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 parameters 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 |
Technical analysis of the product - technical parameters
Presented values are the outcome of a engineering analysis. Results were calculated on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ. Use these data as a preliminary roadmap for designers.
Table 1: Static pull force (pull vs distance) - characteristics
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
|
critical level |
| 1 mm |
1997 Gs
199.7 mT
|
16.11 kg / 35.52 pounds
16110.1 g / 158.0 N
|
critical level |
| 2 mm |
1923 Gs
192.3 mT
|
14.93 kg / 32.91 pounds
14925.7 g / 146.4 N
|
critical level |
| 3 mm |
1838 Gs
183.8 mT
|
13.64 kg / 30.06 pounds
13636.4 g / 133.8 N
|
critical level |
| 5 mm |
1648 Gs
164.8 mT
|
10.97 kg / 24.18 pounds
10968.0 g / 107.6 N
|
critical level |
| 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
|
safe |
| 30 mm |
242 Gs
24.2 mT
|
0.24 kg / 0.52 pounds
236.8 g / 2.3 N
|
safe |
| 50 mm |
73 Gs
7.3 mT
|
0.02 kg / 0.05 pounds
21.8 g / 0.2 N
|
safe |
Table 2: Vertical capacity (wall)
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: Vertical assembly (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: Steel thickness (saturation) - 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: Working in heat (material behavior) - 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 (attraction) - field collision
MP 36.2x11/6x7.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear 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: 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 |
| Mobile device | 40 Gs (4.0 mT) | 6.5 cm |
| Car key | 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: Dynamics (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: Electrical 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: Submerged application
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
*Note: On a vertical wall, the magnet retains just a fraction of its nominal pull.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Thermal stability
*For standard magnets, 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.
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 deals
Pros and cons of neodymium magnets.
Advantages
- Their strength remains stable, and after approximately 10 years it decreases only by ~1% (according to research),
- Neodymium magnets remain remarkably resistant to demagnetization caused by external magnetic fields,
- Thanks to the shiny finish, the surface of Ni-Cu-Ni, gold-plated, or silver-plated gives an elegant appearance,
- Magnetic induction on the surface of the magnet is maximum,
- Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to flexibility in forming and the ability to customize to individual projects,
- Significant place in innovative solutions – they are utilized in magnetic memories, drive modules, advanced medical instruments, as well as industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in small systems
Weaknesses
- They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
- Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- We recommend casing - magnetic mount, due to difficulties in creating threads inside the magnet and complicated shapes.
- Potential hazard related to microscopic parts of magnets are risky, if swallowed, which gains importance in the context of child safety. Additionally, small components of these products are able to disrupt the diagnostic process medical when they are in the body.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities
Pull force analysis
Maximum lifting force for a neodymium magnet – what it depends on?
- using a sheet made of high-permeability steel, functioning as a circuit closing element
- whose transverse dimension equals approx. 10 mm
- with an polished contact surface
- with zero gap (without coatings)
- for force applied at a right angle (in the magnet axis)
- in stable room temperature
Lifting capacity in practice – influencing factors
- Distance (between the magnet and the metal), as even a very small distance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
- Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Steel grade – the best choice is pure iron steel. Cast iron may attract less.
- Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
- Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.
Lifting capacity was determined using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.
Safe handling of neodymium magnets
Keep away from electronics
Navigation devices and smartphones are highly sensitive to magnetic fields. Direct contact with a strong magnet can ruin the internal compass in your phone.
Cards and drives
Avoid bringing magnets near a wallet, computer, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.
Dust is flammable
Mechanical processing of neodymium magnets carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Bone fractures
Risk of injury: The pulling power is so great that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.
Risk of cracking
Beware of splinters. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. We recommend safety glasses.
Respect the power
Before use, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.
Allergy Warning
Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If skin irritation happens, cease handling magnets and wear gloves.
Permanent damage
Standard neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.
Adults only
Always keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are very dangerous.
Implant safety
Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.
