MP 20x10x5 / N38 - ring magnet
ring magnet
Catalog no 030184
GTIN/EAN: 5906301812012
Diameter
20 mm [±0,1 mm]
internal diameter Ø
10 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
8.84 g
Magnetization Direction
↑ axial
Load capacity
5.20 kg / 50.97 N
Magnetic Induction
277.16 mT / 2772 Gs
Coating
[NiCuNi] Nickel
4.50 ZŁ with VAT / pcs + price for transport
3.66 ZŁ net + 23% VAT / pcs
bulk discounts:
Need more?
Call us
+48 22 499 98 98
if you prefer get in touch via
inquiry form
the contact form page.
Lifting power and form of a magnet can be verified on our
magnetic calculator.
Orders placed before 14:00 will be shipped the same business day.
Physical properties - MP 20x10x5 / N38 - ring magnet
Specification / characteristics - MP 20x10x5 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030184 |
| GTIN/EAN | 5906301812012 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 20 mm [±0,1 mm] |
| internal diameter Ø | 10 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 8.84 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 5.20 kg / 50.97 N |
| Magnetic Induction ~ ? | 277.16 mT / 2772 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 analysis of the product - technical parameters
Presented information represent the result of a physical simulation. Values are based on algorithms for the material Nd2Fe14B. Real-world performance may differ from theoretical values. Please consider these data as a supplementary guide when designing systems.
Table 1: Static pull force (pull vs distance) - interaction chart
MP 20x10x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5917 Gs
591.7 mT
|
5.20 kg / 11.46 lbs
5200.0 g / 51.0 N
|
strong |
| 1 mm |
5321 Gs
532.1 mT
|
4.21 kg / 9.27 lbs
4205.9 g / 41.3 N
|
strong |
| 2 mm |
4736 Gs
473.6 mT
|
3.33 kg / 7.35 lbs
3332.2 g / 32.7 N
|
strong |
| 3 mm |
4184 Gs
418.4 mT
|
2.60 kg / 5.73 lbs
2600.0 g / 25.5 N
|
strong |
| 5 mm |
3216 Gs
321.6 mT
|
1.54 kg / 3.39 lbs
1536.2 g / 15.1 N
|
low risk |
| 10 mm |
1650 Gs
165.0 mT
|
0.40 kg / 0.89 lbs
404.2 g / 4.0 N
|
low risk |
| 15 mm |
907 Gs
90.7 mT
|
0.12 kg / 0.27 lbs
122.3 g / 1.2 N
|
low risk |
| 20 mm |
544 Gs
54.4 mT
|
0.04 kg / 0.10 lbs
44.0 g / 0.4 N
|
low risk |
| 30 mm |
240 Gs
24.0 mT
|
0.01 kg / 0.02 lbs
8.5 g / 0.1 N
|
low risk |
| 50 mm |
75 Gs
7.5 mT
|
0.00 kg / 0.00 lbs
0.8 g / 0.0 N
|
low risk |
Table 2: Sliding force (wall)
MP 20x10x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.04 kg / 2.29 lbs
1040.0 g / 10.2 N
|
| 1 mm | Stal (~0.2) |
0.84 kg / 1.86 lbs
842.0 g / 8.3 N
|
| 2 mm | Stal (~0.2) |
0.67 kg / 1.47 lbs
666.0 g / 6.5 N
|
| 3 mm | Stal (~0.2) |
0.52 kg / 1.15 lbs
520.0 g / 5.1 N
|
| 5 mm | Stal (~0.2) |
0.31 kg / 0.68 lbs
308.0 g / 3.0 N
|
| 10 mm | Stal (~0.2) |
0.08 kg / 0.18 lbs
80.0 g / 0.8 N
|
| 15 mm | Stal (~0.2) |
0.02 kg / 0.05 lbs
24.0 g / 0.2 N
|
| 20 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
8.0 g / 0.1 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 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 (sliding) - behavior on slippery surfaces
MP 20x10x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.56 kg / 3.44 lbs
1560.0 g / 15.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.04 kg / 2.29 lbs
1040.0 g / 10.2 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.52 kg / 1.15 lbs
520.0 g / 5.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.60 kg / 5.73 lbs
2600.0 g / 25.5 N
|
Table 4: Material efficiency (substrate influence) - power losses
MP 20x10x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.52 kg / 1.15 lbs
520.0 g / 5.1 N
|
| 1 mm |
|
1.30 kg / 2.87 lbs
1300.0 g / 12.8 N
|
| 2 mm |
|
2.60 kg / 5.73 lbs
2600.0 g / 25.5 N
|
| 3 mm |
|
3.90 kg / 8.60 lbs
3900.0 g / 38.3 N
|
| 5 mm |
|
5.20 kg / 11.46 lbs
5200.0 g / 51.0 N
|
| 10 mm |
|
5.20 kg / 11.46 lbs
5200.0 g / 51.0 N
|
| 11 mm |
|
5.20 kg / 11.46 lbs
5200.0 g / 51.0 N
|
| 12 mm |
|
5.20 kg / 11.46 lbs
5200.0 g / 51.0 N
|
Table 5: Working in heat (stability) - power drop
MP 20x10x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
5.20 kg / 11.46 lbs
5200.0 g / 51.0 N
|
OK |
| 40 °C | -2.2% |
5.09 kg / 11.21 lbs
5085.6 g / 49.9 N
|
OK |
| 60 °C | -4.4% |
4.97 kg / 10.96 lbs
4971.2 g / 48.8 N
|
OK |
| 80 °C | -6.6% |
4.86 kg / 10.71 lbs
4856.8 g / 47.6 N
|
|
| 100 °C | -28.8% |
3.70 kg / 8.16 lbs
3702.4 g / 36.3 N
|
Table 6: Two magnets (attraction) - field range
MP 20x10x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
54.03 kg / 119.11 lbs
6 121 Gs
|
8.10 kg / 17.87 lbs
8104 g / 79.5 N
|
N/A |
| 1 mm |
48.76 kg / 107.50 lbs
11 242 Gs
|
7.31 kg / 16.13 lbs
7314 g / 71.8 N
|
43.89 kg / 96.75 lbs
~0 Gs
|
| 2 mm |
43.70 kg / 96.34 lbs
10 642 Gs
|
6.55 kg / 14.45 lbs
6555 g / 64.3 N
|
39.33 kg / 86.71 lbs
~0 Gs
|
| 3 mm |
38.98 kg / 85.94 lbs
10 051 Gs
|
5.85 kg / 12.89 lbs
5847 g / 57.4 N
|
35.08 kg / 77.34 lbs
~0 Gs
|
| 5 mm |
30.63 kg / 67.54 lbs
8 910 Gs
|
4.60 kg / 10.13 lbs
4595 g / 45.1 N
|
27.57 kg / 60.78 lbs
~0 Gs
|
| 10 mm |
15.96 kg / 35.19 lbs
6 432 Gs
|
2.39 kg / 5.28 lbs
2394 g / 23.5 N
|
14.36 kg / 31.67 lbs
~0 Gs
|
| 20 mm |
4.20 kg / 9.26 lbs
3 299 Gs
|
0.63 kg / 1.39 lbs
630 g / 6.2 N
|
3.78 kg / 8.33 lbs
~0 Gs
|
| 50 mm |
0.19 kg / 0.42 lbs
702 Gs
|
0.03 kg / 0.06 lbs
29 g / 0.3 N
|
0.17 kg / 0.38 lbs
~0 Gs
|
| 60 mm |
0.09 kg / 0.20 lbs
480 Gs
|
0.01 kg / 0.03 lbs
13 g / 0.1 N
|
0.08 kg / 0.18 lbs
~0 Gs
|
| 70 mm |
0.05 kg / 0.10 lbs
342 Gs
|
0.01 kg / 0.01 lbs
7 g / 0.1 N
|
0.04 kg / 0.09 lbs
~0 Gs
|
| 80 mm |
0.02 kg / 0.05 lbs
253 Gs
|
0.00 kg / 0.01 lbs
4 g / 0.0 N
|
0.02 kg / 0.05 lbs
~0 Gs
|
| 90 mm |
0.01 kg / 0.03 lbs
193 Gs
|
0.00 kg / 0.00 lbs
2 g / 0.0 N
|
0.01 kg / 0.03 lbs
~0 Gs
|
| 100 mm |
0.01 kg / 0.02 lbs
150 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Hazards (implants) - warnings
MP 20x10x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 14.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 11.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 9.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 6.5 cm |
| Car key | 50 Gs (5.0 mT) | 6.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.0 cm |
Table 8: Collisions (kinetic energy) - collision effects
MP 20x10x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
25.62 km/h
(7.12 m/s)
|
0.22 J | |
| 30 mm |
42.41 km/h
(11.78 m/s)
|
0.61 J | |
| 50 mm |
54.70 km/h
(15.19 m/s)
|
1.02 J | |
| 100 mm |
77.35 km/h
(21.49 m/s)
|
2.04 J |
Table 9: Corrosion resistance
MP 20x10x5 / 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 20x10x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 16 116 Mx | 161.2 µWb |
| Pc Coefficient | 1.13 | High (Stable) |
Table 11: Underwater work (magnet fishing)
MP 20x10x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 5.20 kg | Standard |
| Water (riverbed) |
5.95 kg
(+0.75 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Note: On a vertical wall, the magnet retains merely approx. 20-30% of its nominal pull.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) severely weakens the holding force.
3. Power loss vs temp
*For N38 grade, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.13
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 |
Check out more deals
Advantages and disadvantages of rare earth magnets.
Benefits
- They have unchanged lifting capacity, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
- They maintain their magnetic properties even under close interference source,
- A magnet with a smooth nickel surface is more attractive,
- The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Thanks to flexibility in constructing and the ability to modify to client solutions,
- Versatile presence in modern technologies – they find application in HDD drives, electric drive systems, medical devices, as well as multitasking production systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Disadvantages
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also raises their 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
- Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- We recommend a housing - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated forms.
- Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these products are able to complicate diagnosis medical after entering the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Pull force analysis
Optimal lifting capacity of a neodymium magnet – what it depends on?
- on a block made of mild steel, perfectly concentrating the magnetic flux
- possessing a thickness of at least 10 mm to avoid saturation
- with a surface perfectly flat
- with direct contact (without impurities)
- during pulling in a direction vertical to the plane
- in neutral thermal conditions
Lifting capacity in real conditions – factors
- Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
- Load vector – highest force is available only during perpendicular pulling. The shear force of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
- Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
- Material type – ideal substrate is high-permeability steel. Stainless steels may attract less.
- Plate texture – ground elements guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
- Thermal environment – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.
Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate decreases the holding force.
Warnings
Product not for children
Absolutely store magnets away from children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are tragic.
Machining danger
Powder created during cutting of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
Life threat
Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.
Keep away from electronics
A strong magnetic field negatively affects the operation of compasses in phones and GPS navigation. Keep magnets near a device to avoid breaking the sensors.
Serious injuries
Risk of injury: The attraction force is so immense that it can result in blood blisters, crushing, and broken bones. Protective gloves are recommended.
Do not underestimate power
Handle magnets with awareness. Their powerful strength can surprise even experienced users. Be vigilant and respect their power.
Metal Allergy
Allergy Notice: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, cease handling magnets and use protective gear.
Fragile material
Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. We recommend safety glasses.
Operating temperature
Control the heat. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.
Keep away from computers
Very strong magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.
