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
bulk discounts:
Need more?Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Product card - 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 simulation of the assembly - technical parameters
These information represent the direct effect of a physical analysis. Values were calculated on models for the class Nd2Fe14B. Real-world performance may deviate from the simulation results. Please consider these calculations as a supplementary guide for designers.
Table 1: Static pull force (pull vs distance) - power drop
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: Shear load (wall)
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: Wall mounting (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: Steel thickness (saturation) - 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: Thermal resistance (material behavior) - 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: Magnet-Magnet interaction (attraction) - forces in the system
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: Hazards (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: Collisions (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: Electrical 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: Hydrostatics and buoyancy
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. Sliding resistance
*Caution: On a vertical surface, the magnet holds merely a fraction of its max power.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Thermal stability
*For N38 grade, the safety limit 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.
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 |
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Pros and cons of neodymium magnets.
Strengths
- They have stable power, and over around ten years their attraction force decreases symbolically – ~1% (according to theory),
- They retain their magnetic properties even under external field action,
- In other words, due to the glossy surface of gold, the element gains a professional look,
- Neodymium magnets ensure maximum magnetic induction on a small area, which allows for strong attraction,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
- Thanks to modularity in designing and the capacity to adapt to complex applications,
- Fundamental importance in modern technologies – they are used in magnetic memories, electric motors, diagnostic systems, also modern systems.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Limitations
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
- NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
- We recommend a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated forms.
- Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that small components of these magnets are able to disrupt the diagnostic process medical when they are in 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
Detachment force of the magnet in optimal conditions – what contributes to it?
- with the contact of a yoke made of low-carbon steel, ensuring full magnetic saturation
- possessing a thickness of at least 10 mm to ensure full flux closure
- with an polished contact surface
- with total lack of distance (without paint)
- for force acting at a right angle (pull-off, not shear)
- in neutral thermal conditions
Lifting capacity in practice – influencing factors
- Distance (between the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, rust or debris).
- Load vector – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
- Plate material – low-carbon steel attracts best. Alloy steels decrease magnetic permeability and holding force.
- Smoothness – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
- Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity was measured using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate decreases the lifting capacity.
Precautions when working with NdFeB magnets
Allergy Warning
Certain individuals suffer from a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Frequent touching may cause dermatitis. We strongly advise wear protective gloves.
Bone fractures
Pinching hazard: The attraction force is so immense that it can cause blood blisters, pinching, and broken bones. Use thick gloves.
Shattering risk
Protect your eyes. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.
GPS and phone interference
A powerful magnetic field negatively affects the operation of magnetometers in smartphones and GPS navigation. Keep magnets close to a device to prevent damaging the sensors.
Electronic devices
Very strong magnetic fields can erase data on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.
ICD Warning
Patients with a ICD have to maintain an safe separation from magnets. The magnetic field can disrupt the operation of the implant.
Fire warning
Drilling and cutting of NdFeB material carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.
Caution required
Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.
This is not a toy
Neodymium magnets are not suitable for play. Swallowing several magnets can lead to them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.
Operating temperature
Avoid heat. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).
