MP 24x16x2 / N38 - ring magnet
ring magnet
Catalog no 030495
GTIN/EAN: 5906301812364
Diameter
24 mm [±0,1 mm]
internal diameter Ø
16 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
3.77 g
Magnetization Direction
↑ axial
Load capacity
0.94 kg / 9.22 N
Magnetic Induction
101.91 mT / 1019 Gs
Coating
[NiCuNi] Nickel
3.69 ZŁ with VAT / pcs + price for transport
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Detailed specification - MP 24x16x2 / N38 - ring magnet
Specification / characteristics - MP 24x16x2 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030495 |
| GTIN/EAN | 5906301812364 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 24 mm [±0,1 mm] |
| internal diameter Ø | 16 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 3.77 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.94 kg / 9.22 N |
| Magnetic Induction ~ ? | 101.91 mT / 1019 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 - data
The following data constitute the direct effect of a mathematical simulation. Results are based on algorithms for the class Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.
Table 1: Static force (pull vs distance) - power drop
MP 24x16x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5807 Gs
580.7 mT
|
0.94 kg / 2.07 pounds
940.0 g / 9.2 N
|
weak grip |
| 1 mm |
5318 Gs
531.8 mT
|
0.79 kg / 1.74 pounds
788.4 g / 7.7 N
|
weak grip |
| 2 mm |
4833 Gs
483.3 mT
|
0.65 kg / 1.44 pounds
651.1 g / 6.4 N
|
weak grip |
| 3 mm |
4366 Gs
436.6 mT
|
0.53 kg / 1.17 pounds
531.5 g / 5.2 N
|
weak grip |
| 5 mm |
3517 Gs
351.7 mT
|
0.34 kg / 0.76 pounds
344.9 g / 3.4 N
|
weak grip |
| 10 mm |
1995 Gs
199.5 mT
|
0.11 kg / 0.24 pounds
111.0 g / 1.1 N
|
weak grip |
| 15 mm |
1168 Gs
116.8 mT
|
0.04 kg / 0.08 pounds
38.0 g / 0.4 N
|
weak grip |
| 20 mm |
727 Gs
72.7 mT
|
0.01 kg / 0.03 pounds
14.7 g / 0.1 N
|
weak grip |
| 30 mm |
332 Gs
33.2 mT
|
0.00 kg / 0.01 pounds
3.1 g / 0.0 N
|
weak grip |
| 50 mm |
106 Gs
10.6 mT
|
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
|
weak grip |
Table 2: Shear force (wall)
MP 24x16x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.19 kg / 0.41 pounds
188.0 g / 1.8 N
|
| 1 mm | Stal (~0.2) |
0.16 kg / 0.35 pounds
158.0 g / 1.5 N
|
| 2 mm | Stal (~0.2) |
0.13 kg / 0.29 pounds
130.0 g / 1.3 N
|
| 3 mm | Stal (~0.2) |
0.11 kg / 0.23 pounds
106.0 g / 1.0 N
|
| 5 mm | Stal (~0.2) |
0.07 kg / 0.15 pounds
68.0 g / 0.7 N
|
| 10 mm | Stal (~0.2) |
0.02 kg / 0.05 pounds
22.0 g / 0.2 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.02 pounds
8.0 g / 0.1 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 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 (shearing) - vertical pull
MP 24x16x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.28 kg / 0.62 pounds
282.0 g / 2.8 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.19 kg / 0.41 pounds
188.0 g / 1.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.09 kg / 0.21 pounds
94.0 g / 0.9 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.47 kg / 1.04 pounds
470.0 g / 4.6 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 24x16x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.09 kg / 0.21 pounds
94.0 g / 0.9 N
|
| 1 mm |
|
0.24 kg / 0.52 pounds
235.0 g / 2.3 N
|
| 2 mm |
|
0.47 kg / 1.04 pounds
470.0 g / 4.6 N
|
| 3 mm |
|
0.71 kg / 1.55 pounds
705.0 g / 6.9 N
|
| 5 mm |
|
0.94 kg / 2.07 pounds
940.0 g / 9.2 N
|
| 10 mm |
|
0.94 kg / 2.07 pounds
940.0 g / 9.2 N
|
| 11 mm |
|
0.94 kg / 2.07 pounds
940.0 g / 9.2 N
|
| 12 mm |
|
0.94 kg / 2.07 pounds
940.0 g / 9.2 N
|
Table 5: Working in heat (stability) - thermal limit
MP 24x16x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.94 kg / 2.07 pounds
940.0 g / 9.2 N
|
OK |
| 40 °C | -2.2% |
0.92 kg / 2.03 pounds
919.3 g / 9.0 N
|
OK |
| 60 °C | -4.4% |
0.90 kg / 1.98 pounds
898.6 g / 8.8 N
|
OK |
| 80 °C | -6.6% |
0.88 kg / 1.94 pounds
878.0 g / 8.6 N
|
|
| 100 °C | -28.8% |
0.67 kg / 1.48 pounds
669.3 g / 6.6 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 24x16x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
79.38 kg / 175.01 pounds
6 091 Gs
|
11.91 kg / 26.25 pounds
11908 g / 116.8 N
|
N/A |
| 1 mm |
72.89 kg / 160.70 pounds
11 129 Gs
|
10.93 kg / 24.11 pounds
10934 g / 107.3 N
|
65.60 kg / 144.63 pounds
~0 Gs
|
| 2 mm |
66.58 kg / 146.78 pounds
10 636 Gs
|
9.99 kg / 22.02 pounds
9987 g / 98.0 N
|
59.92 kg / 132.10 pounds
~0 Gs
|
| 3 mm |
60.60 kg / 133.60 pounds
10 147 Gs
|
9.09 kg / 20.04 pounds
9090 g / 89.2 N
|
54.54 kg / 120.24 pounds
~0 Gs
|
| 5 mm |
49.75 kg / 109.67 pounds
9 194 Gs
|
7.46 kg / 16.45 pounds
7462 g / 73.2 N
|
44.77 kg / 98.70 pounds
~0 Gs
|
| 10 mm |
29.13 kg / 64.21 pounds
7 035 Gs
|
4.37 kg / 9.63 pounds
4369 g / 42.9 N
|
26.21 kg / 57.79 pounds
~0 Gs
|
| 20 mm |
9.37 kg / 20.67 pounds
3 991 Gs
|
1.41 kg / 3.10 pounds
1406 g / 13.8 N
|
8.44 kg / 18.60 pounds
~0 Gs
|
| 50 mm |
0.54 kg / 1.19 pounds
958 Gs
|
0.08 kg / 0.18 pounds
81 g / 0.8 N
|
0.49 kg / 1.07 pounds
~0 Gs
|
| 60 mm |
0.26 kg / 0.57 pounds
663 Gs
|
0.04 kg / 0.09 pounds
39 g / 0.4 N
|
0.23 kg / 0.51 pounds
~0 Gs
|
| 70 mm |
0.13 kg / 0.30 pounds
478 Gs
|
0.02 kg / 0.04 pounds
20 g / 0.2 N
|
0.12 kg / 0.27 pounds
~0 Gs
|
| 80 mm |
0.07 kg / 0.16 pounds
356 Gs
|
0.01 kg / 0.02 pounds
11 g / 0.1 N
|
0.07 kg / 0.15 pounds
~0 Gs
|
| 90 mm |
0.04 kg / 0.10 pounds
272 Gs
|
0.01 kg / 0.01 pounds
7 g / 0.1 N
|
0.04 kg / 0.09 pounds
~0 Gs
|
| 100 mm |
0.03 kg / 0.06 pounds
213 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
MP 24x16x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 16.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 13.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 10.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 7.5 cm |
| Remote | 50 Gs (5.0 mT) | 7.0 cm |
| Payment card | 400 Gs (40.0 mT) | 3.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.5 cm |
Table 8: Collisions (kinetic energy) - collision effects
MP 24x16x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
17.06 km/h
(4.74 m/s)
|
0.04 J | |
| 30 mm |
27.64 km/h
(7.68 m/s)
|
0.11 J | |
| 50 mm |
35.62 km/h
(9.89 m/s)
|
0.18 J | |
| 100 mm |
50.36 km/h
(13.99 m/s)
|
0.37 J |
Table 9: Surface protection spec
MP 24x16x2 / 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 (Flux)
MP 24x16x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 23 520 Mx | 235.2 µWb |
| Pc Coefficient | 1.04 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MP 24x16x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.94 kg | Standard |
| Water (riverbed) |
1.08 kg
(+0.14 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical surface, the magnet holds just ~20% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) severely reduces the holding force.
3. Power loss vs temp
*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) = 1.04
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 |
Other deals
Pros as well as cons of Nd2Fe14B magnets.
Advantages
- They do not lose power, even during around 10 years – the reduction in power is only ~1% (theoretically),
- They do not lose their magnetic properties even under close interference source,
- The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- Neodymium magnets achieve maximum magnetic induction on a their surface, which ensures high operational effectiveness,
- Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to versatility in constructing and the capacity to modify to specific needs,
- Key role in electronics industry – they find application in mass storage devices, motor assemblies, advanced medical instruments, and modern systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in small systems
Limitations
- At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
- Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing threads and complex shapes in magnets, we propose using casing - magnetic holder.
- Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that small components of these products can be problematic in diagnostics medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Holding force characteristics
Highest magnetic holding force – what it depends on?
- with the use of a yoke made of special test steel, ensuring maximum field concentration
- whose thickness reaches at least 10 mm
- with an polished contact surface
- with direct contact (without impurities)
- during pulling in a direction perpendicular to the plane
- at room temperature
Practical lifting capacity: influencing factors
- Distance – the presence of any layer (rust, dirt, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Material composition – not every steel attracts identically. High carbon content weaken the interaction with the magnet.
- Surface quality – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
- Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Lifting capacity was determined using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a small distance between the magnet’s surface and the plate lowers the holding force.
Safety rules for work with neodymium magnets
Serious injuries
Large magnets can crush fingers instantly. Never place your hand betwixt two strong magnets.
Protect data
Data protection: Neodymium magnets can damage data carriers and sensitive devices (heart implants, medical aids, mechanical watches).
Avoid contact if allergic
It is widely known that nickel (standard magnet coating) is a potent allergen. If you have an allergy, prevent touching magnets with bare hands and choose coated magnets.
Eye protection
Neodymium magnets are ceramic materials, meaning they are fragile like glass. Collision of two magnets leads to them breaking into small pieces.
Impact on smartphones
An intense magnetic field disrupts the functioning of magnetometers in phones and GPS navigation. Keep magnets close to a device to prevent breaking the sensors.
Permanent damage
Control the heat. Heating the magnet to high heat will destroy its properties and pulling force.
Pacemakers
Health Alert: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.
Safe operation
Handle magnets with awareness. Their immense force can shock even professionals. Stay alert and respect their power.
This is not a toy
Absolutely store magnets away from children. Choking hazard is high, and the effects of magnets clamping inside the body are tragic.
Do not drill into magnets
Combustion risk: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.
