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MP 22x6x10 / N38 - ring magnet

ring magnet

Catalog no 030394

GTIN/EAN: 5906301812319

5.00

Diameter

22 mm [±0,1 mm]

internal diameter Ø

6 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

26.39 g

Magnetization Direction

↑ axial

Load capacity

13.65 kg / 133.89 N

Magnetic Induction

416.85 mT / 4168 Gs

Coating

[NiCuNi] Nickel

13.95 with VAT / pcs + price for transport

11.34 ZŁ net + 23% VAT / pcs

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Technical specification - MP 22x6x10 / N38 - ring magnet

Specification / characteristics - MP 22x6x10 / N38 - ring magnet

properties
properties values
Cat. no. 030394
GTIN/EAN 5906301812319
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 22 mm [±0,1 mm]
internal diameter Ø 6 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 26.39 g
Magnetization Direction ↑ axial
Load capacity ~ ? 13.65 kg / 133.89 N
Magnetic Induction ~ ? 416.85 mT / 4168 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 22x6x10 / 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 magnet - report

These values constitute the outcome of a physical analysis. Results rely on models for the class Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - interaction chart
MP 22x6x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5864 Gs
586.4 mT
13.65 kg / 30.09 pounds
13650.0 g / 133.9 N
crushing
1 mm 5326 Gs
532.6 mT
11.26 kg / 24.83 pounds
11261.1 g / 110.5 N
crushing
2 mm 4795 Gs
479.5 mT
9.13 kg / 20.12 pounds
9127.3 g / 89.5 N
strong
3 mm 4288 Gs
428.8 mT
7.30 kg / 16.09 pounds
7299.8 g / 71.6 N
strong
5 mm 3381 Gs
338.1 mT
4.54 kg / 10.01 pounds
4539.0 g / 44.5 N
strong
10 mm 1830 Gs
183.0 mT
1.33 kg / 2.93 pounds
1329.4 g / 13.0 N
weak grip
15 mm 1039 Gs
103.9 mT
0.43 kg / 0.95 pounds
428.7 g / 4.2 N
weak grip
20 mm 635 Gs
63.5 mT
0.16 kg / 0.35 pounds
159.9 g / 1.6 N
weak grip
30 mm 285 Gs
28.5 mT
0.03 kg / 0.07 pounds
32.1 g / 0.3 N
weak grip
50 mm 90 Gs
9.0 mT
0.00 kg / 0.01 pounds
3.2 g / 0.0 N
weak grip

Table 2: Slippage capacity (vertical surface)
MP 22x6x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.73 kg / 6.02 pounds
2730.0 g / 26.8 N
1 mm Stal (~0.2) 2.25 kg / 4.96 pounds
2252.0 g / 22.1 N
2 mm Stal (~0.2) 1.83 kg / 4.03 pounds
1826.0 g / 17.9 N
3 mm Stal (~0.2) 1.46 kg / 3.22 pounds
1460.0 g / 14.3 N
5 mm Stal (~0.2) 0.91 kg / 2.00 pounds
908.0 g / 8.9 N
10 mm Stal (~0.2) 0.27 kg / 0.59 pounds
266.0 g / 2.6 N
15 mm Stal (~0.2) 0.09 kg / 0.19 pounds
86.0 g / 0.8 N
20 mm Stal (~0.2) 0.03 kg / 0.07 pounds
32.0 g / 0.3 N
30 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (shearing) - vertical pull
MP 22x6x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.10 kg / 9.03 pounds
4095.0 g / 40.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.73 kg / 6.02 pounds
2730.0 g / 26.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.37 kg / 3.01 pounds
1365.0 g / 13.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.83 kg / 15.05 pounds
6825.0 g / 67.0 N

Table 4: Steel thickness (substrate influence) - power losses
MP 22x6x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.68 kg / 1.50 pounds
682.5 g / 6.7 N
1 mm
13%
1.71 kg / 3.76 pounds
1706.3 g / 16.7 N
2 mm
25%
3.41 kg / 7.52 pounds
3412.5 g / 33.5 N
3 mm
38%
5.12 kg / 11.28 pounds
5118.8 g / 50.2 N
5 mm
63%
8.53 kg / 18.81 pounds
8531.3 g / 83.7 N
10 mm
100%
13.65 kg / 30.09 pounds
13650.0 g / 133.9 N
11 mm
100%
13.65 kg / 30.09 pounds
13650.0 g / 133.9 N
12 mm
100%
13.65 kg / 30.09 pounds
13650.0 g / 133.9 N

Table 5: Thermal stability (stability) - resistance threshold
MP 22x6x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 13.65 kg / 30.09 pounds
13650.0 g / 133.9 N
OK
40 °C -2.2% 13.35 kg / 29.43 pounds
13349.7 g / 131.0 N
OK
60 °C -4.4% 13.05 kg / 28.77 pounds
13049.4 g / 128.0 N
OK
80 °C -6.6% 12.75 kg / 28.11 pounds
12749.1 g / 125.1 N
100 °C -28.8% 9.72 kg / 21.43 pounds
9718.8 g / 95.3 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 22x6x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 54.34 kg / 119.79 pounds
6 106 Gs
8.15 kg / 17.97 pounds
8151 g / 80.0 N
N/A
1 mm 49.50 kg / 109.14 pounds
11 193 Gs
7.43 kg / 16.37 pounds
7426 g / 72.8 N
44.55 kg / 98.22 pounds
~0 Gs
2 mm 44.83 kg / 98.83 pounds
10 652 Gs
6.72 kg / 14.82 pounds
6724 g / 66.0 N
40.34 kg / 88.94 pounds
~0 Gs
3 mm 40.43 kg / 89.14 pounds
10 116 Gs
6.06 kg / 13.37 pounds
6065 g / 59.5 N
36.39 kg / 80.22 pounds
~0 Gs
5 mm 32.54 kg / 71.74 pounds
9 075 Gs
4.88 kg / 10.76 pounds
4881 g / 47.9 N
29.29 kg / 64.57 pounds
~0 Gs
10 mm 18.07 kg / 39.83 pounds
6 762 Gs
2.71 kg / 5.98 pounds
2710 g / 26.6 N
16.26 kg / 35.85 pounds
~0 Gs
20 mm 5.29 kg / 11.67 pounds
3 660 Gs
0.79 kg / 1.75 pounds
794 g / 7.8 N
4.76 kg / 10.50 pounds
~0 Gs
50 mm 0.27 kg / 0.60 pounds
828 Gs
0.04 kg / 0.09 pounds
41 g / 0.4 N
0.24 kg / 0.54 pounds
~0 Gs
60 mm 0.13 kg / 0.28 pounds
569 Gs
0.02 kg / 0.04 pounds
19 g / 0.2 N
0.12 kg / 0.25 pounds
~0 Gs
70 mm 0.07 kg / 0.15 pounds
408 Gs
0.01 kg / 0.02 pounds
10 g / 0.1 N
0.06 kg / 0.13 pounds
~0 Gs
80 mm 0.04 kg / 0.08 pounds
303 Gs
0.01 kg / 0.01 pounds
5 g / 0.1 N
0.03 kg / 0.07 pounds
~0 Gs
90 mm 0.02 kg / 0.05 pounds
231 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
0.02 kg / 0.04 pounds
~0 Gs
100 mm 0.01 kg / 0.03 pounds
180 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
0.01 kg / 0.03 pounds
~0 Gs

Table 7: Protective zones (electronics) - precautionary measures
MP 22x6x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 15.5 cm
Hearing aid 10 Gs (1.0 mT) 12.0 cm
Timepiece 20 Gs (2.0 mT) 9.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 7.0 cm
Car key 50 Gs (5.0 mT) 6.5 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 (cracking risk) - collision effects
MP 22x6x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.29 km/h
(6.75 m/s)
0.60 J
30 mm 39.79 km/h
(11.05 m/s)
1.61 J
50 mm 51.30 km/h
(14.25 m/s)
2.68 J
100 mm 72.53 km/h
(20.15 m/s)
5.36 J

Table 9: Coating parameters (durability)
MP 22x6x10 / 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 (Pc)
MP 22x6x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 465 Mx 164.7 µWb
Pc Coefficient 1.13 High (Stable)

Table 11: Hydrostatics and buoyancy
MP 22x6x10 / N38

Environment Effective steel pull Effect
Air (land) 13.65 kg Standard
Water (riverbed) 15.63 kg
(+1.98 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!
1. Vertical hold

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

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.13

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 specification and ecology
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%
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: 030394-2026
Magnet Unit Converter
Magnet pull force

Field Strength

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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 quick installation to wood, wall, plastic, or metal. 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 does not ensure full waterproofing. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
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 (22 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø22 mm (outer diameter) and height 10 mm. The pulling force of this model is an impressive 13.65 kg, which translates to 133.89 N in newtons. The mounting hole diameter is precisely 6 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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.

Advantages as well as disadvantages of neodymium magnets.

Pros

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • They are extremely resistant to demagnetization induced by external disturbances,
  • By covering with a decorative coating of nickel, the element presents an professional look,
  • Magnets possess huge magnetic induction on the working surface,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Thanks to freedom in constructing and the capacity to modify to unusual requirements,
  • Versatile presence in modern industrial fields – they are commonly used in mass storage devices, brushless drives, medical devices, as well as technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and 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 usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in creating nuts and complex shapes in magnets, we propose using cover - magnetic mount.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these products can be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat affects it?

The declared magnet strength refers to the peak performance, obtained under ideal test conditions, meaning:
  • on a block made of structural steel, optimally conducting the magnetic field
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • without the slightest insulating layer between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is influenced by working environment parameters, such as (from priority):
  • Distance – the presence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and lifting capacity.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Heat – NdFeB sinters 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 measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.

Precautions when working with NdFeB magnets
Allergic reactions

Certain individuals suffer from a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Frequent touching might lead to dermatitis. It is best to wear safety gloves.

Swallowing risk

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

Safe distance

Powerful magnetic fields can erase data on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Warning for heart patients

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Magnetic interference

A powerful magnetic field disrupts the functioning of compasses in phones and navigation systems. Maintain magnets close to a smartphone to prevent damaging the sensors.

Power loss in heat

Control the heat. Heating the magnet to high heat will ruin its magnetic structure and pulling force.

Pinching danger

Large magnets can smash fingers instantly. Do not put your hand betwixt two strong magnets.

Do not underestimate power

Exercise caution. Rare earth magnets act from a long distance and connect with huge force, often faster than you can move away.

Flammability

Combustion risk: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.

Fragile material

Watch out for shards. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. We recommend safety glasses.

Safety First! Need more info? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98