MP 20x8/4x5 / N38 - ring magnet
ring magnet
Catalog no 030333
GTIN/EAN: 5906301812272
Diameter
20 mm [±0,1 mm]
internal diameter Ø
8/4 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
11.31 g
Magnetization Direction
↑ axial
Load capacity
6.65 kg / 65.21 N
Magnetic Induction
277.16 mT / 2772 Gs
Coating
[NiCuNi] Nickel
7.75 ZŁ with VAT / pcs + price for transport
6.30 ZŁ net + 23% VAT / pcs
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Physical properties - MP 20x8/4x5 / N38 - ring magnet
Specification / characteristics - MP 20x8/4x5 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030333 |
| GTIN/EAN | 5906301812272 |
| 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 | 8/4 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 11.31 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 6.65 kg / 65.21 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 outcome of a mathematical analysis. Results rely on models for the class Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Treat these data as a preliminary roadmap when designing systems.
Table 1: Static pull force (pull vs gap) - characteristics
MP 20x8/4x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2424 Gs
242.4 mT
|
6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
|
warning |
| 1 mm |
2265 Gs
226.5 mT
|
5.81 kg / 12.80 LBS
5807.9 g / 57.0 N
|
warning |
| 2 mm |
2070 Gs
207.0 mT
|
4.85 kg / 10.69 LBS
4851.0 g / 47.6 N
|
warning |
| 3 mm |
1858 Gs
185.8 mT
|
3.91 kg / 8.61 LBS
3906.5 g / 38.3 N
|
warning |
| 5 mm |
1437 Gs
143.7 mT
|
2.34 kg / 5.16 LBS
2338.7 g / 22.9 N
|
warning |
| 10 mm |
691 Gs
69.1 mT
|
0.54 kg / 1.19 LBS
540.5 g / 5.3 N
|
low risk |
| 15 mm |
343 Gs
34.3 mT
|
0.13 kg / 0.29 LBS
133.3 g / 1.3 N
|
low risk |
| 20 mm |
186 Gs
18.6 mT
|
0.04 kg / 0.09 LBS
39.3 g / 0.4 N
|
low risk |
| 30 mm |
70 Gs
7.0 mT
|
0.01 kg / 0.01 LBS
5.5 g / 0.1 N
|
low risk |
| 50 mm |
18 Gs
1.8 mT
|
0.00 kg / 0.00 LBS
0.4 g / 0.0 N
|
low risk |
Table 2: Sliding load (vertical surface)
MP 20x8/4x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.33 kg / 2.93 LBS
1330.0 g / 13.0 N
|
| 1 mm | Stal (~0.2) |
1.16 kg / 2.56 LBS
1162.0 g / 11.4 N
|
| 2 mm | Stal (~0.2) |
0.97 kg / 2.14 LBS
970.0 g / 9.5 N
|
| 3 mm | Stal (~0.2) |
0.78 kg / 1.72 LBS
782.0 g / 7.7 N
|
| 5 mm | Stal (~0.2) |
0.47 kg / 1.03 LBS
468.0 g / 4.6 N
|
| 10 mm | Stal (~0.2) |
0.11 kg / 0.24 LBS
108.0 g / 1.1 N
|
| 15 mm | Stal (~0.2) |
0.03 kg / 0.06 LBS
26.0 g / 0.3 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) - vertical pull
MP 20x8/4x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
2.00 kg / 4.40 LBS
1995.0 g / 19.6 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.33 kg / 2.93 LBS
1330.0 g / 13.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.67 kg / 1.47 LBS
665.0 g / 6.5 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
3.33 kg / 7.33 LBS
3325.0 g / 32.6 N
|
Table 4: Material efficiency (substrate influence) - power losses
MP 20x8/4x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.67 kg / 1.47 LBS
665.0 g / 6.5 N
|
| 1 mm |
|
1.66 kg / 3.67 LBS
1662.5 g / 16.3 N
|
| 2 mm |
|
3.33 kg / 7.33 LBS
3325.0 g / 32.6 N
|
| 3 mm |
|
4.99 kg / 11.00 LBS
4987.5 g / 48.9 N
|
| 5 mm |
|
6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
|
| 10 mm |
|
6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
|
| 11 mm |
|
6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
|
| 12 mm |
|
6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
|
Table 5: Working in heat (stability) - power drop
MP 20x8/4x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
|
OK |
| 40 °C | -2.2% |
6.50 kg / 14.34 LBS
6503.7 g / 63.8 N
|
OK |
| 60 °C | -4.4% |
6.36 kg / 14.02 LBS
6357.4 g / 62.4 N
|
|
| 80 °C | -6.6% |
6.21 kg / 13.69 LBS
6211.1 g / 60.9 N
|
|
| 100 °C | -28.8% |
4.73 kg / 10.44 LBS
4734.8 g / 46.4 N
|
Table 6: Two magnets (attraction) - field range
MP 20x8/4x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
9.28 kg / 20.47 LBS
4 012 Gs
|
1.39 kg / 3.07 LBS
1393 g / 13.7 N
|
N/A |
| 1 mm |
8.73 kg / 19.25 LBS
4 701 Gs
|
1.31 kg / 2.89 LBS
1310 g / 12.8 N
|
7.86 kg / 17.33 LBS
~0 Gs
|
| 2 mm |
8.11 kg / 17.88 LBS
4 530 Gs
|
1.22 kg / 2.68 LBS
1216 g / 11.9 N
|
7.30 kg / 16.09 LBS
~0 Gs
|
| 3 mm |
7.45 kg / 16.42 LBS
4 342 Gs
|
1.12 kg / 2.46 LBS
1117 g / 11.0 N
|
6.70 kg / 14.78 LBS
~0 Gs
|
| 5 mm |
6.10 kg / 13.45 LBS
3 930 Gs
|
0.92 kg / 2.02 LBS
915 g / 9.0 N
|
5.49 kg / 12.11 LBS
~0 Gs
|
| 10 mm |
3.27 kg / 7.20 LBS
2 875 Gs
|
0.49 kg / 1.08 LBS
490 g / 4.8 N
|
2.94 kg / 6.48 LBS
~0 Gs
|
| 20 mm |
0.75 kg / 1.66 LBS
1 382 Gs
|
0.11 kg / 0.25 LBS
113 g / 1.1 N
|
0.68 kg / 1.50 LBS
~0 Gs
|
| 50 mm |
0.02 kg / 0.04 LBS
220 Gs
|
0.00 kg / 0.01 LBS
3 g / 0.0 N
|
0.02 kg / 0.04 LBS
~0 Gs
|
| 60 mm |
0.01 kg / 0.02 LBS
139 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 70 mm |
0.00 kg / 0.01 LBS
93 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 LBS
65 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 LBS
47 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 LBS
35 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
MP 20x8/4x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 8.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 6.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 5.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 4.0 cm |
| Remote | 50 Gs (5.0 mT) | 3.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Dynamics (cracking risk) - warning
MP 20x8/4x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
25.67 km/h
(7.13 m/s)
|
0.29 J | |
| 30 mm |
42.38 km/h
(11.77 m/s)
|
0.78 J | |
| 50 mm |
54.68 km/h
(15.19 m/s)
|
1.30 J | |
| 100 mm |
77.33 km/h
(21.48 m/s)
|
2.61 J |
Table 9: Anti-corrosion coating durability
MP 20x8/4x5 / 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 20x8/4x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 7 218 Mx | 72.2 µWb |
| Pc Coefficient | 0.31 | Low (Flat) |
Table 11: Submerged application
MP 20x8/4x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 6.65 kg | Standard |
| Water (riverbed) |
7.61 kg
(+0.96 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Caution: On a vertical wall, the magnet retains merely a fraction of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) significantly limits the holding force.
3. Heat tolerance
*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) = 0.31
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros and cons of Nd2Fe14B magnets.
Pros
- They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
- They do not lose their magnetic properties even under external field action,
- In other words, due to the aesthetic finish of gold, the element looks attractive,
- They are known for high magnetic induction at the operating surface, making them more effective,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Thanks to flexibility in constructing and the capacity to modify to individual projects,
- Fundamental importance in electronics industry – they are used in magnetic memories, electric drive systems, diagnostic systems, as well as industrial machines.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Cons
- At very strong impacts they can break, therefore we recommend placing them in steel cases. 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.
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- Due to limitations in producing nuts and complex shapes in magnets, we recommend using casing - magnetic holder.
- Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Additionally, small components of these products can disrupt the diagnostic process medical after entering the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities
Holding force characteristics
Maximum magnetic pulling force – what it depends on?
- on a block made of structural steel, effectively closing the magnetic field
- whose transverse dimension equals approx. 10 mm
- with a plane cleaned and smooth
- without the slightest air gap between the magnet and steel
- for force acting at a right angle (in the magnet axis)
- at ambient temperature room level
Determinants of practical lifting force of a magnet
- Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of nominal force).
- Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
- Chemical composition of the base – mild steel attracts best. Higher carbon content lower magnetic properties and holding force.
- Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
- Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.
Lifting capacity was measured with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.
Precautions when working with NdFeB magnets
Flammability
Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.
Life threat
For implant holders: Powerful magnets affect electronics. Maintain at least 30 cm distance or request help to work with the magnets.
Electronic devices
Intense magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.
Metal Allergy
Some people have a contact allergy to nickel, which is the standard coating for neodymium magnets. Frequent touching may cause a rash. We suggest use safety gloves.
Choking Hazard
Strictly store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets connecting inside the body are fatal.
Hand protection
Large magnets can smash fingers in a fraction of a second. Under no circumstances place your hand betwixt two strong magnets.
Immense force
Before use, read the rules. Sudden snapping can destroy the magnet or injure your hand. Be predictive.
Keep away from electronics
Be aware: rare earth magnets generate a field that disrupts sensitive sensors. Maintain a safe distance from your phone, device, and navigation systems.
Protective goggles
Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.
Permanent damage
Control the heat. Exposing the magnet to high heat will permanently weaken its properties and pulling force.
