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neodymium magnets

We provide yellow color magnetic Nd2Fe14B - our store's offer. All magnesy neodymowe on our website are in stock for immediate purchase (see the list). Check out the magnet pricing for more details see the magnet price list

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Where to purchase strong magnet? Holders with magnets in airtight and durable steel casing are perfect for use in difficult, demanding climate conditions, including in the rain and snow more

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UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread

magnetic holder rubber internal thread

Catalog no 160306

GTIN: 5906301813644

5

Diameter Ø

34 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

22 g

Load capacity

7.7 kg / 75.51 N

9.84 with VAT / pcs + price for transport

8.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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price from 1 pcs
8.00 ZŁ
9.84 ZŁ
price from 50 pcs
7.52 ZŁ
9.25 ZŁ
price from 100 pcs
7.04 ZŁ
8.66 ZŁ

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Force and form of neodymium magnets can be checked with our our magnetic calculator.

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UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread
Specification/characteristics UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread
properties
values
Cat. no.
160306
GTIN
5906301813644
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
34 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
22 g
Load capacity ~ ?
7.7 kg / 75.51 N
Manufacturing Tolerance
±1 mm

Magnetic properties of material N38

properties
values
units
remenance Br [Min. - Max.] ?
12.2-12.6
kGs
remenance Br [Min. - Max.] ?
1220-1260
T
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

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 106
°C-1
Thermal expansion perpendicular (⊥) to orientation (M)
-(1-3) x 10-6
°C-1
Young's modulus
1.7 x 104
kg/mm²

Shopping tips

Thanks to the use of soft Santoprene rubber coating, these holders do not scratch paint and ensure stability even on slippery surfaces. Used for mounting taxi beacons, antennas, cameras, and license plates at rallies, where mobility counts. The internal threaded bushing allows quick mounting of any element, creating a solid mounting point without drilling holes in the sheet metal.
Full rubberizing effectively isolates the magnetic system from moisture, road salt, and dirt, making them an ideal solution for outdoor applications. They can be safely used outdoors all year round, maintaining their properties in a wide temperature range. This is the best choice for mounting on a car roof, because you can be sure that rusty stains will not appear on the paint after rain.
Rubber has a very high coefficient of friction, which makes the holder extremely difficult to move sideways (high shear force acts). Thanks to this, these magnets hold onto the car roof excellently even at high speeds and wind resistance. They ensure safety of mounting under vibrations, which is crucial in transport and automotive.
You can screw any metric bolt, hook, handle, cable holder into the magnet or screw the device housing directly. This enables quick creation of a magnetic base for work lighting, reversing cameras, sensors, or advertising boards.
Inside there are several magnets arranged with alternating poles on a steel plate, which closes the magnetic field close to the surface. Field concentration allows achieving high holding force 7.7 kg despite the distance created by the rubber layer.

Strengths as well as weaknesses of neodymium magnets.

Besides their stability, neodymium magnets are valued for these benefits:

  • They retain full power for almost ten years – the drop is just ~1% (according to analyses),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • In other words, due to the smooth finish of silver, the element looks attractive,
  • Magnetic induction on the top side of the magnet is exceptional,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
  • Thanks to freedom in designing and the capacity to customize to client solutions,
  • Universal use in modern technologies – they serve a role in hard drives, drive modules, diagnostic systems, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in compact constructions

Cons of neodymium magnets: application proposals

  • At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding 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
  • Limited possibility of making threads in the magnet and complicated forms - preferred is casing - magnetic holder.
  • Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Furthermore, small components of these products are able to complicate diagnosis medical after entering the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Highest magnetic holding forcewhat contributes to it?

Breakaway force was determined for ideal contact conditions, including:

  • with the application of a sheet made of special test steel, guaranteeing maximum field concentration
  • whose transverse dimension reaches at least 10 mm
  • with an ground touching surface
  • without the slightest clearance between the magnet and steel
  • during pulling in a direction vertical to the plane
  • at ambient temperature room level

Determinants of practical lifting force of a magnet

Effective lifting capacity impacted by specific conditions, including (from priority):

  • Distance – the presence of any layer (rust, dirt, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Plate thickness – too thin plate does not accept the full field, causing part of the power to be wasted to the other side.
  • Material type – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Surface quality – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Temperature – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance {between} the magnet and the plate lowers the holding force.

H&S for magnets

Do not give to children

Neodymium magnets are not intended for children. Eating several magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and necessitates immediate surgery.

Safe operation

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

ICD Warning

Warning for patients: Strong magnetic fields affect electronics. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Hand protection

Danger of trauma: The attraction force is so great that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Avoid contact if allergic

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.

Fire risk

Fire warning: Neodymium dust is explosive. Do not process magnets in home conditions as this risks ignition.

Precision electronics

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

Operating temperature

Monitor thermal conditions. Heating the magnet to high heat will destroy its properties and strength.

Magnetic media

Very strong magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Material brittleness

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets will cause them breaking into small pieces.

Security!

More info about hazards in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98