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neodymium magnets

We provide red color magnetic Nd2Fe14B - our proposal. Practically all magnesy neodymowe in our store are available for immediate purchase (see the list). Check out the magnet price list for more details check the magnet price list

Magnets for water searching F200 GOLD

Where to buy powerful magnet? Holders with magnets in airtight, solid enclosure are excellent for use in variable and difficult weather, including in the rain and snow see

magnetic holders

Magnetic holders can be used to facilitate production processes, exploring underwater areas, or finding meteors from gold see...

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Dhit sp. z o.o.
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UMP 75x25 [M10x3] GW F200 GOLD Lina / N42 - search holder

search holder

Catalog no 210433

GTIN: 5906301814085

5

Diameter Ø [±0,1 mm]

75 mm

Height [±0,1 mm]

25 mm

Weight

900 g

Load capacity

310 kg / 3040.06 N

Coating

[NiCuNi] nickel

200.00 with VAT / pcs + price for transport

162.60 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
162.60 ZŁ
200.00 ZŁ
price from 10 pcs
152.84 ZŁ
188.00 ZŁ
price from 20 pcs
143.09 ZŁ
176.00 ZŁ

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Contact us by phone +48 22 499 98 98 alternatively drop us a message by means of contact form the contact section.
Strength along with appearance of a magnet can be calculated using our power calculator.

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UMP 75x25 [M10x3] GW F200 GOLD Lina / N42 - search holder
Specification/characteristics UMP 75x25 [M10x3] GW F200 GOLD Lina / N42 - search holder
properties
values
Cat. no.
210433
GTIN
5906301814085
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
75 mm [±0,1 mm]
Height
25 mm [±0,1 mm]
Weight
900 g [±0,1 mm]
Load capacity ~ ?
310 kg / 3040.06 N
Coating
[NiCuNi] nickel
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N42

properties
values
units
remenance Br [Min. - Max.] ?
12.9-13.2
kGs
remenance Br [Min. - Max.] ?
1290-1320
T
coercivity bHc ?
10.8-12.0
kOe
coercivity bHc ?
860-955
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.] ?
40-42
BH max MGOe
energy density [Min. - Max.] ?
318-334
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

For underwater searches, we recommend specialized holders from the GOLD series, designed for working in difficult conditions. Model UMP 75x25 [M10x3] GW F200 GOLD Lina / N42 offers an optimal weight-to-pull force ratio, which is important for repeated throwing. The choice depends on whether you plan to throw from the shore (double-sided) or from a bridge (single-sided).
The 2xTwo-Side version is more versatile, allowing the eyelet to be mounted in two positions. Side mounting is ideal for throwing from the shore, as the magnet drags flat along the bottom. Single-sided magnets are usually lighter and cheaper but less effective for long throws.
Our holders have a thick steel housing covered with an anti-corrosion layer (chrome, nickel, zinc). The housing significantly increases lifespan but does not make the magnet completely indestructible. Maintenance (e.g., WD-40) prevents surface corrosion of the steel housing.
Most of our starter kits are complete and ready to use. We often add thread glue to secure the eyelet against unscrewing in water. We recommend always securing the thread with glue or tightening the eyelet firmly before first use.
This force applies to perfect adherence with the entire surface to a smooth, clean steel plate with a min. thickness of 20mm. Dirt, rust, paint, and algae create a distance that weakens the magnet by even 70-80%. Therefore, to pull objects weighing 10kg from the water, a magnet with a capacity of 200-300kg is often needed.
Searches are allowed as long as you do not interfere with archaeological sites or search for weapons. We recommend familiarizing yourself with current local regulations and heritage protection laws.

Pros as well as cons of neodymium magnets.

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

  • Their magnetic field is maintained, and after approximately 10 years it drops only by ~1% (theoretically),
  • Neodymium magnets prove to be highly resistant to magnetic field loss caused by external magnetic fields,
  • A magnet with a metallic gold surface has better aesthetics,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of individual shaping and optimizing to concrete conditions,
  • Versatile presence in modern technologies – they find application in magnetic memories, drive modules, precision medical tools, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in miniature devices

What to avoid - cons of neodymium magnets: weaknesses and usage proposals

  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures 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 resistant to moisture, in case of application outdoors
  • We suggest a housing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Additionally, small components of these devices can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Magnetic strength at its maximum – what it depends on?

Holding force of 310 kg is a theoretical maximum value executed under the following configuration:

  • on a base made of mild steel, optimally conducting the magnetic flux
  • with a cross-section minimum 10 mm
  • characterized by lack of roughness
  • under conditions of no distance (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature room level

Lifting capacity in practice – influencing factors

In real-world applications, the actual holding force results from several key aspects, ranked from crucial:

  • Clearance – existence of any layer (paint, dirt, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Steel grade – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Surface finish – ideal contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Temperature – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under shearing force the holding force is lower. In addition, even a slight gap {between} the magnet’s surface and the plate lowers the load capacity.

Safety rules for work with NdFeB magnets

GPS Danger

Navigation devices and smartphones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Finger safety

Pinching hazard: The pulling power is so immense that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.

Operating temperature

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

Choking Hazard

Absolutely store magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are tragic.

Eye protection

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Clashing of two magnets will cause them shattering into shards.

Threat to electronics

Avoid bringing magnets close to a purse, laptop, or TV. The magnetic field can destroy these devices and wipe information from cards.

Implant safety

Warning for patients: Strong magnetic fields disrupt electronics. Keep at least 30 cm distance or ask another person to handle the magnets.

Warning for allergy sufferers

Studies show that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, prevent direct skin contact and opt for coated magnets.

Do not underestimate power

Handle magnets with awareness. Their powerful strength can surprise even professionals. Plan your moves and do not underestimate their force.

Dust is flammable

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Attention!

Details about hazards in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98