Strong neodymium magnets: discs and cylinders

Looking for massive power in small size? We offer rich assortment of various shapes and sizes. Best choice for domestic applications, garage and model making. Browse assortment with fast shipping.

see magnet catalog

Equipment for treasure hunters

Start your adventure related to seabed exploration! Our specialized grips (F200, F400) provide safety guarantee and immense power. Solid, corrosion-resistant housing and strong lines will perform in any water.

find searching equipment

Industrial magnetic grips mounting

Proven solutions for mounting without drilling. Threaded mounts (external or internal) provide quick improvement of work on production halls. They are indispensable mounting lamps, detectors and banners.

see industrial applications

🚚 Order by 14:00 – we'll ship same day!

Dhit sp. z o.o.
Product available Ships tomorrow

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

bulk discounts:

Need more?

price from 1 pcs
3.00 ZŁ
3.69 ZŁ
price from 200 pcs
2.82 ZŁ
3.47 ZŁ
price from 850 pcs
2.64 ZŁ
3.25 ZŁ
Not sure about your choice?

Call us now +48 888 99 98 98 alternatively get in touch using inquiry form the contact form page.
Force along with shape of a neodymium magnet can be reviewed using our modular calculator.

Orders placed before 14:00 will be shipped the same business day.

Detailed specification - 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 magnet - technical parameters

Presented values represent the result of a mathematical calculation. Results rely on models for the material Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Use these data as a supplementary guide for designers.

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

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 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: Vertical assembly (shearing) - 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 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: Steel thickness (saturation) - 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

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

Table 6: Magnet-Magnet interaction (repulsion) - field range
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: Protective zones (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
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 (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: 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: 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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

*Note: On a vertical surface, the magnet retains only ~20% of its max power.

2. Steel thickness impact

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

3. Power loss vs temp

*For N38 material, the max working temp 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.

Technical and environmental data
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%
Ecology and recycling (GPSR)
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
Quick Unit Converter
Force (pull)

Magnetic Induction

Other proposals

It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Mounting is clean and reversible, unlike gluing. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This is a crucial issue when working with model MP 24x16x2 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable 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.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. 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.
The presented product is a ring magnet with dimensions Ø24 mm (outer diameter) and height 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.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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.

Strengths and weaknesses of Nd2Fe14B magnets.

Benefits

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They retain attractive force for nearly 10 years – the drop is just ~1% (in theory),
  • Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
  • A magnet with a metallic gold surface looks better,
  • Neodymium magnets deliver maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
  • In view of the ability of free forming and customization to unique solutions, NdFeB magnets can be created in a variety of geometric configurations, which amplifies use scope,
  • Versatile presence in high-tech industry – they serve a role in data components, brushless drives, advanced medical instruments, and industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited ability of making threads in the magnet and complex forms - recommended is casing - magnet mounting.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these products can complicate diagnosis medical after entering the body.
  • With mass production the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum holding power of the magnet – what affects it?

Information about lifting capacity was determined for optimal configuration, including:
  • using a sheet made of low-carbon steel, functioning as a circuit closing element
  • possessing a massiveness of at least 10 mm to avoid saturation
  • characterized by even structure
  • with direct contact (without impurities)
  • during pulling in a direction perpendicular to the plane
  • at standard ambient temperature

Lifting capacity in practice – influencing factors

Bear in mind that the magnet holding will differ influenced by the following factors, in order of importance:
  • Distance (betwixt the magnet and the plate), because even a very small clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, rust or dirt).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Base massiveness – insufficiently thick steel causes magnetic saturation, causing part of the power to be lost into the air.
  • Material type – ideal substrate is high-permeability steel. Stainless steels may attract less.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets
Crushing risk

Danger of trauma: The pulling power is so great that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.

Danger to pacemakers

Individuals with a ICD have to maintain an absolute distance from magnets. The magnetic field can stop the functioning of the life-saving device.

Caution required

Exercise caution. Neodymium magnets attract from a long distance and snap with huge force, often faster than you can move away.

Threat to electronics

Do not bring magnets near a purse, laptop, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Magnet fragility

NdFeB magnets are ceramic materials, which means they are very brittle. Impact of two magnets leads to them breaking into shards.

Nickel coating and allergies

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If an allergic reaction happens, cease working with magnets and wear gloves.

Threat to navigation

GPS units and mobile phones are highly susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Combustion hazard

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

Maximum temperature

Avoid heat. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Choking Hazard

Absolutely store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets clamping inside the body are very dangerous.

Danger! 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