MP 41x15x10 / N38 - ring magnet
ring magnet
Catalog no 030200
GTIN/EAN: 5906301812173
Diameter
41 mm [±0,1 mm]
internal diameter Ø
15 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
85.77 g
Magnetization Direction
↑ axial
Load capacity
24.44 kg / 239.78 N
Magnetic Induction
271.77 mT / 2718 Gs
Coating
[NiCuNi] Nickel
50.00 ZŁ with VAT / pcs + price for transport
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Physical properties - MP 41x15x10 / N38 - ring magnet
Specification / characteristics - MP 41x15x10 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030200 |
| GTIN/EAN | 5906301812173 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 41 mm [±0,1 mm] |
| internal diameter Ø | 15 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 85.77 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 24.44 kg / 239.78 N |
| Magnetic Induction ~ ? | 271.77 mT / 2718 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
The following information represent the direct effect of a physical calculation. Values were calculated on models for the class Nd2Fe14B. Actual parameters may differ. Please consider these data as a reference point when designing systems.
Table 1: Static force (pull vs distance) - interaction chart
MP 41x15x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5232 Gs
523.2 mT
|
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
|
dangerous! |
| 1 mm |
4978 Gs
497.8 mT
|
22.12 kg / 48.77 LBS
22120.4 g / 217.0 N
|
dangerous! |
| 2 mm |
4720 Gs
472.0 mT
|
19.89 kg / 43.85 LBS
19888.8 g / 195.1 N
|
dangerous! |
| 3 mm |
4464 Gs
446.4 mT
|
17.79 kg / 39.22 LBS
17788.4 g / 174.5 N
|
dangerous! |
| 5 mm |
3964 Gs
396.4 mT
|
14.03 kg / 30.93 LBS
14030.8 g / 137.6 N
|
dangerous! |
| 10 mm |
2861 Gs
286.1 mT
|
7.31 kg / 16.11 LBS
7308.1 g / 71.7 N
|
warning |
| 15 mm |
2028 Gs
202.8 mT
|
3.67 kg / 8.09 LBS
3670.1 g / 36.0 N
|
warning |
| 20 mm |
1443 Gs
144.3 mT
|
1.86 kg / 4.10 LBS
1858.4 g / 18.2 N
|
weak grip |
| 30 mm |
770 Gs
77.0 mT
|
0.53 kg / 1.17 LBS
529.8 g / 5.2 N
|
weak grip |
| 50 mm |
280 Gs
28.0 mT
|
0.07 kg / 0.15 LBS
69.8 g / 0.7 N
|
weak grip |
Table 2: Shear load (wall)
MP 41x15x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.89 kg / 10.78 LBS
4888.0 g / 48.0 N
|
| 1 mm | Stal (~0.2) |
4.42 kg / 9.75 LBS
4424.0 g / 43.4 N
|
| 2 mm | Stal (~0.2) |
3.98 kg / 8.77 LBS
3978.0 g / 39.0 N
|
| 3 mm | Stal (~0.2) |
3.56 kg / 7.84 LBS
3558.0 g / 34.9 N
|
| 5 mm | Stal (~0.2) |
2.81 kg / 6.19 LBS
2806.0 g / 27.5 N
|
| 10 mm | Stal (~0.2) |
1.46 kg / 3.22 LBS
1462.0 g / 14.3 N
|
| 15 mm | Stal (~0.2) |
0.73 kg / 1.62 LBS
734.0 g / 7.2 N
|
| 20 mm | Stal (~0.2) |
0.37 kg / 0.82 LBS
372.0 g / 3.6 N
|
| 30 mm | Stal (~0.2) |
0.11 kg / 0.23 LBS
106.0 g / 1.0 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.03 LBS
14.0 g / 0.1 N
|
Table 3: Vertical assembly (shearing) - vertical pull
MP 41x15x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
7.33 kg / 16.16 LBS
7332.0 g / 71.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.89 kg / 10.78 LBS
4888.0 g / 48.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.44 kg / 5.39 LBS
2444.0 g / 24.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
12.22 kg / 26.94 LBS
12220.0 g / 119.9 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 41x15x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.22 kg / 2.69 LBS
1222.0 g / 12.0 N
|
| 1 mm |
|
3.06 kg / 6.74 LBS
3055.0 g / 30.0 N
|
| 2 mm |
|
6.11 kg / 13.47 LBS
6110.0 g / 59.9 N
|
| 3 mm |
|
9.17 kg / 20.21 LBS
9165.0 g / 89.9 N
|
| 5 mm |
|
15.28 kg / 33.68 LBS
15275.0 g / 149.8 N
|
| 10 mm |
|
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
|
| 11 mm |
|
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
|
| 12 mm |
|
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
|
Table 5: Thermal resistance (material behavior) - resistance threshold
MP 41x15x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
|
OK |
| 40 °C | -2.2% |
23.90 kg / 52.70 LBS
23902.3 g / 234.5 N
|
OK |
| 60 °C | -4.4% |
23.36 kg / 51.51 LBS
23364.6 g / 229.2 N
|
OK |
| 80 °C | -6.6% |
22.83 kg / 50.32 LBS
22827.0 g / 223.9 N
|
|
| 100 °C | -28.8% |
17.40 kg / 38.36 LBS
17401.3 g / 170.7 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MP 41x15x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
178.13 kg / 392.71 LBS
5 907 Gs
|
26.72 kg / 58.91 LBS
26719 g / 262.1 N
|
N/A |
| 1 mm |
169.67 kg / 374.06 LBS
10 213 Gs
|
25.45 kg / 56.11 LBS
25451 g / 249.7 N
|
152.70 kg / 336.65 LBS
~0 Gs
|
| 2 mm |
161.22 kg / 355.43 LBS
9 955 Gs
|
24.18 kg / 53.32 LBS
24183 g / 237.2 N
|
145.10 kg / 319.89 LBS
~0 Gs
|
| 3 mm |
152.98 kg / 337.26 LBS
9 697 Gs
|
22.95 kg / 50.59 LBS
22947 g / 225.1 N
|
137.68 kg / 303.53 LBS
~0 Gs
|
| 5 mm |
137.18 kg / 302.42 LBS
9 183 Gs
|
20.58 kg / 45.36 LBS
20577 g / 201.9 N
|
123.46 kg / 272.18 LBS
~0 Gs
|
| 10 mm |
102.26 kg / 225.45 LBS
7 929 Gs
|
15.34 kg / 33.82 LBS
15339 g / 150.5 N
|
92.04 kg / 202.90 LBS
~0 Gs
|
| 20 mm |
53.26 kg / 117.43 LBS
5 722 Gs
|
7.99 kg / 17.61 LBS
7990 g / 78.4 N
|
47.94 kg / 105.69 LBS
~0 Gs
|
| 50 mm |
7.08 kg / 15.62 LBS
2 087 Gs
|
1.06 kg / 2.34 LBS
1063 g / 10.4 N
|
6.38 kg / 14.06 LBS
~0 Gs
|
| 60 mm |
3.86 kg / 8.51 LBS
1 541 Gs
|
0.58 kg / 1.28 LBS
579 g / 5.7 N
|
3.48 kg / 7.66 LBS
~0 Gs
|
| 70 mm |
2.20 kg / 4.84 LBS
1 162 Gs
|
0.33 kg / 0.73 LBS
330 g / 3.2 N
|
1.98 kg / 4.36 LBS
~0 Gs
|
| 80 mm |
1.30 kg / 2.87 LBS
895 Gs
|
0.20 kg / 0.43 LBS
195 g / 1.9 N
|
1.17 kg / 2.58 LBS
~0 Gs
|
| 90 mm |
0.80 kg / 1.76 LBS
701 Gs
|
0.12 kg / 0.26 LBS
120 g / 1.2 N
|
0.72 kg / 1.59 LBS
~0 Gs
|
| 100 mm |
0.51 kg / 1.12 LBS
559 Gs
|
0.08 kg / 0.17 LBS
76 g / 0.7 N
|
0.46 kg / 1.01 LBS
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
MP 41x15x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 24.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 19.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 15.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 11.5 cm |
| Car key | 50 Gs (5.0 mT) | 10.5 cm |
| Payment card | 400 Gs (40.0 mT) | 4.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.5 cm |
Table 8: Collisions (kinetic energy) - warning
MP 41x15x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
19.95 km/h
(5.54 m/s)
|
1.32 J | |
| 30 mm |
29.88 km/h
(8.30 m/s)
|
2.96 J | |
| 50 mm |
38.13 km/h
(10.59 m/s)
|
4.81 J | |
| 100 mm |
53.84 km/h
(14.96 m/s)
|
9.59 J |
Table 9: Surface protection spec
MP 41x15x10 / 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 41x15x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 56 505 Mx | 565.0 µWb |
| Pc Coefficient | 0.80 | High (Stable) |
Table 11: Physics of underwater searching
MP 41x15x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 24.44 kg | Standard |
| Water (riverbed) |
27.98 kg
(+3.54 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical surface, the magnet retains only a fraction of its max power.
2. Plate thickness effect
*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.
3. Temperature resistance
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.80
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 |
Other deals
Strengths and weaknesses of neodymium magnets.
Advantages
- They do not lose strength, even over approximately ten years – the drop in strength is only ~1% (according to tests),
- Magnets perfectly defend themselves against loss of magnetization caused by ambient magnetic noise,
- By covering with a smooth layer of gold, the element presents an modern look,
- They feature high magnetic induction at the operating surface, which improves attraction properties,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
- In view of the possibility of accurate shaping and customization to custom solutions, NdFeB magnets can be created in a variety of forms and dimensions, which amplifies use scope,
- Fundamental importance in modern industrial fields – they serve a role in data components, electromotive mechanisms, medical devices, also complex engineering applications.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Weaknesses
- They are prone to damage 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
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in realizing threads and complicated shapes in magnets, we recommend using a housing - magnetic mechanism.
- Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets are able to complicate diagnosis medical in case of swallowing.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Lifting parameters
Maximum holding power of the magnet – what contributes to it?
- with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
- whose transverse dimension equals approx. 10 mm
- with an ideally smooth contact surface
- with zero gap (no paint)
- for force acting at a right angle (pull-off, not shear)
- in temp. approx. 20°C
Magnet lifting force in use – key factors
- Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Angle of force application – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Steel grade – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
- Plate texture – ground elements ensure maximum contact, which increases force. Uneven metal weaken the grip.
- Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.
Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet and the plate reduces the lifting capacity.
Safe handling of neodymium magnets
Material brittleness
Beware of splinters. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.
Do not drill into magnets
Drilling and cutting of neodymium magnets poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Hand protection
Pinching hazard: The attraction force is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.
Data carriers
Avoid bringing magnets near a purse, computer, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.
Do not underestimate power
Handle magnets with awareness. Their immense force can shock even experienced users. Be vigilant and do not underestimate their force.
Magnetic interference
A strong magnetic field negatively affects the operation of compasses in phones and GPS navigation. Do not bring magnets near a device to prevent damaging the sensors.
Operating temperature
Control the heat. Heating the magnet above 80 degrees Celsius will destroy its properties and pulling force.
Sensitization to coating
Studies show that the nickel plating (the usual finish) is a common allergen. For allergy sufferers, refrain from direct skin contact or opt for coated magnets.
Adults only
Neodymium magnets are not toys. Accidental ingestion of several magnets may result in them pinching intestinal walls, which constitutes a critical condition and necessitates urgent medical intervention.
Medical implants
Warning for patients: Strong magnetic fields affect medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.
