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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Technical details - 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 modeling of the product - technical parameters
Presented information are the outcome of a physical calculation. Values are based on algorithms for the material Nd2Fe14B. Actual performance may differ from theoretical values. Please consider these data as a preliminary roadmap during assembly planning.
Table 1: Static pull force (pull vs distance) - 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 LBS
2790.0 g / 27.4 N
|
warning |
| 1 mm |
5202 Gs
520.2 mT
|
2.45 kg / 5.40 LBS
2448.8 g / 24.0 N
|
warning |
| 2 mm |
4850 Gs
485.0 mT
|
2.13 kg / 4.69 LBS
2128.7 g / 20.9 N
|
warning |
| 3 mm |
4504 Gs
450.4 mT
|
1.84 kg / 4.05 LBS
1836.3 g / 18.0 N
|
weak grip |
| 5 mm |
3849 Gs
384.9 mT
|
1.34 kg / 2.96 LBS
1340.5 g / 13.2 N
|
weak grip |
| 10 mm |
2513 Gs
251.3 mT
|
0.57 kg / 1.26 LBS
571.6 g / 5.6 N
|
weak grip |
| 15 mm |
1633 Gs
163.3 mT
|
0.24 kg / 0.53 LBS
241.2 g / 2.4 N
|
weak grip |
| 20 mm |
1087 Gs
108.7 mT
|
0.11 kg / 0.24 LBS
107.0 g / 1.0 N
|
weak grip |
| 30 mm |
535 Gs
53.5 mT
|
0.03 kg / 0.06 LBS
25.9 g / 0.3 N
|
weak grip |
| 50 mm |
181 Gs
18.1 mT
|
0.00 kg / 0.01 LBS
3.0 g / 0.0 N
|
weak grip |
Table 2: Sliding load (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: Wall mounting (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 (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 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: Working in heat (material behavior) - 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 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: Two magnets (repulsion) - 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 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: Protective zones (electronics) - precautionary measures
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 |
| Mobile device | 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: 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 (Flux)
MP 32x16x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 38 808 Mx | 388.1 µWb |
| Pc Coefficient | 0.90 | High (Stable) |
Table 11: Physics of underwater searching
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. Shear force
*Warning: On a vertical wall, the magnet holds only a fraction of its nominal pull.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) severely reduces the holding force.
3. Thermal stability
*For N38 grade, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.90
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros as well as cons of rare earth magnets.
Benefits
- They do not lose strength, even during around 10 years – the decrease in lifting capacity is only ~1% (theoretically),
- They have excellent resistance to magnetism drop when exposed to opposing magnetic fields,
- Thanks to the reflective finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an aesthetic appearance,
- Magnetic induction on the surface of the magnet remains maximum,
- 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...
- Possibility of custom machining and modifying to complex needs,
- Huge importance in electronics industry – they are used in mass storage devices, brushless drives, advanced medical instruments, also modern systems.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Cons
- At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
- We suggest a housing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex forms.
- Health risk resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these products can be problematic in diagnostics medical in case of swallowing.
- Due to neodymium price, their price exceeds standard values,
Pull force analysis
Maximum magnetic pulling force – what contributes to it?
- using a base made of mild steel, functioning as a circuit closing element
- possessing a massiveness of minimum 10 mm to avoid saturation
- characterized by lack of roughness
- without the slightest clearance between the magnet and steel
- under vertical force direction (90-degree angle)
- at conditions approx. 20°C
Lifting capacity in practice – influencing factors
- Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Angle of force application – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
- Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
- Material type – ideal substrate is pure iron steel. Hardened steels may generate lower lifting capacity.
- Base smoothness – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
- Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).
Lifting capacity was assessed using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet and the plate decreases the load capacity.
H&S for magnets
Serious injuries
Watch your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!
Powerful field
Handle with care. Rare earth magnets attract from a distance and connect with massive power, often quicker than you can react.
Warning for allergy sufferers
Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, prevent touching magnets with bare hands and select coated magnets.
Health Danger
Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.
Magnetic media
Do not bring magnets close to a purse, laptop, or screen. The magnetic field can destroy these devices and erase data from cards.
Heat sensitivity
Avoid heat. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, look for HT versions (H, SH, UH).
Fire risk
Powder generated during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.
Keep away from children
Absolutely keep magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are tragic.
GPS and phone interference
An intense magnetic field disrupts the operation of magnetometers in phones and GPS navigation. Do not bring magnets close to a device to avoid damaging the sensors.
Material brittleness
Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
