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MP 24x16x2 / N38 - ring magnet

ring magnet

Catalog no 030495

GTIN/EAN: 5906301812364

5.00

Diameter

24 mm [±0,1 mm]

internal diameter Ø

16 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

3.77 g

Magnetization Direction

↑ axial

Load capacity

0.94 kg / 9.22 N

Magnetic Induction

101.91 mT / 1019 Gs

Coating

[NiCuNi] Nickel

3.69 with VAT / pcs + price for transport

3.00 ZŁ net + 23% VAT / pcs

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Physical properties - MP 24x16x2 / N38 - ring magnet

Specification / characteristics - MP 24x16x2 / N38 - ring magnet

properties
properties values
Cat. no. 030495
GTIN/EAN 5906301812364
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 24 mm [±0,1 mm]
internal diameter Ø 16 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 3.77 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.94 kg / 9.22 N
Magnetic Induction ~ ? 101.91 mT / 1019 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 24x16x2 / 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 simulation of the assembly - report

The following values represent the direct effect of a engineering calculation. Values are based on algorithms for the material Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Use these calculations as a reference point for designers.

Table 1: Static pull force (pull vs gap) - characteristics
MP 24x16x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5807 Gs
580.7 mT
0.94 kg / 2.07 pounds
940.0 g / 9.2 N
low risk
1 mm 5318 Gs
531.8 mT
0.79 kg / 1.74 pounds
788.4 g / 7.7 N
low risk
2 mm 4833 Gs
483.3 mT
0.65 kg / 1.44 pounds
651.1 g / 6.4 N
low risk
3 mm 4366 Gs
436.6 mT
0.53 kg / 1.17 pounds
531.5 g / 5.2 N
low risk
5 mm 3517 Gs
351.7 mT
0.34 kg / 0.76 pounds
344.9 g / 3.4 N
low risk
10 mm 1995 Gs
199.5 mT
0.11 kg / 0.24 pounds
111.0 g / 1.1 N
low risk
15 mm 1168 Gs
116.8 mT
0.04 kg / 0.08 pounds
38.0 g / 0.4 N
low risk
20 mm 727 Gs
72.7 mT
0.01 kg / 0.03 pounds
14.7 g / 0.1 N
low risk
30 mm 332 Gs
33.2 mT
0.00 kg / 0.01 pounds
3.1 g / 0.0 N
low risk
50 mm 106 Gs
10.6 mT
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
low risk

Table 2: Slippage force (vertical surface)
MP 24x16x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.19 kg / 0.41 pounds
188.0 g / 1.8 N
1 mm Stal (~0.2) 0.16 kg / 0.35 pounds
158.0 g / 1.5 N
2 mm Stal (~0.2) 0.13 kg / 0.29 pounds
130.0 g / 1.3 N
3 mm Stal (~0.2) 0.11 kg / 0.23 pounds
106.0 g / 1.0 N
5 mm Stal (~0.2) 0.07 kg / 0.15 pounds
68.0 g / 0.7 N
10 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
15 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 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

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 24x16x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.28 kg / 0.62 pounds
282.0 g / 2.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.19 kg / 0.41 pounds
188.0 g / 1.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.09 kg / 0.21 pounds
94.0 g / 0.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.47 kg / 1.04 pounds
470.0 g / 4.6 N

Table 4: Material efficiency (saturation) - power losses
MP 24x16x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.09 kg / 0.21 pounds
94.0 g / 0.9 N
1 mm
25%
0.24 kg / 0.52 pounds
235.0 g / 2.3 N
2 mm
50%
0.47 kg / 1.04 pounds
470.0 g / 4.6 N
3 mm
75%
0.71 kg / 1.55 pounds
705.0 g / 6.9 N
5 mm
100%
0.94 kg / 2.07 pounds
940.0 g / 9.2 N
10 mm
100%
0.94 kg / 2.07 pounds
940.0 g / 9.2 N
11 mm
100%
0.94 kg / 2.07 pounds
940.0 g / 9.2 N
12 mm
100%
0.94 kg / 2.07 pounds
940.0 g / 9.2 N

Table 5: Thermal resistance (stability) - resistance threshold
MP 24x16x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.94 kg / 2.07 pounds
940.0 g / 9.2 N
OK
40 °C -2.2% 0.92 kg / 2.03 pounds
919.3 g / 9.0 N
OK
60 °C -4.4% 0.90 kg / 1.98 pounds
898.6 g / 8.8 N
OK
80 °C -6.6% 0.88 kg / 1.94 pounds
878.0 g / 8.6 N
100 °C -28.8% 0.67 kg / 1.48 pounds
669.3 g / 6.6 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 24x16x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 79.38 kg / 175.01 pounds
6 091 Gs
11.91 kg / 26.25 pounds
11908 g / 116.8 N
N/A
1 mm 72.89 kg / 160.70 pounds
11 129 Gs
10.93 kg / 24.11 pounds
10934 g / 107.3 N
65.60 kg / 144.63 pounds
~0 Gs
2 mm 66.58 kg / 146.78 pounds
10 636 Gs
9.99 kg / 22.02 pounds
9987 g / 98.0 N
59.92 kg / 132.10 pounds
~0 Gs
3 mm 60.60 kg / 133.60 pounds
10 147 Gs
9.09 kg / 20.04 pounds
9090 g / 89.2 N
54.54 kg / 120.24 pounds
~0 Gs
5 mm 49.75 kg / 109.67 pounds
9 194 Gs
7.46 kg / 16.45 pounds
7462 g / 73.2 N
44.77 kg / 98.70 pounds
~0 Gs
10 mm 29.13 kg / 64.21 pounds
7 035 Gs
4.37 kg / 9.63 pounds
4369 g / 42.9 N
26.21 kg / 57.79 pounds
~0 Gs
20 mm 9.37 kg / 20.67 pounds
3 991 Gs
1.41 kg / 3.10 pounds
1406 g / 13.8 N
8.44 kg / 18.60 pounds
~0 Gs
50 mm 0.54 kg / 1.19 pounds
958 Gs
0.08 kg / 0.18 pounds
81 g / 0.8 N
0.49 kg / 1.07 pounds
~0 Gs
60 mm 0.26 kg / 0.57 pounds
663 Gs
0.04 kg / 0.09 pounds
39 g / 0.4 N
0.23 kg / 0.51 pounds
~0 Gs
70 mm 0.13 kg / 0.30 pounds
478 Gs
0.02 kg / 0.04 pounds
20 g / 0.2 N
0.12 kg / 0.27 pounds
~0 Gs
80 mm 0.07 kg / 0.16 pounds
356 Gs
0.01 kg / 0.02 pounds
11 g / 0.1 N
0.07 kg / 0.15 pounds
~0 Gs
90 mm 0.04 kg / 0.10 pounds
272 Gs
0.01 kg / 0.01 pounds
7 g / 0.1 N
0.04 kg / 0.09 pounds
~0 Gs
100 mm 0.03 kg / 0.06 pounds
213 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
0.02 kg / 0.05 pounds
~0 Gs

Table 7: Hazards (electronics) - warnings
MP 24x16x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 16.5 cm
Hearing aid 10 Gs (1.0 mT) 13.0 cm
Mechanical watch 20 Gs (2.0 mT) 10.0 cm
Mobile device 40 Gs (4.0 mT) 7.5 cm
Car key 50 Gs (5.0 mT) 7.0 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm

Table 8: Collisions (cracking risk) - warning
MP 24x16x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.06 km/h
(4.74 m/s)
0.04 J
30 mm 27.64 km/h
(7.68 m/s)
0.11 J
50 mm 35.62 km/h
(9.89 m/s)
0.18 J
100 mm 50.36 km/h
(13.99 m/s)
0.37 J

Table 9: Anti-corrosion coating durability
MP 24x16x2 / 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: Construction data (Pc)
MP 24x16x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 23 520 Mx 235.2 µWb
Pc Coefficient 1.04 High (Stable)

Table 11: Physics of underwater searching
MP 24x16x2 / N38

Environment Effective steel pull Effect
Air (land) 0.94 kg Standard
Water (riverbed) 1.08 kg
(+0.14 kg buoyancy gain)
+14.5%
Corrosion 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 limits the holding force.

3. Thermal stability

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.04

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 specification and ecology
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%
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: 030495-2026
Magnet Unit Converter
Pulling force

Magnetic Induction

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The ring magnet with a hole MP 24x16x2 / 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. 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. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. 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 (24 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø24x2 mm and a weight of 3.77 g. The key parameter here is the lifting capacity amounting to approximately 0.94 kg (force ~9.22 N). The mounting hole diameter is precisely 16 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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages as well as disadvantages of rare earth magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They have excellent resistance to magnetic field loss due to external fields,
  • By applying a smooth layer of nickel, the element acquires an nice look,
  • The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
  • Thanks to modularity in designing and the ability to modify to specific needs,
  • Versatile presence in advanced technology sectors – they serve a role in mass storage devices, brushless drives, diagnostic systems, also industrial machines.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages

Cons of neodymium magnets and proposals for their use:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • We recommend cover - magnetic holder, due to difficulties in producing threads inside the magnet and complicated forms.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
  • Due to complex production process, their price is relatively high,

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

Breakaway force was determined for optimal configuration, assuming:
  • using a plate made of mild steel, acting as a circuit closing element
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • characterized by even structure
  • under conditions of ideal adhesion (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • in neutral thermal conditions

Impact of factors on magnetic holding capacity in practice

During everyday use, the actual lifting capacity is determined by a number of factors, ranked from crucial:
  • Gap (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Plate thickness – too thin sheet does not close the flux, causing part of the flux to be escaped to the other side.
  • Steel grade – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Plate texture – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas 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 and the plate reduces the holding force.

Warnings
Conscious usage

Use magnets consciously. Their immense force can shock even experienced users. Stay alert and respect their force.

Do not overheat magnets

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Keep away from children

Always keep magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are fatal.

Machining danger

Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Safe distance

Do not bring magnets near a wallet, laptop, or TV. The magnetism can destroy these devices and erase data from cards.

Allergic reactions

Certain individuals experience a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Extended handling may cause a rash. It is best to wear protective gloves.

Bone fractures

Danger of trauma: The attraction force is so great that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Magnet fragility

Protect your eyes. Magnets can fracture upon violent connection, ejecting shards into the air. We recommend safety glasses.

Medical interference

Patients with a pacemaker should maintain an large gap from magnets. The magnetic field can disrupt the functioning of the implant.

Keep away from electronics

Remember: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a separation from your mobile, tablet, and navigation systems.

Danger! Looking for details? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98