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UMC 20x6/3x7 / N38 - cylindrical magnetic holder

cylindrical magnetic holder

Catalog no 320407

GTIN/EAN: 5906301814634

5.00

Diameter

20 mm [±1 mm]

internal diameter Ø

6/3 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

12 g

Magnetization Direction

↑ axial

Load capacity

6.00 kg / 58.84 N

Coating

[NiCuNi] Nickel

view properties »

6.99 ZŁ with VAT / pcs + price for transport

5.68 ZŁ net + 23% VAT / pcs

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Technical data - UMC 20x6/3x7 / N38 - cylindrical magnetic holder

Specification / characteristics - UMC 20x6/3x7 / N38 - cylindrical magnetic holder

properties
properties values
Cat. no. 320407
GTIN/EAN 5906301814634
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 20 mm [±1 mm]
internal diameter Ø 6/3 mm [±1 mm]
Height 7 mm [±1 mm]
Weight 12 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.00 kg / 58.84 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMC 20x6/3x7 / N38 - cylindrical magnetic holder
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 and environmental data
Elemental analysis
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: 320407-2026
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Cylindrical holders (Type B) distinguish themselves with a large body height, which allows for deep mounting. They are used in positioning elements, injection molds, dies, and automation.
It can also be glued or pressed (maintaining tolerance) into a prepared hole. The mounting thread allows for stable and secure fixing in a machine or jig.
The construction causes the magnetic flux to short-circuit inside, making the sides practically non-magnetic. It increases attraction force in the magnet axis and facilitates assembly in ferromagnetic blocks.
The steel housing provides excellent mechanical protection for the brittle magnet against impacts. The risk of magnet cracking with normal use is minimal as it is shielded.
These holders are produced with standard tolerance for industrial magnets (usually ±0.1 mm or h6). For mounting certainty and centering, gluing or screw fastening from the back is used.

Advantages and disadvantages of rare earth magnets.

Benefits

Apart from their superior magnetism, neodymium magnets have these key benefits:
  • They do not lose strength, even over nearly ten years – the decrease in strength is only ~1% (according to tests),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • By using a shiny coating of gold, the element presents an elegant look,
  • Magnets are characterized by very high magnetic induction on the outer side,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures reaching 230°C and above...
  • Thanks to freedom in designing and the capacity to customize to individual projects,
  • Wide application in future technologies – they are utilized in HDD drives, electric motors, diagnostic systems, as well as industrial machines.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages

What to avoid - cons of neodymium magnets: tips and applications.
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited ability of making nuts in the magnet and complex shapes - preferred is cover - magnet mounting.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small components 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 increases costs of application in large quantities

Holding force characteristics

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

The force parameter is a result of laboratory testing executed under standard conditions:
  • using a base made of mild steel, functioning as a ideal flux conductor
  • possessing a thickness of at least 10 mm to avoid saturation
  • with an ground touching surface
  • under conditions of ideal adhesion (metal-to-metal)
  • during detachment in a direction vertical to the plane
  • in neutral thermal conditions

Determinants of lifting force in real conditions

It is worth knowing that the application force will differ depending on elements below, starting with the most relevant:
  • Distance – existence of foreign body (paint, dirt, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
  • Thermal environment – temperature increase causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the holding force.

H&S for magnets
Avoid contact if allergic

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, immediately stop working with magnets and use protective gear.

Operating temperature

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

Medical interference

Warning for patients: Powerful magnets affect electronics. Maintain minimum 30 cm distance or request help to work with the magnets.

Do not give to children

Neodymium magnets are not toys. Swallowing several magnets may result in them attracting across intestines, which constitutes a critical condition and requires immediate surgery.

Risk of cracking

Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Pinching danger

Danger of trauma: The pulling power is so great that it can result in hematomas, pinching, and broken bones. Use thick gloves.

Mechanical processing

Machining of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Protect data

Device Safety: Neodymium magnets can damage data carriers and delicate electronics (heart implants, hearing aids, timepieces).

Magnetic interference

Navigation devices and smartphones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.

Immense force

Exercise caution. Rare earth magnets attract from a distance and snap with massive power, often faster than you can move away.

Warning! Details about risks in the article: Safety of working with magnets.