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HH 42x8.8 [M6] / N38 - through hole magnetic holder

through hole magnetic holder

Catalog no 370484

GTIN/EAN: 5906301814948

Diameter Ø

42 mm [±1 mm]

Height

8.8 mm [±1 mm]

Weight

75.2 g

Magnetization Direction

↑ axial

Load capacity

55.00 kg / 539.37 N

Coating

[NiCuNi] Nickel

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29.89 ZŁ with VAT / pcs + price for transport

24.30 ZŁ net + 23% VAT / pcs

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Product card - HH 42x8.8 [M6] / N38 - through hole magnetic holder

Specification / characteristics - HH 42x8.8 [M6] / N38 - through hole magnetic holder

properties
properties values
Cat. no. 370484
GTIN/EAN 5906301814948
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 Ø 42 mm [±1 mm]
Height 8.8 mm [±1 mm]
Weight 75.2 g
Magnetization Direction ↑ axial
Load capacity ~ ? 55.00 kg / 539.37 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics HH 42x8.8 [M6] / N38 - through hole 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
Engineering data and GPSR
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: 370484-2026
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Magnet pull force
Field Strength
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A through-hole holder is a flat neodymium magnet placed in a steel cup with a mounting hole. They are used as bumpers, door stops, flap holders, and mounting elements in machines.
The magnet inside is brittle, so we advise against using impact drivers. It is worth using a washer if the screw head is small to distribute pressure.
Model HH 42x8.8 [M6] / N38 has a holding force of approx. 55.00 kg on thick steel. It is a very efficient solution of small thickness, ensuring high power.
They serve as a base for holding metal elements, e.g., doors, flaps, covers, or tools. Thanks to flat construction, they do not take up much space and are discreet.
The steel housing and magnet are covered with an anti-corrosion layer (nickel, zinc, or chrome). For outdoor applications, we recommend additional protection with varnish or choosing a rubberized version.

Pros and cons of rare earth magnets.

Advantages

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They retain magnetic properties for nearly 10 years – the drop is just ~1% (according to analyses),
  • Magnets perfectly resist against demagnetization caused by ambient magnetic noise,
  • Thanks to the shimmering finish, the surface of Ni-Cu-Ni, gold, or silver gives an modern appearance,
  • The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Due to the possibility of accurate shaping and customization to specialized needs, NdFeB magnets can be created in a broad palette of geometric configurations, which increases their versatility,
  • Fundamental importance in high-tech industry – they are commonly used in computer drives, motor assemblies, precision medical tools, also industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in compact constructions

Disadvantages

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest 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
  • Due to limitations in creating nuts and complicated forms in magnets, we recommend using a housing - magnetic mechanism.
  • Possible danger resulting from small fragments of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these magnets can disrupt the diagnostic process medical when they are in the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

The force parameter is a result of laboratory testing performed under specific, ideal conditions:
  • on a plate made of structural steel, perfectly concentrating the magnetic field
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • characterized by smoothness
  • without the slightest air gap between the magnet and steel
  • under axial force direction (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

Real force impacted by specific conditions, mainly (from most important):
  • Distance – existence of foreign body (paint, tape, air) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Material type – ideal substrate is high-permeability steel. Cast iron may attract less.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was assessed by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate reduces the holding force.

Warnings
Nickel coating and allergies

It is widely known that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, refrain from direct skin contact or opt for versions in plastic housing.

Protective goggles

Protect your eyes. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

GPS Danger

GPS units and smartphones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.

Threat to electronics

Do not bring magnets near a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Warning for heart patients

Individuals with a pacemaker should maintain an safe separation from magnets. The magnetism can disrupt the operation of the implant.

Mechanical processing

Fire hazard: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Bodily injuries

Mind your fingers. Two powerful magnets will join immediately with a force of several hundred kilograms, destroying everything in their path. Be careful!

Immense force

Use magnets with awareness. Their huge power can shock even professionals. Be vigilant and do not underestimate their power.

Keep away from children

Strictly store magnets away from children. Choking hazard is significant, and the effects of magnets connecting inside the body are life-threatening.

Heat warning

Avoid heat. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Caution! Looking for details? Read our article: Why are neodymium magnets dangerous?