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UMC 42x7/4x9 / N38 - cylindrical magnetic holder

cylindrical magnetic holder

Catalog no 320411

GTIN/EAN: 5906301814672

Diameter

42 mm [±1 mm]

internal diameter Ø

7/4 mm [±1 mm]

Height

9 mm [±1 mm]

Weight

72 g

Magnetization Direction

↑ axial

Load capacity

32.00 kg / 313.81 N

Coating

[NiCuNi] Nickel

check technical specifications »

29.99 ZŁ with VAT / pcs + price for transport

24.38 ZŁ net + 23% VAT / pcs

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Strength and appearance of magnets can be tested with our force calculator.

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Detailed specification - UMC 42x7/4x9 / N38 - cylindrical magnetic holder

Specification / characteristics - UMC 42x7/4x9 / N38 - cylindrical magnetic holder

properties
properties values
Cat. no. 320411
GTIN/EAN 5906301814672
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 42 mm [±1 mm]
internal diameter Ø 7/4 mm [±1 mm]
Height 9 mm [±1 mm]
Weight 72 g
Magnetization Direction ↑ axial
Load capacity ~ ? 32.00 kg / 313.81 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMC 42x7/4x9 / 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%
Sustainability
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: 320411-2026
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Magnetic Induction
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These are magnets in the shape of a rod in a brass or steel sleeve, ideal for embedding in deep sockets. Thanks to side shielding, they do not "catch" the walls of the mounting hole, which facilitates installation.
These holders usually have an internal thread (blind or through) on the back wall. 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. This is a key feature when mounting in steel sockets so the magnet doesn't "stick" to the hole walls during insertion.
The neodymium magnet is deeply embedded (glued) in a solid block of steel or brass, making it very resistant. Thanks to the solid build, the holder withstands repeated impacts and shocks during work cycles.
We recommend making the mounting hole with slight clearance and using glue for certainty. If high precision is required, measure the specific batch with a caliper before machining sockets.

Pros and cons of Nd2Fe14B magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:
  • They have stable power, and over more than 10 years their performance decreases symbolically – ~1% (according to theory),
  • They retain their magnetic properties even under external field action,
  • A magnet with a metallic nickel surface has better aesthetics,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to freedom in designing and the capacity to customize to individual projects,
  • Fundamental importance in advanced technology sectors – they serve a role in magnetic memories, electromotive mechanisms, medical devices, as well as industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Cons

What to avoid - cons of neodymium magnets: application proposals
  • At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing threads and complicated forms in magnets, we recommend using casing - magnetic mount.
  • Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these devices can complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Holding force characteristics

Maximum holding power of the magnet – what contributes to it?

The specified lifting capacity represents the peak performance, measured under optimal environment, namely:
  • with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • with a thickness of at least 10 mm
  • characterized by smoothness
  • with total lack of distance (no coatings)
  • for force applied at a right angle (in the magnet axis)
  • at temperature room level

Lifting capacity in real conditions – factors

Holding efficiency is affected by specific conditions, mainly (from most important):
  • Distance – existence of any layer (rust, dirt, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 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.
  • Plate thickness – too thin sheet causes magnetic saturation, causing part of the flux to be wasted into the air.
  • Steel type – mild steel attracts best. Higher carbon content reduce magnetic permeability and lifting capacity.
  • Surface finish – full contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Temperature – heating the magnet results in weakening of induction. Check the thermal limit for a given model.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.

Warnings
Caution required

Handle with care. Neodymium magnets attract from a distance and snap with huge force, often quicker than you can react.

Metal Allergy

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If redness occurs, cease working with magnets and wear gloves.

Fragile material

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

GPS and phone interference

Remember: neodymium magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your phone, device, and navigation systems.

Data carriers

Powerful magnetic fields can erase data on credit cards, hard drives, and storage devices. Stay away of min. 10 cm.

Medical implants

People with a ICD have to keep an safe separation from magnets. The magnetism can interfere with the operation of the implant.

Dust is flammable

Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Demagnetization risk

Regular neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.

Swallowing risk

Adult use only. Small elements pose a choking risk, leading to severe trauma. Store out of reach of children and animals.

Serious injuries

Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

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