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
3.00 ZŁ net + 23% VAT / pcs
bulk discounts:
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Physical properties - 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 |
Physical simulation of the assembly - report
The following values represent the direct effect of a engineering calculation. Values are based on algorithms for the material Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Use these calculations as a reference point for designers.
Table 1: Static pull force (pull vs gap) - characteristics
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
|
low risk |
| 1 mm |
5318 Gs
531.8 mT
|
0.79 kg / 1.74 pounds
788.4 g / 7.7 N
|
low risk |
| 2 mm |
4833 Gs
483.3 mT
|
0.65 kg / 1.44 pounds
651.1 g / 6.4 N
|
low risk |
| 3 mm |
4366 Gs
436.6 mT
|
0.53 kg / 1.17 pounds
531.5 g / 5.2 N
|
low risk |
| 5 mm |
3517 Gs
351.7 mT
|
0.34 kg / 0.76 pounds
344.9 g / 3.4 N
|
low risk |
| 10 mm |
1995 Gs
199.5 mT
|
0.11 kg / 0.24 pounds
111.0 g / 1.1 N
|
low risk |
| 15 mm |
1168 Gs
116.8 mT
|
0.04 kg / 0.08 pounds
38.0 g / 0.4 N
|
low risk |
| 20 mm |
727 Gs
72.7 mT
|
0.01 kg / 0.03 pounds
14.7 g / 0.1 N
|
low risk |
| 30 mm |
332 Gs
33.2 mT
|
0.00 kg / 0.01 pounds
3.1 g / 0.0 N
|
low risk |
| 50 mm |
106 Gs
10.6 mT
|
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
|
low risk |
Table 2: Slippage force (vertical surface)
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: Vertical assembly (sliding) - behavior on slippery surfaces
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: Material efficiency (saturation) - power losses
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: Thermal resistance (stability) - resistance threshold
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) - field collision
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: Hazards (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 |
| Mechanical watch | 20 Gs (2.0 mT) | 10.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 7.5 cm |
| Car key | 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 (cracking risk) - warning
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: Anti-corrosion coating durability
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 (Pc)
MP 24x16x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 23 520 Mx | 235.2 µWb |
| Pc Coefficient | 1.04 | High (Stable) |
Table 11: Physics of underwater searching
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. Shear force
*Caution: On a vertical surface, the magnet holds merely approx. 20-30% of its nominal pull.
2. Plate thickness effect
*Thin steel (e.g. computer case) severely limits the holding force.
3. Thermal stability
*For standard magnets, the safety 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.
Chemical composition
| 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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Advantages as well as disadvantages of rare earth magnets.
Pros
- They have unchanged lifting capacity, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
- They have excellent resistance to magnetic field loss due to external fields,
- By applying a smooth layer of nickel, the element acquires an nice look,
- The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
- Thanks to modularity in designing and the ability to modify to specific needs,
- Versatile presence in advanced technology sectors – they serve a role in mass storage devices, brushless drives, diagnostic systems, also industrial machines.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Disadvantages
- To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
- Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and 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
- Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
- We recommend cover - magnetic holder, due to difficulties in producing threads inside the magnet and complicated forms.
- Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
- Due to complex production process, their price is relatively high,
Lifting parameters
Maximum lifting force for a neodymium magnet – what affects it?
- using a plate made of mild steel, acting as a circuit closing element
- 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 applied at a right angle (pull-off, not shear)
- in neutral thermal conditions
Impact of factors on magnetic holding capacity in practice
- Gap (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
- Force direction – 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.
- Plate thickness – too thin sheet does not close the flux, causing part of the flux to be escaped to the other side.
- Steel grade – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
- Plate texture – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
- Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity was measured by applying a steel plate with a smooth surface 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 slight gap between the magnet and the plate reduces the holding force.
Warnings
Conscious usage
Use magnets consciously. Their immense force can shock even experienced users. Stay alert and respect their force.
Do not overheat magnets
Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.
Keep away from children
Always keep magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are fatal.
Machining danger
Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.
Safe distance
Do not bring magnets near a wallet, laptop, or TV. The magnetism can destroy these devices and erase data from cards.
Allergic reactions
Certain individuals experience a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Extended handling may cause a rash. It is best to wear protective gloves.
Bone fractures
Danger of trauma: The attraction force is so great that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.
Magnet fragility
Protect your eyes. Magnets can fracture upon violent connection, ejecting shards into the air. We recommend safety glasses.
Medical interference
Patients with a pacemaker should maintain an large gap from magnets. The magnetic field can disrupt the functioning of the implant.
Keep away from electronics
Remember: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a separation from your mobile, tablet, and navigation systems.
