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UMC 75x11/6x18 / N38 - cylindrical magnetic holder

cylindrical magnetic holder

Catalog no 320414

GTIN/EAN: 5906301814702

5.00

Diameter

75 mm [±1 mm]

internal diameter Ø

11/6 mm [±1 mm]

Height

18 mm [±1 mm]

Weight

465 g

Load capacity

155.00 kg / 1520.03 N

Coating

[NiCuNi] Nickel

check properties »

169.86 ZŁ with VAT / pcs + price for transport

138.10 ZŁ net + 23% VAT / pcs

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Lifting power as well as shape of a neodymium magnet can be verified using our magnetic calculator.

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Technical - UMC 75x11/6x18 / N38 - cylindrical magnetic holder

Specification / characteristics - UMC 75x11/6x18 / N38 - cylindrical magnetic holder

properties
properties values
Cat. no. 320414
GTIN/EAN 5906301814702
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 75 mm [±1 mm]
internal diameter Ø 11/6 mm [±1 mm]
Height 18 mm [±1 mm]
Weight 465 g
Load capacity ~ ? 155.00 kg / 1520.03 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMC 75x11/6x18 / 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
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: 320414-2026
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Force (pull)
Field Strength
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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 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.
These holders are produced with standard tolerance for industrial magnets (usually ±0.1 mm or h6). It is an industrial product, not a precise machine element, although the execution is careful.

Strengths as well as weaknesses of neodymium magnets.

Pros

Apart from their strong holding force, neodymium magnets have these key benefits:
  • Their strength remains stable, and after around ten years it drops only by ~1% (theoretically),
  • They are resistant to demagnetization induced by presence of other magnetic fields,
  • A magnet with a metallic nickel surface looks better,
  • They feature high magnetic induction at the operating surface, which affects their effectiveness,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Due to the potential of accurate shaping and customization to custom requirements, magnetic components can be created in a wide range of shapes and sizes, which expands the range of possible applications,
  • Versatile presence in modern industrial fields – they are commonly used in computer drives, brushless drives, medical equipment, also industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also raises their 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 extremely resistant to heat
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complex shapes.
  • Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Maximum lifting capacity of the magnet – what affects it?

The force parameter is a theoretical maximum value conducted under specific, ideal conditions:
  • using a sheet made of mild steel, functioning as a magnetic yoke
  • whose thickness equals approx. 10 mm
  • with a plane perfectly flat
  • under conditions of ideal adhesion (surface-to-surface)
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

Effective lifting capacity is affected by working environment parameters, including (from priority):
  • Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Direction of force – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Metal type – not every steel reacts the same. High carbon content weaken the attraction effect.
  • Base smoothness – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, whereas under shearing force the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with neodymium magnets
Warning for allergy sufferers

A percentage of the population experience a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Extended handling may cause skin redness. We suggest use protective gloves.

Beware of splinters

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

Do not give to children

Always keep magnets out of reach of children. Ingestion danger is high, and the consequences of magnets connecting inside the body are fatal.

GPS and phone interference

An intense magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Keep magnets near a device to avoid breaking the sensors.

Medical implants

Warning for patients: Powerful magnets affect medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Mechanical processing

Drilling and cutting of NdFeB material poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Caution required

Handle magnets consciously. Their powerful strength can surprise even experienced users. Plan your moves and do not underestimate their force.

Keep away from computers

Data protection: Strong magnets can ruin data carriers and delicate electronics (pacemakers, hearing aids, mechanical watches).

Do not overheat magnets

Keep cool. Neodymium magnets are sensitive to heat. If you need operation above 80°C, look for HT versions (H, SH, UH).

Serious injuries

Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

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