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SM 28x100 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130513

Diameter Ø
28 mm [±1 mm]
Height
100 mm [±1 mm]
Weight
360 g
Magnetic Flux
~ 8 500 Gauss [±5%]

How we measure these parameters — certificates and measurements

view parameters »

330.00 zł net / pcs

405.90 zł with VAT (23% VAT) / pcs

price for transport

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Frequently asked questions

Which rod should I choose for fine contamination?
For particles below 0.5 mm — a Ø32 mm rod in grade N52, with surface induction of about 10,000 Gs. A Ø25 rod in grade N42 gives about 6,500 Gs and is chosen for contamination above 1 mm: bolts, washers, pieces of wire.
Which rod pitch should I choose?
The narrow pitch, 40 mm centre to centre, for fine free-flowing fractions — it gives denser coverage of the cross-section. The wide pitch, 50 mm, for granulates and for damp, greasy or sticky materials, where a narrow pitch risks the material bridging above the rods.
Why does efficiency drop after a few weeks of operation?
Almost always because the separator has not been cleaned. The layer of captured particles shields the field, and further particles settle on that layer rather than on the rod surface, where the gradient is far stronger. The magnets themselves do not weaken at that rate.

Guides from the knowledge base

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Detailed specification - SM 28x100 [2xM8] / N52 - magnetic separator

Specification / characteristics - SM 28x100 [2xM8] / N52 - magnetic separator

properties
properties values
Cat. no. 130513
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 28 mm [±1 mm]
Height 100 mm [±1 mm]
Weight 360 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 8 500 Gauss [±5%]
Size/Mount Quantity M8x2
Polarity circumferential - 3 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics SM 28x100 [2xM8] / N52 - magnetic separator
properties values units
remenance Br [min. - max.] ? 14.2-14.7 kGs
remenance Br [min. - max.] ? 1420-1470 mT
coercivity bHc ? 10.8-12.5 kOe
coercivity bHc ? 860-995 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 48-53 BH max MGOe
energy density [min. - max.] ? 380-422 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 310 °C
Curie Temperature TF 590 °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

Table 1: Rod construction
SM 28x100 [2xM8] / N52

Parameter Value Description / Unit
Diameter (Ø) 28 mm
Total length 100 mm (L)
Active length 64 mm
Section count 2 modules
Dead zone 36 mm (2x 18mm starter)
Weight (est.) ~468 g
Active area 56 cm² (Area)
Housing material AISI 304 1.4301 (Inox)
Surface finish Ra < 0.8 µm Polished
Temp. class 80°C Standard (N)
Force loss (at max °C) -12.8% Reversible loss (physics)
Force (calculated) 22.7 kg (theor.)
Induction (surface) ~8 500 Gauss (Max)
Max T = 80°C. Construction data for M8/M10 thread series.

Chart 2: Field profile (2 sections)

Simulation: 2 magnetic modules (pitch 23 mm).

Chart 3: Temperature performance

Technical and environmental data

Chemical composition

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: 130513-2026
Measurement Calculator

Magnet pull force

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A magnetic rod is the basic element of building grate separators and magnetic filters. It is commonly used for cleaning flour, sugar, plastic granules, as well as oils and coolants. High magnetic induction on the surface allows catching the finest iron particles.
The rod consists of a cover tube made of high-quality acid-resistant steel (AISI 304 or 316). The center is filled with NdFeB magnets and pole pieces, arranged to maximize the field on the tube surface. Such construction ensures full resistance to corrosion, water, oils, and acids.
Metal contaminants are strongly attracted, so removing them with a bare hand or glove can be difficult. You can use compressed air or special non-magnetic strippers (rings). 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. Standard rods (~8000 Gs) are sufficient for catching screws, nails, and steel shavings. High induction is necessary when contaminants are microscopic or weakly magnetic.
We can produce a rod of non-standard length with any mounting termination. You can choose a mounting method consistent with your technical design. We ensure fast realization of special orders and technical advice.

Strengths as well as weaknesses of rare earth magnets.

Pros

Besides their tremendous pulling force, neodymium magnets offer the following advantages:
  • They do not lose strength, even after approximately 10 years – the decrease in strength is only ~1% (theoretically),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • Thanks to the glossy finish, the coating of Ni-Cu-Ni, gold, or silver gives an modern appearance,
  • Magnetic induction on the surface of the magnet turns out to be strong,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of individual modeling and optimizing to defined needs,
  • Versatile presence in advanced technology sectors – they serve a role in data components, electric drive systems, medical devices, as well as complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

What to avoid - cons of neodymium magnets and ways of using them
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in realizing nuts and complex forms in magnets, we propose using a housing - magnetic mechanism.
  • Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small elements of these devices can disrupt the diagnostic process medical in case of swallowing.
  • 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

Maximum magnetic pulling force – what affects it?

Holding force of 0.00 kg is a result of laboratory testing conducted under standard conditions:
  • on a block made of mild steel, optimally conducting the magnetic field
  • with a cross-section of at least 10 mm
  • with an ideally smooth contact surface
  • with zero gap (without paint)
  • under axial force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

Effective lifting capacity is influenced by working environment parameters, mainly (from priority):
  • Clearance – the presence of foreign body (rust, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material type – the best choice is pure iron steel. Hardened steels may generate lower lifting capacity.
  • Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under shearing force the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

H&S for magnets
Magnet fragility

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Safe operation

Use magnets consciously. Their immense force can shock even professionals. Plan your moves and respect their power.

Magnetic interference

A powerful magnetic field disrupts the operation of compasses in smartphones and navigation systems. Keep magnets near a device to prevent breaking the sensors.

Avoid contact if allergic

A percentage of the population experience a hypersensitivity to Ni, which is the standard coating for NdFeB magnets. Frequent touching can result in skin redness. We recommend use protective gloves.

Machining danger

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

Heat warning

Standard neodymium magnets (grade N) lose power when the temperature goes above 80°C. Damage is permanent.

Pinching danger

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

Do not give to children

Only for adults. Tiny parts pose a choking risk, leading to serious injuries. Keep away from children and animals.

Medical interference

Patients with a pacemaker should maintain an safe separation from magnets. The magnetic field can stop the functioning of the life-saving device.

Data carriers

Avoid bringing magnets near a purse, laptop, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Important! Need more info? Check our post: Why are neodymium magnets dangerous?