MP 36.2x11/6x7.5 / N38 - ring magnet
ring magnet
Catalog no 030248
GTIN/EAN: 5906301812241
Diameter
36.2 mm [±0,1 mm]
internal diameter Ø
11/6 mm [±0,1 mm]
Height
7.5 mm [±0,1 mm]
Weight
56.3 g
Magnetization Direction
↑ axial
Load capacity
17.12 kg / 167.95 N
Magnetic Induction
237.29 mT / 2373 Gs
Coating
[NiCuNi] Nickel
35.01 ZŁ with VAT / pcs + price for transport
28.46 ZŁ net + 23% VAT / pcs
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Technical of the product - MP 36.2x11/6x7.5 / N38 - ring magnet
Specification / characteristics - MP 36.2x11/6x7.5 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030248 |
| GTIN/EAN | 5906301812241 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 36.2 mm [±0,1 mm] |
| internal diameter Ø | 11/6 mm [±0,1 mm] |
| Height | 7.5 mm [±0,1 mm] |
| Weight | 56.3 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 17.12 kg / 167.95 N |
| Magnetic Induction ~ ? | 237.29 mT / 2373 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 analysis of the assembly - data
These data represent the direct effect of a engineering analysis. Values are based on algorithms for the class Nd2Fe14B. Operational performance might slightly differ from theoretical values. Please consider these data as a supplementary guide when designing systems.
Table 1: Static force (pull vs gap) - interaction chart
MP 36.2x11/6x7.5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2059 Gs
205.9 mT
|
17.12 kg / 37.74 pounds
17120.0 g / 167.9 N
|
dangerous! |
| 1 mm |
1997 Gs
199.7 mT
|
16.11 kg / 35.52 pounds
16110.1 g / 158.0 N
|
dangerous! |
| 2 mm |
1923 Gs
192.3 mT
|
14.93 kg / 32.91 pounds
14925.7 g / 146.4 N
|
dangerous! |
| 3 mm |
1838 Gs
183.8 mT
|
13.64 kg / 30.06 pounds
13636.4 g / 133.8 N
|
dangerous! |
| 5 mm |
1648 Gs
164.8 mT
|
10.97 kg / 24.18 pounds
10968.0 g / 107.6 N
|
dangerous! |
| 10 mm |
1161 Gs
116.1 mT
|
5.44 kg / 12.00 pounds
5444.8 g / 53.4 N
|
warning |
| 15 mm |
775 Gs
77.5 mT
|
2.43 kg / 5.35 pounds
2427.5 g / 23.8 N
|
warning |
| 20 mm |
515 Gs
51.5 mT
|
1.07 kg / 2.36 pounds
1071.1 g / 10.5 N
|
weak grip |
| 30 mm |
242 Gs
24.2 mT
|
0.24 kg / 0.52 pounds
236.8 g / 2.3 N
|
weak grip |
| 50 mm |
73 Gs
7.3 mT
|
0.02 kg / 0.05 pounds
21.8 g / 0.2 N
|
weak grip |
Table 2: Vertical force (vertical surface)
MP 36.2x11/6x7.5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
3.42 kg / 7.55 pounds
3424.0 g / 33.6 N
|
| 1 mm | Stal (~0.2) |
3.22 kg / 7.10 pounds
3222.0 g / 31.6 N
|
| 2 mm | Stal (~0.2) |
2.99 kg / 6.58 pounds
2986.0 g / 29.3 N
|
| 3 mm | Stal (~0.2) |
2.73 kg / 6.01 pounds
2728.0 g / 26.8 N
|
| 5 mm | Stal (~0.2) |
2.19 kg / 4.84 pounds
2194.0 g / 21.5 N
|
| 10 mm | Stal (~0.2) |
1.09 kg / 2.40 pounds
1088.0 g / 10.7 N
|
| 15 mm | Stal (~0.2) |
0.49 kg / 1.07 pounds
486.0 g / 4.8 N
|
| 20 mm | Stal (~0.2) |
0.21 kg / 0.47 pounds
214.0 g / 2.1 N
|
| 30 mm | Stal (~0.2) |
0.05 kg / 0.11 pounds
48.0 g / 0.5 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - vertical pull
MP 36.2x11/6x7.5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
5.14 kg / 11.32 pounds
5136.0 g / 50.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
3.42 kg / 7.55 pounds
3424.0 g / 33.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.71 kg / 3.77 pounds
1712.0 g / 16.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
8.56 kg / 18.87 pounds
8560.0 g / 84.0 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 36.2x11/6x7.5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.86 kg / 1.89 pounds
856.0 g / 8.4 N
|
| 1 mm |
|
2.14 kg / 4.72 pounds
2140.0 g / 21.0 N
|
| 2 mm |
|
4.28 kg / 9.44 pounds
4280.0 g / 42.0 N
|
| 3 mm |
|
6.42 kg / 14.15 pounds
6420.0 g / 63.0 N
|
| 5 mm |
|
10.70 kg / 23.59 pounds
10700.0 g / 105.0 N
|
| 10 mm |
|
17.12 kg / 37.74 pounds
17120.0 g / 167.9 N
|
| 11 mm |
|
17.12 kg / 37.74 pounds
17120.0 g / 167.9 N
|
| 12 mm |
|
17.12 kg / 37.74 pounds
17120.0 g / 167.9 N
|
Table 5: Thermal resistance (stability) - thermal limit
MP 36.2x11/6x7.5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
17.12 kg / 37.74 pounds
17120.0 g / 167.9 N
|
OK |
| 40 °C | -2.2% |
16.74 kg / 36.91 pounds
16743.4 g / 164.3 N
|
OK |
| 60 °C | -4.4% |
16.37 kg / 36.08 pounds
16366.7 g / 160.6 N
|
|
| 80 °C | -6.6% |
15.99 kg / 35.25 pounds
15990.1 g / 156.9 N
|
|
| 100 °C | -28.8% |
12.19 kg / 26.87 pounds
12189.4 g / 119.6 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 36.2x11/6x7.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
22.24 kg / 49.03 pounds
3 569 Gs
|
3.34 kg / 7.35 pounds
3336 g / 32.7 N
|
N/A |
| 1 mm |
21.62 kg / 47.67 pounds
4 061 Gs
|
3.24 kg / 7.15 pounds
3243 g / 31.8 N
|
19.46 kg / 42.90 pounds
~0 Gs
|
| 2 mm |
20.93 kg / 46.14 pounds
3 995 Gs
|
3.14 kg / 6.92 pounds
3139 g / 30.8 N
|
18.84 kg / 41.52 pounds
~0 Gs
|
| 3 mm |
20.18 kg / 44.49 pounds
3 923 Gs
|
3.03 kg / 6.67 pounds
3027 g / 29.7 N
|
18.16 kg / 40.04 pounds
~0 Gs
|
| 5 mm |
18.56 kg / 40.93 pounds
3 763 Gs
|
2.78 kg / 6.14 pounds
2785 g / 27.3 N
|
16.71 kg / 36.83 pounds
~0 Gs
|
| 10 mm |
14.25 kg / 31.41 pounds
3 296 Gs
|
2.14 kg / 4.71 pounds
2137 g / 21.0 N
|
12.82 kg / 28.27 pounds
~0 Gs
|
| 20 mm |
7.07 kg / 15.59 pounds
2 322 Gs
|
1.06 kg / 2.34 pounds
1061 g / 10.4 N
|
6.37 kg / 14.03 pounds
~0 Gs
|
| 50 mm |
0.64 kg / 1.40 pounds
697 Gs
|
0.10 kg / 0.21 pounds
96 g / 0.9 N
|
0.57 kg / 1.26 pounds
~0 Gs
|
| 60 mm |
0.31 kg / 0.68 pounds
484 Gs
|
0.05 kg / 0.10 pounds
46 g / 0.5 N
|
0.28 kg / 0.61 pounds
~0 Gs
|
| 70 mm |
0.16 kg / 0.35 pounds
346 Gs
|
0.02 kg / 0.05 pounds
24 g / 0.2 N
|
0.14 kg / 0.31 pounds
~0 Gs
|
| 80 mm |
0.08 kg / 0.19 pounds
254 Gs
|
0.01 kg / 0.03 pounds
13 g / 0.1 N
|
0.08 kg / 0.17 pounds
~0 Gs
|
| 90 mm |
0.05 kg / 0.11 pounds
191 Gs
|
0.01 kg / 0.02 pounds
7 g / 0.1 N
|
0.04 kg / 0.10 pounds
~0 Gs
|
| 100 mm |
0.03 kg / 0.06 pounds
147 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.03 kg / 0.06 pounds
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
MP 36.2x11/6x7.5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 13.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 10.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 8.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 6.5 cm |
| Remote | 50 Gs (5.0 mT) | 6.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.0 cm |
Table 8: Impact energy (kinetic energy) - warning
MP 36.2x11/6x7.5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
20.79 km/h
(5.78 m/s)
|
0.94 J | |
| 30 mm |
30.72 km/h
(8.53 m/s)
|
2.05 J | |
| 50 mm |
39.36 km/h
(10.93 m/s)
|
3.36 J | |
| 100 mm |
55.61 km/h
(15.45 m/s)
|
6.72 J |
Table 9: Corrosion resistance
MP 36.2x11/6x7.5 / 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 (Flux)
MP 36.2x11/6x7.5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 21 038 Mx | 210.4 µWb |
| Pc Coefficient | 0.26 | Low (Flat) |
Table 11: Physics of underwater searching
MP 36.2x11/6x7.5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 17.12 kg | Standard |
| Water (riverbed) |
19.60 kg
(+2.48 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical surface, the magnet holds only a fraction of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely limits the holding force.
3. Temperature resistance
*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) = 0.26
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other deals
Advantages and disadvantages of Nd2Fe14B magnets.
Pros
- Their strength is durable, and after around 10 years it drops only by ~1% (according to research),
- They do not lose their magnetic properties even under external field action,
- In other words, due to the aesthetic surface of nickel, the element becomes visually attractive,
- Magnets are distinguished by exceptionally strong magnetic induction on the outer side,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Possibility of exact machining and optimizing to specific conditions,
- Significant place in electronics industry – they are commonly used in HDD drives, electromotive mechanisms, medical devices, also multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in miniature devices
Limitations
- To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
- Limited ability of making nuts in the magnet and complex forms - preferred is a housing - magnet mounting.
- Health risk related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical when they are in the body.
- With large orders the cost of neodymium magnets is economically unviable,
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what contributes to it?
- using a plate made of low-carbon steel, functioning as a circuit closing element
- with a thickness minimum 10 mm
- characterized by smoothness
- without the slightest insulating layer between the magnet and steel
- for force applied at a right angle (in the magnet axis)
- at room temperature
Determinants of practical lifting force of a magnet
- Clearance – existence of foreign body (rust, tape, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Material composition – not every steel attracts identically. Alloy additives worsen the interaction with the magnet.
- Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).
Lifting capacity was measured by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate decreases the holding force.
H&S for magnets
Do not underestimate power
Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.
GPS Danger
Navigation devices and mobile phones are highly susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the internal compass in your phone.
Fragile material
Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.
Data carriers
Device Safety: Strong magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, timepieces).
This is not a toy
Neodymium magnets are not suitable for play. Accidental ingestion of multiple magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates urgent medical intervention.
Dust is flammable
Mechanical processing of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Avoid contact if allergic
Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness appears, immediately stop working with magnets and use protective gear.
Heat sensitivity
Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. Damage is permanent.
Pacemakers
Medical warning: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.
Bone fractures
Large magnets can break fingers in a fraction of a second. Never put your hand betwixt two strong magnets.
