tel: +48 22 499 98 98

neodymium magnets

We offer yellow color magnets Nd2Fe14B - our offer. All "magnets" on our website are in stock for immediate purchase (check the list). See the magnet price list for more details check the magnet price list

Magnet for water searching F200 GOLD

Where to buy very strong neodymium magnet? Magnet holders in airtight and durable enclosure are ideally suited for use in variable and difficult weather, including during rain and snow more

magnets with holders

Magnetic holders can be applied to improve production, underwater exploration, or locating space rocks made of ore read...

Shipping is always shipped if the order is placed before 2:00 PM on weekdays.

Dhit sp. z o.o.
Product available Ships today (order by 14:00)

UMGGZ 66x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

rubber magnetic holder external thread

Catalog no 340423

GTIN/EAN: 5906301814764

5.00

Diameter Ø

66 mm [±1 mm]

Height

8.5 mm [±1 mm]

Weight

100 g

Load capacity

18.40 kg / 180.44 N

23.37 with VAT / pcs + price for transport

19.00 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
19.00 ZŁ
23.37 ZŁ
price from 20 pcs
17.86 ZŁ
21.97 ZŁ
price from 50 pcs
16.72 ZŁ
20.57 ZŁ
Need help making a decision?

Pick up the phone and ask +48 888 99 98 98 otherwise let us know through form through our site.
Parameters along with appearance of a neodymium magnet can be estimated with our force calculator.

Orders placed before 14:00 will be shipped the same business day.

UMGGZ 66x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

Specification / characteristics UMGGZ 66x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

properties
properties values
Cat. no. 340423
GTIN/EAN 5906301814764
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 66 mm [±1 mm]
Height 8.5 mm [±1 mm]
Weight 100 g
Load capacity ~ ? 18.40 kg / 180.44 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGZ 66x8.5 [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 and environmental data
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: 340423-2025
Measurement Calculator
Magnet Pull Force

Magnetic Induction

Other proposals

This type of holder is standard when mounting lighting (beacons), antennas, searchlights, and cameras on a car roof. Ideally suited for outdoor, off-road applications and on special vehicles.
The magnet is tightly sealed with rubber, which protects it from water, road salt, mud, and corrosion. The rubber is resistant to UV radiation and does not crack in the sun.
Soft rubber provides a barrier between the hard magnet and the paint, eliminating the risk of scratches. Rubber has a high coefficient of friction, ensuring stability even with vibrations and wind.
The magnet has a permanently built-in stud with a metric thread (usually M4, M6, or M8). It is a solid threaded connection made of galvanized steel, resistant to breaking.
Rubber creates a distance between the magnet and metal, which slightly reduces perpendicular attraction force but drastically increases friction force. For secure mounting on a car roof, we recommend using several holders (e.g., 3-4 pieces per lamp).

Pros as well as cons of Nd2Fe14B magnets.

Strengths
In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They do not lose strength, even after nearly 10 years – the reduction in lifting capacity is only ~1% (according to tests),
  • Magnets perfectly defend themselves against loss of magnetization caused by ambient magnetic noise,
  • Thanks to the shimmering finish, the plating of nickel, gold, or silver gives an professional appearance,
  • Neodymium magnets ensure maximum magnetic induction on a small surface, which ensures high operational effectiveness,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
  • Thanks to flexibility in constructing and the capacity to customize to complex applications,
  • Versatile presence in future technologies – they find application in magnetic memories, brushless drives, advanced medical instruments, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in small systems
Limitations
Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening 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 extremely resistant to heat
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Limited possibility of creating nuts in the magnet and complex forms - preferred is cover - magnetic holder.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these magnets are able to complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Best holding force of the magnet in ideal parameterswhat contributes to it?
The force parameter is a measurement result performed under specific, ideal conditions:
  • on a block made of mild steel, perfectly concentrating the magnetic field
  • whose thickness equals approx. 10 mm
  • with an polished touching surface
  • under conditions of gap-free contact (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • at temperature approx. 20 degrees Celsius
Key elements affecting lifting force
In practice, the real power is determined by several key aspects, listed from crucial:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material composition – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
  • Surface structure – the more even the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

H&S for magnets
Electronic devices

Do not bring magnets close to a wallet, computer, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Medical interference

For implant holders: Strong magnetic fields affect electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Choking Hazard

NdFeB magnets are not toys. Swallowing multiple magnets may result in them pinching intestinal walls, which poses a direct threat to life and necessitates immediate surgery.

Conscious usage

Exercise caution. Neodymium magnets attract from a distance and connect with massive power, often quicker than you can react.

Operating temperature

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

Serious injuries

Mind your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Protective goggles

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets will cause them breaking into shards.

Impact on smartphones

A powerful magnetic field negatively affects the functioning of compasses in phones and navigation systems. Maintain magnets near a smartphone to avoid damaging the sensors.

Nickel allergy

A percentage of the population experience a sensitization to Ni, which is the typical protective layer for neodymium magnets. Frequent touching may cause dermatitis. It is best to use safety gloves.

Machining danger

Fire warning: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.

Attention! Want to know more? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98