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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

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29.99 ZŁ with VAT / pcs + price for transport

24.38 ZŁ net + 23% VAT / pcs

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Technical specification of the product - 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 specification and ecology
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: 320411-2026
Measurement Calculator
Pulling force
Magnetic Induction
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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.
It can also be glued or pressed (maintaining tolerance) into a prepared hole. 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.
The steel housing provides excellent mechanical protection for the brittle magnet against impacts. 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. It is an industrial product, not a precise machine element, although the execution is careful.

Advantages and disadvantages of rare earth magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They retain attractive force for nearly 10 years – the loss is just ~1% (based on simulations),
  • Magnets very well protect themselves against demagnetization caused by ambient magnetic noise,
  • A magnet with a shiny nickel surface has better aesthetics,
  • Magnets exhibit excellent magnetic induction on the outer side,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of accurate modeling as well as adapting to specific conditions,
  • Significant place in modern industrial fields – they are commonly used in data components, electromotive mechanisms, precision medical tools, also modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • We suggest cover - magnetic holder, due to difficulties in producing nuts inside the magnet and complicated forms.
  • Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these magnets are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum magnetic pulling force – what it depends on?

The lifting capacity listed is a theoretical maximum value executed under standard conditions:
  • with the application of a sheet made of special test steel, ensuring maximum field concentration
  • with a cross-section minimum 10 mm
  • with an polished touching surface
  • without any insulating layer between the magnet and steel
  • under perpendicular application of breakaway force (90-degree angle)
  • at standard ambient temperature

Determinants of practical lifting force of a magnet

In practice, the real power depends on several key aspects, listed from most significant:
  • Clearance – existence of any layer (rust, dirt, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Angle of force application – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Steel grade – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
  • Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet and the plate reduces the holding force.

Safety rules for work with NdFeB magnets
Skin irritation risks

Some people have a sensitization to nickel, which is the standard coating for neodymium magnets. Frequent touching might lead to an allergic reaction. We recommend use protective gloves.

Protect data

Powerful magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Flammability

Powder created during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Medical interference

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

Fragile material

NdFeB magnets are sintered ceramics, which means they are fragile like glass. Impact of two magnets leads to them shattering into shards.

Precision electronics

A powerful magnetic field negatively affects the functioning of magnetometers in phones and GPS navigation. Maintain magnets near a smartphone to avoid breaking the sensors.

Safe operation

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Hand protection

Mind your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Be careful!

Heat warning

Standard neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Adults only

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

Important! Learn more about hazards in the article: Safety of working with magnets.