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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

47.99 with VAT / pcs + price for transport

39.02 ZŁ net + 23% VAT / pcs

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Technical of the product - 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

Physical modeling of the assembly - report

Presented values are the outcome of a engineering calculation. Values were calculated on algorithms for the class Nd2Fe14B. Actual parameters may deviate from the simulation results. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static pull 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

Table 2: Sliding hold (vertical surface)
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

Table 3: Vertical assembly (shearing) - 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

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 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

Table 5: Working in heat (stability) - resistance threshold
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

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

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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

Table 7: Safety (HSE) (electronics) - 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
Mechanical watch 20 Gs (2.0 mT) 19.5 cm
Phone / Smartphone 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

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

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)

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)

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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Caution: On a vertical surface, the magnet holds merely approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. computer case) severely weakens 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

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.

Technical and environmental data
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: 030204-2026
Magnet Unit Converter
Force (pull)

Field Strength

Other deals

The ring magnet with a hole MP 60x20x5 / N38 is created for permanent mounting, 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 is a crucial issue when working with model MP 60x20x5 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a flexible washer 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 can be damaged when tightening the screw, which will become a corrosion focus. This product is dedicated for inside building 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.
The presented product is a ring magnet with dimensions Ø60 mm (outer diameter) and height 5 mm. The key parameter here is the holding force amounting to approximately 9.41 kg (force ~92.27 N). 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. In the case of connecting two rings, make sure one is turned the right way. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Apart from their strong power, neodymium magnets have these key benefits:
  • They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
  • They have excellent resistance to magnetic field loss when exposed to external fields,
  • A magnet with a shiny nickel surface has an effective appearance,
  • Neodymium magnets achieve maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
  • In view of the potential of flexible molding and adaptation to specialized projects, magnetic components can be produced in a variety of forms and dimensions, which amplifies use scope,
  • Wide application in future technologies – they are used in magnetic memories, electric drive systems, medical equipment, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in miniature devices

Weaknesses

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • Neodymium magnets decrease their strength 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 stability even at temperatures up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in producing nuts and complex shapes in magnets, we recommend using casing - magnetic mount.
  • Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these devices can complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price exceeds standard values,

Pull force analysis

Maximum lifting capacity of the magnetwhat affects it?

Holding force of 9.41 kg is a result of laboratory testing conducted under standard conditions:
  • using a base made of high-permeability steel, serving as a ideal flux conductor
  • whose transverse dimension equals approx. 10 mm
  • with a surface free of scratches
  • under conditions of gap-free contact (surface-to-surface)
  • under perpendicular force direction (90-degree angle)
  • at temperature room level

Lifting capacity in real conditions – factors

Bear in mind that the application force will differ subject to elements below, starting with the most relevant:
  • Distance (between the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
  • Plate texture – ground elements ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet and the plate lowers the lifting capacity.

Warnings
Do not drill into magnets

Fire warning: Neodymium dust is explosive. Avoid machining magnets in home conditions as this may cause fire.

Precision electronics

A powerful magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Keep magnets near a device to prevent breaking the sensors.

Magnet fragility

NdFeB magnets are ceramic materials, meaning they are fragile like glass. Clashing of two magnets leads to them shattering into small pieces.

Avoid contact if allergic

Studies show that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, avoid direct skin contact or opt for versions in plastic housing.

Finger safety

Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Permanent damage

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Cards and drives

Intense magnetic fields can erase data on payment cards, HDDs, and storage devices. Maintain a gap of min. 10 cm.

Product not for children

These products are not suitable for play. Eating a few magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and requires immediate surgery.

Safe operation

Use magnets consciously. Their powerful strength can surprise even experienced users. Plan your moves and do not underestimate their force.

Pacemakers

People with a pacemaker have to maintain an absolute distance from magnets. The magnetic field can interfere with the operation of the life-saving device.

Attention! Want to know more? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98