MP 32x16x3 / N38 - ring magnet
ring magnet
Catalog no 030198
GTIN/EAN: 5906301812159
Diameter
32 mm [±0,1 mm]
internal diameter Ø
16 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
13.57 g
Magnetization Direction
↑ axial
Load capacity
2.79 kg / 27.40 N
Magnetic Induction
114.25 mT / 1142 Gs
Coating
[NiCuNi] Nickel
5.24 ZŁ with VAT / pcs + price for transport
4.26 ZŁ net + 23% VAT / pcs
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Product card - MP 32x16x3 / N38 - ring magnet
Specification / characteristics - MP 32x16x3 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030198 |
| GTIN/EAN | 5906301812159 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 32 mm [±0,1 mm] |
| internal diameter Ø | 16 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 13.57 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.79 kg / 27.40 N |
| Magnetic Induction ~ ? | 114.25 mT / 1142 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 magnet - data
The following data are the direct effect of a mathematical analysis. Values were calculated on algorithms for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Treat these calculations as a preliminary roadmap for designers.
Table 1: Static force (pull vs gap) - characteristics
MP 32x16x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5552 Gs
555.2 mT
|
2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
|
medium risk |
| 1 mm |
5202 Gs
520.2 mT
|
2.45 kg / 5.40 pounds
2448.8 g / 24.0 N
|
medium risk |
| 2 mm |
4850 Gs
485.0 mT
|
2.13 kg / 4.69 pounds
2128.7 g / 20.9 N
|
medium risk |
| 3 mm |
4504 Gs
450.4 mT
|
1.84 kg / 4.05 pounds
1836.3 g / 18.0 N
|
low risk |
| 5 mm |
3849 Gs
384.9 mT
|
1.34 kg / 2.96 pounds
1340.5 g / 13.2 N
|
low risk |
| 10 mm |
2513 Gs
251.3 mT
|
0.57 kg / 1.26 pounds
571.6 g / 5.6 N
|
low risk |
| 15 mm |
1633 Gs
163.3 mT
|
0.24 kg / 0.53 pounds
241.2 g / 2.4 N
|
low risk |
| 20 mm |
1087 Gs
108.7 mT
|
0.11 kg / 0.24 pounds
107.0 g / 1.0 N
|
low risk |
| 30 mm |
535 Gs
53.5 mT
|
0.03 kg / 0.06 pounds
25.9 g / 0.3 N
|
low risk |
| 50 mm |
181 Gs
18.1 mT
|
0.00 kg / 0.01 pounds
3.0 g / 0.0 N
|
low risk |
Table 2: Shear capacity (wall)
MP 32x16x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.56 kg / 1.23 pounds
558.0 g / 5.5 N
|
| 1 mm | Stal (~0.2) |
0.49 kg / 1.08 pounds
490.0 g / 4.8 N
|
| 2 mm | Stal (~0.2) |
0.43 kg / 0.94 pounds
426.0 g / 4.2 N
|
| 3 mm | Stal (~0.2) |
0.37 kg / 0.81 pounds
368.0 g / 3.6 N
|
| 5 mm | Stal (~0.2) |
0.27 kg / 0.59 pounds
268.0 g / 2.6 N
|
| 10 mm | Stal (~0.2) |
0.11 kg / 0.25 pounds
114.0 g / 1.1 N
|
| 15 mm | Stal (~0.2) |
0.05 kg / 0.11 pounds
48.0 g / 0.5 N
|
| 20 mm | Stal (~0.2) |
0.02 kg / 0.05 pounds
22.0 g / 0.2 N
|
| 30 mm | Stal (~0.2) |
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 32x16x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.84 kg / 1.85 pounds
837.0 g / 8.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.56 kg / 1.23 pounds
558.0 g / 5.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.28 kg / 0.62 pounds
279.0 g / 2.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.40 kg / 3.08 pounds
1395.0 g / 13.7 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 32x16x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.28 kg / 0.62 pounds
279.0 g / 2.7 N
|
| 1 mm |
|
0.70 kg / 1.54 pounds
697.5 g / 6.8 N
|
| 2 mm |
|
1.40 kg / 3.08 pounds
1395.0 g / 13.7 N
|
| 3 mm |
|
2.09 kg / 4.61 pounds
2092.5 g / 20.5 N
|
| 5 mm |
|
2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
|
| 10 mm |
|
2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
|
| 11 mm |
|
2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
|
| 12 mm |
|
2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
|
Table 5: Thermal resistance (stability) - power drop
MP 32x16x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
|
OK |
| 40 °C | -2.2% |
2.73 kg / 6.02 pounds
2728.6 g / 26.8 N
|
OK |
| 60 °C | -4.4% |
2.67 kg / 5.88 pounds
2667.2 g / 26.2 N
|
OK |
| 80 °C | -6.6% |
2.61 kg / 5.74 pounds
2605.9 g / 25.6 N
|
|
| 100 °C | -28.8% |
1.99 kg / 4.38 pounds
1986.5 g / 19.5 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 32x16x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
128.78 kg / 283.90 pounds
6 014 Gs
|
19.32 kg / 42.59 pounds
19317 g / 189.5 N
|
N/A |
| 1 mm |
120.86 kg / 266.44 pounds
10 757 Gs
|
18.13 kg / 39.97 pounds
18128 g / 177.8 N
|
108.77 kg / 239.80 pounds
~0 Gs
|
| 2 mm |
113.03 kg / 249.19 pounds
10 403 Gs
|
16.95 kg / 37.38 pounds
16954 g / 166.3 N
|
101.73 kg / 224.27 pounds
~0 Gs
|
| 3 mm |
105.49 kg / 232.56 pounds
10 050 Gs
|
15.82 kg / 34.88 pounds
15823 g / 155.2 N
|
94.94 kg / 209.31 pounds
~0 Gs
|
| 5 mm |
91.34 kg / 201.37 pounds
9 352 Gs
|
13.70 kg / 30.21 pounds
13701 g / 134.4 N
|
82.21 kg / 181.23 pounds
~0 Gs
|
| 10 mm |
61.88 kg / 136.41 pounds
7 697 Gs
|
9.28 kg / 20.46 pounds
9281 g / 91.0 N
|
55.69 kg / 122.77 pounds
~0 Gs
|
| 20 mm |
26.38 kg / 58.16 pounds
5 026 Gs
|
3.96 kg / 8.72 pounds
3957 g / 38.8 N
|
23.74 kg / 52.35 pounds
~0 Gs
|
| 50 mm |
2.35 kg / 5.17 pounds
1 499 Gs
|
0.35 kg / 0.78 pounds
352 g / 3.5 N
|
2.11 kg / 4.66 pounds
~0 Gs
|
| 60 mm |
1.19 kg / 2.63 pounds
1 069 Gs
|
0.18 kg / 0.39 pounds
179 g / 1.8 N
|
1.07 kg / 2.37 pounds
~0 Gs
|
| 70 mm |
0.65 kg / 1.42 pounds
786 Gs
|
0.10 kg / 0.21 pounds
97 g / 1.0 N
|
0.58 kg / 1.28 pounds
~0 Gs
|
| 80 mm |
0.37 kg / 0.81 pounds
594 Gs
|
0.06 kg / 0.12 pounds
55 g / 0.5 N
|
0.33 kg / 0.73 pounds
~0 Gs
|
| 90 mm |
0.22 kg / 0.49 pounds
459 Gs
|
0.03 kg / 0.07 pounds
33 g / 0.3 N
|
0.20 kg / 0.44 pounds
~0 Gs
|
| 100 mm |
0.14 kg / 0.30 pounds
362 Gs
|
0.02 kg / 0.05 pounds
21 g / 0.2 N
|
0.12 kg / 0.27 pounds
~0 Gs
|
Table 7: Hazards (electronics) - warnings
MP 32x16x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 20.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 16.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 12.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 9.5 cm |
| Remote | 50 Gs (5.0 mT) | 9.0 cm |
| Payment card | 400 Gs (40.0 mT) | 3.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.0 cm |
Table 8: Impact energy (cracking risk) - collision effects
MP 32x16x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
16.21 km/h
(4.50 m/s)
|
0.14 J | |
| 30 mm |
25.19 km/h
(7.00 m/s)
|
0.33 J | |
| 50 mm |
32.36 km/h
(8.99 m/s)
|
0.55 J | |
| 100 mm |
45.73 km/h
(12.70 m/s)
|
1.09 J |
Table 9: Corrosion resistance
MP 32x16x3 / 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 (Pc)
MP 32x16x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 38 808 Mx | 388.1 µWb |
| Pc Coefficient | 0.90 | High (Stable) |
Table 11: Submerged application
MP 32x16x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.79 kg | Standard |
| Water (riverbed) |
3.19 kg
(+0.40 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical surface, the magnet holds merely a fraction of its max power.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.
3. Temperature resistance
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.90
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Strengths and weaknesses of Nd2Fe14B magnets.
Benefits
- They have stable power, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
- Magnets very well defend themselves against loss of magnetization caused by external fields,
- A magnet with a shiny silver surface is more attractive,
- Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Due to the option of precise shaping and adaptation to individualized solutions, NdFeB magnets can be produced in a broad palette of geometric configurations, which increases their versatility,
- Wide application in innovative solutions – they are utilized in computer drives, electric drive systems, diagnostic systems, and technologically advanced constructions.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Weaknesses
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
- When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and 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 usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
- Limited ability of making nuts in the magnet and complicated forms - recommended is a housing - magnet mounting.
- Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these products are able to be problematic in diagnostics medical after entering the body.
- Due to expensive raw materials, their price is relatively high,
Pull force analysis
Maximum magnetic pulling force – what affects it?
- with the use of a sheet made of special test steel, ensuring maximum field concentration
- whose thickness reaches at least 10 mm
- characterized by lack of roughness
- under conditions of gap-free contact (surface-to-surface)
- for force applied at a right angle (in the magnet axis)
- at ambient temperature room level
Practical lifting capacity: influencing factors
- Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity 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 limits the lifting capacity (the magnet "punches through" it).
- Chemical composition of the base – mild steel attracts best. Higher carbon content reduce magnetic permeability and holding force.
- Smoothness – full contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
- Temperature – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.
Lifting capacity was determined using a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate reduces the holding force.
H&S for magnets
Medical interference
People with a ICD must keep an absolute distance from magnets. The magnetic field can stop the operation of the implant.
Allergic reactions
Medical facts indicate that nickel (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent touching magnets with bare hands or choose coated magnets.
Material brittleness
NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets will cause them cracking into small pieces.
Do not underestimate power
Handle with care. Rare earth magnets attract from a distance and snap with massive power, often quicker than you can move away.
Operating temperature
Avoid heat. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, look for HT versions (H, SH, UH).
This is not a toy
Always keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are very dangerous.
Precision electronics
Be aware: neodymium magnets produce a field that confuses precision electronics. Maintain a safe distance from your phone, device, and navigation systems.
Electronic devices
Equipment safety: Strong magnets can damage data carriers and sensitive devices (heart implants, medical aids, mechanical watches).
Hand protection
Large magnets can smash fingers in a fraction of a second. Do not put your hand between two strong magnets.
Machining danger
Powder created during cutting of magnets is combustible. Do not drill into magnets unless you are an expert.
