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UMC 32x11/3x8 / N38 - cylindrical magnetic holder

cylindrical magnetic holder

Catalog no 320409

GTIN/EAN: 5906301814658

5.00
Load capacity 23.00 kg / 225.55 N
Diameter
32 mm [±1 mm]
internal diameter Ø
11/3 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
36 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

see parameters »

14.62 zł net / pcs

17.98 zł with VAT (23% VAT) / pcs

price for transport

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price from 30 pcs
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Frequently asked questions

How much will a magnetic holder hold in practice?
The catalogue value assumes full contact with smooth steel at least 10 mm thick and a perpendicular pull. Thinner sheet, paint, rust and surface irregularities reduce it considerably: on 1 mm sheet about half remains. Lifting and vertical mounting call for an additional safety margin.
Will a holder work on stainless steel?
Not on austenitic grades 304 and 316 — they are effectively non-magnetic. It will not work on aluminium, copper or brass either. Those materials need a mechanical gripper.
Which coating for which conditions?
Nickel-copper-nickel (NiCuNi) is the standard and covers most applications. Epoxy is used for damp environments and outdoor work, zinc is sufficient for dry interiors. Holders in a steel housing or in rubber also protect the magnet against impact.

Guides from the knowledge base

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical details - UMC 32x11/3x8 / N38 - cylindrical magnetic holder

Specification / characteristics - UMC 32x11/3x8 / N38 - cylindrical magnetic holder

properties
properties values
Cat. no. 320409
GTIN/EAN 5906301814658
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 32 mm [±1 mm]
internal diameter Ø 11/3 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 36 g
Magnetization Direction ↑ axial
Load capacity ~ ? 23.00 kg / 225.55 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMC 32x11/3x8 / N38 - cylindrical magnetic holder
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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: 320409-2026
Measurement Calculator

Force (pull)

Field Strength

Enter data in any box, and all other values change on the fly.

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Cylindrical holders (Type B) distinguish themselves with a large body height, which allows for deep mounting. Used where the magnet must be hidden deep in the material or precisely positioned.
Mounting is done by screwing with a bolt from the back of the device or machine. 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. The risk of magnet cracking with normal use is minimal as it is shielded.
Dimensions may vary slightly, so they are not always H7 fitted elements without machining. For mounting certainty and centering, gluing or screw fastening from the back is used.

Strengths and weaknesses of Nd2Fe14B magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their strength remains stable, and after around ten years it decreases only by ~1% (according to research),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • In other words, due to the shiny surface of silver, the element is aesthetically pleasing,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in designing and the ability to modify to unusual requirements,
  • Huge importance in advanced technology sectors – they find application in HDD drives, drive modules, medical equipment, also modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Limited ability of producing threads in the magnet and complicated shapes - recommended is cover - magnet mounting.
  • Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these products can be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Magnetic strength at its maximum – what affects it?

Holding force of 23.00 kg is a measurement result executed under specific, ideal conditions:
  • on a block made of structural steel, perfectly concentrating the magnetic flux
  • whose transverse dimension equals approx. 10 mm
  • with an ground touching surface
  • without the slightest clearance between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Holding efficiency impacted by working environment parameters, such as (from priority):
  • Distance – the presence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Plate material – mild steel attracts best. Alloy steels decrease magnetic permeability and lifting capacity.
  • Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under shearing force the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets
Powerful field

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

Sensitization to coating

Some people experience a hypersensitivity to nickel, which is the common plating for neodymium magnets. Prolonged contact may cause skin redness. It is best to wear safety gloves.

Health Danger

Individuals with a ICD should keep an large gap from magnets. The magnetism can disrupt the functioning of the life-saving device.

Threat to navigation

GPS units and mobile phones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Heat sensitivity

Do not overheat. Neodymium magnets are susceptible to heat. If you require operation above 80°C, look for HT versions (H, SH, UH).

This is not a toy

Always store magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are tragic.

Serious injuries

Big blocks can crush fingers instantly. Under no circumstances put your hand betwixt two attracting surfaces.

Protective goggles

Protect your eyes. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Mechanical processing

Dust generated during cutting of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Cards and drives

Do not bring magnets close to a purse, computer, or screen. The magnetism can permanently damage these devices and wipe information from cards.

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