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UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

rubber magnetic holder external thread

Catalog no 340313

GTIN/EAN: 5906301814757

5.00

Diameter Ø

88 mm [±1 mm]

Height

8.5 mm [±1 mm]

Weight

193 g

Load capacity

42.90 kg / 420.71 N

40.59 with VAT / pcs + price for transport

33.00 ZŁ net + 23% VAT / pcs

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Technical - UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

Specification / characteristics - UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

properties
properties values
Cat. no. 340313
GTIN/EAN 5906301814757
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 88 mm [±1 mm]
Height 8.5 mm [±1 mm]
Weight 193 g
Load capacity ~ ? 42.90 kg / 420.71 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread
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%
Environmental data
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: 340313-2026
Quick Unit Converter
Force (pull)

Field Strength

Other proposals

This type of holder is standard when mounting lighting (beacons), antennas, searchlights, and cameras on a car roof. It is a safe and durable mounting without drilling holes in the bodywork.
The magnet is tightly sealed with rubber, which protects it from water, road salt, mud, and corrosion. Guarantees no rusty stains on the paint, which happen with regular magnets.
Soft rubber provides a barrier between the hard magnet and the paint, eliminating the risk of scratches. However, it is worth remembering to wipe the roof of dust and sand before mounting so that it does not get under the magnet.
The length of the protruding screw is usually from 8 to 15 mm (you will find the exact dimension in the technical specification). Allows easy lamp mounting by passing the screw through the hole in the holder and tightening the nut.
Although nominal capacity (e.g., 42.90 kg) is lower than a bare magnet, real adhesion on slippery paint is much better. Model UMGGZ 88x8.5 [M8] GZ / N38 is adapted to hold elements at road speeds if you choose the right number of mounting points.

Advantages and disadvantages of neodymium magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose strength, even after approximately ten years – the drop in strength is only ~1% (based on measurements),
  • Magnets effectively protect themselves against demagnetization caused by foreign field sources,
  • A magnet with a smooth silver surface looks better,
  • Magnets exhibit exceptionally strong magnetic induction on the outer side,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of accurate shaping as well as modifying to precise requirements,
  • Wide application in future technologies – they find application in HDD drives, electric motors, medical devices, also multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Problematic aspects of neodymium magnets: tips and applications.
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating threads in the magnet and complex shapes - recommended is casing - magnet mounting.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these magnets can complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price is relatively high,

Lifting parameters

Detachment force of the magnet in optimal conditionswhat contributes to it?

The lifting capacity listed is a theoretical maximum value conducted under the following configuration:
  • using a base made of high-permeability steel, serving as a circuit closing element
  • whose thickness reaches at least 10 mm
  • characterized by smoothness
  • under conditions of gap-free contact (metal-to-metal)
  • for force acting at a right angle (pull-off, not shear)
  • at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

Effective lifting capacity is influenced by working environment parameters, such as (from most important):
  • Distance – existence of any layer (paint, dirt, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Material composition – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface quality – the more even the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet and the plate lowers the load capacity.

H&S for magnets
Risk of cracking

Beware of splinters. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Maximum temperature

Avoid heat. NdFeB magnets are sensitive to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Keep away from electronics

A strong magnetic field disrupts the functioning of magnetometers in smartphones and GPS navigation. Keep magnets near a smartphone to prevent damaging the sensors.

Caution required

Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Fire risk

Machining of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Safe distance

Very strong magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

ICD Warning

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

This is not a toy

Strictly store magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are fatal.

Metal Allergy

Some people suffer from a sensitization to Ni, which is the standard coating for neodymium magnets. Frequent touching may cause dermatitis. It is best to wear protective gloves.

Pinching danger

Big blocks can crush fingers instantly. Never put your hand betwixt two attracting surfaces.

Attention! Learn more about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98