e-mail: bok@dhit.pl

neodymium magnets

We provide red color magnetic Nd2Fe14B - our offer. Practically all "magnets" on our website are in stock for immediate purchase (check the list). Check out the magnet pricing for more details check the magnet price list

Magnet for treasure hunters F200 GOLD

Where to buy strong magnet? Magnet holders in solid and airtight steel casing are ideally suited for use in challenging climate conditions, including during snow and rain see

magnetic holders

Magnetic holders can be applied to enhance manufacturing, underwater discoveries, or locating meteorites from gold check...

Enjoy shipping of your order on the day of purchase before 2:00 PM on weekdays.

Dhit sp. z o.o.
Product available Ships in 3 days

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

rubber magnetic holder external thread

Catalog no 340313

GTIN: 5906301814757

5

Diameter Ø [±0,1 mm]

88 mm

Height [±0,1 mm]

8.5 mm

Weight

193 g

Load capacity

42.9 kg / 420.71 N

40.59 with VAT / pcs + price for transport

33.00 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
33.00 ZŁ
40.59 ZŁ
price from 10 pcs
31.02 ZŁ
38.15 ZŁ
price from 30 pcs
29.04 ZŁ
35.72 ZŁ

Looking for a better price?

Call us +48 22 499 98 98 or drop us a message using form the contact page.
Force along with structure of magnets can be verified using our force calculator.

Orders submitted before 14:00 will be dispatched today!

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
values
Cat. no.
340313
GTIN
5906301814757
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
88 mm [±0,1 mm]
Height
8.5 mm [±0,1 mm]
Weight
193 g [±0,1 mm]
Load capacity ~ ?
42.9 kg / 420.71 N
Manufacturing Tolerance
± 0.1 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

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. Guarantees no rusty stains on the paint, which happen with regular magnets.
Rubberized holders are the safest choice for painted surfaces. 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 thread size is standard and fits typical nuts available in hardware stores. The stud is an integral part of the steel base and cannot be unscrewed.
Thanks to the multi-pole system (Multi-Pole), force is concentrated at the surface, giving a strong grip. Holding force depends on the roof sheet thickness.

Strengths as well as weaknesses of NdFeB magnets.

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:

  • They have stable power, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • Neodymium magnets are remarkably resistant to magnetic field loss caused by external field sources,
  • The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to look better,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of accurate forming as well as modifying to precise requirements,
  • Huge importance in high-tech industry – they find application in magnetic memories, electromotive mechanisms, diagnostic systems, and multitasking production systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of producing threads in the magnet and complicated forms - preferred is a housing - mounting mechanism.
  • Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets can complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Maximum magnetic pulling forcewhat contributes to it?

Holding force of 42.9 kg is a theoretical maximum value performed under specific, ideal conditions:

  • using a sheet made of low-carbon steel, acting as a magnetic yoke
  • with a thickness of at least 10 mm
  • characterized by lack of roughness
  • with zero gap (without impurities)
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Magnet lifting force in use – key factors

Bear in mind that the magnet holding will differ subject to the following factors, in order of importance:

  • Gap between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Steel type – low-carbon steel attracts best. Alloy steels reduce magnetic properties and 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.
  • Thermal factor – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was measured with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the load capacity.

H&S for magnets

Serious injuries

Large magnets can break fingers in a fraction of a second. Under no circumstances put your hand betwixt two attracting surfaces.

Handling guide

Exercise caution. Rare earth magnets act from a long distance and connect with huge force, often quicker than you can move away.

Fragile material

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets leads to them cracking into small pieces.

Heat warning

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

Implant safety

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

Electronic hazard

Equipment safety: Neodymium magnets can damage payment cards and sensitive devices (heart implants, medical aids, timepieces).

Phone sensors

An intense magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Keep magnets near a device to avoid damaging the sensors.

Skin irritation risks

Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction happens, cease working with magnets and use protective gear.

Choking Hazard

Only for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Store out of reach of children and animals.

Dust is flammable

Fire hazard: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.

Safety First!

Details 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