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
bulk discounts:
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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 |
Physical modeling of the product - report
Presented information are the outcome of a engineering calculation. Results were calculated on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ. Treat these calculations as a preliminary roadmap when designing systems.
Table 1: Static pull force (force vs gap) - power drop
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 lbs
2790.0 g / 27.4 N
|
strong |
| 1 mm |
5202 Gs
520.2 mT
|
2.45 kg / 5.40 lbs
2448.8 g / 24.0 N
|
strong |
| 2 mm |
4850 Gs
485.0 mT
|
2.13 kg / 4.69 lbs
2128.7 g / 20.9 N
|
strong |
| 3 mm |
4504 Gs
450.4 mT
|
1.84 kg / 4.05 lbs
1836.3 g / 18.0 N
|
safe |
| 5 mm |
3849 Gs
384.9 mT
|
1.34 kg / 2.96 lbs
1340.5 g / 13.2 N
|
safe |
| 10 mm |
2513 Gs
251.3 mT
|
0.57 kg / 1.26 lbs
571.6 g / 5.6 N
|
safe |
| 15 mm |
1633 Gs
163.3 mT
|
0.24 kg / 0.53 lbs
241.2 g / 2.4 N
|
safe |
| 20 mm |
1087 Gs
108.7 mT
|
0.11 kg / 0.24 lbs
107.0 g / 1.0 N
|
safe |
| 30 mm |
535 Gs
53.5 mT
|
0.03 kg / 0.06 lbs
25.9 g / 0.3 N
|
safe |
| 50 mm |
181 Gs
18.1 mT
|
0.00 kg / 0.01 lbs
3.0 g / 0.0 N
|
safe |
Table 2: Slippage hold (wall)
MP 32x16x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.56 kg / 1.23 lbs
558.0 g / 5.5 N
|
| 1 mm | Stal (~0.2) |
0.49 kg / 1.08 lbs
490.0 g / 4.8 N
|
| 2 mm | Stal (~0.2) |
0.43 kg / 0.94 lbs
426.0 g / 4.2 N
|
| 3 mm | Stal (~0.2) |
0.37 kg / 0.81 lbs
368.0 g / 3.6 N
|
| 5 mm | Stal (~0.2) |
0.27 kg / 0.59 lbs
268.0 g / 2.6 N
|
| 10 mm | Stal (~0.2) |
0.11 kg / 0.25 lbs
114.0 g / 1.1 N
|
| 15 mm | Stal (~0.2) |
0.05 kg / 0.11 lbs
48.0 g / 0.5 N
|
| 20 mm | Stal (~0.2) |
0.02 kg / 0.05 lbs
22.0 g / 0.2 N
|
| 30 mm | Stal (~0.2) |
0.01 kg / 0.01 lbs
6.0 g / 0.1 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
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 lbs
837.0 g / 8.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.56 kg / 1.23 lbs
558.0 g / 5.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.28 kg / 0.62 lbs
279.0 g / 2.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.40 kg / 3.08 lbs
1395.0 g / 13.7 N
|
Table 4: Steel thickness (saturation) - 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 lbs
279.0 g / 2.7 N
|
| 1 mm |
|
0.70 kg / 1.54 lbs
697.5 g / 6.8 N
|
| 2 mm |
|
1.40 kg / 3.08 lbs
1395.0 g / 13.7 N
|
| 3 mm |
|
2.09 kg / 4.61 lbs
2092.5 g / 20.5 N
|
| 5 mm |
|
2.79 kg / 6.15 lbs
2790.0 g / 27.4 N
|
| 10 mm |
|
2.79 kg / 6.15 lbs
2790.0 g / 27.4 N
|
| 11 mm |
|
2.79 kg / 6.15 lbs
2790.0 g / 27.4 N
|
| 12 mm |
|
2.79 kg / 6.15 lbs
2790.0 g / 27.4 N
|
Table 5: Thermal stability (stability) - thermal limit
MP 32x16x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.79 kg / 6.15 lbs
2790.0 g / 27.4 N
|
OK |
| 40 °C | -2.2% |
2.73 kg / 6.02 lbs
2728.6 g / 26.8 N
|
OK |
| 60 °C | -4.4% |
2.67 kg / 5.88 lbs
2667.2 g / 26.2 N
|
OK |
| 80 °C | -6.6% |
2.61 kg / 5.74 lbs
2605.9 g / 25.6 N
|
|
| 100 °C | -28.8% |
1.99 kg / 4.38 lbs
1986.5 g / 19.5 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MP 32x16x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
128.78 kg / 283.90 lbs
6 014 Gs
|
19.32 kg / 42.59 lbs
19317 g / 189.5 N
|
N/A |
| 1 mm |
120.86 kg / 266.44 lbs
10 757 Gs
|
18.13 kg / 39.97 lbs
18128 g / 177.8 N
|
108.77 kg / 239.80 lbs
~0 Gs
|
| 2 mm |
113.03 kg / 249.19 lbs
10 403 Gs
|
16.95 kg / 37.38 lbs
16954 g / 166.3 N
|
101.73 kg / 224.27 lbs
~0 Gs
|
| 3 mm |
105.49 kg / 232.56 lbs
10 050 Gs
|
15.82 kg / 34.88 lbs
15823 g / 155.2 N
|
94.94 kg / 209.31 lbs
~0 Gs
|
| 5 mm |
91.34 kg / 201.37 lbs
9 352 Gs
|
13.70 kg / 30.21 lbs
13701 g / 134.4 N
|
82.21 kg / 181.23 lbs
~0 Gs
|
| 10 mm |
61.88 kg / 136.41 lbs
7 697 Gs
|
9.28 kg / 20.46 lbs
9281 g / 91.0 N
|
55.69 kg / 122.77 lbs
~0 Gs
|
| 20 mm |
26.38 kg / 58.16 lbs
5 026 Gs
|
3.96 kg / 8.72 lbs
3957 g / 38.8 N
|
23.74 kg / 52.35 lbs
~0 Gs
|
| 50 mm |
2.35 kg / 5.17 lbs
1 499 Gs
|
0.35 kg / 0.78 lbs
352 g / 3.5 N
|
2.11 kg / 4.66 lbs
~0 Gs
|
| 60 mm |
1.19 kg / 2.63 lbs
1 069 Gs
|
0.18 kg / 0.39 lbs
179 g / 1.8 N
|
1.07 kg / 2.37 lbs
~0 Gs
|
| 70 mm |
0.65 kg / 1.42 lbs
786 Gs
|
0.10 kg / 0.21 lbs
97 g / 1.0 N
|
0.58 kg / 1.28 lbs
~0 Gs
|
| 80 mm |
0.37 kg / 0.81 lbs
594 Gs
|
0.06 kg / 0.12 lbs
55 g / 0.5 N
|
0.33 kg / 0.73 lbs
~0 Gs
|
| 90 mm |
0.22 kg / 0.49 lbs
459 Gs
|
0.03 kg / 0.07 lbs
33 g / 0.3 N
|
0.20 kg / 0.44 lbs
~0 Gs
|
| 100 mm |
0.14 kg / 0.30 lbs
362 Gs
|
0.02 kg / 0.05 lbs
21 g / 0.2 N
|
0.12 kg / 0.27 lbs
~0 Gs
|
Table 7: Hazards (implants) - 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 |
| Car key | 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: Collisions (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: Construction 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. Wall mount (shear)
*Caution: On a vertical surface, the magnet retains only a fraction of its max power.
2. Steel saturation
*Thin metal sheet (e.g. computer case) significantly reduces the holding force.
3. Thermal stability
*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) = 0.90
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Pros and cons of Nd2Fe14B magnets.
Advantages
- They do not lose strength, even after approximately 10 years – the decrease in power is only ~1% (theoretically),
- They are noted for resistance to demagnetization induced by external field influence,
- The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- They feature high magnetic induction at the operating surface, which increases their power,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Considering the option of free shaping and adaptation to custom projects, neodymium magnets can be manufactured in a broad palette of geometric configurations, which increases their versatility,
- Versatile presence in electronics industry – they are commonly used in computer drives, electric motors, diagnostic systems, as well as other advanced devices.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Weaknesses
- Brittleness 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 raises their durability
- Neodymium magnets lose their force 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 suggest a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex shapes.
- Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these devices can complicate diagnosis medical in case of swallowing.
- Due to complex production process, their price exceeds standard values,
Lifting parameters
Magnetic strength at its maximum – what contributes to it?
- with the contact of a sheet made of special test steel, ensuring full magnetic saturation
- possessing a thickness of at least 10 mm to ensure full flux closure
- with a surface cleaned and smooth
- under conditions of ideal adhesion (metal-to-metal)
- for force acting at a right angle (pull-off, not shear)
- in neutral thermal conditions
Determinants of lifting force in real conditions
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
- Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
- Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Metal type – different alloys attracts identically. High carbon content worsen the attraction effect.
- Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).
Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.
H&S for magnets
Metal Allergy
Allergy Notice: The Ni-Cu-Ni coating contains nickel. If an allergic reaction appears, cease working with magnets and use protective gear.
Risk of cracking
Protect your eyes. Magnets can explode upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.
Magnetic media
Very strong magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Stay away of min. 10 cm.
Bone fractures
Watch your fingers. Two powerful magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Be careful!
Respect the power
Exercise caution. Neodymium magnets attract from a long distance and connect with huge force, often faster than you can react.
Dust explosion hazard
Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.
Danger to pacemakers
Life threat: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.
Threat to navigation
An intense magnetic field negatively affects the operation of magnetometers in smartphones and GPS navigation. Maintain magnets near a smartphone to prevent breaking the sensors.
Demagnetization risk
Do not overheat. NdFeB magnets are sensitive to heat. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).
Do not give to children
Product intended for adults. Small elements can be swallowed, causing serious injuries. Store out of reach of kids and pets.
