30% of its nominal pull.
2. Steel saturation
*Thin steel (e.g. computer case) severely reduces the holding force.
3. Heat tolerance
*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) = 1.66
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 |
Other proposals
Strengths and weaknesses of neodymium magnets.
Benefits
- They retain attractive force for nearly ten years – the drop is just ~1% (based on simulations),
- They are extremely resistant to demagnetization induced by external disturbances,
- The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to look better,
- They show 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 custom forming as well as adjusting to atypical requirements,
- Wide application in innovative solutions – they serve a role in data components, electric motors, diagnostic systems, as well as other advanced devices.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Limitations
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
- NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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
- When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
- We suggest a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex forms.
- Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets can complicate diagnosis medical after entering the body.
- With large orders the cost of neodymium magnets is economically unviable,
Pull force analysis
Maximum holding power of the magnet – what affects it?
- using a base made of low-carbon steel, acting as a ideal flux conductor
- whose thickness is min. 10 mm
- with a surface cleaned and smooth
- with total lack of distance (without impurities)
- for force applied at a right angle (in the magnet axis)
- at ambient temperature room level
Determinants of lifting force in real conditions
- Clearance – the presence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
- Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
- Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
- Steel grade – ideal substrate is pure iron steel. Hardened steels may attract less.
- Smoothness – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
- Temperature influence – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.
Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, however under shearing force the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate lowers the load capacity.
Safe handling of neodymium magnets
Precision electronics
GPS units and smartphones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.
Combustion hazard
Powder produced during machining of magnets is combustible. Do not drill into magnets unless you are an expert.
Conscious usage
Handle magnets consciously. Their huge power can shock even experienced users. Stay alert and respect their power.
Data carriers
Device Safety: Strong magnets can ruin payment cards and sensitive devices (heart implants, medical aids, mechanical watches).
Magnets are brittle
Beware of splinters. Magnets can fracture upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.
Skin irritation risks
A percentage of the population experience a contact allergy to Ni, which is the standard coating for neodymium magnets. Prolonged contact can result in an allergic reaction. We suggest wear protective gloves.
Product not for children
Only for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from kids and pets.
Thermal limits
Avoid heat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).
Implant safety
People with a pacemaker should maintain an safe separation from magnets. The magnetic field can disrupt the functioning of the life-saving device.
Finger safety
Danger of trauma: The pulling power is so immense that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.
