MP 16x12x2 / N38 - ring magnet
ring magnet
Catalog no 030183
GTIN/EAN: 5906301812005
Diameter
16 mm [±0,1 mm]
internal diameter Ø
12 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
1.32 g
Magnetization Direction
↑ axial
Load capacity
0.68 kg / 6.62 N
Magnetic Induction
150.33 mT / 1503 Gs
Coating
[NiCuNi] Nickel
1.304 ZŁ with VAT / pcs + price for transport
1.060 ZŁ net + 23% VAT / pcs
bulk discounts:
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Physical properties - MP 16x12x2 / N38 - ring magnet
Specification / characteristics - MP 16x12x2 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030183 |
| GTIN/EAN | 5906301812005 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 16 mm [±0,1 mm] |
| internal diameter Ø | 12 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 1.32 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.68 kg / 6.62 N |
| Magnetic Induction ~ ? | 150.33 mT / 1503 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 |
Engineering simulation of the product - data
The following information constitute the outcome of a physical calculation. Values are based on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Treat these calculations as a preliminary roadmap for designers.
Table 1: Static force (force vs distance) - characteristics
MP 16x12x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6011 Gs
601.1 mT
|
0.68 kg / 1.50 pounds
680.0 g / 6.7 N
|
safe |
| 1 mm |
5259 Gs
525.9 mT
|
0.52 kg / 1.15 pounds
520.7 g / 5.1 N
|
safe |
| 2 mm |
4534 Gs
453.4 mT
|
0.39 kg / 0.85 pounds
387.0 g / 3.8 N
|
safe |
| 3 mm |
3870 Gs
387.0 mT
|
0.28 kg / 0.62 pounds
281.9 g / 2.8 N
|
safe |
| 5 mm |
2776 Gs
277.6 mT
|
0.15 kg / 0.32 pounds
145.1 g / 1.4 N
|
safe |
| 10 mm |
1251 Gs
125.1 mT
|
0.03 kg / 0.06 pounds
29.4 g / 0.3 N
|
safe |
| 15 mm |
643 Gs
64.3 mT
|
0.01 kg / 0.02 pounds
7.8 g / 0.1 N
|
safe |
| 20 mm |
372 Gs
37.2 mT
|
0.00 kg / 0.01 pounds
2.6 g / 0.0 N
|
safe |
| 30 mm |
159 Gs
15.9 mT
|
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
|
safe |
| 50 mm |
49 Gs
4.9 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Shear force (vertical surface)
MP 16x12x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.14 kg / 0.30 pounds
136.0 g / 1.3 N
|
| 1 mm | Stal (~0.2) |
0.10 kg / 0.23 pounds
104.0 g / 1.0 N
|
| 2 mm | Stal (~0.2) |
0.08 kg / 0.17 pounds
78.0 g / 0.8 N
|
| 3 mm | Stal (~0.2) |
0.06 kg / 0.12 pounds
56.0 g / 0.5 N
|
| 5 mm | Stal (~0.2) |
0.03 kg / 0.07 pounds
30.0 g / 0.3 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.01 pounds
6.0 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: Wall mounting (shearing) - vertical pull
MP 16x12x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.20 kg / 0.45 pounds
204.0 g / 2.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.14 kg / 0.30 pounds
136.0 g / 1.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.07 kg / 0.15 pounds
68.0 g / 0.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 16x12x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.07 kg / 0.15 pounds
68.0 g / 0.7 N
|
| 1 mm |
|
0.17 kg / 0.37 pounds
170.0 g / 1.7 N
|
| 2 mm |
|
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
|
| 3 mm |
|
0.51 kg / 1.12 pounds
510.0 g / 5.0 N
|
| 5 mm |
|
0.68 kg / 1.50 pounds
680.0 g / 6.7 N
|
| 10 mm |
|
0.68 kg / 1.50 pounds
680.0 g / 6.7 N
|
| 11 mm |
|
0.68 kg / 1.50 pounds
680.0 g / 6.7 N
|
| 12 mm |
|
0.68 kg / 1.50 pounds
680.0 g / 6.7 N
|
Table 5: Thermal stability (material behavior) - thermal limit
MP 16x12x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.68 kg / 1.50 pounds
680.0 g / 6.7 N
|
OK |
| 40 °C | -2.2% |
0.67 kg / 1.47 pounds
665.0 g / 6.5 N
|
OK |
| 60 °C | -4.4% |
0.65 kg / 1.43 pounds
650.1 g / 6.4 N
|
OK |
| 80 °C | -6.6% |
0.64 kg / 1.40 pounds
635.1 g / 6.2 N
|
|
| 100 °C | -28.8% |
0.48 kg / 1.07 pounds
484.2 g / 4.7 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 16x12x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
37.47 kg / 82.60 pounds
6 145 Gs
|
5.62 kg / 12.39 pounds
5620 g / 55.1 N
|
N/A |
| 1 mm |
32.95 kg / 72.65 pounds
11 273 Gs
|
4.94 kg / 10.90 pounds
4943 g / 48.5 N
|
29.66 kg / 65.38 pounds
~0 Gs
|
| 2 mm |
28.69 kg / 63.25 pounds
10 519 Gs
|
4.30 kg / 9.49 pounds
4303 g / 42.2 N
|
25.82 kg / 56.92 pounds
~0 Gs
|
| 3 mm |
24.81 kg / 54.69 pounds
9 781 Gs
|
3.72 kg / 8.20 pounds
3721 g / 36.5 N
|
22.33 kg / 49.22 pounds
~0 Gs
|
| 5 mm |
18.24 kg / 40.20 pounds
8 386 Gs
|
2.74 kg / 6.03 pounds
2735 g / 26.8 N
|
16.41 kg / 36.18 pounds
~0 Gs
|
| 10 mm |
7.99 kg / 17.62 pounds
5 552 Gs
|
1.20 kg / 2.64 pounds
1199 g / 11.8 N
|
7.19 kg / 15.86 pounds
~0 Gs
|
| 20 mm |
1.62 kg / 3.58 pounds
2 501 Gs
|
0.24 kg / 0.54 pounds
243 g / 2.4 N
|
1.46 kg / 3.22 pounds
~0 Gs
|
| 50 mm |
0.06 kg / 0.13 pounds
471 Gs
|
0.01 kg / 0.02 pounds
9 g / 0.1 N
|
0.05 kg / 0.11 pounds
~0 Gs
|
| 60 mm |
0.03 kg / 0.06 pounds
318 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
| 70 mm |
0.01 kg / 0.03 pounds
225 Gs
|
0.00 kg / 0.00 pounds
2 g / 0.0 N
|
0.01 kg / 0.03 pounds
~0 Gs
|
| 80 mm |
0.01 kg / 0.02 pounds
166 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.01 pounds
126 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.01 pounds
98 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Hazards (implants) - precautionary measures
MP 16x12x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 12.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 9.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 7.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 5.5 cm |
| Remote | 50 Gs (5.0 mT) | 5.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.0 cm |
Table 8: Dynamics (cracking risk) - warning
MP 16x12x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
23.50 km/h
(6.53 m/s)
|
0.03 J | |
| 30 mm |
39.66 km/h
(11.02 m/s)
|
0.08 J | |
| 50 mm |
51.19 km/h
(14.22 m/s)
|
0.13 J | |
| 100 mm |
72.39 km/h
(20.11 m/s)
|
0.27 J |
Table 9: Corrosion resistance
MP 16x12x2 / 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 16x12x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 11 219 Mx | 112.2 µWb |
| Pc Coefficient | 1.22 | High (Stable) |
Table 11: Physics of underwater searching
MP 16x12x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.68 kg | Standard |
| Water (riverbed) |
0.78 kg
(+0.10 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Caution: On a vertical surface, the magnet holds just ~20% of its max power.
2. Plate thickness effect
*Thin steel (e.g. 0.5mm PC case) severely reduces 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) = 1.22
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% |
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 as well as cons of Nd2Fe14B magnets.
Pros
- They do not lose magnetism, even after approximately ten years – the reduction in lifting capacity is only ~1% (based on measurements),
- Neodymium magnets prove to be exceptionally resistant to loss of magnetic properties caused by external magnetic fields,
- The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
- Neodymium magnets ensure maximum magnetic induction on a their surface, which allows for strong attraction,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Thanks to flexibility in constructing and the capacity to customize to client solutions,
- Fundamental importance in modern technologies – they serve a role in mass storage devices, electric motors, medical devices, as well as complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in compact constructions
Limitations
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
- Limited possibility of producing nuts in the magnet and complex forms - recommended is casing - magnet mounting.
- Health risk related to microscopic parts of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
- With large orders the cost of neodymium magnets is economically unviable,
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what affects it?
- using a plate made of high-permeability steel, functioning as a magnetic yoke
- with a thickness no less than 10 mm
- with an ground contact surface
- with total lack of distance (without impurities)
- for force applied at a right angle (pull-off, not shear)
- at temperature approx. 20 degrees Celsius
Lifting capacity in real conditions – factors
- Gap (between the magnet and the metal), since even a tiny clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
- Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
- Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Steel grade – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
- Base smoothness – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
- Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity was assessed with the use of a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.
Warnings
Do not drill into magnets
Drilling and cutting of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Choking Hazard
NdFeB magnets are not toys. Swallowing a few magnets can lead to them attracting across intestines, which constitutes a critical condition and necessitates immediate surgery.
Electronic hazard
Data protection: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).
Safe operation
Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.
Life threat
For implant holders: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.
Avoid contact if allergic
Studies show that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, refrain from touching magnets with bare hands or choose versions in plastic housing.
Crushing risk
Pinching hazard: The attraction force is so great that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.
Do not overheat magnets
Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. Damage is permanent.
Fragile material
NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets will cause them breaking into shards.
Impact on smartphones
An intense magnetic field disrupts the functioning of magnetometers in smartphones and GPS navigation. Do not bring magnets close to a device to avoid breaking the sensors.
