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:
Need more?
Call us
+48 22 499 98 98
or send us a note via
form
through our site.
Parameters along with form of magnetic components can be estimated with our
force calculator.
Same-day processing for orders placed before 14:00.
Technical of the product - 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 simulation of the assembly - report
Presented data constitute the direct effect of a engineering analysis. Values were calculated on models for the material Nd2Fe14B. Operational conditions may differ. Please consider these data as a supplementary guide when designing systems.
Table 1: Static force (force vs distance) - 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: Shear capacity (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 (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 (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: Working in heat (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) | Lateral 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) - 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 (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: Coating parameters (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
*Warning: On a vertical wall, the magnet holds merely a fraction of its max power.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Thermal stability
*For standard magnets, 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 offers
Strengths as well as weaknesses of rare earth magnets.
Benefits
- They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
- Neodymium magnets remain extremely resistant to loss of magnetic properties caused by external interference,
- The use of an refined coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- Magnetic induction on the working layer of the magnet remains very high,
- 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...
- Thanks to freedom in designing and the ability to adapt to specific needs,
- Wide application in future technologies – they find application in computer drives, electric motors, medical equipment, and complex engineering applications.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Weaknesses
- At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
- When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
- We recommend casing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated shapes.
- Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Pull force analysis
Highest magnetic holding force – what affects it?
- with the application of a yoke made of low-carbon steel, guaranteeing maximum field concentration
- with a thickness of at least 10 mm
- characterized by even structure
- without any air gap between the magnet and steel
- under vertical force direction (90-degree angle)
- at room temperature
Practical lifting capacity: influencing factors
- Distance – existence of any layer (paint, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Load vector – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
- Base massiveness – insufficiently thick steel does not close the flux, causing part of the flux to be lost to the other side.
- Chemical composition of the base – mild steel attracts best. Alloy admixtures decrease magnetic permeability and lifting capacity.
- Base smoothness – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
- Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).
Lifting capacity was determined by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet and the plate decreases the holding force.
Warnings
Danger to the youngest
Absolutely keep magnets away from children. Choking hazard is high, and the consequences of magnets connecting inside the body are tragic.
Flammability
Dust created during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
Handling rules
Use magnets consciously. Their immense force can shock even experienced users. Be vigilant and do not underestimate their power.
GPS and phone interference
Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.
Warning for heart patients
Individuals with a pacemaker must keep an absolute distance from magnets. The magnetism can stop the functioning of the life-saving device.
Magnetic media
Intense magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.
Finger safety
Big blocks can smash fingers instantly. Never put your hand betwixt two attracting surfaces.
Permanent damage
Avoid heat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, ask us about HT versions (H, SH, UH).
Avoid contact if allergic
A percentage of the population suffer from a sensitization to nickel, which is the standard coating for neodymium magnets. Prolonged contact might lead to skin redness. We suggest use safety gloves.
Fragile material
Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.
