Neodymiums – complete shape selection

Need strong magnetic field? We have in stock wide selection of various shapes and sizes. They are ideal for home use, garage and model making. Check our offer available immediately.

check price list and dimensions

Magnets for seabed exploration

Start your adventure related to seabed exploration! Our specialized grips (F200, F400) provide grip certainty and huge lifting capacity. Solid, corrosion-resistant housing and reinforced ropes will perform in rivers and lakes.

choose your set

Magnetic solutions for business

Professional solutions for fixing non-invasive. Threaded grips (M8, M10, M12) guarantee instant organization of work on warehouses. They are indispensable installing lighting, detectors and ads.

see available threads

📦 Fast shipping: buy by 14:00, package goes out today!

Dhit sp. z o.o.
Product available Ships tomorrow

MP 5x1.5x3 / N38 - ring magnet

ring magnet

Catalog no 030451

GTIN/EAN: 5906301812357

5.00

Diameter

5 mm [±0,1 mm]

internal diameter Ø

1.5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

0.4 g

Magnetization Direction

↑ axial

Load capacity

0.77 kg / 7.50 N

Magnetic Induction

475.16 mT / 4752 Gs

Coating

[NiCuNi] Nickel

0.344 with VAT / pcs + price for transport

0.280 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
0.280 ZŁ
0.344 ZŁ
price from 2200 pcs
0.263 ZŁ
0.324 ZŁ
price from 9000 pcs
0.246 ZŁ
0.303 ZŁ
Can't decide what to choose?

Contact us by phone +48 22 499 98 98 or let us know through inquiry form the contact section.
Lifting power and structure of a neodymium magnet can be calculated using our force calculator.

Orders submitted before 14:00 will be dispatched today!

Technical specification of the product - MP 5x1.5x3 / N38 - ring magnet

Specification / characteristics - MP 5x1.5x3 / N38 - ring magnet

properties
properties values
Cat. no. 030451
GTIN/EAN 5906301812357
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 5 mm [±0,1 mm]
internal diameter Ø 1.5 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 0.4 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.77 kg / 7.50 N
Magnetic Induction ~ ? 475.16 mT / 4752 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 5x1.5x3 / 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

Engineering modeling of the assembly - report

The following values constitute the outcome of a engineering analysis. Values were calculated on algorithms for the material Nd2Fe14B. Operational conditions might slightly differ. Please consider these data as a reference point when designing systems.

Table 1: Static pull force (force vs distance) - interaction chart
MP 5x1.5x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6157 Gs
615.7 mT
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
safe
1 mm 3880 Gs
388.0 mT
0.31 kg / 0.67 pounds
305.8 g / 3.0 N
safe
2 mm 2310 Gs
231.0 mT
0.11 kg / 0.24 pounds
108.4 g / 1.1 N
safe
3 mm 1422 Gs
142.2 mT
0.04 kg / 0.09 pounds
41.0 g / 0.4 N
safe
5 mm 641 Gs
64.1 mT
0.01 kg / 0.02 pounds
8.3 g / 0.1 N
safe
10 mm 174 Gs
17.4 mT
0.00 kg / 0.00 pounds
0.6 g / 0.0 N
safe
15 mm 76 Gs
7.6 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
safe
20 mm 41 Gs
4.1 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
30 mm 16 Gs
1.6 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
50 mm 5 Gs
0.5 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

Table 2: Shear hold (vertical surface)
MP 5x1.5x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.15 kg / 0.34 pounds
154.0 g / 1.5 N
1 mm Stal (~0.2) 0.06 kg / 0.14 pounds
62.0 g / 0.6 N
2 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
3 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 5x1.5x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.23 kg / 0.51 pounds
231.0 g / 2.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.15 kg / 0.34 pounds
154.0 g / 1.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.08 kg / 0.17 pounds
77.0 g / 0.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.39 kg / 0.85 pounds
385.0 g / 3.8 N

Table 4: Material efficiency (saturation) - sheet metal selection
MP 5x1.5x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.08 kg / 0.17 pounds
77.0 g / 0.8 N
1 mm
25%
0.19 kg / 0.42 pounds
192.5 g / 1.9 N
2 mm
50%
0.39 kg / 0.85 pounds
385.0 g / 3.8 N
3 mm
75%
0.58 kg / 1.27 pounds
577.5 g / 5.7 N
5 mm
100%
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
10 mm
100%
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
11 mm
100%
0.77 kg / 1.70 pounds
770.0 g / 7.6 N
12 mm
100%
0.77 kg / 1.70 pounds
770.0 g / 7.6 N

Table 5: Working in heat (stability) - thermal limit
MP 5x1.5x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.77 kg / 1.70 pounds
770.0 g / 7.6 N
OK
40 °C -2.2% 0.75 kg / 1.66 pounds
753.1 g / 7.4 N
OK
60 °C -4.4% 0.74 kg / 1.62 pounds
736.1 g / 7.2 N
OK
80 °C -6.6% 0.72 kg / 1.59 pounds
719.2 g / 7.1 N
100 °C -28.8% 0.55 kg / 1.21 pounds
548.2 g / 5.4 N

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 5x1.5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.50 kg / 5.50 pounds
6 171 Gs
0.37 kg / 0.83 pounds
374 g / 3.7 N
N/A
1 mm 1.62 kg / 3.58 pounds
9 932 Gs
0.24 kg / 0.54 pounds
244 g / 2.4 N
1.46 kg / 3.22 pounds
~0 Gs
2 mm 0.99 kg / 2.19 pounds
7 760 Gs
0.15 kg / 0.33 pounds
149 g / 1.5 N
0.89 kg / 1.97 pounds
~0 Gs
3 mm 0.59 kg / 1.30 pounds
5 986 Gs
0.09 kg / 0.20 pounds
88 g / 0.9 N
0.53 kg / 1.17 pounds
~0 Gs
5 mm 0.21 kg / 0.47 pounds
3 600 Gs
0.03 kg / 0.07 pounds
32 g / 0.3 N
0.19 kg / 0.42 pounds
~0 Gs
10 mm 0.03 kg / 0.06 pounds
1 281 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
0.02 kg / 0.05 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
349 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
50 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
33 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
23 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
17 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
13 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
10 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Safety (HSE) (electronics) - warnings
MP 5x1.5x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Timepiece 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 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

Table 8: Collisions (kinetic energy) - collision effects
MP 5x1.5x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 44.27 km/h
(12.30 m/s)
0.03 J
30 mm 76.64 km/h
(21.29 m/s)
0.09 J
50 mm 98.94 km/h
(27.48 m/s)
0.15 J
100 mm 139.93 km/h
(38.87 m/s)
0.30 J

Table 9: Anti-corrosion coating durability
MP 5x1.5x3 / 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)

Table 10: Construction data (Pc)
MP 5x1.5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 811 Mx 8.1 µWb
Pc Coefficient 1.66 High (Stable)

Table 11: Underwater work (magnet fishing)
MP 5x1.5x3 / N38

Environment Effective steel pull Effect
Air (land) 0.77 kg Standard
Water (riverbed) 0.88 kg
(+0.11 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Sliding resistance

*Note: On a vertical wall, the magnet holds just approx. 20-30% of its nominal pull.

2. Steel saturation

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

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.66

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.

Engineering data and GPSR
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%
Environmental data
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: 030451-2026
Measurement Calculator
Force (pull)

Magnetic Induction

Other proposals

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 easy screwing 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. 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 inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 1.5 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 Ø5 mm (outer diameter) and height 3 mm. The pulling force of this model is an impressive 0.77 kg, which translates to 7.50 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 1.5 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.

Strengths and weaknesses of neodymium magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:
  • They retain attractive force for nearly ten years – the drop is just ~1% (based on simulations),
  • They are extremely resistant to demagnetization induced by external disturbances,
  • The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to look better,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of custom forming as well as adjusting to atypical requirements,
  • Wide application in innovative solutions – they serve a role in data components, electric motors, diagnostic systems, as well as other advanced devices.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also raises their 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
  • 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 and corrosion.
  • We suggest a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex forms.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets can complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Pull force analysis

Maximum holding power of the magnet – what affects it?

Holding force of 0.77 kg is a theoretical maximum value performed under the following configuration:
  • using a base made of low-carbon steel, acting as a ideal flux conductor
  • whose thickness is min. 10 mm
  • with a surface cleaned and smooth
  • with total lack of distance (without impurities)
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature room level

Determinants of lifting force in real conditions

Bear in mind that the application force may be lower depending on elements below, in order of importance:
  • Clearance – the presence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Steel grade – ideal substrate is pure iron steel. Hardened steels may attract less.
  • Smoothness – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Temperature influence – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, however under shearing force the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate lowers the load capacity.

Safe handling of neodymium magnets
Precision electronics

GPS units and smartphones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.

Combustion hazard

Powder produced during machining of magnets is combustible. Do not drill into magnets unless you are an expert.

Conscious usage

Handle magnets consciously. Their huge power can shock even experienced users. Stay alert and respect their power.

Data carriers

Device Safety: Strong magnets can ruin payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Magnets are brittle

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

Skin irritation risks

A percentage of the population experience a contact allergy to Ni, which is the standard coating for neodymium magnets. Prolonged contact can result in an allergic reaction. We suggest wear protective gloves.

Product not for children

Only for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from kids and pets.

Thermal limits

Avoid heat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Implant safety

People with a pacemaker should maintain an safe separation from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Finger safety

Danger of trauma: The pulling power is so immense that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.

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

e-mail: bok@dhit.pl

tel: +48 888 99 98 98