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MP 30x7/3x3 / N38 - ring magnet

ring magnet

Catalog no 030250

GTIN/EAN: 5906301812265

5.00
Load capacity 3.64 kg / 35.69 N Magnetic Induction 121.58 mT / 1216 Gs
Diameter
30 mm [±0,1 mm]
internal diameter Ø
7/3 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
15.75 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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5.56 zł net / pcs

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Frequently asked questions

What is the hole in a ring magnet for?
For mounting on a screw or a shaft. The bore may be cylindrical or countersunk for a screw head. The hole removes magnet volume, so a ring holds less than a disc of the same outside diameter.
What is the polarisation?
Axial as standard — poles on the flat faces of the ring. Diametrical polarisation is made to order.
What sizes are available?
Outside diameter from 5 to 62 mm from stock. To order up to 200 mm outside diameter, 180 mm bore and 40 mm height, with a lead time of 25–35 days.

Guides from the knowledge base

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.

PDF report Calculator
Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical parameters - MP 30x7/3x3 / N38 - ring magnet

Specification / characteristics - MP 30x7/3x3 / N38 - ring magnet

properties
properties values
Cat. no. 030250
GTIN/EAN 5906301812265
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 30 mm [±0,1 mm]
internal diameter Ø 7/3 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 15.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 3.64 kg / 35.69 N
Magnetic Induction ~ ? 121.58 mT / 1216 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 30x7/3x3 / N38 - ring magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 modeling of the assembly - data

Presented values represent the outcome of a mathematical analysis. Values are based on algorithms for the class Nd2Fe14B. Operational performance may deviate from the simulation results. Use these calculations as a reference point when designing systems.

Table 1: Static force (force vs gap) - power drop
MP 30x7/3x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1039 Gs
103.9 mT
 3.64 kg / 8.02 lbs
3640.0 g / 35.7 N
 strong
1 mm 1015 Gs
101.5 mT
 3.48 kg / 7.67 lbs
3477.6 g / 34.1 N
 strong
2 mm 980 Gs
98.0 mT
 3.24 kg / 7.14 lbs
3240.7 g / 31.8 N
 strong
3 mm 936 Gs
93.6 mT
 2.95 kg / 6.51 lbs
2951.6 g / 29.0 N
 strong
5 mm 827 Gs
82.7 mT
 2.31 kg / 5.08 lbs
2305.8 g / 22.6 N
 strong
10 mm 539 Gs
53.9 mT
 0.98 kg / 2.16 lbs
981.0 g / 9.6 N
 low risk
15 mm 329 Gs
32.9 mT
 0.37 kg / 0.80 lbs
365.1 g / 3.6 N
 low risk
20 mm 202 Gs
20.2 mT
 0.14 kg / 0.30 lbs
137.9 g / 1.4 N
 low risk
30 mm 85 Gs
8.5 mT
 0.02 kg / 0.05 lbs
24.6 g / 0.2 N
 low risk
50 mm 23 Gs
2.3 mT
 0.00 kg / 0.00 lbs
1.8 g / 0.0 N
 low risk
Magnetic force decreases sharply per each millimeter of gap. Keep in mind that even a microscopic distance (e.g., contamination, paint, dust) significantly reduces the pull force. Magnetic products hold most effectively at the point of direct contact; gap nullifies the power. Notice how quickly the load capacity fall, when the product does not touch tightly to the steel surface. When planning the mounting, avoid additional spacers.

Table 2: Sliding hold (vertical surface)
MP 30x7/3x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.73 kg / 1.60 lbs
728.0 g / 7.1 N
1 mm Stal (~0.2) 0.70 kg / 1.53 lbs
696.0 g / 6.8 N
2 mm Stal (~0.2) 0.65 kg / 1.43 lbs
648.0 g / 6.4 N
3 mm Stal (~0.2) 0.59 kg / 1.30 lbs
590.0 g / 5.8 N
5 mm Stal (~0.2) 0.46 kg / 1.02 lbs
462.0 g / 4.5 N
10 mm Stal (~0.2) 0.20 kg / 0.43 lbs
196.0 g / 1.9 N
15 mm Stal (~0.2) 0.07 kg / 0.16 lbs
74.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 lbs
28.0 g / 0.3 N
30 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The following data calculates the approximate shear load sufficient to cause the shifting of the magnet vertically against a upright steel wall (considering standard friction coefficient). This value depends on the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MP 30x7/3x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.09 kg / 2.41 lbs
1092.0 g / 10.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.73 kg / 1.60 lbs
728.0 g / 7.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.36 kg / 0.80 lbs
364.0 g / 3.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.82 kg / 4.01 lbs
1820.0 g / 17.9 N
When placing a magnet on a upright plane (e.g., a board), it will only hold just about 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient cause that holders move down faster than they pop off the substrate. Planning a hanger? Note that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the element will slide down under a significantly smaller weight. Using a rubber pad can significantly improve the result.

Table 4: Steel thickness (saturation) - power losses
MP 30x7/3x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.36 kg / 0.80 lbs
364.0 g / 3.6 N
1 mm
25%
 0.91 kg / 2.01 lbs
910.0 g / 8.9 N
2 mm
50%
 1.82 kg / 4.01 lbs
1820.0 g / 17.9 N
3 mm
75%
 2.73 kg / 6.02 lbs
2730.0 g / 26.8 N
5 mm
100%
 3.64 kg / 8.02 lbs
3640.0 g / 35.7 N
10 mm
100%
 3.64 kg / 8.02 lbs
3640.0 g / 35.7 N
11 mm
100%
 3.64 kg / 8.02 lbs
3640.0 g / 35.7 N
12 mm
100%
 3.64 kg / 8.02 lbs
3640.0 g / 35.7 N
A too thin steel is not enough to conduct the entire magnetic field, which wastes potential of the magnet. If you install a neodymium to a too thin substrate, the magnetism will penetrate right through and the pull force will drop sharply. To achieve 100% of this neodymium's potential, you need a suitably thick element of metal. The saturation effect means that on sheet metal structures (e.g., car bodies), the magnet holds weaker. We recommend selecting the steel dimension according to the table below.

Table 5: Thermal stability (stability) - resistance threshold
MP 30x7/3x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 3.64 kg / 8.02 lbs
3640.0 g / 35.7 N
 OK
40 °C -2.2% 3.56 kg / 7.85 lbs
3559.9 g / 34.9 N
 OK
60 °C -4.4% 3.48 kg / 7.67 lbs
3479.8 g / 34.1 N
80 °C -6.6% 3.40 kg / 7.50 lbs
3399.8 g / 33.4 N
100 °C -28.8% 2.59 kg / 5.71 lbs
2591.7 g / 25.4 N
Ordinary NdFeB products lose parameters after exceeding the maximum temperature. Watch out for overheating – heat can permanently demagnetize this product. As the temperature rises, the neodymium's power momentarily decreases. Do not use this product close to ovens higher than its operating temperature limit. Exceeding the critical threshold will result in destruction of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) may lose charge permanently at lower temperatures than taller cylinders. Red status in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 30x7/3x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.96 kg / 8.73 lbs
1 995 Gs
0.59 kg / 1.31 lbs
594 g / 5.8 N
 N/A
1 mm 3.88 kg / 8.56 lbs
2 058 Gs
0.58 kg / 1.28 lbs
582 g / 5.7 N
 3.49 kg / 7.70 lbs
~0 Gs
2 mm 3.78 kg / 8.34 lbs
2 031 Gs
0.57 kg / 1.25 lbs
567 g / 5.6 N
 3.40 kg / 7.50 lbs
~0 Gs
3 mm 3.66 kg / 8.07 lbs
1 998 Gs
0.55 kg / 1.21 lbs
549 g / 5.4 N
 3.30 kg / 7.26 lbs
~0 Gs
5 mm 3.37 kg / 7.43 lbs
1 918 Gs
0.51 kg / 1.12 lbs
506 g / 5.0 N
 3.04 kg / 6.69 lbs
~0 Gs
10 mm 2.51 kg / 5.53 lbs
1 654 Gs
0.38 kg / 0.83 lbs
376 g / 3.7 N
 2.26 kg / 4.97 lbs
~0 Gs
20 mm 1.07 kg / 2.35 lbs
1 079 Gs
0.16 kg / 0.35 lbs
160 g / 1.6 N
 0.96 kg / 2.12 lbs
~0 Gs
50 mm 0.06 kg / 0.13 lbs
258 Gs
0.01 kg / 0.02 lbs
9 g / 0.1 N
 0.05 kg / 0.12 lbs
~0 Gs
60 mm 0.03 kg / 0.06 lbs
171 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
70 mm 0.01 kg / 0.03 lbs
118 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
80 mm 0.01 kg / 0.01 lbs
84 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.01 lbs
62 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 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
Two magnetic products interact from a wider radius than a neodymium and metal setup. The setup of two magnets generates a stronger field and a further horizon of performance. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the collision energy is huge. The repulsion force is a bit weaker than the connection force, but still significant.
*The magnetic induction in repulsion mode drops to ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
* Calculations show sliding force of two matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - precautionary measures
MP 30x7/3x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.0 cm
Hearing aid 10 Gs (1.0 mT) 7.0 cm
Timepiece 20 Gs (2.0 mT) 5.5 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Remote 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field poses a real danger to electronics as well as medical implants. These magnets produce a field that disrupts operation of sensitive medical devices. Be aware: the unseen radiation penetrates the body and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MP 30x7/3x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.36 km/h
(5.38 m/s)
 0.23 J
30 mm 21.31 km/h
(5.92 m/s)
 0.28 J
50 mm 21.37 km/h
(5.94 m/s)
 0.28 J
100 mm 21.38 km/h
(5.94 m/s)
 0.28 J
NdFeB products are delicate – a strong collision with metal risks their cracking. Watch the impact speed – a neodymium left loose turns into a projectile. Impact energy can trigger coating fragments or injury to fingers. Always hold the magnet during installation so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear safety glasses when playing with large magnets.

Table 9: Coating parameters (durability)
MP 30x7/3x3 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MP 30x7/3x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 8 395 Mx 84.0 µWb
Pc Coefficient 0.13 Low (Flat)
Flux value emitted by the magnet pole. Key data in coil applications and motors. Pc value determines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 30x7/3x3 / N38

Environment Effective steel pull Effect
Air (land) 3.64 kg Standard
Water (riverbed) 4.17 kg
(+0.53 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!
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.

1. Wall mount (shear)

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

2. Steel saturation

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

3. Thermal stability

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.13

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 specification and ecology

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: 030250-2026
Measurement Calculator

Force (pull)

Magnetic Induction

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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 is a crucial issue when working with model MP 30x7/3x3 / 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. 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 easily scratched when tightening the screw, which will become a corrosion focus. 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 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. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø30 mm (outer diameter) and height 3 mm. The key parameter here is the lifting capacity amounting to approximately 3.64 kg (force ~35.69 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 7/3 mm.
The poles are located on the planes with holes, not on the sides of the ring. 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.

Advantages and disadvantages of rare earth magnets.

Strengths

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • They retain attractive force for nearly 10 years – the drop is just ~1% (based on simulations),
  • Neodymium magnets are exceptionally resistant to magnetic field loss caused by magnetic disturbances,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnets are characterized by huge magnetic induction on the outer side,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
  • Possibility of custom shaping as well as optimizing to precise needs,
  • Key role in innovative solutions – they are commonly used in data components, electromotive mechanisms, medical equipment, and modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to 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.
  • Limited ability of producing nuts in the magnet and complicated forms - preferred is casing - magnet mounting.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small elements of these products can disrupt the diagnostic process medical after entering the body.
  • Due to complex production process, their price exceeds standard values,

Holding force characteristics

Best holding force of the magnet in ideal parameters – what affects it?

Holding force of 3.64 kg is a theoretical maximum value executed under the following configuration:
  • using a plate made of low-carbon steel, functioning as a magnetic yoke
  • whose thickness reaches at least 10 mm
  • with a surface cleaned and smooth
  • with direct contact (no paint)
  • for force acting at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

During everyday use, the actual holding force results from a number of factors, listed from crucial:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Material composition – different alloys reacts the same. Alloy additives weaken the attraction effect.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
  • Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, in contrast under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate decreases the holding force.

H&S for magnets
Crushing risk

Big blocks can smash fingers instantly. Under no circumstances place your hand betwixt two strong magnets.

Warning for heart patients

Individuals with a heart stimulator have to keep an safe separation from magnets. The magnetism can disrupt the operation of the implant.

Fire risk

Fire hazard: Neodymium dust is explosive. Avoid machining magnets without safety gear as this risks ignition.

Material brittleness

Beware of splinters. Magnets can explode upon violent connection, ejecting shards into the air. Wear goggles.

Heat warning

Regular neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

Cards and drives

Data protection: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, medical aids, timepieces).

Do not underestimate power

Use magnets with awareness. Their huge power can surprise even experienced users. Plan your moves and do not underestimate their force.

Precision electronics

A powerful magnetic field negatively affects the operation of compasses in phones and GPS navigation. Maintain magnets close to a smartphone to avoid damaging the sensors.

Skin irritation risks

Studies show that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, avoid direct skin contact and choose encased magnets.

Product not for children

Product intended for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Store away from kids and pets.

Danger! Learn more about risks in the article: Safety of working with magnets.