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MP 20x8/4x5 / N38 - ring magnet

ring magnet

Catalog no 030333

GTIN/EAN: 5906301812272

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

11.31 g

Magnetization Direction

↑ axial

Load capacity

6.65 kg / 65.21 N

Magnetic Induction

277.16 mT / 2772 Gs

Coating

[NiCuNi] Nickel

product parameters »

7.75 ZŁ with VAT / pcs + price for transport

6.30 ZŁ net + 23% VAT / pcs

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Force along with structure of a neodymium magnet can be verified with our our magnetic calculator.

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Technical specification - MP 20x8/4x5 / N38 - ring magnet

Specification / characteristics - MP 20x8/4x5 / N38 - ring magnet

properties
properties values
Cat. no. 030333
GTIN/EAN 5906301812272
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 20 mm [±0,1 mm]
internal diameter Ø 8/4 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 11.31 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.65 kg / 65.21 N
Magnetic Induction ~ ? 277.16 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8/4x5 / 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 magnet - technical parameters

Presented values represent the outcome of a engineering calculation. Results were calculated on models for the class Nd2Fe14B. Real-world performance may differ from theoretical values. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs distance) - power drop
MP 20x8/4x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2424 Gs
242.4 mT
 6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
 warning
1 mm 2265 Gs
226.5 mT
 5.81 kg / 12.80 LBS
5807.9 g / 57.0 N
 warning
2 mm 2070 Gs
207.0 mT
 4.85 kg / 10.69 LBS
4851.0 g / 47.6 N
 warning
3 mm 1858 Gs
185.8 mT
 3.91 kg / 8.61 LBS
3906.5 g / 38.3 N
 warning
5 mm 1437 Gs
143.7 mT
 2.34 kg / 5.16 LBS
2338.7 g / 22.9 N
 warning
10 mm 691 Gs
69.1 mT
 0.54 kg / 1.19 LBS
540.5 g / 5.3 N
 safe
15 mm 343 Gs
34.3 mT
 0.13 kg / 0.29 LBS
133.3 g / 1.3 N
 safe
20 mm 186 Gs
18.6 mT
 0.04 kg / 0.09 LBS
39.3 g / 0.4 N
 safe
30 mm 70 Gs
7.0 mT
 0.01 kg / 0.01 LBS
5.5 g / 0.1 N
 safe
50 mm 18 Gs
1.8 mT
 0.00 kg / 0.00 LBS
0.4 g / 0.0 N
 safe
Grip strength decreases sharply per each millimeter of distance. Keep in mind that even a microscopic distance (e.g., dirt, varnish, veneer) noticeably reduces the pull force. Neodymiums work strongest at the point of direct contact; distance weakens the power. Notice how rapidly the parameters fall, when the product does not touch tightly to the steel surface. When calculating the arrangement, discard unnecessary gaps.

Table 2: Sliding hold (wall)
MP 20x8/4x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.33 kg / 2.93 LBS
1330.0 g / 13.0 N
1 mm Stal (~0.2) 1.16 kg / 2.56 LBS
1162.0 g / 11.4 N
2 mm Stal (~0.2) 0.97 kg / 2.14 LBS
970.0 g / 9.5 N
3 mm Stal (~0.2) 0.78 kg / 1.72 LBS
782.0 g / 7.7 N
5 mm Stal (~0.2) 0.47 kg / 1.03 LBS
468.0 g / 4.6 N
10 mm Stal (~0.2) 0.11 kg / 0.24 LBS
108.0 g / 1.1 N
15 mm Stal (~0.2) 0.03 kg / 0.06 LBS
26.0 g / 0.3 N
20 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
This section defines the approximate force needed to start the slippage of the magnet vertically against a vertical steel wall (assuming standard friction coefficient). This value varies with the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MP 20x8/4x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.00 kg / 4.40 LBS
1995.0 g / 19.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.33 kg / 2.93 LBS
1330.0 g / 13.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.67 kg / 1.47 LBS
665.0 g / 6.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.33 kg / 7.33 LBS
3325.0 g / 32.6 N
When mounting a magnet on a upright surface (e.g., a fridge), it will maintain only about 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip cause that holders move down easier than they pull off. Planning a vertical fastening? Consider that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the magnet will slide down under a significantly smaller weight. Application of an anti-slip layer can significantly improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 20x8/4x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.67 kg / 1.47 LBS
665.0 g / 6.5 N
1 mm
25%
 1.66 kg / 3.67 LBS
1662.5 g / 16.3 N
2 mm
50%
 3.33 kg / 7.33 LBS
3325.0 g / 32.6 N
3 mm
75%
 4.99 kg / 11.00 LBS
4987.5 g / 48.9 N
5 mm
100%
 6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
10 mm
100%
 6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
11 mm
100%
 6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
12 mm
100%
 6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
A thin sheet is unable to take in the entire magnetic field, which wastes potential of the magnet. If you mount a strong magnet to a too thin substrate, the field will pass right through and the attraction force will be weaker. To achieve 100% of this magnet's potential, you need a suitably thick backing of steel. The saturation effect means that on sheet metal structures (e.g., thin profiles), the magnet shows lower pull force. We suggest choosing the steel thickness from these parameters.

Table 5: Thermal stability (stability) - resistance threshold
MP 20x8/4x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.65 kg / 14.66 LBS
6650.0 g / 65.2 N
 OK
40 °C -2.2% 6.50 kg / 14.34 LBS
6503.7 g / 63.8 N
 OK
60 °C -4.4% 6.36 kg / 14.02 LBS
6357.4 g / 62.4 N
80 °C -6.6% 6.21 kg / 13.69 LBS
6211.1 g / 60.9 N
100 °C -28.8% 4.73 kg / 10.44 LBS
4734.8 g / 46.4 N
Ordinary NdFeB products irreversibly lose strength above the temperature limit. Watch out for overheating – excessive heat can permanently demagnetize this product. With increasing heat, the magnet's capacity momentarily decreases. Refrain from using this magnet close to heaters exceeding its operating temperature limit. Too high temperature will cause destruction of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Flat magnets (pancake types) risk losing magnetic properties under lower heat stress than long magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 20x8/4x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.28 kg / 20.47 LBS
4 012 Gs
1.39 kg / 3.07 LBS
1393 g / 13.7 N
 N/A
1 mm 8.73 kg / 19.25 LBS
4 701 Gs
1.31 kg / 2.89 LBS
1310 g / 12.8 N
 7.86 kg / 17.33 LBS
~0 Gs
2 mm 8.11 kg / 17.88 LBS
4 530 Gs
1.22 kg / 2.68 LBS
1216 g / 11.9 N
 7.30 kg / 16.09 LBS
~0 Gs
3 mm 7.45 kg / 16.42 LBS
4 342 Gs
1.12 kg / 2.46 LBS
1117 g / 11.0 N
 6.70 kg / 14.78 LBS
~0 Gs
5 mm 6.10 kg / 13.45 LBS
3 930 Gs
0.92 kg / 2.02 LBS
915 g / 9.0 N
 5.49 kg / 12.11 LBS
~0 Gs
10 mm 3.27 kg / 7.20 LBS
2 875 Gs
0.49 kg / 1.08 LBS
490 g / 4.8 N
 2.94 kg / 6.48 LBS
~0 Gs
20 mm 0.75 kg / 1.66 LBS
1 382 Gs
0.11 kg / 0.25 LBS
113 g / 1.1 N
 0.68 kg / 1.50 LBS
~0 Gs
50 mm 0.02 kg / 0.04 LBS
220 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.04 LBS
~0 Gs
60 mm 0.01 kg / 0.02 LBS
139 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.01 LBS
93 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
65 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
47 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
35 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnetic products interact from a wider radius than a neodymium and metal combination. The setup of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Planning to create a strong closure? Apply two magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the impact force is extreme. The repulsion force is a bit weaker than the attraction, but still impressive.
*Field value in repulsion mode drops to ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Note: Results apply to shear force of two matching magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - precautionary measures
MP 20x8/4x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.0 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Timepiece 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Car key 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Powerful magnet radiation poses a real danger to electronics and pacemakers. These neodymiums generate a flux that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation passes through tissues and plastic. Special caution must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - collision effects
MP 20x8/4x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.67 km/h
(7.13 m/s)
 0.29 J
30 mm 42.38 km/h
(11.77 m/s)
 0.78 J
50 mm 54.68 km/h
(15.19 m/s)
 1.30 J
100 mm 77.33 km/h
(21.48 m/s)
 2.61 J
Neodymium magnets are very brittle – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose turns into a projectile. Striking energy can cause material chips or painful pinches to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear eye protection when playing with powerful specimens.

Table 9: Coating parameters (durability)
MP 20x8/4x5 / 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 following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MP 20x8/4x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 7 218 Mx 72.2 µWb
Pc Coefficient 0.31 Low (Flat)
Total magnetic flux emitted by the pole surface. Key data for generator designers and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MP 20x8/4x5 / N38

Environment Effective steel pull Effect
Air (land) 6.65 kg Standard
Water (riverbed) 7.61 kg
(+0.96 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Note: On a vertical surface, the magnet holds just a fraction of its nominal pull.

2. Plate thickness effect

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

3. Temperature resistance

*For standard magnets, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.31

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
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%
Sustainability
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: 030333-2026
Measurement Calculator
Force (pull)
Magnetic Field
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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. 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. One turn too many can destroy the magnet, so do it slowly. 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. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 8/4 mm fits this model. 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 (20 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø20x5 mm and a weight of 11.31 g. The pulling force of this model is an impressive 6.65 kg, which translates to 65.21 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 8/4 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 Nd2Fe14B magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their strength is maintained, and after around ten years it drops only by ~1% (according to research),
  • They are resistant to demagnetization induced by presence of other magnetic fields,
  • In other words, due to the shiny layer of silver, the element becomes visually attractive,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • 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...
  • Thanks to flexibility in shaping and the capacity to customize to complex applications,
  • Significant place in modern technologies – they are used in magnetic memories, brushless drives, precision medical tools, also multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in force. 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in producing threads and complex forms in magnets, we propose using casing - magnetic holder.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these products can 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 can limit application in large quantities

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

Magnet power was determined for the most favorable conditions, assuming:
  • on a plate made of structural steel, optimally conducting the magnetic field
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with a plane free of scratches
  • without any air gap between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • at temperature room level

Determinants of practical lifting force of a magnet

Bear in mind that the working load will differ depending on the following factors, starting with the most relevant:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – the best choice is high-permeability steel. Stainless steels may attract less.
  • Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Safe handling of neodymium magnets
Handling guide

Be careful. Rare earth magnets attract from a long distance and connect with massive power, often faster than you can react.

Operating temperature

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

Warning for heart patients

Patients with a heart stimulator have to maintain an safe separation from magnets. The magnetism can interfere with the operation of the life-saving device.

Swallowing risk

Adult use only. Small elements can be swallowed, causing serious injuries. Keep away from children and animals.

Avoid contact if allergic

Medical facts indicate that nickel (standard magnet coating) is a potent allergen. If you have an allergy, avoid touching magnets with bare hands and select versions in plastic housing.

Protect data

Data protection: Neodymium magnets can damage data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).

Fragile material

NdFeB magnets are sintered ceramics, meaning they are very brittle. Collision of two magnets will cause them breaking into shards.

Crushing force

Mind your fingers. Two large magnets will join immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Dust is flammable

Dust created during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Threat to navigation

Note: rare earth magnets generate a field that disrupts precision electronics. Keep a separation from your phone, tablet, and navigation systems.

Safety First! Want to know more? Read our article: Are neodymium magnets dangerous?