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
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
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Need more?Frequently asked questions
What is the hole in a ring magnet for?
What is the polarisation?
What sizes are available?
Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Technical details - 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 simulation of the magnet - report
These values represent the result of a engineering simulation. Values were calculated on algorithms for the class Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Use these calculations as a reference point for designers.
Table 1: Static pull force (pull vs gap) - power drop
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 pounds
750.0 g / 7.4 N
|
safe |
| 1 mm |
3295 Gs
329.5 mT
|
0.29 kg / 0.63 pounds
287.5 g / 2.8 N
|
safe |
| 2 mm |
1883 Gs
188.3 mT
|
0.09 kg / 0.21 pounds
93.9 g / 0.9 N
|
safe |
| 3 mm |
1098 Gs
109.8 mT
|
0.03 kg / 0.07 pounds
31.9 g / 0.3 N
|
safe |
| 5 mm |
440 Gs
44.0 mT
|
0.01 kg / 0.01 pounds
5.1 g / 0.1 N
|
safe |
| 10 mm |
92 Gs
9.2 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
safe |
| 15 mm |
33 Gs
3.3 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 20 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 30 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Slippage capacity (vertical surface)
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 pounds
150.0 g / 1.5 N
|
| 1 mm | Stal (~0.2) |
0.06 kg / 0.13 pounds
58.0 g / 0.6 N
|
| 2 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
18.0 g / 0.2 N
|
| 3 mm | Stal (~0.2) |
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - 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 pounds
225.0 g / 2.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.15 kg / 0.33 pounds
150.0 g / 1.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.08 kg / 0.17 pounds
75.0 g / 0.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.38 kg / 0.83 pounds
375.0 g / 3.7 N
|
Table 4: Material efficiency (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 pounds
75.0 g / 0.7 N
|
| 1 mm |
|
0.19 kg / 0.41 pounds
187.5 g / 1.8 N
|
| 2 mm |
|
0.38 kg / 0.83 pounds
375.0 g / 3.7 N
|
| 3 mm |
|
0.56 kg / 1.24 pounds
562.5 g / 5.5 N
|
| 5 mm |
|
0.75 kg / 1.65 pounds
750.0 g / 7.4 N
|
| 10 mm |
|
0.75 kg / 1.65 pounds
750.0 g / 7.4 N
|
| 11 mm |
|
0.75 kg / 1.65 pounds
750.0 g / 7.4 N
|
| 12 mm |
|
0.75 kg / 1.65 pounds
750.0 g / 7.4 N
|
Table 5: Thermal stability (material behavior) - power drop
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 pounds
750.0 g / 7.4 N
|
OK |
| 40 °C | -2.2% |
0.73 kg / 1.62 pounds
733.5 g / 7.2 N
|
OK |
| 60 °C | -4.4% |
0.72 kg / 1.58 pounds
717.0 g / 7.0 N
|
OK |
| 80 °C | -6.6% |
0.70 kg / 1.54 pounds
700.5 g / 6.9 N
|
|
| 100 °C | -28.8% |
0.53 kg / 1.18 pounds
534.0 g / 5.2 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 5x2.7/1.2x5 S / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.75 kg / 6.06 pounds
5 924 Gs
|
0.41 kg / 0.91 pounds
412 g / 4.0 N
|
N/A |
| 1 mm |
1.77 kg / 3.90 pounds
8 541 Gs
|
0.27 kg / 0.58 pounds
265 g / 2.6 N
|
1.59 kg / 3.51 pounds
~0 Gs
|
| 2 mm |
1.05 kg / 2.32 pounds
6 590 Gs
|
0.16 kg / 0.35 pounds
158 g / 1.5 N
|
0.95 kg / 2.09 pounds
~0 Gs
|
| 3 mm |
0.60 kg / 1.33 pounds
4 992 Gs
|
0.09 kg / 0.20 pounds
91 g / 0.9 N
|
0.54 kg / 1.20 pounds
~0 Gs
|
| 5 mm |
0.20 kg / 0.44 pounds
2 860 Gs
|
0.03 kg / 0.07 pounds
30 g / 0.3 N
|
0.18 kg / 0.39 pounds
~0 Gs
|
| 10 mm |
0.02 kg / 0.04 pounds
880 Gs
|
0.00 kg / 0.01 pounds
3 g / 0.0 N
|
0.02 kg / 0.04 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 pounds
184 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
16 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
10 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
6 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
4 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
3 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
2 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Protective zones (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: Collisions (cracking risk) - collision effects
MP 5x2.7/1.2x5 S / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
16.76 km/h
(4.65 m/s)
|
0.01 J | |
| 30 mm |
16.76 km/h
(4.66 m/s)
|
0.01 J | |
| 50 mm |
16.76 km/h
(4.66 m/s)
|
0.01 J | |
| 100 mm |
16.76 km/h
(4.66 m/s)
|
0.01 J |
Table 9: Surface protection spec
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: Submerged application
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. Vertical hold
*Caution: On a vertical wall, the magnet holds just a fraction of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.
3. Power loss vs temp
*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) = 0.83
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros and cons of neodymium magnets.
Benefits
- They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
- They possess excellent resistance to magnetic field loss due to external fields,
- In other words, due to the metallic finish of nickel, the element gains visual value,
- Magnetic induction on the working layer of the magnet turns out to be very high,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
- Possibility of accurate modeling as well as adjusting to concrete applications,
- Key role in modern industrial fields – they are used in hard drives, electric drive systems, medical devices, and industrial machines.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
Cons
- To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Due to limitations in producing threads and complicated shapes in magnets, we recommend using a housing - magnetic mechanism.
- Potential hazard resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child health protection. It is also worth noting that tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
- With budget limitations the cost of neodymium magnets is economically unviable,
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what affects it?
- on a block made of structural steel, perfectly concentrating the magnetic flux
- with a thickness no less than 10 mm
- characterized by lack of roughness
- under conditions of gap-free contact (surface-to-surface)
- for force applied at a right angle (pull-off, not shear)
- at ambient temperature room level
Determinants of practical lifting force of a magnet
- Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
- Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet holds much less (often approx. 20-30% of maximum force).
- Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Chemical composition of the base – mild steel gives the best results. Alloy steels decrease magnetic properties and lifting capacity.
- Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
- Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the holding force is lower. In addition, even a slight gap between the magnet and the plate lowers the load capacity.
Safe handling of NdFeB magnets
Keep away from electronics
An intense magnetic field disrupts the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.
Safe distance
Equipment safety: Neodymium magnets can damage payment cards and sensitive devices (heart implants, hearing aids, mechanical watches).
No play value
Only for adults. Small elements pose a choking risk, leading to serious injuries. Keep out of reach of kids and pets.
Fragile material
Neodymium magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets will cause them breaking into shards.
Crushing force
Danger of trauma: The attraction force is so great that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.
Safe operation
Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.
Do not overheat magnets
Control the heat. Heating the magnet to high heat will ruin its magnetic structure and strength.
Allergy Warning
Some people have a contact allergy to Ni, which is the standard coating for NdFeB magnets. Frequent touching can result in skin redness. It is best to wear protective gloves.
ICD Warning
Patients with a ICD have to keep an safe separation from magnets. The magnetism can interfere with the operation of the life-saving device.
Dust explosion hazard
Dust generated during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.
