Powerful neodymium magnets: discs and cylinders

Want to buy really powerful magnets? Our range includes rich assortment of various shapes and sizes. Best choice for home use, garage and model making. Browse assortment available immediately.

see price list and dimensions

Magnet fishing: strong F200/F400 sets

Discover your passion involving underwater treasure hunting! Our double-handle grips (F200, F400) provide safety guarantee and huge lifting capacity. Stainless steel construction and reinforced ropes are reliable in challenging water conditions.

find your water magnet

Magnetic solutions for business

Reliable solutions for mounting non-invasive. Threaded mounts (M8, M10, M12) provide quick improvement of work on production halls. Perfect for installing lighting, sensors and ads.

see available threads

🚀 Lightning processing: orders by 14:00 shipped within 24h!

Dhit sp. z o.o.
Product available Ships today (order by 14:00)

MP 5x2.7/1.2x5 Z / N38 - ring magnet

ring magnet

Catalog no 030203

GTIN/EAN: 5906301812203

5.00

Diameter

5 mm [±0,1 mm]

internal diameter Ø

2.7/1.2 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

0.69 g

Magnetization Direction

↑ axial

Load capacity

0.75 kg / 7.31 N

Magnetic Induction

553.14 mT / 5531 Gs

Coating

[NiCuNi] Nickel

0.836 with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
0.680 ZŁ
0.836 ZŁ
price from 900 pcs
0.639 ZŁ
0.786 ZŁ
price from 3700 pcs
0.598 ZŁ
0.736 ZŁ
Not sure about your choice?

Call us +48 22 499 98 98 otherwise get in touch via request form through our site.
Lifting power and structure of magnetic components can be reviewed with our power calculator.

Orders submitted before 14:00 will be dispatched today!

Technical details - MP 5x2.7/1.2x5 Z / N38 - ring magnet

Specification / characteristics - MP 5x2.7/1.2x5 Z / N38 - ring magnet

properties
properties values
Cat. no. 030203
GTIN/EAN 5906301812203
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 2.7/1.2 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 0.69 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.75 kg / 7.31 N
Magnetic Induction ~ ? 553.14 mT / 5531 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 5x2.7/1.2x5 Z / 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 analysis of the assembly - data

These data are the direct effect of a mathematical analysis. Results were calculated on models for the material Nd2Fe14B. Real-world parameters might slightly differ. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static force (force vs gap) - characteristics
MP 5x2.7/1.2x5 Z / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5322 Gs
532.2 mT
0.75 kg / 1.65 pounds
750.0 g / 7.4 N
safe
1 mm 3295 Gs
329.5 mT
0.29 kg / 0.63 pounds
287.5 g / 2.8 N
safe
2 mm 1883 Gs
188.3 mT
0.09 kg / 0.21 pounds
93.9 g / 0.9 N
safe
3 mm 1098 Gs
109.8 mT
0.03 kg / 0.07 pounds
31.9 g / 0.3 N
safe
5 mm 440 Gs
44.0 mT
0.01 kg / 0.01 pounds
5.1 g / 0.1 N
safe
10 mm 92 Gs
9.2 mT
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
safe
15 mm 33 Gs
3.3 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
20 mm 15 Gs
1.5 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
30 mm 5 Gs
0.5 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
50 mm 1 Gs
0.1 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

Table 2: Vertical capacity (vertical surface)
MP 5x2.7/1.2x5 Z / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.15 kg / 0.33 pounds
150.0 g / 1.5 N
1 mm Stal (~0.2) 0.06 kg / 0.13 pounds
58.0 g / 0.6 N
2 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
3 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 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 (shearing) - vertical pull
MP 5x2.7/1.2x5 Z / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.22 kg / 0.50 pounds
225.0 g / 2.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.15 kg / 0.33 pounds
150.0 g / 1.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.08 kg / 0.17 pounds
75.0 g / 0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.38 kg / 0.83 pounds
375.0 g / 3.7 N

Table 4: Material efficiency (substrate influence) - power losses
MP 5x2.7/1.2x5 Z / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.08 kg / 0.17 pounds
75.0 g / 0.7 N
1 mm
25%
0.19 kg / 0.41 pounds
187.5 g / 1.8 N
2 mm
50%
0.38 kg / 0.83 pounds
375.0 g / 3.7 N
3 mm
75%
0.56 kg / 1.24 pounds
562.5 g / 5.5 N
5 mm
100%
0.75 kg / 1.65 pounds
750.0 g / 7.4 N
10 mm
100%
0.75 kg / 1.65 pounds
750.0 g / 7.4 N
11 mm
100%
0.75 kg / 1.65 pounds
750.0 g / 7.4 N
12 mm
100%
0.75 kg / 1.65 pounds
750.0 g / 7.4 N

Table 5: Working in heat (material behavior) - resistance threshold
MP 5x2.7/1.2x5 Z / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.75 kg / 1.65 pounds
750.0 g / 7.4 N
OK
40 °C -2.2% 0.73 kg / 1.62 pounds
733.5 g / 7.2 N
OK
60 °C -4.4% 0.72 kg / 1.58 pounds
717.0 g / 7.0 N
OK
80 °C -6.6% 0.70 kg / 1.54 pounds
700.5 g / 6.9 N
100 °C -28.8% 0.53 kg / 1.18 pounds
534.0 g / 5.2 N

Table 6: Two magnets (repulsion) - forces in the system
MP 5x2.7/1.2x5 Z / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.75 kg / 6.06 pounds
5 924 Gs
0.41 kg / 0.91 pounds
412 g / 4.0 N
N/A
1 mm 1.77 kg / 3.90 pounds
8 541 Gs
0.27 kg / 0.58 pounds
265 g / 2.6 N
1.59 kg / 3.51 pounds
~0 Gs
2 mm 1.05 kg / 2.32 pounds
6 590 Gs
0.16 kg / 0.35 pounds
158 g / 1.5 N
0.95 kg / 2.09 pounds
~0 Gs
3 mm 0.60 kg / 1.33 pounds
4 992 Gs
0.09 kg / 0.20 pounds
91 g / 0.9 N
0.54 kg / 1.20 pounds
~0 Gs
5 mm 0.20 kg / 0.44 pounds
2 860 Gs
0.03 kg / 0.07 pounds
30 g / 0.3 N
0.18 kg / 0.39 pounds
~0 Gs
10 mm 0.02 kg / 0.04 pounds
880 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
0.02 kg / 0.04 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
184 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
16 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
10 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
6 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
4 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
3 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
2 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Hazards (implants) - warnings
MP 5x2.7/1.2x5 Z / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.0 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Mechanical watch 20 Gs (2.0 mT) 2.0 cm
Mobile device 40 Gs (4.0 mT) 1.5 cm
Remote 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm

Table 8: Collisions (cracking risk) - collision effects
MP 5x2.7/1.2x5 Z / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 33.26 km/h
(9.24 m/s)
0.03 J
30 mm 57.59 km/h
(16.00 m/s)
0.09 J
50 mm 74.35 km/h
(20.65 m/s)
0.15 J
100 mm 105.14 km/h
(29.21 m/s)
0.29 J

Table 9: Corrosion resistance
MP 5x2.7/1.2x5 Z / 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 (Flux)
MP 5x2.7/1.2x5 Z / N38

Parameter Value SI Unit / Description
Magnetic Flux 862 Mx 8.6 µWb
Pc Coefficient 0.83 High (Stable)

Table 11: Physics of underwater searching
MP 5x2.7/1.2x5 Z / N38

Environment Effective steel pull Effect
Air (land) 0.75 kg Standard
Water (riverbed) 0.86 kg
(+0.11 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. Sliding resistance

*Caution: On a vertical surface, the magnet holds merely ~20% of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. computer case) drastically limits 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) = 0.83

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%
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: 030203-2026
Quick Unit Converter
Force (pull)

Magnetic Induction

See also offers

The ring-shaped magnet MP 5x2.7/1.2x5 Z / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. This product with a force of 0.75 kg works great as a door latch, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 5x2.7/1.2x5 Z / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable 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. 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.
A screw or bolt with a thread diameter smaller than 2.7/1.2 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.
It is a magnetic ring with a diameter of 5 mm and thickness 5 mm. The pulling force of this model is an impressive 0.75 kg, which translates to 7.31 N in newtons. The mounting hole diameter is precisely 2.7/1.2 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.

Pros as well as cons of Nd2Fe14B magnets.

Pros

Apart from their strong magnetic energy, neodymium magnets have these key benefits:
  • They do not lose magnetism, even over nearly 10 years – the reduction in power is only ~1% (based on measurements),
  • Neodymium magnets remain extremely resistant to demagnetization caused by external magnetic fields,
  • In other words, due to the aesthetic surface of silver, the element gains visual value,
  • The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
  • Possibility of custom creating as well as optimizing to concrete applications,
  • Huge importance in modern technologies – they are used in hard drives, electromotive mechanisms, advanced medical instruments, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in compact constructions

Disadvantages

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of making threads in the magnet and complicated forms - preferred is casing - magnetic holder.
  • Health risk to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child safety. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Pull force analysis

Maximum lifting capacity of the magnetwhat affects it?

Breakaway force was defined for ideal contact conditions, including:
  • using a base made of high-permeability steel, functioning as a magnetic yoke
  • with a thickness minimum 10 mm
  • with a plane cleaned and smooth
  • without any clearance between the magnet and steel
  • during detachment in a direction vertical to the plane
  • at conditions approx. 20°C

Impact of factors on magnetic holding capacity in practice

Holding efficiency is influenced by working environment parameters, including (from most important):
  • Gap between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Steel grade – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet and the plate lowers the lifting capacity.

Precautions when working with neodymium magnets
Caution required

Before use, check safety instructions. Sudden snapping can break the magnet or injure your hand. Be predictive.

Power loss in heat

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. Damage is permanent.

Product not for children

Product intended for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep out of reach of kids and pets.

Pinching danger

Pinching hazard: The pulling power is so immense that it can cause blood blisters, crushing, and broken bones. Protective gloves are recommended.

Keep away from electronics

Be aware: rare earth magnets generate a field that interferes with precision electronics. Keep a separation from your mobile, tablet, and GPS.

Risk of cracking

Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Nickel allergy

It is widely known that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, avoid direct skin contact and choose versions in plastic housing.

Keep away from computers

Device Safety: Strong magnets can damage payment cards and sensitive devices (pacemakers, hearing aids, mechanical watches).

Health Danger

Life threat: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Fire warning

Fire hazard: Rare earth powder is highly flammable. Do not process magnets without safety gear as this risks ignition.

Caution! Looking for details? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98