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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Technical parameters of the product - 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 |
Technical simulation of the product - data
The following values are the outcome of a engineering simulation. Results are based on algorithms for the class Nd2Fe14B. Actual conditions may differ. Please consider these data as a supplementary guide when designing systems.
Table 1: Static force (pull vs distance) - power drop
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 LBS
680.0 g / 6.7 N
|
low risk |
| 1 mm |
5259 Gs
525.9 mT
|
0.52 kg / 1.15 LBS
520.7 g / 5.1 N
|
low risk |
| 2 mm |
4534 Gs
453.4 mT
|
0.39 kg / 0.85 LBS
387.0 g / 3.8 N
|
low risk |
| 3 mm |
3870 Gs
387.0 mT
|
0.28 kg / 0.62 LBS
281.9 g / 2.8 N
|
low risk |
| 5 mm |
2776 Gs
277.6 mT
|
0.15 kg / 0.32 LBS
145.1 g / 1.4 N
|
low risk |
| 10 mm |
1251 Gs
125.1 mT
|
0.03 kg / 0.06 LBS
29.4 g / 0.3 N
|
low risk |
| 15 mm |
643 Gs
64.3 mT
|
0.01 kg / 0.02 LBS
7.8 g / 0.1 N
|
low risk |
| 20 mm |
372 Gs
37.2 mT
|
0.00 kg / 0.01 LBS
2.6 g / 0.0 N
|
low risk |
| 30 mm |
159 Gs
15.9 mT
|
0.00 kg / 0.00 LBS
0.5 g / 0.0 N
|
low risk |
| 50 mm |
49 Gs
4.9 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Sliding hold (wall)
MP 16x12x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.14 kg / 0.30 LBS
136.0 g / 1.3 N
|
| 1 mm | Stal (~0.2) |
0.10 kg / 0.23 LBS
104.0 g / 1.0 N
|
| 2 mm | Stal (~0.2) |
0.08 kg / 0.17 LBS
78.0 g / 0.8 N
|
| 3 mm | Stal (~0.2) |
0.06 kg / 0.12 LBS
56.0 g / 0.5 N
|
| 5 mm | Stal (~0.2) |
0.03 kg / 0.07 LBS
30.0 g / 0.3 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.01 LBS
6.0 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 (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 LBS
204.0 g / 2.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.14 kg / 0.30 LBS
136.0 g / 1.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.07 kg / 0.15 LBS
68.0 g / 0.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
|
Table 4: Steel thickness (substrate influence) - power losses
MP 16x12x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.07 kg / 0.15 LBS
68.0 g / 0.7 N
|
| 1 mm |
|
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
|
| 2 mm |
|
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
|
| 3 mm |
|
0.51 kg / 1.12 LBS
510.0 g / 5.0 N
|
| 5 mm |
|
0.68 kg / 1.50 LBS
680.0 g / 6.7 N
|
| 10 mm |
|
0.68 kg / 1.50 LBS
680.0 g / 6.7 N
|
| 11 mm |
|
0.68 kg / 1.50 LBS
680.0 g / 6.7 N
|
| 12 mm |
|
0.68 kg / 1.50 LBS
680.0 g / 6.7 N
|
Table 5: Working in heat (material behavior) - resistance threshold
MP 16x12x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.68 kg / 1.50 LBS
680.0 g / 6.7 N
|
OK |
| 40 °C | -2.2% |
0.67 kg / 1.47 LBS
665.0 g / 6.5 N
|
OK |
| 60 °C | -4.4% |
0.65 kg / 1.43 LBS
650.1 g / 6.4 N
|
OK |
| 80 °C | -6.6% |
0.64 kg / 1.40 LBS
635.1 g / 6.2 N
|
|
| 100 °C | -28.8% |
0.48 kg / 1.07 LBS
484.2 g / 4.7 N
|
Table 6: Two magnets (attraction) - field collision
MP 16x12x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
37.47 kg / 82.60 LBS
6 145 Gs
|
5.62 kg / 12.39 LBS
5620 g / 55.1 N
|
N/A |
| 1 mm |
32.95 kg / 72.65 LBS
11 273 Gs
|
4.94 kg / 10.90 LBS
4943 g / 48.5 N
|
29.66 kg / 65.38 LBS
~0 Gs
|
| 2 mm |
28.69 kg / 63.25 LBS
10 519 Gs
|
4.30 kg / 9.49 LBS
4303 g / 42.2 N
|
25.82 kg / 56.92 LBS
~0 Gs
|
| 3 mm |
24.81 kg / 54.69 LBS
9 781 Gs
|
3.72 kg / 8.20 LBS
3721 g / 36.5 N
|
22.33 kg / 49.22 LBS
~0 Gs
|
| 5 mm |
18.24 kg / 40.20 LBS
8 386 Gs
|
2.74 kg / 6.03 LBS
2735 g / 26.8 N
|
16.41 kg / 36.18 LBS
~0 Gs
|
| 10 mm |
7.99 kg / 17.62 LBS
5 552 Gs
|
1.20 kg / 2.64 LBS
1199 g / 11.8 N
|
7.19 kg / 15.86 LBS
~0 Gs
|
| 20 mm |
1.62 kg / 3.58 LBS
2 501 Gs
|
0.24 kg / 0.54 LBS
243 g / 2.4 N
|
1.46 kg / 3.22 LBS
~0 Gs
|
| 50 mm |
0.06 kg / 0.13 LBS
471 Gs
|
0.01 kg / 0.02 LBS
9 g / 0.1 N
|
0.05 kg / 0.11 LBS
~0 Gs
|
| 60 mm |
0.03 kg / 0.06 LBS
318 Gs
|
0.00 kg / 0.01 LBS
4 g / 0.0 N
|
0.02 kg / 0.05 LBS
~0 Gs
|
| 70 mm |
0.01 kg / 0.03 LBS
225 Gs
|
0.00 kg / 0.00 LBS
2 g / 0.0 N
|
0.01 kg / 0.03 LBS
~0 Gs
|
| 80 mm |
0.01 kg / 0.02 LBS
166 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 90 mm |
0.00 kg / 0.01 LBS
126 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 100 mm |
0.00 kg / 0.01 LBS
98 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 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 |
| Timepiece | 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: Impact energy (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: Coating parameters (durability)
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: Underwater work (magnet fishing)
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. Wall mount (shear)
*Caution: On a vertical surface, the magnet holds merely a fraction of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. computer case) drastically reduces the holding force.
3. Heat tolerance
*For N38 grade, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.22
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.
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 rare earth magnets.
Strengths
- They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
- Neodymium magnets prove to be highly resistant to magnetic field loss caused by external magnetic fields,
- In other words, due to the reflective finish of nickel, the element gains visual value,
- Magnetic induction on the top side of the magnet is impressive,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
- Thanks to the potential of precise forming and customization to custom requirements, neodymium magnets can be modeled in a broad palette of geometric configurations, which makes them more universal,
- Key role in electronics industry – they are utilized in HDD drives, electric drive systems, precision medical tools, and complex engineering applications.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Limitations
- Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their 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.
- They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Due to limitations in realizing threads and complex forms in magnets, we propose using cover - magnetic holder.
- Health risk resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small elements of these magnets can disrupt the diagnostic process medical after entering the body.
- Due to neodymium price, their price is higher than average,
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what affects it?
- using a sheet made of low-carbon steel, acting as a magnetic yoke
- whose transverse dimension equals approx. 10 mm
- with a surface perfectly flat
- under conditions of no distance (surface-to-surface)
- for force applied at a right angle (pull-off, not shear)
- at standard ambient temperature
What influences lifting capacity in practice
- Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
- Load vector – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
- Metal type – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
- Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
- Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).
Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.
H&S for magnets
Handling guide
Before use, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.
Precision electronics
An intense magnetic field negatively affects the functioning of magnetometers in phones and GPS navigation. Do not bring magnets close to a device to avoid breaking the sensors.
Heat sensitivity
Watch the temperature. Exposing the magnet to high heat will destroy its magnetic structure and strength.
Danger to pacemakers
Individuals with a heart stimulator should maintain an safe separation from magnets. The magnetic field can stop the functioning of the life-saving device.
Safe distance
Device Safety: Strong magnets can ruin data carriers and delicate electronics (pacemakers, hearing aids, timepieces).
No play value
Absolutely store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are tragic.
Fire warning
Fire hazard: Neodymium dust is explosive. Do not process magnets in home conditions as this risks ignition.
Hand protection
Large magnets can break fingers in a fraction of a second. Under no circumstances put your hand between two attracting surfaces.
Allergy Warning
A percentage of the population have a sensitization to nickel, which is the common plating for neodymium magnets. Frequent touching might lead to dermatitis. It is best to wear safety gloves.
Magnet fragility
Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
