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MP 10x7/3.5x3 / N38 - ring magnet

ring magnet

Catalog no 030180

GTIN/EAN: 5906301811978

5.00
Load capacity 1.88 kg / 18.47 N Magnetic Induction 318.70 mT / 3187 Gs
Diameter
10 mm [±0,1 mm]
internal diameter Ø
7/3.5 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
1.55 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
see technical specifications »

0.824 zł with VAT / pcs + price for transport

0.670 zł net + 23% VAT / pcs

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical of the product - MP 10x7/3.5x3 / N38 - ring magnet

Specification / characteristics - MP 10x7/3.5x3 / N38 - ring magnet

properties
properties values
Cat. no. 030180
GTIN/EAN 5906301811978
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 10 mm [±0,1 mm]
internal diameter Ø 7/3.5 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 1.55 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.88 kg / 18.47 N
Magnetic Induction ~ ? 318.70 mT / 3187 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 10x7/3.5x3 / 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 magnet - report

Presented values constitute the direct effect of a physical analysis. Values rely on models for the material Nd2Fe14B. Operational conditions may differ from theoretical values. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs distance) - characteristics
MP 10x7/3.5x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2813 Gs
281.3 mT
 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
 weak grip
1 mm 2373 Gs
237.3 mT
 1.34 kg / 2.95 LBS
1338.1 g / 13.1 N
 weak grip
2 mm 1870 Gs
187.0 mT
 0.83 kg / 1.83 LBS
830.9 g / 8.2 N
 weak grip
3 mm 1416 Gs
141.6 mT
 0.48 kg / 1.05 LBS
476.6 g / 4.7 N
 weak grip
5 mm 785 Gs
78.5 mT
 0.15 kg / 0.32 LBS
146.4 g / 1.4 N
 weak grip
10 mm 214 Gs
21.4 mT
 0.01 kg / 0.02 LBS
10.9 g / 0.1 N
 weak grip
15 mm 81 Gs
8.1 mT
 0.00 kg / 0.00 LBS
1.6 g / 0.0 N
 weak grip
20 mm 38 Gs
3.8 mT
 0.00 kg / 0.00 LBS
0.3 g / 0.0 N
 weak grip
30 mm 12 Gs
1.2 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
50 mm 3 Gs
0.3 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
Grip strength weakens sharply with every mm of distance. Keep in mind that even the smallest gap (e.g., contamination, paint, veneer) strongly diminishes the holding power. Magnetic products work strongest at the point of direct contact; gap nullifies the force. See how flashily the pull force drop, when the magnet does not touch flatly to the steel surface. When planning the mounting, discard additional spacers.

Table 2: Slippage hold (vertical surface)
MP 10x7/3.5x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.38 kg / 0.83 LBS
376.0 g / 3.7 N
1 mm Stal (~0.2) 0.27 kg / 0.59 LBS
268.0 g / 2.6 N
2 mm Stal (~0.2) 0.17 kg / 0.37 LBS
166.0 g / 1.6 N
3 mm Stal (~0.2) 0.10 kg / 0.21 LBS
96.0 g / 0.9 N
5 mm Stal (~0.2) 0.03 kg / 0.07 LBS
30.0 g / 0.3 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 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 needed to cause the sliding of the magnet down on a vertical steel plate (assuming standard friction coefficient). The holding force depends on the air gap between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MP 10x7/3.5x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.56 kg / 1.24 LBS
564.0 g / 5.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.38 kg / 0.83 LBS
376.0 g / 3.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.19 kg / 0.41 LBS
188.0 g / 1.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.94 kg / 2.07 LBS
940.0 g / 9.2 N
When mounting a holder on a upright surface (e.g., a fridge), it will maintain only approx. 1/5 of its nominal power. Gravity as well as a low friction coefficient cause that holders slip easier than they detach. Designing a wall mount? Consider that the shear force is much weaker than the maximum static pull force. On a slippery surface, the element will slip down under a much lighter cargo. Application of an anti-slip layer can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 10x7/3.5x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.19 kg / 0.41 LBS
188.0 g / 1.8 N
1 mm
25%
 0.47 kg / 1.04 LBS
470.0 g / 4.6 N
2 mm
50%
 0.94 kg / 2.07 LBS
940.0 g / 9.2 N
3 mm
75%
 1.41 kg / 3.11 LBS
1410.0 g / 13.8 N
5 mm
100%
 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
10 mm
100%
 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
11 mm
100%
 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
12 mm
100%
 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
A too thin steel cannot focus the entire magnetic field, which wastes potential of the magnet. If you attach a powerful product to a thin surface, the flux will pass right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's power, you need a suitably thick backing of steel. The saturation phenomenon causes that on delicate walls (e.g., appliance housings), the holder shows lower pull force. We recommend selecting the steel cross-section according to the table below.

Table 5: Working in heat (material behavior) - resistance threshold
MP 10x7/3.5x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
 OK
40 °C -2.2% 1.84 kg / 4.05 LBS
1838.6 g / 18.0 N
 OK
60 °C -4.4% 1.80 kg / 3.96 LBS
1797.3 g / 17.6 N
80 °C -6.6% 1.76 kg / 3.87 LBS
1755.9 g / 17.2 N
100 °C -28.8% 1.34 kg / 2.95 LBS
1338.6 g / 13.1 N
Classic neodymiums change their properties parameters after exceeding the maximum temperature. Avoid high temperatures – heat can permanently damage this magnet. With increasing heat, the magnet's force momentarily decreases. Refrain from using this product close to ovens higher than its safe range. Exceeding the critical threshold will lead to destruction of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, as well as the dimension ratios. Flat 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: Magnet-Magnet interaction (repulsion) - forces in the system
MP 10x7/3.5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.86 kg / 6.30 LBS
4 419 Gs
0.43 kg / 0.95 LBS
429 g / 4.2 N
 N/A
1 mm 2.46 kg / 5.43 LBS
5 224 Gs
0.37 kg / 0.81 LBS
370 g / 3.6 N
 2.22 kg / 4.89 LBS
~0 Gs
2 mm 2.03 kg / 4.49 LBS
4 747 Gs
0.31 kg / 0.67 LBS
305 g / 3.0 N
 1.83 kg / 4.04 LBS
~0 Gs
3 mm 1.62 kg / 3.58 LBS
4 242 Gs
0.24 kg / 0.54 LBS
244 g / 2.4 N
 1.46 kg / 3.22 LBS
~0 Gs
5 mm 0.96 kg / 2.12 LBS
3 266 Gs
0.14 kg / 0.32 LBS
144 g / 1.4 N
 0.87 kg / 1.91 LBS
~0 Gs
10 mm 0.22 kg / 0.49 LBS
1 570 Gs
0.03 kg / 0.07 LBS
33 g / 0.3 N
 0.20 kg / 0.44 LBS
~0 Gs
20 mm 0.02 kg / 0.04 LBS
429 Gs
0.00 kg / 0.01 LBS
2 g / 0.0 N
 0.01 kg / 0.03 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
41 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
25 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
16 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
11 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
8 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
6 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 magnet and steel combination. The connection of magnet-to-magnet produces a massive flux and a larger range of action. Want to build a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the pinch force is massive. The repulsion force is marginally weaker than the attraction, but still significant.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Attention: Estimates show friction force of two same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - precautionary measures
MP 10x7/3.5x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.5 cm
Hearing aid 10 Gs (1.0 mT) 3.5 cm
Timepiece 20 Gs (2.0 mT) 3.0 cm
Mobile device 40 Gs (4.0 mT) 2.0 cm
Remote 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field poses a large risk to IT equipment and pacemakers. These magnets generate a field that disrupts operation of digital equipment. Be aware: the invisible magnetic field acts through matter and plastic. Exceptional care must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MP 10x7/3.5x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 26.06 km/h
(7.24 m/s)
 0.04 J
30 mm 26.15 km/h
(7.26 m/s)
 0.04 J
50 mm 26.15 km/h
(7.26 m/s)
 0.04 J
100 mm 26.15 km/h
(7.26 m/s)
 0.04 J
NdFeB products are delicate – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can cause material chips or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the neodymium. Wear safety glasses when playing with powerful specimens.

Table 9: Corrosion resistance
MP 10x7/3.5x3 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MP 10x7/3.5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 899 Mx 19.0 µWb
Pc Coefficient 0.37 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter in coil applications and motors. Pc value determines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 10x7/3.5x3 / N38

Environment Effective steel pull Effect
Air (land) 1.88 kg Standard
Water (riverbed) 2.15 kg
(+0.27 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Vertical hold

*Warning: On a vertical wall, the magnet retains only ~20% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.37

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 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

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%

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: 030180-2026
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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 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 is a crucial issue when working with model MP 10x7/3.5x3 / 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.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. 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.
A screw or bolt with a thread diameter smaller than 7/3.5 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Always check that the screw head is not larger than the outer diameter of the magnet (10 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø10 mm (outer diameter) and height 3 mm. The pulling force of this model is an impressive 1.88 kg, which translates to 18.47 N in newtons. The mounting hole diameter is precisely 7/3.5 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 Nd2Fe14B magnets.

Advantages

Besides their high retention, neodymium magnets are valued for these benefits:
  • They do not lose power, even after around ten years – the reduction in strength is only ~1% (based on measurements),
  • They feature excellent resistance to weakening of magnetic properties when exposed to external fields,
  • Thanks to the reflective finish, the surface of nickel, gold-plated, or silver gives an aesthetic appearance,
  • The surface of neodymium magnets generates a unique magnetic field – this is a key feature,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to the potential of free molding and customization to unique needs, magnetic components can be modeled in a variety of forms and dimensions, which amplifies use scope,
  • Universal use in advanced technology sectors – they are utilized in hard drives, electric motors, medical equipment, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems

Disadvantages

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength 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
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating nuts and complicated shapes in magnets, we propose using cover - magnetic holder.
  • Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process 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 lifting capacity of the magnet – what contributes to it?

Holding force of 1.88 kg is a result of laboratory testing executed under the following configuration:
  • on a block made of mild steel, effectively closing the magnetic field
  • whose transverse dimension reaches at least 10 mm
  • characterized by even structure
  • with total lack of distance (no coatings)
  • under perpendicular application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

Lifting capacity in real conditions – factors

During everyday use, the real power results from several key aspects, listed from most significant:
  • Gap between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – the best choice is pure iron steel. Cast iron may attract less.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Warnings
Warning for allergy sufferers

Certain individuals suffer from a sensitization to nickel, which is the common plating for NdFeB magnets. Frequent touching might lead to skin redness. We suggest wear protective gloves.

This is not a toy

Neodymium magnets are not toys. Swallowing a few magnets may result in them pinching intestinal walls, which poses a critical condition and requires immediate surgery.

Protect data

Do not bring magnets near a wallet, laptop, or screen. The magnetism can destroy these devices and wipe information from cards.

Conscious usage

Before use, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Demagnetization risk

Avoid heat. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, ask us about HT versions (H, SH, UH).

Precision electronics

Remember: rare earth magnets generate a field that confuses precision electronics. Keep a safe distance from your mobile, tablet, and GPS.

Crushing force

Big blocks can crush fingers instantly. Under no circumstances place your hand betwixt two attracting surfaces.

Material brittleness

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Pacemakers

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Fire risk

Powder created during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.

Warning! More info about risks in the article: Safety of working with magnets.