MP 5x2.7/1.2x5 S / N38 - ring magnet
ring magnet
Catalog no 030202
GTIN/EAN: 5906301812197
Diameter
5 mm [±0,1 mm]
internal diameter Ø
2.7/1.2 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
0.69 g
Magnetization Direction
↑ axial
Load capacity
0.75 kg / 7.31 N
Magnetic Induction
553.14 mT / 5531 Gs
Coating
[NiCuNi] Nickel
0.836 ZŁ with VAT / pcs + price for transport
0.680 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical of the product - MP 5x2.7/1.2x5 S / N38 - ring magnet
Specification / characteristics - MP 5x2.7/1.2x5 S / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030202 |
| GTIN/EAN | 5906301812197 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 5 mm [±0,1 mm] |
| internal diameter Ø | 2.7/1.2 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 0.69 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.75 kg / 7.31 N |
| Magnetic Induction ~ ? | 553.14 mT / 5531 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 |
Engineering modeling of the magnet - report
These data are the outcome of a engineering analysis. Results were calculated on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ. Please consider these data as a reference point for designers.
Table 1: Static pull force (pull vs gap) - interaction chart
MP 5x2.7/1.2x5 S / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5322 Gs
532.2 mT
|
0.75 kg / 1.65 LBS
750.0 g / 7.4 N
|
weak grip |
| 1 mm |
3295 Gs
329.5 mT
|
0.29 kg / 0.63 LBS
287.5 g / 2.8 N
|
weak grip |
| 2 mm |
1883 Gs
188.3 mT
|
0.09 kg / 0.21 LBS
93.9 g / 0.9 N
|
weak grip |
| 3 mm |
1098 Gs
109.8 mT
|
0.03 kg / 0.07 LBS
31.9 g / 0.3 N
|
weak grip |
| 5 mm |
440 Gs
44.0 mT
|
0.01 kg / 0.01 LBS
5.1 g / 0.1 N
|
weak grip |
| 10 mm |
92 Gs
9.2 mT
|
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
|
weak grip |
| 15 mm |
33 Gs
3.3 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 20 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
Table 2: Vertical load (wall)
MP 5x2.7/1.2x5 S / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.15 kg / 0.33 LBS
150.0 g / 1.5 N
|
| 1 mm | Stal (~0.2) |
0.06 kg / 0.13 LBS
58.0 g / 0.6 N
|
| 2 mm | Stal (~0.2) |
0.02 kg / 0.04 LBS
18.0 g / 0.2 N
|
| 3 mm | Stal (~0.2) |
0.01 kg / 0.01 LBS
6.0 g / 0.1 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - vertical pull
MP 5x2.7/1.2x5 S / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.22 kg / 0.50 LBS
225.0 g / 2.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.15 kg / 0.33 LBS
150.0 g / 1.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.08 kg / 0.17 LBS
75.0 g / 0.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.38 kg / 0.83 LBS
375.0 g / 3.7 N
|
Table 4: Steel thickness (saturation) - power losses
MP 5x2.7/1.2x5 S / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.08 kg / 0.17 LBS
75.0 g / 0.7 N
|
| 1 mm |
|
0.19 kg / 0.41 LBS
187.5 g / 1.8 N
|
| 2 mm |
|
0.38 kg / 0.83 LBS
375.0 g / 3.7 N
|
| 3 mm |
|
0.56 kg / 1.24 LBS
562.5 g / 5.5 N
|
| 5 mm |
|
0.75 kg / 1.65 LBS
750.0 g / 7.4 N
|
| 10 mm |
|
0.75 kg / 1.65 LBS
750.0 g / 7.4 N
|
| 11 mm |
|
0.75 kg / 1.65 LBS
750.0 g / 7.4 N
|
| 12 mm |
|
0.75 kg / 1.65 LBS
750.0 g / 7.4 N
|
Table 5: Working in heat (material behavior) - resistance threshold
MP 5x2.7/1.2x5 S / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.75 kg / 1.65 LBS
750.0 g / 7.4 N
|
OK |
| 40 °C | -2.2% |
0.73 kg / 1.62 LBS
733.5 g / 7.2 N
|
OK |
| 60 °C | -4.4% |
0.72 kg / 1.58 LBS
717.0 g / 7.0 N
|
OK |
| 80 °C | -6.6% |
0.70 kg / 1.54 LBS
700.5 g / 6.9 N
|
|
| 100 °C | -28.8% |
0.53 kg / 1.18 LBS
534.0 g / 5.2 N
|
Table 6: Two magnets (repulsion) - forces in the system
MP 5x2.7/1.2x5 S / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.75 kg / 6.06 LBS
5 924 Gs
|
0.41 kg / 0.91 LBS
412 g / 4.0 N
|
N/A |
| 1 mm |
1.77 kg / 3.90 LBS
8 541 Gs
|
0.27 kg / 0.58 LBS
265 g / 2.6 N
|
1.59 kg / 3.51 LBS
~0 Gs
|
| 2 mm |
1.05 kg / 2.32 LBS
6 590 Gs
|
0.16 kg / 0.35 LBS
158 g / 1.5 N
|
0.95 kg / 2.09 LBS
~0 Gs
|
| 3 mm |
0.60 kg / 1.33 LBS
4 992 Gs
|
0.09 kg / 0.20 LBS
91 g / 0.9 N
|
0.54 kg / 1.20 LBS
~0 Gs
|
| 5 mm |
0.20 kg / 0.44 LBS
2 860 Gs
|
0.03 kg / 0.07 LBS
30 g / 0.3 N
|
0.18 kg / 0.39 LBS
~0 Gs
|
| 10 mm |
0.02 kg / 0.04 LBS
880 Gs
|
0.00 kg / 0.01 LBS
3 g / 0.0 N
|
0.02 kg / 0.04 LBS
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 LBS
184 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
16 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 LBS
10 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 LBS
6 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 LBS
4 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 LBS
3 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 LBS
2 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Hazards (electronics) - precautionary measures
MP 5x2.7/1.2x5 S / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 2.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 1.5 cm |
| Remote | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Dynamics (kinetic energy) - warning
MP 5x2.7/1.2x5 S / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
33.26 km/h
(9.24 m/s)
|
0.03 J | |
| 30 mm |
57.59 km/h
(16.00 m/s)
|
0.09 J | |
| 50 mm |
74.35 km/h
(20.65 m/s)
|
0.15 J | |
| 100 mm |
105.14 km/h
(29.21 m/s)
|
0.29 J |
Table 9: Coating parameters (durability)
MP 5x2.7/1.2x5 S / 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 5x2.7/1.2x5 S / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 862 Mx | 8.6 µWb |
| Pc Coefficient | 0.83 | High (Stable) |
Table 11: Physics of underwater searching
MP 5x2.7/1.2x5 S / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.75 kg | Standard |
| Water (riverbed) |
0.86 kg
(+0.11 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Note: On a vertical surface, the magnet retains only a fraction of its max power.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.
3. Temperature resistance
*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) = 0.83
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% |
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 Nd2Fe14B magnets.
Strengths
- They have stable power, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
- They are resistant to demagnetization induced by external magnetic fields,
- Thanks to the elegant finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an aesthetic appearance,
- The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
- Thanks to versatility in forming and the capacity to adapt to client solutions,
- Fundamental importance in innovative solutions – they are utilized in hard drives, drive modules, medical devices, as well as multitasking production systems.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Cons
- At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
- Due to limitations in realizing nuts and complex shapes in magnets, we propose using cover - magnetic holder.
- Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
- With mass production the cost of neodymium magnets is a challenge,
Pull force analysis
Maximum holding power of the magnet – what it depends on?
- using a sheet made of mild steel, functioning as a magnetic yoke
- whose transverse dimension equals approx. 10 mm
- characterized by smoothness
- with direct contact (without coatings)
- during pulling in a direction perpendicular to the mounting surface
- at temperature room level
Key elements affecting lifting force
- Distance – existence of foreign body (rust, dirt, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
- Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of nominal force).
- Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Steel grade – the best choice is high-permeability steel. Hardened steels may attract less.
- Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
- Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).
Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate lowers the lifting capacity.
Warnings
Swallowing risk
Only for adults. Tiny parts can be swallowed, causing serious injuries. Keep out of reach of children and animals.
Handling guide
Handle magnets with awareness. Their huge power can shock even professionals. Stay alert and do not underestimate their power.
Nickel allergy
Allergy Notice: The nickel-copper-nickel coating consists of nickel. If redness appears, immediately stop working with magnets and use protective gear.
Medical interference
For implant holders: Powerful magnets disrupt electronics. Keep at least 30 cm distance or request help to handle the magnets.
Impact on smartphones
Be aware: rare earth magnets produce a field that interferes with sensitive sensors. Maintain a safe distance from your mobile, device, and navigation systems.
Bone fractures
Watch your fingers. Two powerful magnets will snap together instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!
Beware of splinters
Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
Keep away from computers
Do not bring magnets near a wallet, computer, or TV. The magnetism can destroy these devices and erase data from cards.
Permanent damage
Keep cool. NdFeB magnets are sensitive to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).
Dust is flammable
Dust created during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.
