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neodymium magnets

We offer blue color magnets Nd2Fe14B - our offer. All "magnets" on our website are available for immediate purchase (see the list). See the magnet price list for more details see the magnet price list

Magnet for water searching F400 GOLD

Where to buy strong neodymium magnet? Magnetic holders in airtight, solid enclosure are excellent for use in variable and difficult weather conditions, including in the rain and snow see

magnetic holders

Holders with magnets can be used to enhance production, underwater exploration, or locating meteors from gold see...

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UMS 20x8.6x4.5x7 / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220327

GTIN: 5906301814177

5

Diameter Ø

20 mm [±1 mm]

cone dimension Ø

8.6x4.5 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

12 g

Magnetization Direction

↑ axial

Load capacity

6 kg / 58.84 N

Coating

[NiCuNi] nickel

6.46 with VAT / pcs + price for transport

5.25 ZŁ net + 23% VAT / pcs

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UMS 20x8.6x4.5x7 / N38 - conical magnetic holder
Specification/characteristics UMS 20x8.6x4.5x7 / N38 - conical magnetic holder
properties
values
Cat. no.
220327
GTIN
5906301814177
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
20 mm [±1 mm]
cone dimension Ø
8.6x4.5 mm [±1 mm]
Height
7 mm [±1 mm]
Weight
12 g
Magnetization Direction
↑ axial
Load capacity ~ ?
6 kg / 58.84 N
Coating
[NiCuNi] nickel
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

It is the most popular solution for creating aesthetic, invisible door locks. Thanks to the hole with a chamfer (conical), the screw head hides in the magnet, ensuring a flat contact surface. Model UMS 20x8.6x4.5x7 / N38 will successfully hold inspection doors, tools in the workshop, or shop display elements.
Despite the steel housing, the magnet itself is prone to cracking under strong point pressure. We recommend tightening manually with feeling (screwdriver), not an impact driver. Using too large a countersunk screw may cause the magnetic ring to crack.
Two identical magnets (e.g., both N) bought randomly will repel each other with mounting sides. In our offer, we try to mark or pair holders if explicitly stated in the description. A set of magnet + plate is cheaper and holds just as strongly.
This force is measured in ideal laboratory conditions when pulling at a 90-degree angle. If the magnet hangs vertically, gravity causes it to slide with much less load. Paint or veneer on metal also reduces effective attraction force.
A magnet in a housing is stronger on one side (from the chamfer side) than a bare magnet of the same dimensions. The housing absorbs impacts, preventing the magnet from crumbling and cracking. A bare ring has a dispersed field on both sides but is weaker in point holding.

Advantages and disadvantages of neodymium magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

  • They retain attractive force for nearly 10 years – the loss is just ~1% (in theory),
  • They possess excellent resistance to magnetism drop when exposed to external fields,
  • In other words, due to the reflective surface of gold, the element gains a professional look,
  • Magnetic induction on the working part of the magnet turns out to be exceptional,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
  • Possibility of precise machining as well as modifying to atypical requirements,
  • Universal use in high-tech industry – they are used in computer drives, electric drive systems, diagnostic systems, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in compact constructions

Cons of neodymium magnets: weaknesses and usage proposals

  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 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 immune to moisture, when using outdoors
  • We recommend a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. It is also worth noting that tiny parts 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

Optimal lifting capacity of a neodymium magnetwhat affects it?

The specified lifting capacity concerns the limit force, obtained under optimal environment, meaning:

  • on a base made of mild steel, effectively closing the magnetic flux
  • whose thickness reaches at least 10 mm
  • with an ideally smooth contact surface
  • without the slightest insulating layer between the magnet and steel
  • 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 a number of factors, ranked from the most important:

  • Clearance – the presence of any layer (rust, tape, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material type – ideal substrate is high-permeability steel. Hardened steels may attract less.
  • Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
  • Thermal factor – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

* Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, whereas under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a small distance {between} the magnet’s surface and the plate reduces the load capacity.

Warnings

ICD Warning

Medical warning: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Sensitization to coating

Some people experience a contact allergy to nickel, which is the common plating for NdFeB magnets. Prolonged contact can result in skin redness. We recommend wear safety gloves.

Respect the power

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Demagnetization risk

Control the heat. Exposing the magnet to high heat will ruin its properties and strength.

Protect data

Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Keep away from electronics

Be aware: neodymium magnets produce a field that interferes with sensitive sensors. Maintain a safe distance from your mobile, device, and GPS.

Magnets are brittle

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Choking Hazard

Strictly keep magnets away from children. Choking hazard is high, and the consequences of magnets connecting inside the body are very dangerous.

Pinching danger

Large magnets can crush fingers in a fraction of a second. Under no circumstances place your hand betwixt two strong magnets.

Flammability

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

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