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MP 5x2.7/1.2x5 S / N38 - ring magnet

ring magnet

Catalog no 030202

GTIN/EAN: 5906301812197

5.00

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

view parameters »

0.836 ZŁ with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

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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
properties values
Cat. no. 030202
GTIN/EAN 5906301812197
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
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

Specification / characteristics MP 5x2.7/1.2x5 S / N38 - ring magnet
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

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 analysis of the product - technical parameters

The following information are the direct effect of a engineering analysis. Results rely on algorithms for the material Nd2Fe14B. Operational parameters may deviate from the simulation results. Use these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - 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
 low risk
1 mm 3295 Gs
329.5 mT
 0.29 kg / 0.63 pounds
287.5 g / 2.8 N
 low risk
2 mm 1883 Gs
188.3 mT
 0.09 kg / 0.21 pounds
93.9 g / 0.9 N
 low risk
3 mm 1098 Gs
109.8 mT
 0.03 kg / 0.07 pounds
31.9 g / 0.3 N
 low risk
5 mm 440 Gs
44.0 mT
 0.01 kg / 0.01 pounds
5.1 g / 0.1 N
 low risk
10 mm 92 Gs
9.2 mT
 0.00 kg / 0.00 pounds
0.2 g / 0.0 N
 low risk
15 mm 33 Gs
3.3 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
20 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
30 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Magnetic force drops sharply per each millimeter of spacing. Remember that even a microscopic distance (e.g., dirt, varnish, veneer) noticeably weakens the grip. Magnetic products work strongest during direct contact; air break drastically cuts the force. See how quickly the load capacity fall, when the magnet does not touch flatly to the steel surface. When designing the assembly, avoid redundant distances.

Table 2: Slippage load (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
The table below defines the approximate shear load required to initiate the shifting of the magnet downwards along a upright metal surface (assuming standard friction coefficient). This parameter depends on the distance between the magnet and the surface.

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
When mounting a element on a vertical wall (e.g., a board), it will maintain just about 20%-30% of its maximum pull force. Gravity and a low friction coefficient cause that products move down faster than they pull off. Designing a hanger? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will slip down under a much lighter load. Utilizing a rubberized pad can effectively increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 5x2.7/1.2x5 S / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.08 kg / 0.17 pounds
75.0 g / 0.7 N
1 mm
25%
 0.19 kg / 0.41 pounds
187.5 g / 1.8 N
2 mm
50%
 0.38 kg / 0.83 pounds
375.0 g / 3.7 N
3 mm
75%
 0.56 kg / 1.24 pounds
562.5 g / 5.5 N
5 mm
100%
 0.75 kg / 1.65 pounds
750.0 g / 7.4 N
10 mm
100%
 0.75 kg / 1.65 pounds
750.0 g / 7.4 N
11 mm
100%
 0.75 kg / 1.65 pounds
750.0 g / 7.4 N
12 mm
100%
 0.75 kg / 1.65 pounds
750.0 g / 7.4 N
A too thin steel cannot absorb the full magnetic flux, which squanders power of the holder. If you attach a powerful product to a thin surface, the flux will pass right through and the attraction force will be weaker. To achieve full efficiency of this neodymium's power, you need a suitably thick backing of steel. The material oversaturation means that on sheet metal structures (e.g., appliance housings), the product works worse. We recommend selecting the steel cross-section from these parameters.

Table 5: Working in heat (material behavior) - thermal limit
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
Classic neodymiums change their properties power above the temperature limit. Avoid high temperatures – high temperature can permanently demagnetize this magnet. As the temperature rises, the neodymium's capacity momentarily lowers. Refrain from using this magnet near heat sources higher than its safe range. Exceeding the critical threshold will lead to permanent loss of magnetism.
*Important note: Temperature resistance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than taller cylinders. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
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 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
Two magnetic products attract each other from a significantly greater distance than a neodymium and metal combination. The setup of magnet-to-magnet creates a more powerful interaction and a larger range of performance. Planning to create a solid fastener? Apply two magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the impact force is massive. The levitation is slightly lower than the attraction, but still large.
*The magnetic induction for N-N configuration reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
* Results refer to shear force of two same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - 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
Car key 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
Extremely neodym field is a real danger to electronics and pacemakers. These NdFeB products produce a field that destroys function of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and housings. Exceptional care must be taken by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, car keys, speakers, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (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
Magnetic elements are very brittle – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely becomes dangerous. Impact energy can trigger coating fragments or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear eye protection when handling with powerful specimens.

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)
The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

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)
Total magnetic flux emitted by the magnet pole. Essential parameter for generator designers as well as sensors. The Pc coefficient determines the magnet's operating point.

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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Note: On a vertical surface, the magnet retains just a fraction of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. computer case) drastically limits the holding force.

3. Temperature resistance

*For N38 material, 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

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.

Technical specification and ecology
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
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 030202-2026
Quick Unit Converter
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Field Strength
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The ring magnet with a hole MP 5x2.7/1.2x5 S / N38 is created for permanent mounting, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. This product with a force of 0.75 kg works great as a cabinet closure, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 5x2.7/1.2x5 S / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a rubber spacer under the screw head, which will cushion the stresses. Remember: cracking during assembly results from material properties, not a product defect.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. This product is dedicated for inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
The inner hole diameter determines the maximum size of the mounting element. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø5 mm (outer diameter) and height 5 mm. The key parameter here is the lifting capacity amounting to approximately 0.75 kg (force ~7.31 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 2.7/1.2 mm.
The poles are located on the planes with holes, not on the sides of the ring. If you want two such magnets screwed with cones facing each other (faces) to attract, you must connect them with opposite poles (N to S). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of rare earth magnets.

Pros

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They do not lose power, even after nearly ten years – the decrease in strength is only ~1% (according to tests),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • Thanks to the glossy finish, the surface of Ni-Cu-Ni, gold, or silver gives an professional appearance,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to the possibility of free shaping and adaptation to individualized needs, neodymium magnets can be manufactured in a broad palette of forms and dimensions, which increases their versatility,
  • Universal use in future technologies – they find application in data components, motor assemblies, diagnostic systems, and complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Cons

Cons of neodymium magnets and proposals for their use:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We suggest cover - magnetic holder, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these devices are able to complicate diagnosis medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum magnetic pulling force – what affects it?

Magnet power is the result of a measurement for optimal configuration, assuming:
  • on a base made of mild steel, effectively closing the magnetic field
  • whose thickness is min. 10 mm
  • with a surface free of scratches
  • under conditions of ideal adhesion (surface-to-surface)
  • during pulling in a direction vertical to the plane
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

It is worth knowing that the application force may be lower depending on elements below, starting with the most relevant:
  • Air gap (between the magnet and the plate), because even a very small distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, corrosion or debris).
  • 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 typically several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel type – mild steel gives the best results. Alloy admixtures decrease magnetic properties and lifting capacity.
  • Surface quality – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was determined using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate reduces the load capacity.

Warnings
Threat to electronics

Data protection: Neodymium magnets can damage payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).

Threat to navigation

Navigation devices and smartphones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.

Implant safety

Warning for patients: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Hand protection

Pinching hazard: The attraction force is so immense that it can result in blood blisters, pinching, and even bone fractures. Use thick gloves.

Mechanical processing

Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Eye protection

Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Choking Hazard

Always keep magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are tragic.

Powerful field

Handle magnets with awareness. Their immense force can shock even experienced users. Be vigilant and respect their force.

Sensitization to coating

Nickel alert: The nickel-copper-nickel coating consists of nickel. If skin irritation happens, cease handling magnets and wear gloves.

Operating temperature

Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. Damage is permanent.

Warning! More info about risks in the article: Magnet Safety Guide.