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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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Parameters along with form of magnetic components can be estimated with our force calculator.

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Technical of the product - 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

Technical simulation of the assembly - report

Presented data constitute the direct effect of a engineering analysis. Values were calculated on models for the material Nd2Fe14B. Operational conditions may differ. Please consider these data as a supplementary guide when designing systems.

Table 1: Static force (force vs distance) - 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: Shear capacity (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 (shearing) - vertical pull
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: Steel thickness (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: Working in heat (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) Lateral 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) - precautionary measures
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
Phone / Smartphone 40 Gs (4.0 mT) 7.5 cm
Remote 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: Impact energy (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: Coating parameters (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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Shear force

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

2. Efficiency vs thickness

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

3. Thermal stability

*For standard magnets, the critical 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 and environmental data
Material specification
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
Measurement Calculator
Force (pull)

Field Strength

Other offers

The ring-shaped magnet MP 24x16x2 / N38 is created for permanent mounting, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 0.94 kg works great as a door latch, speaker holder, or mounting element in devices.
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 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 is not sufficient for rain. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for indoor 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. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. 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.
It is a magnetic ring with a diameter of 24 mm and thickness 2 mm. The pulling force of this model is an impressive 0.94 kg, which translates to 9.22 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 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. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths as well as weaknesses of rare earth magnets.

Benefits

Apart from their strong power, neodymium magnets have these key benefits:
  • They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
  • Neodymium magnets remain extremely resistant to loss of magnetic properties caused by external interference,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnetic induction on the working layer of the magnet remains very high,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to freedom in designing and the ability to adapt to specific needs,
  • Wide application in future technologies – they find application in computer drives, electric motors, medical equipment, and complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in strength. 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
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • We recommend casing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Highest magnetic holding forcewhat affects it?

Holding force of 0.94 kg is a theoretical maximum value executed under specific, ideal conditions:
  • with the application of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • with a thickness of at least 10 mm
  • characterized by even structure
  • without any air gap between the magnet and steel
  • under vertical force direction (90-degree angle)
  • at room temperature

Practical lifting capacity: influencing factors

During everyday use, the actual lifting capacity depends on a number of factors, listed from most significant:
  • Distance – existence of any layer (paint, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Base massiveness – insufficiently thick steel does not close the flux, causing part of the flux to be lost to the other side.
  • Chemical composition of the base – mild steel attracts best. Alloy admixtures decrease magnetic permeability and lifting capacity.
  • Base smoothness – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was determined by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet and the plate decreases the holding force.

Warnings
Danger to the youngest

Absolutely keep magnets away from children. Choking hazard is high, and the consequences of magnets connecting inside the body are tragic.

Flammability

Dust created during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Handling rules

Use magnets consciously. Their immense force can shock even experienced users. Be vigilant and do not underestimate their power.

GPS and phone interference

Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Warning for heart patients

Individuals with a pacemaker must keep an absolute distance from magnets. The magnetism can stop the functioning of the life-saving device.

Magnetic media

Intense magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Finger safety

Big blocks can smash fingers instantly. Never put your hand betwixt two attracting surfaces.

Permanent damage

Avoid heat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, ask us about HT versions (H, SH, UH).

Avoid contact if allergic

A percentage of the population suffer from a sensitization to nickel, which is the standard coating for neodymium magnets. Prolonged contact might lead to skin redness. We suggest use safety gloves.

Fragile material

Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Security! Learn more about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98