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UMC 25x6/4x8 / N38 - cylindrical magnetic holder

cylindrical magnetic holder

Catalog no 320408

GTIN/EAN: 5906301814641

Load capacity 14.00 kg / 137.29 N
Diameter
25 mm [±1 mm]
internal diameter Ø
6/4 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
21 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

see technical specifications »

9.51 zł net / pcs

11.70 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

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Quantity
Net
Gross
price from 1 pcs
9.51 zł
11.70 zł
price from 50 pcs
8.94 zł
11.00 zł
price from 100 pcs
8.37 zł
10.29 zł

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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Product card - UMC 25x6/4x8 / N38 - cylindrical magnetic holder

Specification / characteristics - UMC 25x6/4x8 / N38 - cylindrical magnetic holder

properties
properties values
Cat. no. 320408
GTIN/EAN 5906301814641
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 25 mm [±1 mm]
internal diameter Ø 6/4 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 21 g
Magnetization Direction ↑ axial
Load capacity ~ ? 14.00 kg / 137.29 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMC 25x6/4x8 / 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 specification and ecology

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: 320408-2026
Measurement Calculator

Force (pull)

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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.
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.
All magnet energy is directed exclusively to the front (active surface), increasing point force. 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. Thanks to the solid build, the holder withstands repeated impacts and shocks during work cycles.
These holders are produced with standard tolerance for industrial magnets (usually ±0.1 mm or h6). If high precision is required, measure the specific batch with a caliper before machining sockets.

Strengths as well as weaknesses of neodymium magnets.

Pros

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • Their strength is durable, and after around ten years it drops only by ~1% (according to research),
  • They have excellent resistance to magnetic field loss due to external fields,
  • A magnet with a smooth silver surface is more attractive,
  • Magnetic induction on the working part of the magnet is impressive,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of precise forming as well as adjusting to atypical applications,
  • Huge importance in advanced technology sectors – they are commonly used in mass storage devices, electric motors, precision medical tools, also industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages

Problematic aspects of neodymium magnets: application proposals
  • At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • We suggest casing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • With mass production the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum holding power of the magnet – what affects it?

Information about lifting capacity was defined for optimal configuration, assuming:
  • on a base made of mild steel, effectively closing the magnetic field
  • with a thickness no less than 10 mm
  • characterized by lack of roughness
  • with total lack of distance (without paint)
  • during pulling in a direction vertical to the plane
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

Holding efficiency impacted by working environment parameters, including (from priority):
  • Gap (between the magnet and the metal), as even a very small clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was determined using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet’s surface and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Keep away from computers

Avoid bringing magnets near a purse, laptop, or TV. The magnetism can permanently damage these devices and erase data from cards.

Heat warning

Do not overheat. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Pinching danger

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, crushing anything in their path. Be careful!

Do not underestimate power

Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Medical interference

For implant holders: Powerful magnets affect electronics. Keep minimum 30 cm distance or ask another person to handle the magnets.

Nickel allergy

Nickel alert: The Ni-Cu-Ni coating contains nickel. If skin irritation happens, cease handling magnets and use protective gear.

Machining danger

Machining of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Precision electronics

A strong magnetic field disrupts the operation of magnetometers in phones and navigation systems. Maintain magnets close to a device to avoid breaking the sensors.

Eye protection

NdFeB magnets are sintered ceramics, which means they are fragile like glass. Collision of two magnets will cause them shattering into shards.

Keep away from children

Always keep magnets away from children. Choking hazard is significant, and the consequences of magnets clamping inside the body are fatal.

Security! Need more info? Check our post: Are neodymium magnets dangerous?