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

cylindrical magnetic holder

Catalog no 320407

GTIN/EAN: 5906301814634

5.00
Load capacity 6.00 kg / 58.84 N
Diameter
20 mm [±1 mm]
internal diameter Ø
6/3 mm [±1 mm]
Height
7 mm [±1 mm]
Weight
12 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

view technical data »

5.68 zł net / pcs

6.99 zł with VAT (23% VAT) / pcs

price for transport

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price from 100 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 specification of the product - 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
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

Material specification

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: 320407-2026
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Cylindrical holders (Type B) distinguish themselves with a large body height, which allows for deep mounting. 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. It is a precise, durable solution enabling depth adjustment.
The construction causes the magnetic flux to short-circuit inside, making the sides practically non-magnetic. It enables precise point action without side interference.
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.
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 rare earth magnets.

Pros

Apart from their superior magnetic energy, neodymium magnets have these key benefits:
  • They have constant strength, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Neodymium magnets create maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to the ability of flexible forming and customization to individualized solutions, NdFeB magnets can be produced in a broad palette of forms and dimensions, which amplifies use scope,
  • Wide application in future technologies – they are used in magnetic memories, drive modules, diagnostic systems, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in small systems

Weaknesses

Characteristics of disadvantages of neodymium magnets: application proposals
  • At strong impacts they can break, therefore we recommend 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 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 - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Possible danger related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these products can complicate diagnosis medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Magnet power was defined for the most favorable conditions, taking into account:
  • using a plate made of mild steel, serving as a magnetic yoke
  • possessing a thickness of min. 10 mm to avoid saturation
  • characterized by smoothness
  • under conditions of ideal adhesion (metal-to-metal)
  • during detachment in a direction vertical to the plane
  • in stable room temperature

Determinants of practical lifting force of a magnet

Effective lifting capacity is influenced by specific conditions, mainly (from priority):
  • Distance – the presence of foreign body (rust, tape, air) acts as an insulator, which reduces capacity 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.
  • Plate thickness – insufficiently thick plate causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Chemical composition of the base – mild steel attracts best. Higher carbon content reduce magnetic permeability and lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
  • Temperature – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet and the plate reduces the load capacity.

Precautions when working with neodymium magnets
Life threat

Warning for patients: Strong magnetic fields disrupt medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Choking Hazard

Only for adults. Tiny parts pose a choking risk, causing serious injuries. Keep away from children and animals.

Heat warning

Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. Damage is permanent.

Flammability

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

Cards and drives

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

Serious injuries

Protect your hands. Two large magnets will join immediately with a force of massive weight, destroying everything in their path. Be careful!

Material brittleness

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets leads to them cracking into small pieces.

Threat to navigation

Remember: rare earth magnets generate a field that interferes with sensitive sensors. Keep a separation from your phone, device, and navigation systems.

Warning for allergy sufferers

Allergy Notice: The nickel-copper-nickel coating contains nickel. If an allergic reaction appears, cease working with magnets and use protective gear.

Handling rules

Be careful. Neodymium magnets attract from a distance and snap with massive power, often quicker than you can move away.

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