FAQ
Order Status

tel: +48 22 499 98 98

Neodymiums – complete shape selection

Want to buy really powerful magnets? We have in stock complete range of disc, cylindrical and ring magnets. Perfect for for domestic applications, workshop and industrial tasks. See products available immediately.

check full offer

Magnet fishing: strong F200/F400 sets

Begin your hobby with treasure salvaging! Our specialized grips (F200, F400) provide safety guarantee and huge lifting capacity. Solid, corrosion-resistant housing and reinforced ropes are reliable in challenging water conditions.

choose your water magnet

Magnetic mounts for industry

Proven solutions for mounting non-invasive. Threaded grips (external or internal) provide instant organization of work on warehouses. They are indispensable mounting lighting, sensors and banners.

check technical specs

🚚 Order by 14:00 – we'll ship today!

Dhit sp. z o.o.
0
0.00 ZŁ
  1. home
  2. magnetic rubber handle with internal thread
  3. rubber coated holder umggw 29x8 [m4] gw / n38
← previous
next →
Product available Ships tomorrow

UMGGW 29x8 [M4] GW / N38 - magnetic holder rubber internal thread

magnetic holder rubber internal thread

Catalog no 160305

GTIN/EAN: 5906301813637

5.00

Diameter Ø

29 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

18 g

Load capacity

6.40 kg / 62.76 N

view parameters »

8.61 ZŁ with VAT / pcs + price for transport

7.00 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?
price from 1 pcs
7.00 ZŁ
8.61 ZŁ
price from 50 pcs
6.58 ZŁ
8.09 ZŁ
price from 150 pcs
6.16 ZŁ
7.58 ZŁ
Carbon Footprint – environmental impact GPSR Regulation – product safety
Want to talk magnets?

Give us a call +48 888 99 98 98 alternatively contact us using contact form our website.
Specifications along with form of neodymium magnets can be analyzed on our power calculator.

Orders submitted before 14:00 will be dispatched today!

Physical properties - UMGGW 29x8 [M4] GW / N38 - magnetic holder rubber internal thread

Specification / characteristics - UMGGW 29x8 [M4] GW / N38 - magnetic holder rubber internal thread

properties
properties values
Cat. no. 160305
GTIN/EAN 5906301813637
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 29 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 18 g
Load capacity ~ ? 6.40 kg / 62.76 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGW 29x8 [M4] GW / N38 - magnetic holder rubber internal 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
Engineering data and GPSR
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: 160305-2026
Quick Unit Converter
Magnet pull force
Magnetic Field
Enter a number in one of the inputs, and the remaining fields change on the fly.

Check out more deals

SM 25x125 [2xM8] / N42 - magnetic separator
Product available Ships tomorrow

SM 25x125 [2xM8] / N42 - magnetic separator

319.80 ZŁ brutto / pcs
UMGZ 48x24x11.5 [M8] GZ / N38 - magnetic holder external thread
Product available Ships tomorrow

UMGZ 48x24x11.5 [M8] GZ / N38 - magnetic holder external thread

59.90 ZŁ brutto / pcs
MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet
Product available Ships tomorrow

MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

9.93 ZŁ brutto / pcs
MPL 15x3x6 / N38 - lamellar magnet
Product available Ships tomorrow

MPL 15x3x6 / N38 - lamellar magnet

0.726 ZŁ brutto / pcs
Thanks to the use of flexible Santoprene rubber coating, these holders do not scratch paint and ensure excellent grip even on slippery surfaces. They are commonly used in the advertising industry (car wrapping, foil fixing), lighting (LED work lamps), and mobile monitoring. The internal threaded bushing allows quick mounting of any element, creating a solid mounting point without drilling holes in the sheet metal.
Yes, thanks to the hermetic rubber coating, these magnets are fully waterproof and protected against corrosion. They can be safely used outdoors all year round, maintaining their properties in a wide temperature range. This is the recommended choice for mounting on a car roof, because you can be sure that rusty stains will not appear on the paint after rain.
Although rubber creates a small distance reducing perpendicular pull-off force, it drastically increases resistance when trying to slide the magnet across the surface. 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. Just remember to choose the appropriate screw length – too long can push the rubber from the bottom and damage the paint.
Inside there are several magnets arranged with alternating poles on a steel plate, which closes the magnetic field close to the surface. Thanks to this, the magnet holds the sheet metal strongly but does not disturb devices in the cabin or attract metal objects from afar.

Advantages and disadvantages of neodymium magnets.

Benefits

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • They have stable power, and over more than ten years their performance decreases symbolically – ~1% (in testing),
  • Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
  • A magnet with a metallic silver surface has better aesthetics,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • Possibility of exact creating and modifying to concrete conditions,
  • Universal use in modern industrial fields – they serve a role in HDD drives, brushless drives, medical devices, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in miniature devices

Limitations

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child safety. Furthermore, small elements of these magnets can be problematic in diagnostics 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 parameters – what contributes to it?

Breakaway force was determined for ideal contact conditions, assuming:
  • on a block made of mild steel, optimally conducting the magnetic flux
  • whose thickness equals approx. 10 mm
  • with an polished touching surface
  • with zero gap (without coatings)
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Key elements affecting lifting force

Bear in mind that the magnet holding may be lower influenced by the following factors, starting with the most relevant:
  • Air gap (betwixt the magnet and the metal), as even a very small clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Angle of force application – highest force is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Stainless steels may attract less.
  • Plate texture – smooth surfaces ensure maximum contact, which improves force. Uneven metal reduce efficiency.
  • Temperature – heating the magnet results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity was determined using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Threat to navigation

GPS units and mobile phones are extremely susceptible to magnetism. Close proximity with a strong magnet can ruin the internal compass in your phone.

Keep away from children

These products are not toys. Eating a few magnets may result in them pinching intestinal walls, which poses a direct threat to life and necessitates immediate surgery.

Skin irritation risks

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If skin irritation appears, immediately stop handling magnets and wear gloves.

Serious injuries

Risk of injury: The attraction force is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Eye protection

Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Maximum temperature

Control the heat. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.

Cards and drives

Avoid bringing magnets near a wallet, laptop, or TV. The magnetism can permanently damage these devices and erase data from cards.

Warning for heart patients

Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Fire warning

Combustion risk: Neodymium dust is explosive. Do not process magnets in home conditions as this may cause fire.

Handling guide

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Safety First! Need more info? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98