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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 »

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Detailed specification - 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

Engineering analysis of the assembly - data

These data represent the result of a physical simulation. Values rely on models for the class Nd2Fe14B. Actual performance may differ from theoretical values. Please consider these calculations as a reference point when designing systems.

Table 1: Static pull force (pull vs gap) - power drop
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 pounds
9410.0 g / 92.3 N
 medium risk
1 mm 4400 Gs
440.0 mT
 8.83 kg / 19.47 pounds
8832.4 g / 86.6 N
 medium risk
2 mm 4254 Gs
425.4 mT
 8.26 kg / 18.21 pounds
8258.2 g / 81.0 N
 medium risk
3 mm 4107 Gs
410.7 mT
 7.70 kg / 16.97 pounds
7697.5 g / 75.5 N
 medium risk
5 mm 3812 Gs
381.2 mT
 6.63 kg / 14.62 pounds
6630.0 g / 65.0 N
 medium risk
10 mm 3097 Gs
309.7 mT
 4.38 kg / 9.65 pounds
4375.1 g / 42.9 N
 medium risk
15 mm 2463 Gs
246.3 mT
 2.77 kg / 6.10 pounds
2767.8 g / 27.2 N
 medium risk
20 mm 1939 Gs
193.9 mT
 1.72 kg / 3.78 pounds
1715.2 g / 16.8 N
 safe
30 mm 1202 Gs
120.2 mT
 0.66 kg / 1.45 pounds
659.2 g / 6.5 N
 safe
50 mm 509 Gs
50.9 mT
 0.12 kg / 0.26 pounds
118.0 g / 1.2 N
 safe
Pulling power decreases significantly with every mm of distance. Keep in mind that even a microscopic distance (e.g., contamination, varnish, dust) strongly reduces the pull force. Magnetic products hold optimally during direct contact; gap weakens the power. Notice how rapidly the parameters plummet, when the product does not adhere tightly to the metal substrate. When planning the arrangement, discard unnecessary gaps.

Table 2: Slippage 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 pounds
1882.0 g / 18.5 N
1 mm Stal (~0.2) 1.77 kg / 3.89 pounds
1766.0 g / 17.3 N
2 mm Stal (~0.2) 1.65 kg / 3.64 pounds
1652.0 g / 16.2 N
3 mm Stal (~0.2) 1.54 kg / 3.40 pounds
1540.0 g / 15.1 N
5 mm Stal (~0.2) 1.33 kg / 2.92 pounds
1326.0 g / 13.0 N
10 mm Stal (~0.2) 0.88 kg / 1.93 pounds
876.0 g / 8.6 N
15 mm Stal (~0.2) 0.55 kg / 1.22 pounds
554.0 g / 5.4 N
20 mm Stal (~0.2) 0.34 kg / 0.76 pounds
344.0 g / 3.4 N
30 mm Stal (~0.2) 0.13 kg / 0.29 pounds
132.0 g / 1.3 N
50 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
The table below calculates the theoretical shear load needed to cause the shifting of the magnet vertically along a upright steel plate (considering standard friction coefficient). This parameter is a function of the gap size between the magnet and the surface.

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 pounds
2823.0 g / 27.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.88 kg / 4.15 pounds
1882.0 g / 18.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.94 kg / 2.07 pounds
941.0 g / 9.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.71 kg / 10.37 pounds
4705.0 g / 46.2 N
When placing a holder on a upright wall (e.g., a fridge), it will maintain only about 1/5 of its nominal power. Gravity as well as a low friction coefficient influence the fact that magnets slide down easier than they detach. Want to create a wall mount? Note that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the element will slip down under a much lighter cargo. Application of an anti-slip layer can effectively increase the grip.

Table 4: Steel thickness (substrate influence) - 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 pounds
941.0 g / 9.2 N
1 mm
25%
 2.35 kg / 5.19 pounds
2352.5 g / 23.1 N
2 mm
50%
 4.71 kg / 10.37 pounds
4705.0 g / 46.2 N
3 mm
75%
 7.06 kg / 15.56 pounds
7057.5 g / 69.2 N
5 mm
100%
 9.41 kg / 20.75 pounds
9410.0 g / 92.3 N
10 mm
100%
 9.41 kg / 20.75 pounds
9410.0 g / 92.3 N
11 mm
100%
 9.41 kg / 20.75 pounds
9410.0 g / 92.3 N
12 mm
100%
 9.41 kg / 20.75 pounds
9410.0 g / 92.3 N
A thin metal plate is unable to conduct the entire magnetic field, which weakens actual performance of the holder. If you attach a powerful product to a weak sheet, the field will pass right through and the pull force will drop sharply. To utilize the maximum of this magnet's potential, you require a sufficiently solid element of steel. The material oversaturation causes that on delicate walls (e.g., car bodies), the magnet shows lower pull force. We suggest choosing the steel dimension from these parameters.

Table 5: Working in heat (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 pounds
9410.0 g / 92.3 N
 OK
40 °C -2.2% 9.20 kg / 20.29 pounds
9203.0 g / 90.3 N
 OK
60 °C -4.4% 9.00 kg / 19.83 pounds
8996.0 g / 88.3 N
 OK
80 °C -6.6% 8.79 kg / 19.38 pounds
8788.9 g / 86.2 N
100 °C -28.8% 6.70 kg / 14.77 pounds
6699.9 g / 65.7 N
Classic neodymiums irreversibly lose strength after exceeding the maximum temperature. Protect against heat – heat can irreversibly demagnetize this product. With increasing heat, the magnet's power momentarily drops. Avoid using this product close to heaters exceeding its safe range. Exceeding the critical threshold will lead to destruction of magnetism.
*Important note: Heat tolerance is determined by both grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures compared to rod magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - 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 pounds
5 621 Gs
45.52 kg / 100.35 pounds
45519 g / 446.5 N
 N/A
1 mm 294.21 kg / 648.62 pounds
8 943 Gs
44.13 kg / 97.29 pounds
44132 g / 432.9 N
 264.79 kg / 583.76 pounds
~0 Gs
2 mm 284.83 kg / 627.94 pounds
8 800 Gs
42.72 kg / 94.19 pounds
42725 g / 419.1 N
 256.35 kg / 565.15 pounds
~0 Gs
3 mm 275.53 kg / 607.43 pounds
8 655 Gs
41.33 kg / 91.11 pounds
41329 g / 405.4 N
 247.97 kg / 546.69 pounds
~0 Gs
5 mm 257.21 kg / 567.06 pounds
8 362 Gs
38.58 kg / 85.06 pounds
38582 g / 378.5 N
 231.49 kg / 510.35 pounds
~0 Gs
10 mm 213.81 kg / 471.36 pounds
7 624 Gs
32.07 kg / 70.70 pounds
32071 g / 314.6 N
 192.43 kg / 424.23 pounds
~0 Gs
20 mm 141.09 kg / 311.05 pounds
6 193 Gs
21.16 kg / 46.66 pounds
21164 g / 207.6 N
 126.98 kg / 279.95 pounds
~0 Gs
50 mm 34.15 kg / 75.30 pounds
3 047 Gs
5.12 kg / 11.29 pounds
5123 g / 50.3 N
 30.74 kg / 67.77 pounds
~0 Gs
60 mm 21.26 kg / 46.87 pounds
2 404 Gs
3.19 kg / 7.03 pounds
3189 g / 31.3 N
 19.13 kg / 42.18 pounds
~0 Gs
70 mm 13.43 kg / 29.61 pounds
1 911 Gs
2.01 kg / 4.44 pounds
2015 g / 19.8 N
 12.09 kg / 26.65 pounds
~0 Gs
80 mm 8.65 kg / 19.06 pounds
1 533 Gs
1.30 kg / 2.86 pounds
1297 g / 12.7 N
 7.78 kg / 17.16 pounds
~0 Gs
90 mm 5.68 kg / 12.52 pounds
1 243 Gs
0.85 kg / 1.88 pounds
852 g / 8.4 N
 5.11 kg / 11.27 pounds
~0 Gs
100 mm 3.81 kg / 8.39 pounds
1 017 Gs
0.57 kg / 1.26 pounds
571 g / 5.6 N
 3.43 kg / 7.55 pounds
~0 Gs
Two magnets attract each other from a much further distance than a neodymium and metal combination. The setup of two magnets generates a stronger field and a further horizon of action. Planning to create a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is massive. The levitation is marginally weaker than the attraction, but still large.
*Flux density between like poles is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Note: Results demonstrate shear force of two identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - precautionary measures
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
Timepiece 20 Gs (2.0 mT) 19.5 cm
Mobile device 40 Gs (4.0 mT) 15.0 cm
Car key 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 large risk to electronics as well as medical implants. These NdFeB products produce a field that destroys function of sensitive medical devices. Notice: the unseen radiation passes through tissues and housings. Special caution must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
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
Neodymium magnets are delicate – a collision with steel risks their cracking. Control the attraction moment – a magnet released freely turns into a projectile. Kinetic force can destroy the magnet or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when working with powerful specimens.

Table 9: Corrosion resistance
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)
The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

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

Parameter Value SI Unit / Description
Magnetic Flux 109 640 Mx 1096.4 µWb
Pc Coefficient 0.62 High (Stable)
Total magnetic flux emitted by the magnet pole. Essential parameter in coil applications and motors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
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.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet retains just ~20% of its max power.

2. Plate thickness effect

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

3. Heat tolerance

*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) = 0.62

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.

Engineering data and GPSR
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%
Environmental data
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
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The ring-shaped magnet MP 60x20x5 / N38 is created for mechanical fastening, where glue might fail or be insufficient. 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.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. 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 indoor use. For outdoor applications, we recommend choosing magnets in hermetic housing or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 20 mm fits this model. 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.
It is a magnetic ring with a diameter of 60 mm and thickness 5 mm. 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages and disadvantages of rare earth magnets.

Advantages

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have stable power, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
  • Neodymium magnets are distinguished by extremely resistant to magnetic field loss caused by magnetic disturbances,
  • The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Magnets are distinguished by exceptionally strong magnetic induction on the surface,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of exact creating and optimizing to precise conditions,
  • Fundamental importance in high-tech industry – they serve a role in mass storage devices, electric motors, medical equipment, as well as modern systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Weaknesses

Characteristics of disadvantages of neodymium magnets and ways of using them
  • At strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend 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 magnets in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest a housing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex shapes.
  • Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices are able to complicate diagnosis medical in case of swallowing.
  • With mass production the cost of neodymium magnets is a challenge,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

The specified lifting capacity refers to the maximum value, obtained under ideal test conditions, meaning:
  • with the use of a sheet made of special test steel, ensuring full magnetic saturation
  • possessing a massiveness of min. 10 mm to avoid saturation
  • characterized by even structure
  • with direct contact (no paint)
  • during pulling in a direction perpendicular to the plane
  • in temp. approx. 20°C

What influences lifting capacity in practice

It is worth knowing that the magnet holding will differ depending on the following factors, in order of importance:
  • Air gap (betwixt the magnet and the plate), as even a very small clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Plate thickness – insufficiently thick plate does not close the flux, causing part of the power to be wasted to the other side.
  • Metal type – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
  • Thermal factor – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

H&S for magnets
Compass and GPS

A powerful magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets near a smartphone to avoid damaging the sensors.

Swallowing risk

Adult use only. Tiny parts pose a choking risk, leading to serious injuries. Keep out of reach of children and animals.

Metal Allergy

It is widely known that nickel (the usual finish) is a strong allergen. For allergy sufferers, avoid direct skin contact and choose coated magnets.

Bone fractures

Protect your hands. Two powerful magnets will snap together immediately with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Thermal limits

Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Data carriers

Intense magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Dust explosion hazard

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Shattering risk

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.

Do not underestimate power

Use magnets with awareness. Their immense force can shock even professionals. Stay alert and respect their force.

Pacemakers

For implant holders: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or request help to handle the magnets.

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