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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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 |
Physical simulation of the magnet - technical parameters
Presented values represent the result of a mathematical calculation. Results rely on models for the material Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Use these data as a supplementary guide for designers.
Table 1: Static pull force (force vs distance) - interaction chart
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 LBS
940.0 g / 9.2 N
|
low risk |
| 1 mm |
5318 Gs
531.8 mT
|
0.79 kg / 1.74 LBS
788.4 g / 7.7 N
|
low risk |
| 2 mm |
4833 Gs
483.3 mT
|
0.65 kg / 1.44 LBS
651.1 g / 6.4 N
|
low risk |
| 3 mm |
4366 Gs
436.6 mT
|
0.53 kg / 1.17 LBS
531.5 g / 5.2 N
|
low risk |
| 5 mm |
3517 Gs
351.7 mT
|
0.34 kg / 0.76 LBS
344.9 g / 3.4 N
|
low risk |
| 10 mm |
1995 Gs
199.5 mT
|
0.11 kg / 0.24 LBS
111.0 g / 1.1 N
|
low risk |
| 15 mm |
1168 Gs
116.8 mT
|
0.04 kg / 0.08 LBS
38.0 g / 0.4 N
|
low risk |
| 20 mm |
727 Gs
72.7 mT
|
0.01 kg / 0.03 LBS
14.7 g / 0.1 N
|
low risk |
| 30 mm |
332 Gs
33.2 mT
|
0.00 kg / 0.01 LBS
3.1 g / 0.0 N
|
low risk |
| 50 mm |
106 Gs
10.6 mT
|
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
|
low risk |
Table 2: Sliding hold (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 LBS
188.0 g / 1.8 N
|
| 1 mm | Stal (~0.2) |
0.16 kg / 0.35 LBS
158.0 g / 1.5 N
|
| 2 mm | Stal (~0.2) |
0.13 kg / 0.29 LBS
130.0 g / 1.3 N
|
| 3 mm | Stal (~0.2) |
0.11 kg / 0.23 LBS
106.0 g / 1.0 N
|
| 5 mm | Stal (~0.2) |
0.07 kg / 0.15 LBS
68.0 g / 0.7 N
|
| 10 mm | Stal (~0.2) |
0.02 kg / 0.05 LBS
22.0 g / 0.2 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.02 LBS
8.0 g / 0.1 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 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 (shearing) - 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 LBS
282.0 g / 2.8 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.19 kg / 0.41 LBS
188.0 g / 1.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.09 kg / 0.21 LBS
94.0 g / 0.9 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.47 kg / 1.04 LBS
470.0 g / 4.6 N
|
Table 4: Steel thickness (saturation) - 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 LBS
94.0 g / 0.9 N
|
| 1 mm |
|
0.24 kg / 0.52 LBS
235.0 g / 2.3 N
|
| 2 mm |
|
0.47 kg / 1.04 LBS
470.0 g / 4.6 N
|
| 3 mm |
|
0.71 kg / 1.55 LBS
705.0 g / 6.9 N
|
| 5 mm |
|
0.94 kg / 2.07 LBS
940.0 g / 9.2 N
|
| 10 mm |
|
0.94 kg / 2.07 LBS
940.0 g / 9.2 N
|
| 11 mm |
|
0.94 kg / 2.07 LBS
940.0 g / 9.2 N
|
| 12 mm |
|
0.94 kg / 2.07 LBS
940.0 g / 9.2 N
|
Table 5: Working in heat (material behavior) - 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 LBS
940.0 g / 9.2 N
|
OK |
| 40 °C | -2.2% |
0.92 kg / 2.03 LBS
919.3 g / 9.0 N
|
OK |
| 60 °C | -4.4% |
0.90 kg / 1.98 LBS
898.6 g / 8.8 N
|
OK |
| 80 °C | -6.6% |
0.88 kg / 1.94 LBS
878.0 g / 8.6 N
|
|
| 100 °C | -28.8% |
0.67 kg / 1.48 LBS
669.3 g / 6.6 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 24x16x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
79.38 kg / 175.01 LBS
6 091 Gs
|
11.91 kg / 26.25 LBS
11908 g / 116.8 N
|
N/A |
| 1 mm |
72.89 kg / 160.70 LBS
11 129 Gs
|
10.93 kg / 24.11 LBS
10934 g / 107.3 N
|
65.60 kg / 144.63 LBS
~0 Gs
|
| 2 mm |
66.58 kg / 146.78 LBS
10 636 Gs
|
9.99 kg / 22.02 LBS
9987 g / 98.0 N
|
59.92 kg / 132.10 LBS
~0 Gs
|
| 3 mm |
60.60 kg / 133.60 LBS
10 147 Gs
|
9.09 kg / 20.04 LBS
9090 g / 89.2 N
|
54.54 kg / 120.24 LBS
~0 Gs
|
| 5 mm |
49.75 kg / 109.67 LBS
9 194 Gs
|
7.46 kg / 16.45 LBS
7462 g / 73.2 N
|
44.77 kg / 98.70 LBS
~0 Gs
|
| 10 mm |
29.13 kg / 64.21 LBS
7 035 Gs
|
4.37 kg / 9.63 LBS
4369 g / 42.9 N
|
26.21 kg / 57.79 LBS
~0 Gs
|
| 20 mm |
9.37 kg / 20.67 LBS
3 991 Gs
|
1.41 kg / 3.10 LBS
1406 g / 13.8 N
|
8.44 kg / 18.60 LBS
~0 Gs
|
| 50 mm |
0.54 kg / 1.19 LBS
958 Gs
|
0.08 kg / 0.18 LBS
81 g / 0.8 N
|
0.49 kg / 1.07 LBS
~0 Gs
|
| 60 mm |
0.26 kg / 0.57 LBS
663 Gs
|
0.04 kg / 0.09 LBS
39 g / 0.4 N
|
0.23 kg / 0.51 LBS
~0 Gs
|
| 70 mm |
0.13 kg / 0.30 LBS
478 Gs
|
0.02 kg / 0.04 LBS
20 g / 0.2 N
|
0.12 kg / 0.27 LBS
~0 Gs
|
| 80 mm |
0.07 kg / 0.16 LBS
356 Gs
|
0.01 kg / 0.02 LBS
11 g / 0.1 N
|
0.07 kg / 0.15 LBS
~0 Gs
|
| 90 mm |
0.04 kg / 0.10 LBS
272 Gs
|
0.01 kg / 0.01 LBS
7 g / 0.1 N
|
0.04 kg / 0.09 LBS
~0 Gs
|
| 100 mm |
0.03 kg / 0.06 LBS
213 Gs
|
0.00 kg / 0.01 LBS
4 g / 0.0 N
|
0.02 kg / 0.05 LBS
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
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 |
| 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: Impact energy (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: 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: Submerged application
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. Wall mount (shear)
*Note: On a vertical surface, the magnet retains only ~20% of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Power loss vs temp
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.04
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.
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% |
Ecology and recycling (GPSR)
| 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 Nd2Fe14B magnets.
Benefits
- They retain attractive force for nearly 10 years – the drop is just ~1% (in theory),
- Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
- A magnet with a metallic gold surface looks better,
- Neodymium magnets deliver maximum magnetic induction on a small area, which ensures high operational effectiveness,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
- In view of the ability of free forming and customization to unique solutions, NdFeB magnets can be created in a variety of geometric configurations, which amplifies use scope,
- Versatile presence in high-tech industry – they serve a role in data components, brushless drives, advanced medical instruments, and industrial machines.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Limitations
- At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Limited ability of making threads in the magnet and complex forms - recommended is casing - magnet mounting.
- Health risk resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these products can complicate diagnosis medical after entering the body.
- With mass production the cost of neodymium magnets can be a barrier,
Holding force characteristics
Maximum holding power of the magnet – what affects it?
- using a sheet made of low-carbon steel, functioning as a circuit closing element
- possessing a massiveness of at least 10 mm to avoid saturation
- characterized by even structure
- with direct contact (without impurities)
- during pulling in a direction perpendicular to the plane
- at standard ambient temperature
Lifting capacity in practice – influencing factors
- Distance (betwixt the magnet and the plate), because even a very small clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, rust or dirt).
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Base massiveness – insufficiently thick steel causes magnetic saturation, causing part of the power to be lost into the air.
- Material type – ideal substrate is high-permeability steel. Stainless steels may attract less.
- Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
- Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).
Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force 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 lifting capacity.
Safety rules for work with neodymium magnets
Crushing risk
Danger of trauma: The pulling power is so great that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.
Danger to pacemakers
Individuals with a ICD have to maintain an absolute distance from magnets. The magnetic field can stop the functioning of the life-saving device.
Caution required
Exercise caution. Neodymium magnets attract from a long distance and snap with huge force, often faster than you can move away.
Threat to electronics
Do not bring magnets near a purse, laptop, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.
Magnet fragility
NdFeB magnets are ceramic materials, which means they are very brittle. Impact of two magnets leads to them breaking into shards.
Nickel coating and allergies
Allergy Notice: The nickel-copper-nickel coating consists of nickel. If an allergic reaction happens, cease working with magnets and wear gloves.
Threat to navigation
GPS units and mobile phones are highly susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the sensors in your phone.
Combustion hazard
Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.
Maximum temperature
Avoid heat. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).
Choking Hazard
Absolutely store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets clamping inside the body are very dangerous.
