MP 14x8/4x3 / N38 - ring magnet
ring magnet
Catalog no 030181
GTIN/EAN: 5906301811985
Diameter
14 mm [±0,1 mm]
internal diameter Ø
8/4 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
3.18 g
Magnetization Direction
↑ axial
Load capacity
2.53 kg / 24.85 N
Magnetic Induction
244.11 mT / 2441 Gs
Coating
[NiCuNi] Nickel
2.47 ZŁ with VAT / pcs + price for transport
2.01 ZŁ net + 23% VAT / pcs
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Technical - MP 14x8/4x3 / N38 - ring magnet
Specification / characteristics - MP 14x8/4x3 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030181 |
| GTIN/EAN | 5906301811985 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 14 mm [±0,1 mm] |
| internal diameter Ø | 8/4 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 3.18 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.53 kg / 24.85 N |
| Magnetic Induction ~ ? | 244.11 mT / 2441 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 analysis of the product - data
Presented information represent the result of a mathematical simulation. Values are based on models for the class Nd2Fe14B. Real-world parameters may differ from theoretical values. Use these calculations as a preliminary roadmap during assembly planning.
Table 1: Static pull force (pull vs distance) - power drop
MP 14x8/4x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2121 Gs
212.1 mT
|
2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
|
strong |
| 1 mm |
1927 Gs
192.7 mT
|
2.09 kg / 4.61 pounds
2090.1 g / 20.5 N
|
strong |
| 2 mm |
1676 Gs
167.6 mT
|
1.58 kg / 3.48 pounds
1579.6 g / 15.5 N
|
safe |
| 3 mm |
1410 Gs
141.0 mT
|
1.12 kg / 2.46 pounds
1117.9 g / 11.0 N
|
safe |
| 5 mm |
943 Gs
94.3 mT
|
0.50 kg / 1.10 pounds
500.1 g / 4.9 N
|
safe |
| 10 mm |
335 Gs
33.5 mT
|
0.06 kg / 0.14 pounds
63.3 g / 0.6 N
|
safe |
| 15 mm |
140 Gs
14.0 mT
|
0.01 kg / 0.02 pounds
11.1 g / 0.1 N
|
safe |
| 20 mm |
69 Gs
6.9 mT
|
0.00 kg / 0.01 pounds
2.7 g / 0.0 N
|
safe |
| 30 mm |
24 Gs
2.4 mT
|
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
|
safe |
| 50 mm |
6 Gs
0.6 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Sliding hold (vertical surface)
MP 14x8/4x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.51 kg / 1.12 pounds
506.0 g / 5.0 N
|
| 1 mm | Stal (~0.2) |
0.42 kg / 0.92 pounds
418.0 g / 4.1 N
|
| 2 mm | Stal (~0.2) |
0.32 kg / 0.70 pounds
316.0 g / 3.1 N
|
| 3 mm | Stal (~0.2) |
0.22 kg / 0.49 pounds
224.0 g / 2.2 N
|
| 5 mm | Stal (~0.2) |
0.10 kg / 0.22 pounds
100.0 g / 1.0 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
12.0 g / 0.1 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 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) - behavior on slippery surfaces
MP 14x8/4x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.76 kg / 1.67 pounds
759.0 g / 7.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.51 kg / 1.12 pounds
506.0 g / 5.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.25 kg / 0.56 pounds
253.0 g / 2.5 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.27 kg / 2.79 pounds
1265.0 g / 12.4 N
|
Table 4: Steel thickness (saturation) - power losses
MP 14x8/4x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.25 kg / 0.56 pounds
253.0 g / 2.5 N
|
| 1 mm |
|
0.63 kg / 1.39 pounds
632.5 g / 6.2 N
|
| 2 mm |
|
1.27 kg / 2.79 pounds
1265.0 g / 12.4 N
|
| 3 mm |
|
1.90 kg / 4.18 pounds
1897.5 g / 18.6 N
|
| 5 mm |
|
2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
|
| 10 mm |
|
2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
|
| 11 mm |
|
2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
|
| 12 mm |
|
2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
|
Table 5: Thermal resistance (material behavior) - resistance threshold
MP 14x8/4x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.53 kg / 5.58 pounds
2530.0 g / 24.8 N
|
OK |
| 40 °C | -2.2% |
2.47 kg / 5.45 pounds
2474.3 g / 24.3 N
|
OK |
| 60 °C | -4.4% |
2.42 kg / 5.33 pounds
2418.7 g / 23.7 N
|
|
| 80 °C | -6.6% |
2.36 kg / 5.21 pounds
2363.0 g / 23.2 N
|
|
| 100 °C | -28.8% |
1.80 kg / 3.97 pounds
1801.4 g / 17.7 N
|
Table 6: Two magnets (repulsion) - field range
MP 14x8/4x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
3.33 kg / 7.34 pounds
3 647 Gs
|
0.50 kg / 1.10 pounds
500 g / 4.9 N
|
N/A |
| 1 mm |
3.07 kg / 6.76 pounds
4 070 Gs
|
0.46 kg / 1.01 pounds
460 g / 4.5 N
|
2.76 kg / 6.09 pounds
~0 Gs
|
| 2 mm |
2.75 kg / 6.07 pounds
3 855 Gs
|
0.41 kg / 0.91 pounds
413 g / 4.0 N
|
2.48 kg / 5.46 pounds
~0 Gs
|
| 3 mm |
2.42 kg / 5.33 pounds
3 612 Gs
|
0.36 kg / 0.80 pounds
362 g / 3.6 N
|
2.17 kg / 4.79 pounds
~0 Gs
|
| 5 mm |
1.76 kg / 3.88 pounds
3 084 Gs
|
0.26 kg / 0.58 pounds
264 g / 2.6 N
|
1.59 kg / 3.50 pounds
~0 Gs
|
| 10 mm |
0.66 kg / 1.45 pounds
1 886 Gs
|
0.10 kg / 0.22 pounds
99 g / 1.0 N
|
0.59 kg / 1.31 pounds
~0 Gs
|
| 20 mm |
0.08 kg / 0.18 pounds
671 Gs
|
0.01 kg / 0.03 pounds
13 g / 0.1 N
|
0.08 kg / 0.17 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
77 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
47 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
31 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
21 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
15 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
11 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
MP 14x8/4x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 5.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 3.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.5 cm |
| Remote | 50 Gs (5.0 mT) | 2.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Collisions (kinetic energy) - collision effects
MP 14x8/4x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
28.89 km/h
(8.02 m/s)
|
0.10 J | |
| 30 mm |
49.27 km/h
(13.69 m/s)
|
0.30 J | |
| 50 mm |
63.61 km/h
(17.67 m/s)
|
0.50 J | |
| 100 mm |
89.96 km/h
(24.99 m/s)
|
0.99 J |
Table 9: Anti-corrosion coating durability
MP 14x8/4x3 / 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 (Flux)
MP 14x8/4x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 3 101 Mx | 31.0 µWb |
| Pc Coefficient | 0.28 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MP 14x8/4x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.53 kg | Standard |
| Water (riverbed) |
2.90 kg
(+0.37 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical wall, the magnet retains just approx. 20-30% of its max power.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) severely weakens the holding force.
3. Thermal stability
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.28
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% |
Environmental data
| 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.
Advantages
- They have constant strength, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
- Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
- By covering with a lustrous layer of nickel, the element has an elegant look,
- The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Thanks to flexibility in designing and the ability to customize to complex applications,
- Fundamental importance in future technologies – they serve a role in data components, electromotive mechanisms, precision medical tools, also other advanced devices.
- Thanks to their power density, small magnets offer high operating force, with minimal size,
Disadvantages
- At 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.
- NdFeB magnets lose strength 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 very resistant to heat
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
- Limited possibility of creating threads in the magnet and complicated forms - preferred is a housing - mounting mechanism.
- Health risk to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small components of these devices can be problematic in diagnostics medical in case of swallowing.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities
Holding force characteristics
Maximum lifting capacity of the magnet – what it depends on?
- using a plate made of low-carbon steel, functioning as a magnetic yoke
- possessing a massiveness of minimum 10 mm to avoid saturation
- with an ground touching surface
- with direct contact (no impurities)
- during detachment in a direction vertical to the mounting surface
- at conditions approx. 20°C
Determinants of practical lifting force of a magnet
- Clearance – existence of foreign body (paint, tape, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
- Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
- Steel thickness – too thin sheet does not close the flux, causing part of the power to be escaped to the other side.
- Steel grade – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
- Surface finish – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
- Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.
Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate decreases the lifting capacity.
Safe handling of NdFeB magnets
Pacemakers
Warning for patients: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or request help to work with the magnets.
Powerful field
Handle magnets with awareness. Their powerful strength can surprise even professionals. Plan your moves and respect their power.
Magnetic media
Avoid bringing magnets near a wallet, laptop, or screen. The magnetic field can permanently damage these devices and wipe information from cards.
Magnets are brittle
Beware of splinters. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.
GPS and phone interference
Be aware: neodymium magnets generate a field that interferes with sensitive sensors. Maintain a separation from your mobile, device, and GPS.
Allergy Warning
A percentage of the population have a contact allergy to Ni, which is the common plating for neodymium magnets. Extended handling can result in skin redness. We recommend wear protective gloves.
Dust is flammable
Fire warning: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.
Thermal limits
Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.
Adults only
Always store magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are tragic.
Crushing force
Watch your fingers. Two powerful magnets will snap together instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!
