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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

check parameters »

3.69 ZŁ with VAT / pcs + price for transport

3.00 ZŁ net + 23% VAT / pcs

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Parameters as well as form of a neodymium magnet can be reviewed on our magnetic mass calculator.

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Product card - 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 assembly - technical parameters

The following data represent the result of a engineering calculation. Results rely on models for the class Nd2Fe14B. Operational conditions may differ from theoretical values. Treat these calculations as a reference point during assembly planning.

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 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
Magnetic force drops drastically with every subsequent millimeter of spacing. Keep in mind that even the smallest gap (e.g., dirt, paint, veneer) significantly reduces the pull force. Neodymiums work strongest at the point of direct contact; gap weakens the power. Notice how rapidly the pull force drop, when the magnet does not adhere tightly to the metal substrate. When planning the mounting, eliminate additional spacers.

Table 2: Shear hold (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
This section shows the approximate force sufficient to start the shifting of the magnet downwards against a upright steel plate (considering standard friction coefficient). This value is a function of the separation distance between the magnet and the metal.

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
When placing a element on a upright surface (e.g., a board), it will maintain only about 1/5 of its maximum pull force. Gravity as well as a low friction coefficient cause that magnets move down faster than they pull off. Want to create a hanger? Note that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a much lighter cargo. Using a rubber pad can significantly increase the grip.

Table 4: Material efficiency (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 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
A thin sheet cannot conduct the full magnetic flux, which squanders power of the holder. Should you mount a strong magnet to a too thin substrate, the magnetism will penetrate right through and the pull force will drop sharply. To squeeze the maximum of this magnet's potential, you need a suitably thick element of metal. The material oversaturation means that on sheet metal structures (e.g., car bodies), the magnet shows lower pull force. We recommend selecting the steel dimension according to the table below.

Table 5: Working in heat (material behavior) - 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
Ordinary NdFeB products lose power past the thermal threshold. Protect against heat – excessive heat can permanently destroy this magnet. As the temperature rises, the neodymium's force momentarily decreases. Do not use this product in hot environments exceeding its operating temperature limit. Ignoring the limit will lead to permanent loss of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) may lose charge permanently at lower temperatures than long magnets. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
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 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
Two magnets attract each other from a significantly greater distance than a magnet and steel combination. The setup of magnet-to-magnet creates a more powerful interaction and a wider radius of performance. Planning to create a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is extreme. The repulsion force is slightly lower than the attraction, but still significant.
*Field value for N-N configuration reaches ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Note: Figures refer to friction force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

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
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
Powerful magnet radiation poses a serious hazard to IT equipment and medical implants. These neodymiums generate a flux that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and housings. Increased vigilance must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - 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
Magnetic elements are delicate – a strong collision with metal can result in shattering. Watch the impact speed – a magnet released freely speeds with massive force. Striking energy can destroy the magnet or painful pinches to fingers. Always hold the magnet during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Use safety goggles when handling with large magnets.

Table 9: Corrosion resistance
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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

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)
Total magnetic flux emitted by the pole surface. Essential parameter in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
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.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

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

2. Steel saturation

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

3. Thermal stability

*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) = 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
Elemental analysis
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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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 easy screwing to wood, wall, plastic, or metal. This product with a force of 0.94 kg works great as a cabinet closure, speaker holder, or spacer 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. 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 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. Aesthetic mounting requires selecting the appropriate head size.
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 mounting hole diameter is precisely 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages and disadvantages of rare earth magnets.

Pros

Apart from their superior holding force, neodymium magnets have these key benefits:
  • They have unchanged lifting capacity, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
  • Magnets effectively protect themselves against loss of magnetization caused by ambient magnetic noise,
  • By using a shiny coating of silver, the element has an elegant look,
  • Magnets possess excellent magnetic induction on the surface,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of custom forming and adapting to individual requirements,
  • Fundamental importance in high-tech industry – they are used in magnetic memories, brushless drives, diagnostic systems, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in miniature devices

Cons

Characteristics of disadvantages of neodymium magnets: application proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening 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 very resistant to heat
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic mount, due to difficulties in producing threads inside the magnet and complex shapes.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Highest magnetic holding force – what affects it?

Holding force of 0.94 kg is a theoretical maximum value performed under the following configuration:
  • on a plate made of mild steel, perfectly concentrating the magnetic flux
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with a plane perfectly flat
  • under conditions of gap-free contact (metal-to-metal)
  • under vertical force vector (90-degree angle)
  • at temperature room level

Lifting capacity in practice – influencing factors

Bear in mind that the magnet holding will differ subject to the following factors, in order of importance:
  • Distance – the presence of any layer (rust, dirt, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Thermal factor – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under shearing force the holding force is lower. Additionally, even a small distance between the magnet and the plate lowers the load capacity.

Warnings
Fire warning

Drilling and cutting of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Fragile material

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Avoid contact if allergic

Certain individuals have a sensitization to nickel, which is the common plating for NdFeB magnets. Extended handling may cause an allergic reaction. We strongly advise use protective gloves.

Caution required

Be careful. Rare earth magnets attract from a distance and snap with huge force, often faster than you can move away.

Permanent damage

Standard neodymium magnets (N-type) lose power when the temperature exceeds 80°C. This process is irreversible.

Danger to the youngest

Strictly store magnets away from children. Ingestion danger is high, and the consequences of magnets clamping inside the body are tragic.

Magnetic interference

Be aware: neodymium magnets produce a field that disrupts precision electronics. Maintain a separation from your phone, device, and navigation systems.

Threat to electronics

Device Safety: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Pinching danger

Mind your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Life threat

Life threat: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Warning! Details about hazards in the article: Safety of working with magnets.