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

ring magnet

Catalog no 030201

GTIN/EAN: 5906301812180

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

see technical specifications »

0.836 ZŁ with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

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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 C / N38 - ring magnet

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

properties
properties values
Cat. no. 030201
GTIN/EAN 5906301812180
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 C / 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

Technical modeling of the magnet - data

These values are the direct effect of a mathematical calculation. Values were calculated on models for the class Nd2Fe14B. Real-world parameters might slightly differ. Treat these calculations as a supplementary guide for designers.

Table 1: Static pull force (force vs distance) - power drop
MP 5x2.7/1.2x5 C / 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
Magnetic force decreases sharply with every subsequent millimeter of spacing. Note that even a microscopic distance (e.g., dirt, paint, rust) strongly weakens the grip. Magnetic products hold strongest at the point of direct contact; air break drastically cuts the force. Analyze how flashily the parameters plummet, when the product does not adhere tightly to the metal substrate. When planning the arrangement, discard unnecessary gaps.

Table 2: Shear load (vertical surface)
MP 5x2.7/1.2x5 C / 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
This section presents the approximate shear load required to initiate the slippage of the magnet vertically along a upright steel plate (considering typical friction). This parameter is relative to the distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 5x2.7/1.2x5 C / 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 hanging a element on a upright surface (e.g., a car body), it will only hold only approx. 1/5 of its nominal power. Gravitational force as well as a weak degree of grip influence the fact that magnets slide down easier than they pull off. Designing a vertical fastening? Consider that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the element will slip down under a noticeably lighter weight. Utilizing a rubberized pad can significantly raise the stability.

Table 4: Steel thickness (saturation) - power losses
MP 5x2.7/1.2x5 C / 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 thin metal plate is unable to take in the entire magnetic field, which wastes potential of the magnet. If you mount a strong magnet to a thin surface, the field will penetrate right through and the pull force will drop sharply. To squeeze 100% of this magnet's power, you require a sufficiently solid backing of steel. The saturation effect causes that on thin elements (e.g., car bodies), the product holds weaker. We advise picking the steel thickness from these parameters.

Table 5: Working in heat (stability) - thermal limit
MP 5x2.7/1.2x5 C / 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
Standard neodymium magnets change their properties strength past the thermal threshold. Avoid high temperatures – high temperature can irreversibly demagnetize this product. With every degree above norm, the magnet's capacity temporarily drops. Refrain from using this product in hot environments higher than its operating temperature limit. Ignoring the limit will lead to irreversible degradation of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress than long magnets. Red status in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MP 5x2.7/1.2x5 C / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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 wider radius than a magnet and sheet setup. Such a system of magnet-to-magnet creates a more powerful interaction and a larger range of operation. Designing a strong closure? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when attracting two neodymiums, the pinch force is massive. The repulsion force is a bit weaker than the connection force, but still significant.
*Field value for N-N configuration is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Note: Figures refer to shear force of dual matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - precautionary measures
MP 5x2.7/1.2x5 C / 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
Extremely neodym field is a serious hazard to IT equipment as well as medical implants. These NdFeB products produce a field that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and glass. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
MP 5x2.7/1.2x5 C / 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 strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely becomes dangerous. Striking energy can trigger coating fragments or painful pinches to fingers. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Coating parameters (durability)
MP 5x2.7/1.2x5 C / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MP 5x2.7/1.2x5 C / N38

Parameter Value SI Unit / Description
Magnetic Flux 862 Mx 8.6 µWb
Pc Coefficient 0.83 High (Stable)
Flux value passing through the pole surface. Key data when building generators and motors. Pc value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MP 5x2.7/1.2x5 C / N38

Environment Effective steel pull Effect
Air (land) 0.75 kg Standard
Water (riverbed) 0.86 kg
(+0.11 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds only a fraction of its max power.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Thermal stability

*For N38 grade, 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.

Engineering data and GPSR
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%
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: 030201-2026
Quick Unit Converter
Magnet pull force
Magnetic Induction
Enter a number in one of the inputs, and the remaining units will recalculate on the fly.

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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Thanks to the hole (often for a screw), this model enables quick installation to wood, wall, plastic, or metal. This product with a force of 0.75 kg works great as a cabinet closure, speaker holder, or mounting element in devices.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for inside building use. For outdoor applications, we recommend choosing magnets in hermetic housing or additional protection with varnish.
The inner hole diameter determines the maximum size of the mounting element. If the magnet does not have a chamfer (cone), we recommend using a screw with a flat or cylindrical head, or possibly using a washer. Always check that the screw head is not larger than the outer diameter of the magnet (5 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø5x5 mm and a weight of 0.69 g. The pulling force of this model is an impressive 0.75 kg, which translates to 7.31 N in newtons. The mounting hole diameter is precisely 2.7/1.2 mm.
The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros as well as cons of neodymium magnets.

Benefits

Apart from their strong power, neodymium magnets have these key benefits:
  • They retain full power for around 10 years – the loss is just ~1% (in theory),
  • They retain their magnetic properties even under strong external field,
  • Thanks to the glossy finish, the coating of Ni-Cu-Ni, gold-plated, or silver gives an professional appearance,
  • Neodymium magnets create maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in forming and the capacity to customize to individual projects,
  • Universal use in electronics industry – they are used in HDD drives, brushless drives, medical equipment, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems

Weaknesses

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets decrease their force 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 advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in creating threads and complicated shapes in magnets, we recommend using cover - magnetic holder.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these magnets are able to complicate diagnosis medical after entering the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what contributes to it?

The load parameter shown concerns the limit force, obtained under laboratory conditions, specifically:
  • using a base made of mild steel, serving as a circuit closing element
  • with a thickness no less than 10 mm
  • with an ground touching surface
  • with direct contact (without paint)
  • during pulling in a direction vertical to the plane
  • in stable room temperature

Lifting capacity in practice – influencing factors

Please note that the application force may be lower depending on elements below, starting with the most relevant:
  • Clearance – the presence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Angle of force application – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – ideal substrate is pure iron steel. Cast iron may attract less.
  • Base smoothness – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, however under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Safety rules for work with NdFeB magnets
Powerful field

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Warning for heart patients

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Fire warning

Fire hazard: Neodymium dust is explosive. Do not process magnets in home conditions as this risks ignition.

Data carriers

Device Safety: Strong magnets can ruin payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Heat sensitivity

Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.

Sensitization to coating

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness happens, immediately stop handling magnets and wear gloves.

Shattering risk

Neodymium magnets are ceramic materials, meaning they are prone to chipping. Collision of two magnets will cause them shattering into small pieces.

Pinching danger

Large magnets can break fingers in a fraction of a second. Under no circumstances put your hand betwixt two strong magnets.

Phone sensors

A powerful magnetic field disrupts the operation of compasses in smartphones and GPS navigation. Keep magnets close to a smartphone to prevent damaging the sensors.

This is not a toy

NdFeB magnets are not suitable for play. Eating a few magnets can lead to them connecting inside the digestive tract, which constitutes a critical condition and requires immediate surgery.

Attention! Need more info? Read our article: Why are neodymium magnets dangerous?