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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Product card - 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 magnet - report
These values are the outcome of a physical simulation. Results were calculated on models for the class Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Use these calculations as a reference point when designing systems.
Table 1: Static force (force 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 lbs
2530.0 g / 24.8 N
|
medium risk |
| 1 mm |
1927 Gs
192.7 mT
|
2.09 kg / 4.61 lbs
2090.1 g / 20.5 N
|
medium risk |
| 2 mm |
1676 Gs
167.6 mT
|
1.58 kg / 3.48 lbs
1579.6 g / 15.5 N
|
safe |
| 3 mm |
1410 Gs
141.0 mT
|
1.12 kg / 2.46 lbs
1117.9 g / 11.0 N
|
safe |
| 5 mm |
943 Gs
94.3 mT
|
0.50 kg / 1.10 lbs
500.1 g / 4.9 N
|
safe |
| 10 mm |
335 Gs
33.5 mT
|
0.06 kg / 0.14 lbs
63.3 g / 0.6 N
|
safe |
| 15 mm |
140 Gs
14.0 mT
|
0.01 kg / 0.02 lbs
11.1 g / 0.1 N
|
safe |
| 20 mm |
69 Gs
6.9 mT
|
0.00 kg / 0.01 lbs
2.7 g / 0.0 N
|
safe |
| 30 mm |
24 Gs
2.4 mT
|
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
|
safe |
| 50 mm |
6 Gs
0.6 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
Table 2: Slippage capacity (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 lbs
506.0 g / 5.0 N
|
| 1 mm | Stal (~0.2) |
0.42 kg / 0.92 lbs
418.0 g / 4.1 N
|
| 2 mm | Stal (~0.2) |
0.32 kg / 0.70 lbs
316.0 g / 3.1 N
|
| 3 mm | Stal (~0.2) |
0.22 kg / 0.49 lbs
224.0 g / 2.2 N
|
| 5 mm | Stal (~0.2) |
0.10 kg / 0.22 lbs
100.0 g / 1.0 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.03 lbs
12.0 g / 0.1 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 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) - 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 lbs
759.0 g / 7.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.51 kg / 1.12 lbs
506.0 g / 5.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.25 kg / 0.56 lbs
253.0 g / 2.5 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.27 kg / 2.79 lbs
1265.0 g / 12.4 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MP 14x8/4x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.25 kg / 0.56 lbs
253.0 g / 2.5 N
|
| 1 mm |
|
0.63 kg / 1.39 lbs
632.5 g / 6.2 N
|
| 2 mm |
|
1.27 kg / 2.79 lbs
1265.0 g / 12.4 N
|
| 3 mm |
|
1.90 kg / 4.18 lbs
1897.5 g / 18.6 N
|
| 5 mm |
|
2.53 kg / 5.58 lbs
2530.0 g / 24.8 N
|
| 10 mm |
|
2.53 kg / 5.58 lbs
2530.0 g / 24.8 N
|
| 11 mm |
|
2.53 kg / 5.58 lbs
2530.0 g / 24.8 N
|
| 12 mm |
|
2.53 kg / 5.58 lbs
2530.0 g / 24.8 N
|
Table 5: Thermal stability (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 lbs
2530.0 g / 24.8 N
|
OK |
| 40 °C | -2.2% |
2.47 kg / 5.45 lbs
2474.3 g / 24.3 N
|
OK |
| 60 °C | -4.4% |
2.42 kg / 5.33 lbs
2418.7 g / 23.7 N
|
|
| 80 °C | -6.6% |
2.36 kg / 5.21 lbs
2363.0 g / 23.2 N
|
|
| 100 °C | -28.8% |
1.80 kg / 3.97 lbs
1801.4 g / 17.7 N
|
Table 6: Two magnets (attraction) - field range
MP 14x8/4x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
3.33 kg / 7.34 lbs
3 647 Gs
|
0.50 kg / 1.10 lbs
500 g / 4.9 N
|
N/A |
| 1 mm |
3.07 kg / 6.76 lbs
4 070 Gs
|
0.46 kg / 1.01 lbs
460 g / 4.5 N
|
2.76 kg / 6.09 lbs
~0 Gs
|
| 2 mm |
2.75 kg / 6.07 lbs
3 855 Gs
|
0.41 kg / 0.91 lbs
413 g / 4.0 N
|
2.48 kg / 5.46 lbs
~0 Gs
|
| 3 mm |
2.42 kg / 5.33 lbs
3 612 Gs
|
0.36 kg / 0.80 lbs
362 g / 3.6 N
|
2.17 kg / 4.79 lbs
~0 Gs
|
| 5 mm |
1.76 kg / 3.88 lbs
3 084 Gs
|
0.26 kg / 0.58 lbs
264 g / 2.6 N
|
1.59 kg / 3.50 lbs
~0 Gs
|
| 10 mm |
0.66 kg / 1.45 lbs
1 886 Gs
|
0.10 kg / 0.22 lbs
99 g / 1.0 N
|
0.59 kg / 1.31 lbs
~0 Gs
|
| 20 mm |
0.08 kg / 0.18 lbs
671 Gs
|
0.01 kg / 0.03 lbs
13 g / 0.1 N
|
0.08 kg / 0.17 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
77 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 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
|
| 70 mm |
0.00 kg / 0.00 lbs
31 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 lbs
21 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
15 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
11 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Protective zones (implants) - 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 |
| Timepiece | 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 (cracking risk) - 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: Corrosion resistance
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 (Pc)
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. Sliding resistance
*Warning: On a vertical surface, the magnet retains only ~20% of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) significantly limits the holding force.
3. Heat tolerance
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.28
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 |
Other products
Strengths and weaknesses of neodymium magnets.
Pros
- They virtually do not lose power, because even after ten years the performance loss is only ~1% (based on calculations),
- They maintain their magnetic properties even under external field action,
- By covering with a decorative layer of silver, the element has an modern look,
- The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Possibility of precise machining as well as adapting to precise requirements,
- Key role in advanced technology sectors – they find application in HDD drives, electric drive systems, medical devices, as well as modern systems.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Disadvantages
- Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- Due to limitations in creating threads and complicated shapes in magnets, we propose using casing - magnetic mechanism.
- Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small elements of these products can complicate diagnosis medical in case of swallowing.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities
Lifting parameters
Detachment force of the magnet in optimal conditions – what affects it?
- on a plate made of mild steel, perfectly concentrating the magnetic field
- whose thickness equals approx. 10 mm
- characterized by lack of roughness
- with total lack of distance (no paint)
- during detachment in a direction perpendicular to the plane
- at temperature room level
Lifting capacity in practice – influencing factors
- Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
- Load vector – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
- Steel thickness – too thin sheet does not accept the full field, causing part of the power to be wasted to the other side.
- Material type – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
- Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
- Temperature – temperature increase results in weakening of force. Check the thermal limit for a given model.
Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate decreases the holding force.
Warnings
Power loss in heat
Regular neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. The loss of strength is permanent.
Keep away from computers
Powerful magnetic fields can corrupt files on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.
Warning for allergy sufferers
Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction happens, immediately stop working with magnets and use protective gear.
Caution required
Handle magnets with awareness. Their huge power can surprise even experienced users. Stay alert and respect their force.
Implant safety
Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.
Protective goggles
Protect your eyes. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.
Fire warning
Machining of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Hand protection
Large magnets can break fingers in a fraction of a second. Never put your hand betwixt two attracting surfaces.
Threat to navigation
An intense magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Do not bring magnets close to a device to prevent damaging the sensors.
Product not for children
Product intended for adults. Tiny parts pose a choking risk, causing intestinal necrosis. Keep away from children and animals.
