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
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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 |
Engineering simulation of the assembly - technical parameters
Presented values constitute the direct effect of a mathematical simulation. Results were calculated on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Use these data as a preliminary roadmap for designers.
Table 1: Static pull force (pull 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 pounds
940.0 g / 9.2 N
|
safe |
| 1 mm |
5318 Gs
531.8 mT
|
0.79 kg / 1.74 pounds
788.4 g / 7.7 N
|
safe |
| 2 mm |
4833 Gs
483.3 mT
|
0.65 kg / 1.44 pounds
651.1 g / 6.4 N
|
safe |
| 3 mm |
4366 Gs
436.6 mT
|
0.53 kg / 1.17 pounds
531.5 g / 5.2 N
|
safe |
| 5 mm |
3517 Gs
351.7 mT
|
0.34 kg / 0.76 pounds
344.9 g / 3.4 N
|
safe |
| 10 mm |
1995 Gs
199.5 mT
|
0.11 kg / 0.24 pounds
111.0 g / 1.1 N
|
safe |
| 15 mm |
1168 Gs
116.8 mT
|
0.04 kg / 0.08 pounds
38.0 g / 0.4 N
|
safe |
| 20 mm |
727 Gs
72.7 mT
|
0.01 kg / 0.03 pounds
14.7 g / 0.1 N
|
safe |
| 30 mm |
332 Gs
33.2 mT
|
0.00 kg / 0.01 pounds
3.1 g / 0.0 N
|
safe |
| 50 mm |
106 Gs
10.6 mT
|
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
|
safe |
Table 2: Sliding 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) - 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) - power drop
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: Two magnets (repulsion) - field range
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: Protective zones (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 |
| Timepiece | 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 (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: Electrical 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: 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
*Caution: On a vertical surface, the magnet retains just ~20% of its perpendicular strength.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) drastically limits 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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
See also products
Pros and cons of rare earth magnets.
Strengths
- Their power remains stable, and after around 10 years it drops only by ~1% (theoretically),
- They have excellent resistance to magnetic field loss as a result of external magnetic sources,
- The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to look better,
- They show high magnetic induction at the operating surface, which affects their effectiveness,
- 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 accurate forming and adapting to concrete requirements,
- Significant place in modern technologies – they are utilized in HDD drives, electric motors, medical devices, as well as complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in small systems
Weaknesses
- They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
- Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating nuts and complicated forms in magnets, we propose using cover - magnetic holder.
- Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these products can disrupt the diagnostic process medical in case of swallowing.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what affects it?
- with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
- whose thickness is min. 10 mm
- characterized by smoothness
- with direct contact (without paint)
- for force applied at a right angle (in the magnet axis)
- at room temperature
Practical lifting capacity: influencing factors
- Air gap (between the magnet and the plate), because even a very small clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
- Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
- Plate material – mild steel attracts best. Higher carbon content reduce magnetic properties and holding force.
- Surface finish – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
- Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).
Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.
H&S for magnets
Product not for children
These products are not intended for children. Swallowing several magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and necessitates urgent medical intervention.
Warning for allergy sufferers
Allergy Notice: The nickel-copper-nickel coating consists of nickel. If redness happens, immediately stop handling magnets and wear gloves.
Impact on smartphones
GPS units and smartphones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.
Safe distance
Device Safety: Neodymium magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).
Thermal limits
Do not overheat. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).
Risk of cracking
Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
Flammability
Powder produced during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.
Finger safety
Watch your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!
Pacemakers
Medical warning: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.
Handling guide
Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.
