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MP 60x20x5 / N38 - ring magnet

ring magnet

Catalog no 030204

GTIN/EAN: 5906301812210

5.00

Diameter

60 mm [±0,1 mm]

internal diameter Ø

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

94.25 g

Magnetization Direction

↑ axial

Load capacity

9.41 kg / 92.27 N

Magnetic Induction

101.92 mT / 1019 Gs

Coating

[NiCuNi] Nickel

technical specifications »

47.99 ZŁ with VAT / pcs + price for transport

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Lifting power and structure of a neodymium magnet can be verified with our magnetic mass calculator.

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Technical details - MP 60x20x5 / N38 - ring magnet

Specification / characteristics - MP 60x20x5 / N38 - ring magnet

properties
properties values
Cat. no. 030204
GTIN/EAN 5906301812210
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 60 mm [±0,1 mm]
internal diameter Ø 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 94.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 9.41 kg / 92.27 N
Magnetic Induction ~ ? 101.92 mT / 1019 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 60x20x5 / 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 product - report

Presented values constitute the direct effect of a engineering analysis. Values rely on models for the material Nd2Fe14B. Actual performance might slightly differ. Please consider these calculations as a reference point when designing systems.

Table 1: Static force (force vs gap) - characteristics
MP 60x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4541 Gs
454.1 mT
 9.41 kg / 20.75 LBS
9410.0 g / 92.3 N
 warning
1 mm 4400 Gs
440.0 mT
 8.83 kg / 19.47 LBS
8832.4 g / 86.6 N
 warning
2 mm 4254 Gs
425.4 mT
 8.26 kg / 18.21 LBS
8258.2 g / 81.0 N
 warning
3 mm 4107 Gs
410.7 mT
 7.70 kg / 16.97 LBS
7697.5 g / 75.5 N
 warning
5 mm 3812 Gs
381.2 mT
 6.63 kg / 14.62 LBS
6630.0 g / 65.0 N
 warning
10 mm 3097 Gs
309.7 mT
 4.38 kg / 9.65 LBS
4375.1 g / 42.9 N
 warning
15 mm 2463 Gs
246.3 mT
 2.77 kg / 6.10 LBS
2767.8 g / 27.2 N
 warning
20 mm 1939 Gs
193.9 mT
 1.72 kg / 3.78 LBS
1715.2 g / 16.8 N
 weak grip
30 mm 1202 Gs
120.2 mT
 0.66 kg / 1.45 LBS
659.2 g / 6.5 N
 weak grip
50 mm 509 Gs
50.9 mT
 0.12 kg / 0.26 LBS
118.0 g / 1.2 N
 weak grip
Magnetic force drops significantly with every subsequent millimeter of gap. Keep in mind that every additional insulation layer (e.g., dirt, varnish, dust) noticeably weakens the grip. Neodymiums operate strongest in perfect adhesion; air break weakens the power. Notice how flashily the parameters drop, when the magnet does not touch tightly to the metal substrate. When planning the mounting, avoid additional spacers.

Table 2: Vertical load (wall)
MP 60x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.88 kg / 4.15 LBS
1882.0 g / 18.5 N
1 mm Stal (~0.2) 1.77 kg / 3.89 LBS
1766.0 g / 17.3 N
2 mm Stal (~0.2) 1.65 kg / 3.64 LBS
1652.0 g / 16.2 N
3 mm Stal (~0.2) 1.54 kg / 3.40 LBS
1540.0 g / 15.1 N
5 mm Stal (~0.2) 1.33 kg / 2.92 LBS
1326.0 g / 13.0 N
10 mm Stal (~0.2) 0.88 kg / 1.93 LBS
876.0 g / 8.6 N
15 mm Stal (~0.2) 0.55 kg / 1.22 LBS
554.0 g / 5.4 N
20 mm Stal (~0.2) 0.34 kg / 0.76 LBS
344.0 g / 3.4 N
30 mm Stal (~0.2) 0.13 kg / 0.29 LBS
132.0 g / 1.3 N
50 mm Stal (~0.2) 0.02 kg / 0.05 LBS
24.0 g / 0.2 N
The table below defines the estimated shear load required to start the shifting of the magnet downwards along a vertical metal surface (assuming standard friction coefficient). The holding force is relative to the gap size between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MP 60x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.82 kg / 6.22 LBS
2823.0 g / 27.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.88 kg / 4.15 LBS
1882.0 g / 18.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.94 kg / 2.07 LBS
941.0 g / 9.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.71 kg / 10.37 LBS
4705.0 g / 46.2 N
When hanging a holder on a upright surface (e.g., a car body), it will only hold only approx. 20%-30% of nominal attraction strength. Gravity and a low friction coefficient influence the fact that products slip faster than they detach. Planning a vertical fastening? Consider that the sliding force is significantly lower than the perpendicular breakaway force. On a painted metal, the holder will slide down under a much lighter cargo. Utilizing a rubberized layer can drastically increase the grip.

Table 4: Steel thickness (saturation) - power losses
MP 60x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.94 kg / 2.07 LBS
941.0 g / 9.2 N
1 mm
25%
 2.35 kg / 5.19 LBS
2352.5 g / 23.1 N
2 mm
50%
 4.71 kg / 10.37 LBS
4705.0 g / 46.2 N
3 mm
75%
 7.06 kg / 15.56 LBS
7057.5 g / 69.2 N
5 mm
100%
 9.41 kg / 20.75 LBS
9410.0 g / 92.3 N
10 mm
100%
 9.41 kg / 20.75 LBS
9410.0 g / 92.3 N
11 mm
100%
 9.41 kg / 20.75 LBS
9410.0 g / 92.3 N
12 mm
100%
 9.41 kg / 20.75 LBS
9410.0 g / 92.3 N
A thin sheet is incapable of take in the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a thin surface, the flux will penetrate right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's power, you require a sufficiently solid element of steel. The saturation effect causes that on thin elements (e.g., appliance housings), the holder works worse. We advise picking the steel dimension according to the table below.

Table 5: Thermal resistance (material behavior) - thermal limit
MP 60x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 9.41 kg / 20.75 LBS
9410.0 g / 92.3 N
 OK
40 °C -2.2% 9.20 kg / 20.29 LBS
9203.0 g / 90.3 N
 OK
60 °C -4.4% 9.00 kg / 19.83 LBS
8996.0 g / 88.3 N
 OK
80 °C -6.6% 8.79 kg / 19.38 LBS
8788.9 g / 86.2 N
100 °C -28.8% 6.70 kg / 14.77 LBS
6699.9 g / 65.7 N
Ordinary NdFeB products irreversibly lose strength after exceeding the maximum temperature. Protect against heat – heat can irreversibly destroy this magnet. With every degree above norm, the magnet's power momentarily decreases. Avoid using this magnet close to ovens exceeding its operating temperature limit. Ignoring the limit will result in permanent loss of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) may lose charge permanently under lower heat stress than taller cylinders. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field range
MP 60x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 303.46 kg / 669.01 LBS
5 621 Gs
45.52 kg / 100.35 LBS
45519 g / 446.5 N
 N/A
1 mm 294.21 kg / 648.62 LBS
8 943 Gs
44.13 kg / 97.29 LBS
44132 g / 432.9 N
 264.79 kg / 583.76 LBS
~0 Gs
2 mm 284.83 kg / 627.94 LBS
8 800 Gs
42.72 kg / 94.19 LBS
42725 g / 419.1 N
 256.35 kg / 565.15 LBS
~0 Gs
3 mm 275.53 kg / 607.43 LBS
8 655 Gs
41.33 kg / 91.11 LBS
41329 g / 405.4 N
 247.97 kg / 546.69 LBS
~0 Gs
5 mm 257.21 kg / 567.06 LBS
8 362 Gs
38.58 kg / 85.06 LBS
38582 g / 378.5 N
 231.49 kg / 510.35 LBS
~0 Gs
10 mm 213.81 kg / 471.36 LBS
7 624 Gs
32.07 kg / 70.70 LBS
32071 g / 314.6 N
 192.43 kg / 424.23 LBS
~0 Gs
20 mm 141.09 kg / 311.05 LBS
6 193 Gs
21.16 kg / 46.66 LBS
21164 g / 207.6 N
 126.98 kg / 279.95 LBS
~0 Gs
50 mm 34.15 kg / 75.30 LBS
3 047 Gs
5.12 kg / 11.29 LBS
5123 g / 50.3 N
 30.74 kg / 67.77 LBS
~0 Gs
60 mm 21.26 kg / 46.87 LBS
2 404 Gs
3.19 kg / 7.03 LBS
3189 g / 31.3 N
 19.13 kg / 42.18 LBS
~0 Gs
70 mm 13.43 kg / 29.61 LBS
1 911 Gs
2.01 kg / 4.44 LBS
2015 g / 19.8 N
 12.09 kg / 26.65 LBS
~0 Gs
80 mm 8.65 kg / 19.06 LBS
1 533 Gs
1.30 kg / 2.86 LBS
1297 g / 12.7 N
 7.78 kg / 17.16 LBS
~0 Gs
90 mm 5.68 kg / 12.52 LBS
1 243 Gs
0.85 kg / 1.88 LBS
852 g / 8.4 N
 5.11 kg / 11.27 LBS
~0 Gs
100 mm 3.81 kg / 8.39 LBS
1 017 Gs
0.57 kg / 1.26 LBS
571 g / 5.6 N
 3.43 kg / 7.55 LBS
~0 Gs
Two strong neodymiums interact from a much further distance than a magnet and sheet combination. Such a system of magnet-to-magnet produces a massive flux and a wider radius of operation. Designing a strong closure? Apply two magnets instead of a neodymium and a steel. Remember that when connecting a pair of magnets, the impact force is massive. The levitation is a bit weaker than the connection force, but still impressive.
*Flux density in repulsion mode drops to ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Note: Estimates demonstrate shear force of a pair of matching magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - warnings
MP 60x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 31.5 cm
Hearing aid 10 Gs (1.0 mT) 24.5 cm
Mechanical watch 20 Gs (2.0 mT) 19.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 15.0 cm
Remote 50 Gs (5.0 mT) 14.0 cm
Payment card 400 Gs (40.0 mT) 6.0 cm
HDD hard drive 600 Gs (60.0 mT) 5.0 cm
Powerful magnet radiation poses a serious hazard to IT equipment and pacemakers. These NdFeB products produce a field that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field acts through matter and housings. Exceptional care must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
MP 60x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 12.67 km/h
(3.52 m/s)
 0.58 J
30 mm 18.20 km/h
(5.06 m/s)
 1.20 J
50 mm 22.71 km/h
(6.31 m/s)
 1.88 J
100 mm 31.88 km/h
(8.85 m/s)
 3.70 J
Magnetic elements are very brittle – a collision with steel can result in shattering. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Impact energy can trigger coating fragments or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when working with large magnets.

Table 9: Anti-corrosion coating durability
MP 60x20x5 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MP 60x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 109 640 Mx 1096.4 µWb
Pc Coefficient 0.62 High (Stable)
Flux value passing through the magnet pole. Essential parameter in coil applications as well as sensors. Pc value defines the working geometry.

Table 11: Submerged application
MP 60x20x5 / N38

Environment Effective steel pull Effect
Air (land) 9.41 kg Standard
Water (riverbed) 10.77 kg
(+1.36 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. 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)

*Warning: On a vertical surface, the magnet holds only approx. 20-30% of its max power.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Heat tolerance

*For N38 grade, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.62

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%
Ecology and recycling (GPSR)
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: 030204-2026
Magnet Unit Converter
Force (pull)
Field Strength
Type a value in one of the inputs, and the remaining fields will update in real-time.

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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. Mounting is clean and reversible, unlike gluing. It is also often used in advertising for fixing signs and in workshops for organizing tools.
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. In the place of the mounting hole, the coating is thinner and can be damaged when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.
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 (60 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø60x5 mm and a weight of 94.25 g. The pulling force of this model is an impressive 9.41 kg, which translates to 92.27 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 20 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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.

Pros as well as cons of Nd2Fe14B magnets.

Pros

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They do not lose magnetism, even after approximately ten years – the reduction in lifting capacity is only ~1% (according to tests),
  • Neodymium magnets are distinguished by exceptionally resistant to loss of magnetic properties caused by external magnetic fields,
  • Thanks to the shiny finish, the surface of nickel, gold, or silver gives an modern appearance,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
  • Due to the option of precise molding and customization to individualized solutions, neodymium magnets can be created in a broad palette of geometric configurations, which increases their versatility,
  • Key role in high-tech industry – they are used in mass storage devices, electric motors, medical devices, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in small systems

Disadvantages

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength 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
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making nuts in the magnet and complicated forms - preferred is casing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Furthermore, small components of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Best holding force of the magnet in ideal parameters – what contributes to it?

The force parameter is a result of laboratory testing executed under the following configuration:
  • on a plate made of structural steel, perfectly concentrating the magnetic field
  • with a thickness no less than 10 mm
  • with an ground contact surface
  • without any air gap between the magnet and steel
  • under perpendicular application of breakaway force (90-degree angle)
  • at temperature room level

Determinants of lifting force in real conditions

Effective lifting capacity is affected by specific conditions, including (from priority):
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Plate material – mild steel attracts best. Alloy admixtures decrease magnetic properties and holding force.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, in contrast under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet and the plate reduces the holding force.

H&S for magnets
This is not a toy

NdFeB magnets are not suitable for play. Eating multiple magnets may result in them attracting across intestines, which poses a severe health hazard and requires urgent medical intervention.

Threat to navigation

GPS units and mobile phones are highly susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Physical harm

Big blocks can break fingers in a fraction of a second. Under no circumstances put your hand between two strong magnets.

Warning for heart patients

People with a pacemaker must maintain an safe separation from magnets. The magnetism can disrupt the operation of the implant.

Heat sensitivity

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its properties and strength.

Flammability

Combustion risk: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.

Warning for allergy sufferers

Some people suffer from a sensitization to Ni, which is the typical protective layer for neodymium magnets. Extended handling can result in skin redness. It is best to use safety gloves.

Caution required

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Beware of splinters

Beware of splinters. Magnets can explode upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Keep away from computers

Device Safety: Strong magnets can ruin data carriers and delicate electronics (pacemakers, hearing aids, mechanical watches).

Important! Looking for details? Check our post: Why are neodymium magnets dangerous?