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MP 40x22x10 / N38 - ring magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: PLN 1-6500
Rating: 5

ring magnet

Catalog no 030344

GTIN/EAN: 5906301812296

5.00

Diameter

40 mm [±0,1 mm]

internal diameter Ø

22 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

65.74 g

Magnetization Direction

↑ axial

Load capacity

19.34 kg / 189.71 N

Magnetic Induction

277.22 mT / 2772 Gs

Coating

[NiCuNi] Nickel

see technical data »

40.59 ZŁ with VAT / pcs + price for transport

33.00 ZŁ net + 23% VAT / pcs

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Technical data of the product - MP 40x22x10 / N38 - ring magnet

Specification / characteristics - MP 40x22x10 / N38 - ring magnet

properties

properties	values
Cat. no.	030344
GTIN/EAN	5906301812296
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	40 mm [±0,1 mm]
internal diameter Ø	22 mm [±0,1 mm]
Height	10 mm [±0,1 mm]
Weight	65.74 g
Magnetization Direction	↑ axial
Load capacity ~ ?	19.34 kg / 189.71 N
Magnetic Induction ~ ?	277.22 mT / 2772 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 40x22x10 / 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

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 analysis of the product - data

The following information constitute the direct effect of a engineering simulation. Results are based on algorithms for the material Nd₂Fe₁₄B. Operational conditions may differ. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - power drop
MP 40x22x10 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5269 Gs 526.9 mT	19.34 kg / 19340.0 g 189.7 N	critical level
1 mm	5005 Gs 500.5 mT	17.46 kg / 17455.9 g 171.2 N	critical level
2 mm	4739 Gs 473.9 mT	15.65 kg / 15647.5 g 153.5 N	critical level
3 mm	4475 Gs 447.5 mT	13.95 kg / 13950.0 g 136.8 N	critical level
5 mm	3960 Gs 396.0 mT	10.93 kg / 10927.7 g 107.2 N	critical level
10 mm	2832 Gs 283.2 mT	5.59 kg / 5589.2 g 54.8 N	medium risk
15 mm	1990 Gs 199.0 mT	2.76 kg / 2760.5 g 27.1 N	medium risk
20 mm	1407 Gs 140.7 mT	1.38 kg / 1379.2 g 13.5 N	low risk
30 mm	745 Gs 74.5 mT	0.39 kg / 386.2 g 3.8 N	low risk
50 mm	268 Gs 26.8 mT	0.05 kg / 50.1 g 0.5 N	low risk

Pulling power decreases sharply with every mm of spacing. Note that even the smallest gap (e.g., contamination, varnish, rust) noticeably weakens the grip. Magnets hold strongest at the point of direct contact; air break drastically cuts the force. Notice how flashily the pull force drop, when the magnet does not touch directly to the steel surface. When planning the assembly, avoid unnecessary gaps.

Table 2: Vertical capacity (wall)
MP 40x22x10 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	3.87 kg / 3868.0 g 37.9 N
1 mm	Stal (~0.2)	3.49 kg / 3492.0 g 34.3 N
2 mm	Stal (~0.2)	3.13 kg / 3130.0 g 30.7 N
3 mm	Stal (~0.2)	2.79 kg / 2790.0 g 27.4 N
5 mm	Stal (~0.2)	2.19 kg / 2186.0 g 21.4 N
10 mm	Stal (~0.2)	1.12 kg / 1118.0 g 11.0 N
15 mm	Stal (~0.2)	0.55 kg / 552.0 g 5.4 N
20 mm	Stal (~0.2)	0.28 kg / 276.0 g 2.7 N
30 mm	Stal (~0.2)	0.08 kg / 78.0 g 0.8 N
50 mm	Stal (~0.2)	0.01 kg / 10.0 g 0.1 N

The table below defines the approximate shear load necessary to cause the sliding of the magnet down along a vertical steel wall (considering typical friction). The holding force is a function of the distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 40x22x10 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	5.80 kg / 5802.0 g 56.9 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	3.87 kg / 3868.0 g 37.9 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.93 kg / 1934.0 g 19.0 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	9.67 kg / 9670.0 g 94.9 N

When mounting a holder on a upright plane (e.g., a fridge), it will only hold just approx. 1/5 of its maximum pull force. Gravity and a low friction coefficient influence the fact that magnets move down faster than they detach. Planning a vertical fastening? Remember that the sliding force is much weaker than the maximum static pull force. On a slippery surface, the element will give way down under a significantly smaller load. Using a rubber layer can significantly raise the stability.

Table 4: Steel thickness (saturation) - power losses
MP 40x22x10 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	0.97 kg / 967.0 g 9.5 N
1 mm	13%	2.42 kg / 2417.5 g 23.7 N
2 mm	25%	4.84 kg / 4835.0 g 47.4 N
5 mm	63%	12.09 kg / 12087.5 g 118.6 N
10 mm	100%	19.34 kg / 19340.0 g 189.7 N

A thin metal plate is not enough to take in the entire magnetic field, which weakens actual performance of the magnet. Should you install a neodymium to a too thin substrate, the field will penetrate right through and the pull force will drop sharply. To achieve 100% of this magnet's power, you require a sufficiently solid element of steel. The saturation effect causes that on delicate walls (e.g., thin profiles), the holder holds weaker. We advise picking the steel thickness according to the table below.

Table 5: Thermal resistance (stability) - power drop
MP 40x22x10 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	19.34 kg / 19340.0 g 189.7 N	OK
40 °C	-2.2%	18.91 kg / 18914.5 g 185.6 N	OK
60 °C	-4.4%	18.49 kg / 18489.0 g 181.4 N	OK
80 °C	-6.6%	18.06 kg / 18063.6 g 177.2 N
100 °C	-28.8%	13.77 kg / 13770.1 g 135.1 N

Classic neodymiums lose strength after exceeding the maximum temperature. Watch out for overheating – heat can irreversibly destroy this magnet. As the temperature rises, the magnet's force temporarily decreases. Avoid using this magnet in hot environments higher than its operating temperature limit. Exceeding the critical threshold will result in permanent loss of magnetic properties.

*Engineering note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) may lose charge permanently at lower temperatures compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 40x22x10 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	171.37 kg / 171369 g 1681.1 N 5 920 Gs	N/A
1 mm	163.01 kg / 163013 g 1599.2 N 10 277 Gs	146.71 kg / 146712 g 1439.2 N ~0 Gs
2 mm	154.67 kg / 154674 g 1517.4 N 10 011 Gs	139.21 kg / 139207 g 1365.6 N ~0 Gs
3 mm	146.55 kg / 146547 g 1437.6 N 9 744 Gs	131.89 kg / 131893 g 1293.9 N ~0 Gs
5 mm	131.00 kg / 131000 g 1285.1 N 9 213 Gs	117.90 kg / 117900 g 1156.6 N ~0 Gs
10 mm	96.83 kg / 96829 g 949.9 N 7 921 Gs	87.15 kg / 87146 g 854.9 N ~0 Gs
20 mm	49.53 kg / 49525 g 485.8 N 5 665 Gs	44.57 kg / 44573 g 437.3 N ~0 Gs
50 mm	6.33 kg / 6326 g 62.1 N 2 025 Gs	5.69 kg / 5694 g 55.9 N ~0 Gs

Two magnets interact from a much further distance than a magnet and sheet setup. The setup of two magnets creates a more powerful interaction and a wider radius of action. Want to build a powerful holder? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the collision energy is huge. The repulsion force is marginally weaker than the connection force, but still large.
*Field value between like poles drops to ~0 Gs at the geometric center between the magnets (resulting from vector opposition).

Table 7: Hazards (implants) - warnings
MP 40x22x10 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	24.0 cm
Hearing aid	10 Gs (1.0 mT)	18.5 cm
Timepiece	20 Gs (2.0 mT)	14.5 cm
Mobile device	40 Gs (4.0 mT)	11.0 cm
Remote	50 Gs (5.0 mT)	10.5 cm
Payment card	400 Gs (40.0 mT)	4.5 cm
HDD hard drive	600 Gs (60.0 mT)	3.5 cm

Powerful magnet radiation is a large risk to electronics and pacemakers. These magnets produce a flux that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and plastic. Increased vigilance must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MP 40x22x10 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	20.18 km/h (5.61 m/s)	1.03 J
30 mm	30.33 km/h (8.43 m/s)	2.33 J
50 mm	38.74 km/h (10.76 m/s)	3.81 J
100 mm	54.70 km/h (15.20 m/s)	7.59 J

Magnetic elements are very brittle – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can trigger coating fragments or dangerous crushing to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear eye protection when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MP 40x22x10 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MP 40x22x10 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	54 070 Mx	540.7 µWb
P_c Coefficient	0.81	High (Stable)

Total magnetic flux emitted by the pole surface. Key data in coil applications and motors. The P_c coefficient determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MP 40x22x10 / N38

Environment	Effective steel pull	Effect
Air (land)	19.34 kg	Standard
Water (riverbed)	22.14 kg (+2.80 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.

Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.

1. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains only a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Temperature resistance

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.81

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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 P_c (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 P_c 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

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%

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: 030344-2025

Magnet Unit Converter

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Newtons (N)

Force in lbs

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The ring magnet with a hole MP 40x22x10 / N38 is created for permanent mounting, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 19.34 kg works great as a door latch, speaker holder, or mounting element in devices.

This is a crucial issue when working with model MP 40x22x10 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. 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. This product is dedicated for inside building 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. Aesthetic mounting requires selecting the appropriate head size.

This model is characterized by dimensions Ø40x10 mm and a weight of 65.74 g. The pulling force of this model is an impressive 19.34 kg, which translates to 189.71 N in newtons. The mounting hole diameter is precisely 22 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros as well as cons of neodymium magnets.

Benefits

Besides their immense strength, neodymium magnets offer the following advantages:

They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
Magnets effectively resist against demagnetization caused by foreign field sources,
By using a smooth coating of nickel, the element presents an nice look,
Magnets are distinguished by maximum magnetic induction on the working surface,
Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
Possibility of custom modeling as well as optimizing to specific needs,
Universal use in innovative solutions – they serve a role in hard drives, drive modules, precision medical tools, and modern systems.
Thanks to their power density, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of NdFeB magnets:

To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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
Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
Due to limitations in producing nuts and complex shapes in magnets, we propose using a housing - magnetic mechanism.
Health risk to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these devices can disrupt the diagnostic process medical in case of swallowing.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

Information about lifting capacity was determined for optimal configuration, including:

on a plate made of structural steel, optimally conducting the magnetic flux
with a cross-section no less than 10 mm
with a plane free of scratches
under conditions of no distance (surface-to-surface)
during detachment in a direction perpendicular to the plane
at conditions approx. 20°C

Lifting capacity in practice – influencing factors

In real-world applications, the actual holding force depends on many variables, ranked from most significant:

Distance (between the magnet and the plate), as even a microscopic clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
Plate thickness – too thin plate does not close the flux, causing part of the power to be escaped into the air.
Plate material – low-carbon steel attracts best. Alloy admixtures reduce magnetic permeability and lifting capacity.
Plate texture – ground elements guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was assessed by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

H&S for magnets

Product not for children

These products are not intended for children. Swallowing several magnets can lead to them attracting across intestines, which constitutes a direct threat to life and necessitates immediate surgery.

Do not drill into magnets

Dust generated during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Electronic hazard

Data protection: Strong magnets can damage payment cards and sensitive devices (heart implants, medical aids, timepieces).

Danger to pacemakers

Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or request help to work with the magnets.

Fragile material

Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Crushing risk

Large magnets can crush fingers in a fraction of a second. Do not place your hand betwixt two attracting surfaces.

Phone sensors

Remember: neodymium magnets produce a field that disrupts precision electronics. Maintain a safe distance from your phone, device, and GPS.

Do not overheat magnets

Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Handling guide

Before starting, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

Allergy Warning

Allergy Notice: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, cease working with magnets and use protective gear.

Safety First! Want to know more? Check our post: Are neodymium magnets dangerous?

MP 40x22x10 / N38 - ring magnet

Technical data of the product - MP 40x22x10 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the product - data

Table 1: Static pull force (pull vs distance) - power drop MP 40x22x10 / N38

Table 2: Vertical capacity (wall) MP 40x22x10 / N38

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces MP 40x22x10 / N38

Table 4: Steel thickness (saturation) - power losses MP 40x22x10 / N38

Table 5: Thermal resistance (stability) - power drop MP 40x22x10 / N38

Table 6: Magnet-Magnet interaction (attraction) - field collision MP 40x22x10 / N38

Table 7: Hazards (implants) - warnings MP 40x22x10 / N38

Table 8: Dynamics (kinetic energy) - warning MP 40x22x10 / N38

Table 9: Anti-corrosion coating durability MP 40x22x10 / N38

Table 10: Electrical data (Flux) MP 40x22x10 / N38

Table 11: Hydrostatics and buoyancy MP 40x22x10 / N38

1. Wall mount (shear)

2. Steel thickness impact

3. Temperature resistance

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

Chemical composition

Ecology and recycling (GPSR)

Pulling force

Field Strength

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Pros as well as cons of neodymium magnets.

Benefits

Weaknesses

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

Lifting capacity in practice – influencing factors

H&S for magnets

Product not for children

Do not drill into magnets

Electronic hazard

Danger to pacemakers

Fragile material

Crushing risk

Phone sensors

Do not overheat magnets

Handling guide

Allergy Warning

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs distance) - power drop
MP 40x22x10 / N38

Table 2: Vertical capacity (wall)
MP 40x22x10 / N38

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 40x22x10 / N38

Table 4: Steel thickness (saturation) - power losses
MP 40x22x10 / N38

Table 5: Thermal resistance (stability) - power drop
MP 40x22x10 / N38

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 40x22x10 / N38

Table 7: Hazards (implants) - warnings
MP 40x22x10 / N38

Table 8: Dynamics (kinetic energy) - warning
MP 40x22x10 / N38

Table 9: Anti-corrosion coating durability
MP 40x22x10 / N38

Table 10: Electrical data (Flux)
MP 40x22x10 / N38

Table 11: Hydrostatics and buoyancy
MP 40x22x10 / N38