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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

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3.69 ZŁ with VAT / pcs + price for transport

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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

Technical analysis of the product - technical parameters

These values are the outcome of a engineering analysis. Results are based on algorithms for the material Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Use these calculations as a reference point for designers.

Table 1: Static force (force vs gap) - 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 pounds
940.0 g / 9.2 N
 weak grip
1 mm 5318 Gs
531.8 mT
 0.79 kg / 1.74 pounds
788.4 g / 7.7 N
 weak grip
2 mm 4833 Gs
483.3 mT
 0.65 kg / 1.44 pounds
651.1 g / 6.4 N
 weak grip
3 mm 4366 Gs
436.6 mT
 0.53 kg / 1.17 pounds
531.5 g / 5.2 N
 weak grip
5 mm 3517 Gs
351.7 mT
 0.34 kg / 0.76 pounds
344.9 g / 3.4 N
 weak grip
10 mm 1995 Gs
199.5 mT
 0.11 kg / 0.24 pounds
111.0 g / 1.1 N
 weak grip
15 mm 1168 Gs
116.8 mT
 0.04 kg / 0.08 pounds
38.0 g / 0.4 N
 weak grip
20 mm 727 Gs
72.7 mT
 0.01 kg / 0.03 pounds
14.7 g / 0.1 N
 weak grip
30 mm 332 Gs
33.2 mT
 0.00 kg / 0.01 pounds
3.1 g / 0.0 N
 weak grip
50 mm 106 Gs
10.6 mT
 0.00 kg / 0.00 pounds
0.3 g / 0.0 N
 weak grip
Pulling power weakens significantly per each millimeter of spacing. Note that even the smallest gap (e.g., dirt, varnish, rust) strongly reduces the pull force. Magnets hold most effectively at the point of direct contact; air break nullifies the power. Notice how flashily the pull force fall, when the product does not adhere flatly to the metal substrate. When calculating the mounting, discard unnecessary gaps.

Table 2: Sliding hold (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
The table below presents the estimated holding capacity necessary to cause the slippage of the magnet downwards against a upright metal surface (considering typical friction). The holding force is relative to the separation distance between the magnet and the surface.

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
When mounting a element on a vertical plane (e.g., a fridge), it will only hold just about 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip mean that products slide down faster than they pull off. Want to create a wall mount? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a noticeably lighter cargo. Application of an anti-slip layer can effectively increase the grip.

Table 4: Steel thickness (substrate influence) - sheet metal selection
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
A thin sheet is unable to focus the entire magnetic field, which squanders power of the holder. If you install a neodymium to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To achieve the maximum of this neodymium's potential, you need a suitably thick piece of metal. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the product holds weaker. We suggest choosing the steel thickness from these parameters.

Table 5: Working in heat (material behavior) - power drop
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
Ordinary NdFeB products irreversibly lose strength above the temperature limit. Protect against heat – high temperature can permanently demagnetize this magnet. With every degree above norm, the neodymium's power briefly drops. Refrain from using this magnet in hot environments higher than its operating temperature limit. Exceeding the critical threshold will lead to permanent loss of magnetism.
*Technical advisory: Temperature resistance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) may lose charge permanently at lower temperatures than taller cylinders. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - 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
Two strong neodymiums interact from a much further distance than a magnet and sheet combination. Such a system of two magnets creates a more powerful interaction and a further horizon of operation. Designing a strong closure? Use a pair of magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the collision energy is huge. The repulsion force is marginally weaker than the connection force, but still significant.
*The magnetic induction between like poles reaches ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Note: Calculations refer to shear force of dual same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (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
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
A strong magnetic field is a serious hazard to electronics as well as medical implants. These NdFeB products generate a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field acts through matter and glass. Increased vigilance must be taken by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

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
Magnetic elements are prone to chipping – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely speeds with massive force. Kinetic force can destroy the magnet or dangerous crushing to skin. Hold the magnet firmly during mounting so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the neodymium. Wear safety glasses when playing with powerful specimens.

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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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)
Flux value emitted by the pole surface. Key data when building generators as well as sensors. The Pc coefficient defines the working geometry.

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.
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Caution: On a vertical wall, the magnet retains only a fraction of its max power.

2. Efficiency vs thickness

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

3. Thermal stability

*For N38 material, 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

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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
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
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The ring magnet with a hole MP 24x16x2 / 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. 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. The flat screw head should evenly press the magnet. 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 does not ensure full waterproofing. 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. 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 holding force 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 neodymium magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:
  • They have constant strength, and over around 10 years their attraction force decreases symbolically – ~1% (in testing),
  • They are noted for resistance to demagnetization induced by external field influence,
  • In other words, due to the reflective surface of silver, the element gains a professional look,
  • Neodymium magnets create maximum magnetic induction on a contact point, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to modularity in designing and the capacity to adapt to client solutions,
  • Wide application in modern technologies – they serve a role in mass storage devices, motor assemblies, medical devices, also complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as 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
  • 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 secure oxidation and corrosion.
  • We suggest a housing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which becomes key in the context of child safety. Additionally, small elements of these devices can complicate diagnosis medical in case of swallowing.
  • 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

Detachment force of the magnet in optimal conditions – what contributes to it?

The declared magnet strength represents the maximum value, recorded under laboratory conditions, specifically:
  • using a sheet made of high-permeability steel, functioning as a ideal flux conductor
  • with a thickness of at least 10 mm
  • with a surface cleaned and smooth
  • under conditions of ideal adhesion (metal-to-metal)
  • during detachment in a direction perpendicular to the plane
  • in stable room temperature

Lifting capacity in practice – influencing factors

Please note that the working load will differ subject to elements below, starting with the most relevant:
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Load vector – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. High carbon content worsen the attraction effect.
  • Surface condition – ground elements guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet and the plate reduces the holding force.

Warnings
Shattering risk

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

Keep away from children

Absolutely keep magnets out of reach of children. Choking hazard is significant, and the consequences of magnets clamping inside the body are tragic.

Health Danger

Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Phone sensors

Note: rare earth magnets produce a field that interferes with sensitive sensors. Maintain a separation from your phone, device, and GPS.

Thermal limits

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

Magnetic media

Do not bring magnets near a wallet, laptop, or TV. The magnetic field can destroy these devices and wipe information from cards.

Safe operation

Handle magnets with awareness. Their huge power can shock even professionals. Be vigilant and do not underestimate their power.

Hand protection

Danger of trauma: The pulling power is so great that it can result in hematomas, pinching, and broken bones. Use thick gloves.

Sensitization to coating

Studies show that the nickel plating (standard magnet coating) is a strong allergen. If you have an allergy, prevent direct skin contact or select versions in plastic housing.

Dust explosion hazard

Mechanical processing of NdFeB material poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Important! Want to know more? Check our post: Why are neodymium magnets dangerous?