Neodymium magnets: strength you're looking for

Looking for huge power in small size? Our range includes rich assortment of disc, cylindrical and ring magnets. Best choice for home use, garage and industrial tasks. See products in stock.

see magnet catalog

Magnet fishing sets (searchers)

Begin your hobby involving underwater treasure hunting! Our double-handle grips (F200, F400) provide safety guarantee and huge lifting capacity. Stainless steel construction and strong lines will perform in challenging water conditions.

choose searching equipment

Magnetic mounts for industry

Professional solutions for mounting non-invasive. Threaded grips (M8, M10, M12) provide quick improvement of work on production halls. They are indispensable installing lighting, sensors and banners.

see industrial applications

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

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

MP 8x6/3.5x3 / N38 - ring magnet

ring magnet

Catalog no 030206

GTIN/EAN: 5906301812234

5.00

Diameter

8 mm [±0,1 mm]

internal diameter Ø

6/3.5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

0.91 g

Magnetization Direction

↑ axial

Load capacity

1.37 kg / 13.48 N

Magnetic Induction

371.53 mT / 3715 Gs

Coating

[NiCuNi] Nickel

0.701 with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
0.570 ZŁ
0.701 ZŁ
price from 1100 pcs
0.536 ZŁ
0.659 ZŁ
price from 4400 pcs
0.502 ZŁ
0.617 ZŁ
Can't decide what to choose?

Call us now +48 22 499 98 98 if you prefer drop us a message by means of inquiry form our website.
Force as well as appearance of magnets can be verified with our power calculator.

Orders placed before 14:00 will be shipped the same business day.

Physical properties - MP 8x6/3.5x3 / N38 - ring magnet

Specification / characteristics - MP 8x6/3.5x3 / N38 - ring magnet

properties
properties values
Cat. no. 030206
GTIN/EAN 5906301812234
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 8 mm [±0,1 mm]
internal diameter Ø 6/3.5 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 0.91 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.37 kg / 13.48 N
Magnetic Induction ~ ? 371.53 mT / 3715 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 8x6/3.5x3 / 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 simulation of the product - technical parameters

These values constitute the direct effect of a mathematical simulation. Values are based on algorithms for the class Nd2Fe14B. Operational performance may differ from theoretical values. Treat these data as a reference point when designing systems.

Table 1: Static force (pull vs distance) - interaction chart
MP 8x6/3.5x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3327 Gs
332.7 mT
1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
safe
1 mm 2612 Gs
261.2 mT
0.84 kg / 1.86 pounds
844.4 g / 8.3 N
safe
2 mm 1884 Gs
188.4 mT
0.44 kg / 0.97 pounds
439.3 g / 4.3 N
safe
3 mm 1310 Gs
131.0 mT
0.21 kg / 0.47 pounds
212.4 g / 2.1 N
safe
5 mm 637 Gs
63.7 mT
0.05 kg / 0.11 pounds
50.3 g / 0.5 N
safe
10 mm 151 Gs
15.1 mT
0.00 kg / 0.01 pounds
2.8 g / 0.0 N
safe
15 mm 54 Gs
5.4 mT
0.00 kg / 0.00 pounds
0.4 g / 0.0 N
safe
20 mm 25 Gs
2.5 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
safe
30 mm 8 Gs
0.8 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
50 mm 2 Gs
0.2 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

Table 2: Sliding load (vertical surface)
MP 8x6/3.5x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.27 kg / 0.60 pounds
274.0 g / 2.7 N
1 mm Stal (~0.2) 0.17 kg / 0.37 pounds
168.0 g / 1.6 N
2 mm Stal (~0.2) 0.09 kg / 0.19 pounds
88.0 g / 0.9 N
3 mm Stal (~0.2) 0.04 kg / 0.09 pounds
42.0 g / 0.4 N
5 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 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: Wall mounting (sliding) - vertical pull
MP 8x6/3.5x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.41 kg / 0.91 pounds
411.0 g / 4.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.27 kg / 0.60 pounds
274.0 g / 2.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.14 kg / 0.30 pounds
137.0 g / 1.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.69 kg / 1.51 pounds
685.0 g / 6.7 N

Table 4: Material efficiency (saturation) - power losses
MP 8x6/3.5x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.14 kg / 0.30 pounds
137.0 g / 1.3 N
1 mm
25%
0.34 kg / 0.76 pounds
342.5 g / 3.4 N
2 mm
50%
0.69 kg / 1.51 pounds
685.0 g / 6.7 N
3 mm
75%
1.03 kg / 2.27 pounds
1027.5 g / 10.1 N
5 mm
100%
1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
10 mm
100%
1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
11 mm
100%
1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
12 mm
100%
1.37 kg / 3.02 pounds
1370.0 g / 13.4 N

Table 5: Thermal resistance (stability) - power drop
MP 8x6/3.5x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.37 kg / 3.02 pounds
1370.0 g / 13.4 N
OK
40 °C -2.2% 1.34 kg / 2.95 pounds
1339.9 g / 13.1 N
OK
60 °C -4.4% 1.31 kg / 2.89 pounds
1309.7 g / 12.8 N
80 °C -6.6% 1.28 kg / 2.82 pounds
1279.6 g / 12.6 N
100 °C -28.8% 0.98 kg / 2.15 pounds
975.4 g / 9.6 N

Table 6: Two magnets (attraction) - field collision
MP 8x6/3.5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.36 kg / 5.20 pounds
4 867 Gs
0.35 kg / 0.78 pounds
354 g / 3.5 N
N/A
1 mm 1.90 kg / 4.20 pounds
5 981 Gs
0.29 kg / 0.63 pounds
286 g / 2.8 N
1.71 kg / 3.78 pounds
~0 Gs
2 mm 1.45 kg / 3.20 pounds
5 223 Gs
0.22 kg / 0.48 pounds
218 g / 2.1 N
1.31 kg / 2.88 pounds
~0 Gs
3 mm 1.06 kg / 2.34 pounds
4 468 Gs
0.16 kg / 0.35 pounds
159 g / 1.6 N
0.96 kg / 2.11 pounds
~0 Gs
5 mm 0.53 kg / 1.16 pounds
3 148 Gs
0.08 kg / 0.17 pounds
79 g / 0.8 N
0.47 kg / 1.05 pounds
~0 Gs
10 mm 0.09 kg / 0.19 pounds
1 274 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
0.08 kg / 0.17 pounds
~0 Gs
20 mm 0.00 kg / 0.01 pounds
301 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
27 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
16 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
10 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
7 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
5 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
4 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Protective zones (implants) - precautionary measures
MP 8x6/3.5x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.0 cm
Hearing aid 10 Gs (1.0 mT) 3.0 cm
Timepiece 20 Gs (2.0 mT) 2.5 cm
Mobile device 40 Gs (4.0 mT) 2.0 cm
Car key 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: Impact energy (kinetic energy) - collision effects
MP 8x6/3.5x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 39.18 km/h
(10.88 m/s)
0.05 J
30 mm 67.78 km/h
(18.83 m/s)
0.16 J
50 mm 87.50 km/h
(24.31 m/s)
0.27 J
100 mm 123.74 km/h
(34.37 m/s)
0.54 J

Table 9: Surface protection spec
MP 8x6/3.5x3 / 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)

Table 10: Electrical data (Flux)
MP 8x6/3.5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 299 Mx 13.0 µWb
Pc Coefficient 0.46 Low (Flat)

Table 11: Submerged application
MP 8x6/3.5x3 / N38

Environment Effective steel pull Effect
Air (land) 1.37 kg Standard
Water (riverbed) 1.57 kg
(+0.20 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

*Warning: On a vertical surface, the magnet retains merely ~20% of its max power.

2. Steel thickness impact

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

3. Thermal stability

*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) = 0.46

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.

Technical specification and ecology
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: 030206-2026
Quick Unit Converter
Pulling force

Magnetic Induction

View more proposals

The ring magnet with a hole MP 8x6/3.5x3 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. 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. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure 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.
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 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 6/3.5 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 (8 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø8 mm (outer diameter) and height 3 mm. The key parameter here is the holding force amounting to approximately 1.37 kg (force ~13.48 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 6/3.5 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.

Strengths and weaknesses of neodymium magnets.

Benefits

Besides their immense magnetic power, neodymium magnets offer the following advantages:
  • They retain magnetic properties for almost 10 years – the loss is just ~1% (according to analyses),
  • Neodymium magnets are exceptionally resistant to loss of magnetic properties caused by magnetic disturbances,
  • The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to look better,
  • The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of exact modeling and adjusting to defined needs,
  • Versatile presence in high-tech industry – they are used in computer drives, motor assemblies, advanced medical instruments, also industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in miniature devices

Disadvantages

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong 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 suffer a drop in strength. Often, when the temperature exceeds 80°C, their power 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
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Limited ability of creating threads in the magnet and complicated shapes - recommended is cover - magnet mounting.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these devices can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Optimal lifting capacity of a neodymium magnetwhat it depends on?

Holding force of 1.37 kg is a theoretical maximum value executed under specific, ideal conditions:
  • with the contact of a yoke made of low-carbon steel, ensuring maximum field concentration
  • with a cross-section of at least 10 mm
  • with an ground contact surface
  • under conditions of ideal adhesion (metal-to-metal)
  • under vertical application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

Determinants of practical lifting force of a magnet

Bear in mind that the application force may be lower depending on the following factors, starting with the most relevant:
  • Clearance – the presence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Steel thickness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be wasted to the other side.
  • Steel type – low-carbon steel gives the best results. Alloy admixtures decrease magnetic properties and lifting capacity.
  • Smoothness – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was measured by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets
Fire warning

Fire warning: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.

Hand protection

Danger of trauma: The attraction force is so immense that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Handling guide

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

Precision electronics

Navigation devices and mobile phones are highly sensitive to magnetism. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Allergic reactions

Studies show that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, avoid touching magnets with bare hands or choose versions in plastic housing.

Data carriers

Avoid bringing magnets close to a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Protective goggles

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.

Do not overheat magnets

Keep cool. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Implant safety

Life threat: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Danger to the youngest

These products are not intended for children. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates immediate surgery.

Attention! Need more info? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98