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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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Technical details - 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

Engineering simulation of the assembly - report

Presented data constitute the outcome of a physical calculation. Results rely on algorithms for the class Nd2Fe14B. Actual performance might slightly differ. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static force (pull vs distance) - power drop
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 lbs
940.0 g / 9.2 N
weak grip
1 mm 5318 Gs
531.8 mT
0.79 kg / 1.74 lbs
788.4 g / 7.7 N
weak grip
2 mm 4833 Gs
483.3 mT
0.65 kg / 1.44 lbs
651.1 g / 6.4 N
weak grip
3 mm 4366 Gs
436.6 mT
0.53 kg / 1.17 lbs
531.5 g / 5.2 N
weak grip
5 mm 3517 Gs
351.7 mT
0.34 kg / 0.76 lbs
344.9 g / 3.4 N
weak grip
10 mm 1995 Gs
199.5 mT
0.11 kg / 0.24 lbs
111.0 g / 1.1 N
weak grip
15 mm 1168 Gs
116.8 mT
0.04 kg / 0.08 lbs
38.0 g / 0.4 N
weak grip
20 mm 727 Gs
72.7 mT
0.01 kg / 0.03 lbs
14.7 g / 0.1 N
weak grip
30 mm 332 Gs
33.2 mT
0.00 kg / 0.01 lbs
3.1 g / 0.0 N
weak grip
50 mm 106 Gs
10.6 mT
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
weak grip

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.19 kg / 0.41 lbs
188.0 g / 1.8 N
1 mm Stal (~0.2) 0.16 kg / 0.35 lbs
158.0 g / 1.5 N
2 mm Stal (~0.2) 0.13 kg / 0.29 lbs
130.0 g / 1.3 N
3 mm Stal (~0.2) 0.11 kg / 0.23 lbs
106.0 g / 1.0 N
5 mm Stal (~0.2) 0.07 kg / 0.15 lbs
68.0 g / 0.7 N
10 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
15 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N

Table 3: Wall mounting (sliding) - 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 lbs
282.0 g / 2.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.19 kg / 0.41 lbs
188.0 g / 1.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.09 kg / 0.21 lbs
94.0 g / 0.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.47 kg / 1.04 lbs
470.0 g / 4.6 N

Table 4: Material efficiency (substrate influence) - 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 lbs
94.0 g / 0.9 N
1 mm
25%
0.24 kg / 0.52 lbs
235.0 g / 2.3 N
2 mm
50%
0.47 kg / 1.04 lbs
470.0 g / 4.6 N
3 mm
75%
0.71 kg / 1.55 lbs
705.0 g / 6.9 N
5 mm
100%
0.94 kg / 2.07 lbs
940.0 g / 9.2 N
10 mm
100%
0.94 kg / 2.07 lbs
940.0 g / 9.2 N
11 mm
100%
0.94 kg / 2.07 lbs
940.0 g / 9.2 N
12 mm
100%
0.94 kg / 2.07 lbs
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 lbs
940.0 g / 9.2 N
OK
40 °C -2.2% 0.92 kg / 2.03 lbs
919.3 g / 9.0 N
OK
60 °C -4.4% 0.90 kg / 1.98 lbs
898.6 g / 8.8 N
OK
80 °C -6.6% 0.88 kg / 1.94 lbs
878.0 g / 8.6 N
100 °C -28.8% 0.67 kg / 1.48 lbs
669.3 g / 6.6 N

Table 6: Two magnets (repulsion) - forces in the system
MP 24x16x2 / N38

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

Table 7: Safety (HSE) (implants) - 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
Mobile device 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: Dynamics (kinetic energy) - collision effects
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: Electrical data (Flux)
MP 24x16x2 / N38

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

Table 11: Underwater work (magnet fishing)
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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

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

2. Steel saturation

*Thin steel (e.g. computer case) significantly reduces the holding force.

3. Heat tolerance

*For N38 grade, 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.

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%
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)

Magnetic Field

Other deals

It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Thanks to the hole (often for a screw), this model enables quick installation to wood, wall, plastic, or metal. This product with a force of 0.94 kg works great as a door latch, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 24x16x2 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle 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.
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. 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. 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.
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 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. 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 and cons of rare earth magnets.

Benefits

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • Neodymium magnets prove to be highly resistant to loss of magnetic properties caused by external magnetic fields,
  • By covering with a lustrous layer of gold, the element has an elegant look,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in designing and the capacity to customize to specific needs,
  • Versatile presence in innovative solutions – they are utilized in hard drives, electromotive mechanisms, precision medical tools, and multitasking production systems.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets suffer 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 start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We recommend casing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets can be problematic in diagnostics medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat it depends on?

The lifting capacity listed is a theoretical maximum value executed under the following configuration:
  • on a base made of mild steel, optimally conducting the magnetic field
  • with a cross-section of at least 10 mm
  • with an ground contact surface
  • with direct contact (without paint)
  • during pulling in a direction vertical to the plane
  • at ambient temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Please note that the magnet holding may be lower depending on the following factors, in order of importance:
  • Clearance – the presence of any layer (rust, tape, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
  • Load vector – highest force is obtained only during perpendicular pulling. The shear force of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin sheet does not accept the full field, causing part of the power to be escaped to the other side.
  • Steel grade – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
  • Plate texture – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Safe handling of neodymium magnets
Fire warning

Drilling and cutting of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Finger safety

Risk of injury: The pulling power is so immense that it can result in blood blisters, crushing, and broken bones. Protective gloves are recommended.

Safe operation

Handle with care. Neodymium magnets attract from a long distance and snap with huge force, often quicker than you can react.

Allergy Warning

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If redness appears, cease working with magnets and use protective gear.

Medical implants

Warning for patients: Strong magnetic fields disrupt electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Keep away from children

Only for adults. Small elements pose a choking risk, leading to serious injuries. Store away from children and animals.

Material brittleness

Beware of splinters. Magnets can explode upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Keep away from computers

Do not bring magnets near a wallet, computer, or screen. The magnetism can permanently damage these devices and erase data from cards.

Maximum temperature

Keep cool. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

Threat to navigation

A strong magnetic field negatively affects the operation of magnetometers in phones and GPS navigation. Maintain magnets near a device to avoid breaking the sensors.

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