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SM 25x300 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130295

GTIN: 5906301812883

5.00

Diameter Ø

25 mm [±1 mm]

Height

300 mm [±1 mm]

Weight

0.01 g

Magnetic Flux

~ 6 500 Gauss [±5%]

836.40 ZŁ with VAT / pcs + price for transport

680.00 ZŁ net + 23% VAT / pcs

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SM 25x300 [2xM8] / N42 - magnetic separator

Specification / characteristics SM 25x300 [2xM8] / N42 - magnetic separator

properties

properties	values
Cat. no.	130295
GTIN	5906301812883
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	25 mm [±1 mm]
Height	300 mm [±1 mm]
Weight	0.01 g
Material Type	Stainless steel AISI 304 / A2
Magnetic Flux	~ 6 500 Gauss [±5%]
Size/Mount Quantity	2xM8
Polarity	circumferential - 11 poles
Casing Tube Thickness	1 mm
Manufacturing Tolerance	±1 mm

Magnetic properties of material N42

Specification / characteristics SM 25x300 [2xM8] / N42 - magnetic separator

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

Quick Unit Converter

Magnet Pull Force

Force in kg

Force (N)

Force in lbs

Magnetic Induction

Gauss (Gs)

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It is the "heart" of every magnetic filter used in industry for cleaning raw materials. It is mounted in chutes, hoppers, and pipelines to protect production machines from failure. Thanks to the use of strong neodymium magnets, the rod catches even metallic dust.

The rod consists of a cover tube made of high-quality acid-resistant steel (AISI 304 or 316). Inside there is a stack of strong neodymium magnets arranged in a special configuration (magnetic circuit). Thanks to this, the rod is durable, hygienic, and easy to keep clean.

Metal contaminants are strongly attracted, so removing them with a bare hand or glove can be difficult. The most effective home method is using adhesive tape, which we wrap around the dirt and peel off. For easier operation, it is worth considering ordering a rod in a version with a cleaning sleeve.

The more Gauss, the smaller and more weakly magnetic particles will be effectively caught. For basic machine protection against pieces of iron, standard power is sufficient. For the food and precision industry, we recommend the highest induction parameters.

We fulfill individual orders for bars perfectly matched to your machine or separator. You can choose a mounting method consistent with your technical design. We ensure fast realization of special orders and technical advice.

Advantages as well as disadvantages of neodymium magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
Neodymium magnets are distinguished by extremely resistant to magnetic field loss caused by external interference,
Thanks to the shiny finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
Magnetic induction on the surface of the magnet turns out to be extremely intense,
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...
Thanks to versatility in shaping and the capacity to modify to individual projects,
Universal use in advanced technology sectors – they are utilized in magnetic memories, electric drive systems, medical devices, also industrial machines.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in compact constructions

Disadvantages

What to avoid - cons of neodymium magnets and ways of using them

At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
Neodymium magnets decrease their strength 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 stability even at temperatures up to 230°C
They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
Limited possibility of creating threads in the magnet and complicated forms - recommended is a housing - mounting mechanism.
Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these magnets are able to be problematic in diagnostics medical after entering the body.
With large orders the cost of neodymium magnets is economically unviable,

Pull force analysis

Magnetic strength at its maximum – what affects it?

The lifting capacity listed is a theoretical maximum value performed under standard conditions:

with the use of a yoke made of special test steel, ensuring maximum field concentration
with a thickness of at least 10 mm
with an polished touching surface
with direct contact (without impurities)
for force acting at a right angle (in the magnet axis)
at standard ambient temperature

Determinants of lifting force in real conditions

During everyday use, the actual holding force is determined by a number of factors, ranked from the most important:

Space between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of nominal force).
Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
Steel grade – the best choice is pure iron steel. Hardened steels may generate lower lifting capacity.
Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. In addition, even a small distance between the magnet and the plate reduces the load capacity.

Safe handling of neodymium magnets

Keep away from children

Strictly store magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are tragic.

Protective goggles

NdFeB magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets leads to them cracking into shards.

Magnetic media

Intense magnetic fields can destroy records on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Impact on smartphones

Navigation devices and mobile phones are highly susceptible to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Bodily injuries

Risk of injury: The pulling power is so great that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Allergy Warning

It is widely known that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, prevent direct skin contact or choose encased magnets.

Combustion hazard

Powder created during cutting of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

Handling rules

Handle magnets consciously. Their huge power can shock even professionals. Plan your moves and do not underestimate their force.

Pacemakers

Patients with a ICD have to maintain an absolute distance from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Thermal limits

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.

Security! Want to know more? Read our article: Why are neodymium magnets dangerous?

SM 25x300 [2xM8] / N42 - magnetic separator

Looking for a better price?

SM 25x300 [2xM8] / N42 - magnetic separator

Magnetic properties of material N42

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Magnet Pull Force

Magnetic Induction

Other deals

SMZR 25x250 / N52 - magnetic separator with handle

SMZR 32x150 / N52 - magnetic separator with handle

MPL 50x50x25 / N38 - lamellar magnet

SM 18x100 [2xM5] / N42 - magnetic separator

Advantages as well as disadvantages of neodymium magnets.

Advantages

Disadvantages

Pull force analysis

Magnetic strength at its maximum – what affects it?

Determinants of lifting force in real conditions

Keep away from children

Protective goggles

Magnetic media

Impact on smartphones

Bodily injuries

Allergy Warning

Combustion hazard

Handling rules

Pacemakers

Thermal limits

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C