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UMC 16x5/2x5 / N38 - cylindrical magnetic holder

cylindrical magnetic holder

Catalog no 320406

GTIN/EAN: 5906301814627

5.00
Load capacity 4.00 kg / 39.23 N
Diameter
16 mm [±1 mm]
internal diameter Ø
5/2 mm [±1 mm]
Height
5 mm [±1 mm]
Weight
5.5 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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2.71 zł net / pcs

3.33 zł with VAT (23% VAT) / 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 data of the product - UMC 16x5/2x5 / N38 - cylindrical magnetic holder

Specification / characteristics - UMC 16x5/2x5 / N38 - cylindrical magnetic holder

properties
properties values
Cat. no. 320406
GTIN/EAN 5906301814627
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 16 mm [±1 mm]
internal diameter Ø 5/2 mm [±1 mm]
Height 5 mm [±1 mm]
Weight 5.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.00 kg / 39.23 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMC 16x5/2x5 / 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
Engineering data and GPSR

Chemical composition

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%

Ecology and recycling (GPSR)

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: 320406-2026
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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. It is a precise, durable solution enabling depth adjustment.
The thick, steel or brass housing (sleeve) effectively screens the magnetic field on the sides of the holder. This is a key feature when mounting in steel sockets so the magnet doesn't "stick" to the hole walls during insertion.
It is one of the most durable types of holders, resistant to crushing. 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 as well as cons of rare earth magnets.

Strengths

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
  • They have stable power, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to freedom in designing and the ability to modify to individual projects,
  • Fundamental importance in advanced technology sectors – they serve a role in hard drives, electromotive mechanisms, diagnostic systems, and complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in miniature devices

Cons

Cons of neodymium magnets and ways of using them
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its 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.
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in creating nuts and complicated forms in magnets, we propose using casing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Holding force characteristics

Magnetic strength at its maximum – what affects it?

The specified lifting capacity refers to the limit force, measured under optimal environment, namely:
  • with the use of a yoke made of low-carbon steel, ensuring maximum field concentration
  • whose transverse dimension is min. 10 mm
  • with a surface cleaned and smooth
  • without any clearance between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at temperature room level

What influences lifting capacity in practice

Holding efficiency is influenced by working environment parameters, including (from most important):
  • Gap (between the magnet and the plate), as even a very small distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Steel grade – ideal substrate is pure iron steel. Hardened steels may generate lower lifting capacity.
  • Surface finish – full contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Safe handling of NdFeB magnets
Keep away from computers

Equipment safety: Neodymium magnets can damage payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).

Safe operation

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

Permanent damage

Monitor thermal conditions. Exposing the magnet to high heat will ruin its magnetic structure and strength.

Warning for heart patients

For implant holders: Powerful magnets affect electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Magnets are brittle

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Nickel coating and allergies

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If an allergic reaction appears, cease working with magnets and wear gloves.

Fire warning

Powder generated during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Bodily injuries

Large magnets can crush fingers in a fraction of a second. Do not place your hand between two strong magnets.

Swallowing risk

Product intended for adults. Small elements pose a choking risk, causing intestinal necrosis. Keep out of reach of kids and pets.

Threat to navigation

A strong magnetic field disrupts the operation of magnetometers in smartphones and GPS navigation. Do not bring magnets close to a smartphone to avoid damaging the sensors.

Safety First! Looking for details? Read our article: Are neodymium magnets dangerous?