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neodymium magnets

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NC NeoCube fi 5 mm kuleczki kolorowe / N38 - neocube

neocube

Catalog no 120229

GTIN: 5906301812685

5

Weight

145 g

Magnetization Direction

↑ axial

Coating

[NiCuNi] nickel

49.99 with VAT / pcs + price for transport

40.64 ZŁ net + 23% VAT / pcs

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NC NeoCube fi 5 mm kuleczki kolorowe / N38 - neocube
Specification/characteristics NC NeoCube fi 5 mm kuleczki kolorowe / N38 - neocube
properties
values
Cat. no.
120229
GTIN
5906301812685
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Weight
145 g [±0,1 mm]
Magnetization Direction
↑ axial
Coating
[NiCuNi] nickel
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N38

properties
values
units
remenance Br [Min. - Max.] ?
12.2-12.6
kGs
remenance Br [Min. - Max.] ?
1220-1260
T
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

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 106
°C-1
Thermal expansion perpendicular (⊥) to orientation (M)
-(1-3) x 10-6
°C-1
Young's modulus
1.7 x 104
kg/mm²

Shopping tips

It is a magnetic puzzle allowing for building solids, chains, and jewelry. Arranging balls acts relaxingly, destresses, and improves concentration. A great desk gadget that occupies hands while thinking.
The product is dedicated to teenagers and adults, it must be absolutely kept away from children. In case of swallowing, magnets can attract through intestinal walls, which requires immediate surgical intervention. It is an office and logic gadget, not a traditional toy.
With intensive use, the coating of balls (especially colorful ones) may undergo natural wear. The most durable are balls in nickel (silver) color, as it is a hard galvanic coating. Coating wear does not affect the magnetic force of the balls.
You can buy more boxes to build increasingly larger and more complicated solids. It is important to combine balls of the same diameter (standard is 5 mm). More balls mean more fun and a bigger challenge.
The best method to organize balls is to form them into a long chain. When you have a chain, you can fold it into strips of 6 balls, and then into a rectangle. Beginnings can be difficult, but the satisfaction from a perfectly arranged cube is immense.

Strengths and weaknesses of NdFeB magnets.

Apart from their strong magnetic energy, neodymium magnets have these key benefits:

  • They have stable power, and over around 10 years their performance decreases symbolically – ~1% (in testing),
  • Magnets perfectly defend themselves against loss of magnetization caused by external fields,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Neodymium magnets achieve maximum magnetic induction on a small surface, which ensures high operational effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in shaping and the capacity to modify to complex applications,
  • Fundamental importance in modern industrial fields – they find application in computer drives, brushless drives, medical equipment, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in miniature devices

Cons of neodymium magnets and ways of using them

  • To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures 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 nuts in the magnet and complex shapes - preferred is a housing - mounting mechanism.
  • Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Highest magnetic holding forcewhat it depends on?

The force parameter is a measurement result executed under standard conditions:

  • using a sheet made of mild steel, serving as a circuit closing element
  • possessing a thickness of min. 10 mm to avoid saturation
  • characterized by smoothness
  • under conditions of gap-free contact (surface-to-surface)
  • under perpendicular force vector (90-degree angle)
  • at temperature room level

Determinants of lifting force in real conditions

It is worth knowing that the application force will differ subject to the following factors, starting with the most relevant:

  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Load vector – highest force is obtained only during perpendicular pulling. The shear force of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be lost into the air.
  • Material composition – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Smoothness – full contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed with the use of a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the holding force is lower. Additionally, even a slight gap {between} the magnet and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets

Magnets are brittle

Despite the nickel coating, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Impact on smartphones

GPS units and mobile phones are extremely sensitive to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Handling guide

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

Demagnetization risk

Standard neodymium magnets (grade N) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Bone fractures

Big blocks can break fingers instantly. Under no circumstances put your hand betwixt two strong magnets.

Danger to pacemakers

People with a heart stimulator should maintain an large gap from magnets. The magnetism can stop the functioning of the life-saving device.

Dust explosion hazard

Drilling and cutting of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Adults only

Neodymium magnets are not toys. Swallowing multiple magnets may result in them connecting inside the digestive tract, which constitutes a direct threat to life and requires urgent medical intervention.

Nickel coating and allergies

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation appears, immediately stop working with magnets and use protective gear.

Threat to electronics

Avoid bringing magnets near a wallet, laptop, or screen. The magnetism can destroy these devices and wipe information from cards.

Important!

Need more info? Read our article: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98