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
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Technical details - 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 |
Physical analysis of the product - technical parameters
Presented data are the direct effect of a engineering analysis. Results were calculated on models for the material Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Use these calculations as a reference point during assembly planning.
Table 1: Static pull force (force vs distance) - power drop
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 lbs
17120.0 g / 167.9 N
|
critical level |
| 1 mm |
1997 Gs
199.7 mT
|
16.11 kg / 35.52 lbs
16110.1 g / 158.0 N
|
critical level |
| 2 mm |
1923 Gs
192.3 mT
|
14.93 kg / 32.91 lbs
14925.7 g / 146.4 N
|
critical level |
| 3 mm |
1838 Gs
183.8 mT
|
13.64 kg / 30.06 lbs
13636.4 g / 133.8 N
|
critical level |
| 5 mm |
1648 Gs
164.8 mT
|
10.97 kg / 24.18 lbs
10968.0 g / 107.6 N
|
critical level |
| 10 mm |
1161 Gs
116.1 mT
|
5.44 kg / 12.00 lbs
5444.8 g / 53.4 N
|
strong |
| 15 mm |
775 Gs
77.5 mT
|
2.43 kg / 5.35 lbs
2427.5 g / 23.8 N
|
strong |
| 20 mm |
515 Gs
51.5 mT
|
1.07 kg / 2.36 lbs
1071.1 g / 10.5 N
|
safe |
| 30 mm |
242 Gs
24.2 mT
|
0.24 kg / 0.52 lbs
236.8 g / 2.3 N
|
safe |
| 50 mm |
73 Gs
7.3 mT
|
0.02 kg / 0.05 lbs
21.8 g / 0.2 N
|
safe |
Table 2: Shear capacity (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 lbs
3424.0 g / 33.6 N
|
| 1 mm | Stal (~0.2) |
3.22 kg / 7.10 lbs
3222.0 g / 31.6 N
|
| 2 mm | Stal (~0.2) |
2.99 kg / 6.58 lbs
2986.0 g / 29.3 N
|
| 3 mm | Stal (~0.2) |
2.73 kg / 6.01 lbs
2728.0 g / 26.8 N
|
| 5 mm | Stal (~0.2) |
2.19 kg / 4.84 lbs
2194.0 g / 21.5 N
|
| 10 mm | Stal (~0.2) |
1.09 kg / 2.40 lbs
1088.0 g / 10.7 N
|
| 15 mm | Stal (~0.2) |
0.49 kg / 1.07 lbs
486.0 g / 4.8 N
|
| 20 mm | Stal (~0.2) |
0.21 kg / 0.47 lbs
214.0 g / 2.1 N
|
| 30 mm | Stal (~0.2) |
0.05 kg / 0.11 lbs
48.0 g / 0.5 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - 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 lbs
5136.0 g / 50.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
3.42 kg / 7.55 lbs
3424.0 g / 33.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.71 kg / 3.77 lbs
1712.0 g / 16.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
8.56 kg / 18.87 lbs
8560.0 g / 84.0 N
|
Table 4: Steel thickness (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 lbs
856.0 g / 8.4 N
|
| 1 mm |
|
2.14 kg / 4.72 lbs
2140.0 g / 21.0 N
|
| 2 mm |
|
4.28 kg / 9.44 lbs
4280.0 g / 42.0 N
|
| 3 mm |
|
6.42 kg / 14.15 lbs
6420.0 g / 63.0 N
|
| 5 mm |
|
10.70 kg / 23.59 lbs
10700.0 g / 105.0 N
|
| 10 mm |
|
17.12 kg / 37.74 lbs
17120.0 g / 167.9 N
|
| 11 mm |
|
17.12 kg / 37.74 lbs
17120.0 g / 167.9 N
|
| 12 mm |
|
17.12 kg / 37.74 lbs
17120.0 g / 167.9 N
|
Table 5: Working in heat (material behavior) - resistance threshold
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 lbs
17120.0 g / 167.9 N
|
OK |
| 40 °C | -2.2% |
16.74 kg / 36.91 lbs
16743.4 g / 164.3 N
|
OK |
| 60 °C | -4.4% |
16.37 kg / 36.08 lbs
16366.7 g / 160.6 N
|
|
| 80 °C | -6.6% |
15.99 kg / 35.25 lbs
15990.1 g / 156.9 N
|
|
| 100 °C | -28.8% |
12.19 kg / 26.87 lbs
12189.4 g / 119.6 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MP 36.2x11/6x7.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
22.24 kg / 49.03 lbs
3 569 Gs
|
3.34 kg / 7.35 lbs
3336 g / 32.7 N
|
N/A |
| 1 mm |
21.62 kg / 47.67 lbs
4 061 Gs
|
3.24 kg / 7.15 lbs
3243 g / 31.8 N
|
19.46 kg / 42.90 lbs
~0 Gs
|
| 2 mm |
20.93 kg / 46.14 lbs
3 995 Gs
|
3.14 kg / 6.92 lbs
3139 g / 30.8 N
|
18.84 kg / 41.52 lbs
~0 Gs
|
| 3 mm |
20.18 kg / 44.49 lbs
3 923 Gs
|
3.03 kg / 6.67 lbs
3027 g / 29.7 N
|
18.16 kg / 40.04 lbs
~0 Gs
|
| 5 mm |
18.56 kg / 40.93 lbs
3 763 Gs
|
2.78 kg / 6.14 lbs
2785 g / 27.3 N
|
16.71 kg / 36.83 lbs
~0 Gs
|
| 10 mm |
14.25 kg / 31.41 lbs
3 296 Gs
|
2.14 kg / 4.71 lbs
2137 g / 21.0 N
|
12.82 kg / 28.27 lbs
~0 Gs
|
| 20 mm |
7.07 kg / 15.59 lbs
2 322 Gs
|
1.06 kg / 2.34 lbs
1061 g / 10.4 N
|
6.37 kg / 14.03 lbs
~0 Gs
|
| 50 mm |
0.64 kg / 1.40 lbs
697 Gs
|
0.10 kg / 0.21 lbs
96 g / 0.9 N
|
0.57 kg / 1.26 lbs
~0 Gs
|
| 60 mm |
0.31 kg / 0.68 lbs
484 Gs
|
0.05 kg / 0.10 lbs
46 g / 0.5 N
|
0.28 kg / 0.61 lbs
~0 Gs
|
| 70 mm |
0.16 kg / 0.35 lbs
346 Gs
|
0.02 kg / 0.05 lbs
24 g / 0.2 N
|
0.14 kg / 0.31 lbs
~0 Gs
|
| 80 mm |
0.08 kg / 0.19 lbs
254 Gs
|
0.01 kg / 0.03 lbs
13 g / 0.1 N
|
0.08 kg / 0.17 lbs
~0 Gs
|
| 90 mm |
0.05 kg / 0.11 lbs
191 Gs
|
0.01 kg / 0.02 lbs
7 g / 0.1 N
|
0.04 kg / 0.10 lbs
~0 Gs
|
| 100 mm |
0.03 kg / 0.06 lbs
147 Gs
|
0.00 kg / 0.01 lbs
4 g / 0.0 N
|
0.03 kg / 0.06 lbs
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
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 |
| Timepiece | 20 Gs (2.0 mT) | 8.5 cm |
| Phone / Smartphone | 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 (cracking risk) - 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: Anti-corrosion coating durability
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 (Pc)
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. Wall mount (shear)
*Note: On a vertical wall, the magnet holds merely ~20% of its perpendicular strength.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) significantly reduces the holding force.
3. Heat tolerance
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26
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.
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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Strengths and weaknesses of Nd2Fe14B magnets.
Pros
- Their strength remains stable, and after around ten years it decreases only by ~1% (theoretically),
- They feature excellent resistance to magnetic field loss due to external fields,
- Thanks to the glossy finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an clean appearance,
- Neodymium magnets ensure maximum magnetic induction on a small area, which ensures high operational effectiveness,
- 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...
- Considering the option of flexible forming and customization to custom needs, NdFeB magnets can be manufactured in a broad palette of geometric configurations, which increases their versatility,
- Wide application in high-tech industry – they are commonly used in computer drives, electric motors, medical equipment, also complex engineering applications.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Limitations
- To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
- When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
- Due to limitations in realizing nuts and complicated forms in magnets, we propose using casing - 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. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics 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
Pull force analysis
Detachment force of the magnet in optimal conditions – what contributes to it?
- on a block made of mild steel, perfectly concentrating the magnetic field
- possessing a thickness of min. 10 mm to avoid saturation
- with a surface perfectly flat
- without any air gap between the magnet and steel
- under perpendicular application of breakaway force (90-degree angle)
- at standard ambient temperature
Key elements affecting lifting force
- Distance – existence of foreign body (paint, tape, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
- Angle of force application – highest force is available only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
- Steel thickness – too thin sheet does not accept the full field, causing part of the flux to be escaped into the air.
- Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
- Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
- Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).
Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet’s surface and the plate reduces the holding force.
Warnings
Phone sensors
A strong magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Do not bring magnets close to a smartphone to avoid breaking the sensors.
Threat to electronics
Equipment safety: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, timepieces).
Do not give to children
Always store magnets away from children. Choking hazard is high, and the effects of magnets connecting inside the body are tragic.
Danger to pacemakers
Individuals with a pacemaker have to keep an safe separation from magnets. The magnetic field can stop the functioning of the implant.
Fire risk
Fire hazard: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.
Maximum temperature
Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. The loss of strength is permanent.
Physical harm
Danger of trauma: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.
Safe operation
Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.
Sensitization to coating
Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation happens, immediately stop handling magnets and wear gloves.
Fragile material
NdFeB magnets are ceramic materials, meaning they are very brittle. Impact of two magnets leads to them shattering into small pieces.
