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SM 18x175 [2xM5] / N42 - magnetic separator

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

magnetic separator

Catalog no 130272

GTIN/EAN: 5906301812746

Diameter Ø

18 mm [±1 mm]

Height

175 mm [±1 mm]

Weight

0.01 g

Magnetic Flux

~ 5 400 Gauss [±5%]

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387.45 ZŁ with VAT / pcs + price for transport

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Technical of the product - SM 18x175 [2xM5] / N42 - magnetic separator

Specification / characteristics - SM 18x175 [2xM5] / N42 - magnetic separator

properties

properties	values
Cat. no.	130272
GTIN/EAN	5906301812746
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	18 mm [±1 mm]
Height	175 mm [±1 mm]
Weight	0.01 g
Material Type	Stainless steel AISI 304 / A2
Magnetic Flux	~ 5 400 Gauss [±5%]
Size/Mount Quantity	2xM5
Polarity	circumferential - 8 poles
Casing Tube Thickness	1 mm
Manufacturing Tolerance	±1 mm

Magnetic properties of material N42

Specification / characteristics SM 18x175 [2xM5] / N42 - magnetic separator

properties	values	units
remenance Br [min. - max.] ?	12.9-13.2	kGs
remenance Br [min. - max.] ?	1290-1320	mT
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 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 simulation of the magnet - technical parameters

The following data represent the direct effect of a mathematical calculation. Results were calculated on models for the material Nd₂Fe₁₄B. Operational parameters might slightly differ. Please consider these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - characteristics
SM 18x175 [2xM5] / N42

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	6509 Gs 650.9 mT	170.06 kg / 170063.3 g 1668.3 N	critical level
1 mm	5796 Gs 579.6 mT	134.84 kg / 134836.7 g 1322.7 N	critical level
2 mm	5101 Gs 510.1 mT	104.45 kg / 104446.3 g 1024.6 N	critical level
3 mm	4453 Gs 445.3 mT	79.60 kg / 79602.2 g 780.9 N	critical level
5 mm	3348 Gs 334.8 mT	44.99 kg / 44992.9 g 441.4 N	critical level
10 mm	1667 Gs 166.7 mT	11.16 kg / 11158.1 g 109.5 N	critical level
15 mm	923 Gs 92.3 mT	3.42 kg / 3416.2 g 33.5 N	medium risk
20 mm	568 Gs 56.8 mT	1.29 kg / 1293.9 g 12.7 N	weak grip
30 mm	269 Gs 26.9 mT	0.29 kg / 290.2 g 2.8 N	weak grip
50 mm	98 Gs 9.8 mT	0.04 kg / 38.5 g 0.4 N	weak grip

Pulling power decreases significantly with every mm of distance. Remember that even a very thin break (e.g., contamination, paint, rust) noticeably diminishes the holding power. Neodymiums work strongest at the point of direct contact; gap drastically cuts the power. Observe how rapidly the load capacity fall, when the product does not adhere flatly to the steel surface. When designing the arrangement, avoid additional spacers.

Table 2: Vertical capacity (wall)
SM 18x175 [2xM5] / N42

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	34.01 kg / 34012.0 g 333.7 N
1 mm	Stal (~0.2)	26.97 kg / 26968.0 g 264.6 N
2 mm	Stal (~0.2)	20.89 kg / 20890.0 g 204.9 N
3 mm	Stal (~0.2)	15.92 kg / 15920.0 g 156.2 N
5 mm	Stal (~0.2)	9.00 kg / 8998.0 g 88.3 N
10 mm	Stal (~0.2)	2.23 kg / 2232.0 g 21.9 N
15 mm	Stal (~0.2)	0.68 kg / 684.0 g 6.7 N
20 mm	Stal (~0.2)	0.26 kg / 258.0 g 2.5 N
30 mm	Stal (~0.2)	0.06 kg / 58.0 g 0.6 N
50 mm	Stal (~0.2)	0.01 kg / 8.0 g 0.1 N

The following data calculates the estimated shear load needed to initiate the slippage of the magnet downwards against a upright steel plate (assuming typical friction). This value depends on the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
SM 18x175 [2xM5] / N42

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	51.02 kg / 51019.0 g 500.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	34.01 kg / 34012.7 g 333.7 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	17.01 kg / 17006.3 g 166.8 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	85.03 kg / 85031.6 g 834.2 N

When hanging a element on a vertical surface (e.g., a board), it will maintain only approx. 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip mean that holders slide down faster than they detach. Designing a wall mount? Remember that the sliding force is much weaker than the maximum static pull force. On a painted metal, the magnet will slip down under a significantly smaller weight. Using a rubber layer can significantly improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
SM 18x175 [2xM5] / N42

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	3%	5.67 kg / 5668.8 g 55.6 N
1 mm	8%	14.17 kg / 14171.9 g 139.0 N
2 mm	17%	28.34 kg / 28343.9 g 278.1 N
5 mm	42%	70.86 kg / 70859.7 g 695.1 N
10 mm	83%	141.72 kg / 141719.4 g 1390.3 N

A thin sheet is not enough to conduct the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a thin surface, the magnetism will pass right through and the attraction force will be weaker. To utilize 100% of this neodymium's potential, you need a suitably thick element of metal. The saturation phenomenon causes that on thin elements (e.g., car bodies), the magnet holds weaker. We recommend selecting the steel thickness according to the table below.

Table 5: Working in heat (stability) - thermal limit
SM 18x175 [2xM5] / N42

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	170.06 kg / 170063.3 g 1668.3 N	OK
40 °C	-2.2%	166.32 kg / 166321.9 g 1631.6 N	OK
60 °C	-4.4%	162.58 kg / 162580.5 g 1594.9 N	OK
80 °C	-6.6%	158.84 kg / 158839.1 g 1558.2 N
100 °C	-28.8%	121.09 kg / 121085.1 g 1187.8 N

Standard neodymium magnets lose parameters after exceeding the maximum temperature. Avoid high temperatures – high temperature can permanently destroy this product. With increasing heat, the neodymium's force momentarily drops. Avoid using this magnet near heat sources exceeding its operating temperature limit. Exceeding the critical threshold will result in destruction of magnetic properties.

*Technical advisory: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) risk losing magnetic properties at lower temperatures compared to rod magnets. Red status in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
SM 18x175 [2xM5] / N42

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	2584.89 kg / 2584891 g 25357.8 N 6 516 Gs	N/A
1 mm	2310.89 kg / 2310894 g 22669.9 N 12 309 Gs	2079.80 kg / 2079805 g 20402.9 N ~0 Gs
2 mm	2049.46 kg / 2049462 g 20105.2 N 11 592 Gs	1844.52 kg / 1844516 g 18094.7 N ~0 Gs
3 mm	1808.02 kg / 1808024 g 17736.7 N 10 888 Gs	1627.22 kg / 1627222 g 15963.0 N ~0 Gs
5 mm	1388.28 kg / 1388282 g 13619.1 N 9 541 Gs	1249.45 kg / 1249454 g 12257.1 N ~0 Gs
10 mm	683.87 kg / 683874 g 6708.8 N 6 696 Gs	615.49 kg / 615487 g 6037.9 N ~0 Gs
20 mm	169.60 kg / 169598 g 1663.8 N 3 335 Gs	152.64 kg / 152639 g 1497.4 N ~0 Gs
50 mm	8.77 kg / 8769 g 86.0 N 758 Gs	7.89 kg / 7892 g 77.4 N ~0 Gs

Two magnets interact from a significantly greater distance than a neodymium and metal combination. The setup of magnet-to-magnet produces a massive flux and a further horizon of operation. Want to build a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Remember that when bringing together two magnets, the impact force is massive. The repulsion force is slightly lower than the attraction, but still impressive.
*Field value between like poles reaches ~0 Gs at the midpoint between the magnets (due to field cancellation).

Table 7: Protective zones (implants) - warnings
SM 18x175 [2xM5] / N42

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	20.0 cm
Hearing aid	10 Gs (1.0 mT)	14.5 cm
Mechanical watch	20 Gs (2.0 mT)	11.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	8.0 cm
Remote	50 Gs (5.0 mT)	7.0 cm
Payment card	400 Gs (40.0 mT)	2.5 cm
HDD hard drive	600 Gs (60.0 mT)	2.0 cm

Extremely neodym field poses a real danger to electronics and pacemakers. These NdFeB products generate a field that disrupts operation of digital equipment. Be aware: the unseen radiation penetrates the body and housings. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
SM 18x175 [2xM5] / N42

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	4326.17 km/h (1201.71 m/s)	7.22 J
30 mm	7211.25 km/h (2003.13 m/s)	20.06 J
50 mm	9301.09 km/h (2583.64 m/s)	33.38 J
100 mm	13151.96 km/h (3653.32 m/s)	66.73 J

Neodymium magnets are delicate – a violent impact against metal can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or injury to fingers. Always hold the magnet during mounting so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Anti-corrosion coating durability
SM 18x175 [2xM5] / N42

Technical parameter	Value / Description
Coating type	[NiCuNi] Nickel
Layer structure	Nickel - Copper - Nickel
Layer thickness	10-20 µm
Salt spray test (SST) ?	24 h
Recommended environment	Indoors only (dry)

The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (P_c)
SM 18x175 [2xM5] / N42

Parameter	Value	SI Unit / Description
Magnetic Flux	797 469 Mx	7974.7 µWb
P_c Coefficient	1.70	High (Stable)

Flux value passing through the magnet pole. Key data when building generators as well as sensors. P_c value defines the magnet's operating point.

Parameter (Grade) N42 -20 mm (Total - 20mm) ~ 6 500 Gauss (±5%)

Table 11: Hydrostatics and buoyancy
SM 18x175 [2xM5] / N42

Environment	Effective steel pull	Effect
Air (land)	170.06 kg	Standard
Water (riverbed)	194.72 kg (+24.66 kg Buoyancy gain)	+14.5%

Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.

1. Sliding resistance

*Warning: On a vertical surface, the magnet holds only ~20% of its perpendicular strength.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Thermal stability

*For N38 material, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 1.70

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The P_c (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher P_c value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical and environmental data

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: 130272-2025

Magnet Unit Converter

Force (pull)

Kilograms (kg)

Force (N)

Force in lbs

Magnetic Field

Gauss (Gs)

Induction (T)

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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. 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 filings stick to the surface very strongly, so cleaning requires strength or cleverness. 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. 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 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.

Advantages as well as disadvantages of rare earth magnets.

Pros

Besides their immense pulling force, neodymium magnets offer the following advantages:

Their strength is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
Magnets effectively defend themselves against demagnetization caused by external fields,
A magnet with a smooth gold surface has better aesthetics,
Magnetic induction on the working layer of the magnet turns out to be strong,
Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
Thanks to versatility in designing and the ability to modify to individual projects,
Key role in electronics industry – they are used in computer drives, brushless drives, medical equipment, as well as other advanced devices.
Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:

At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power 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
When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
Limited possibility of creating threads in the magnet and complex forms - recommended is a housing - magnet mounting.
Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these devices can be problematic in diagnostics medical when they are in the body.
With budget limitations the cost of neodymium magnets is a challenge,

Pull force analysis

Maximum holding power of the magnet – what affects it?

The specified lifting capacity refers to the limit force, measured under optimal environment, namely:

with the contact of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
whose transverse dimension equals approx. 10 mm
with a surface perfectly flat
with zero gap (no coatings)
during detachment in a direction perpendicular to the mounting surface
in stable room temperature

Lifting capacity in practice – influencing factors

In practice, the real power is determined by a number of factors, ranked from most significant:

Clearance – the presence of foreign body (rust, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
Material type – the best choice is high-permeability steel. Stainless steels may attract less.
Surface condition – ground elements guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets

Allergic reactions

Studies show that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, avoid touching magnets with bare hands and opt for encased magnets.

Danger to the youngest

These products are not toys. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which constitutes a critical condition and requires immediate surgery.

GPS and phone interference

Navigation devices and smartphones are extremely sensitive to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Protect data

Data protection: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, timepieces).

Mechanical processing

Dust created during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Implant safety

People with a ICD should keep an safe separation from magnets. The magnetic field can stop the functioning of the implant.

Risk of cracking

Protect your eyes. Magnets can explode upon violent connection, launching shards into the air. Eye protection is mandatory.

Serious injuries

Risk of injury: The attraction force is so great that it can cause blood blisters, crushing, and even bone fractures. Use thick gloves.

Do not underestimate power

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

Heat warning

Avoid heat. Neodymium magnets are susceptible to temperature. If you need resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Important! Want to know more? Read our article: Are neodymium magnets dangerous?

SM 18x175 [2xM5] / N42 - magnetic separator

Technical of the product - SM 18x175 [2xM5] / N42 - magnetic separator

Magnetic properties of material N42

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the magnet - technical parameters

Table 1: Static pull force (force vs gap) - characteristics SM 18x175 [2xM5] / N42

Table 2: Vertical capacity (wall) SM 18x175 [2xM5] / N42

Table 3: Wall mounting (sliding) - behavior on slippery surfaces SM 18x175 [2xM5] / N42

Table 4: Steel thickness (substrate influence) - sheet metal selection SM 18x175 [2xM5] / N42

Table 5: Working in heat (stability) - thermal limit SM 18x175 [2xM5] / N42

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system SM 18x175 [2xM5] / N42

Table 7: Protective zones (implants) - warnings SM 18x175 [2xM5] / N42

Table 8: Dynamics (kinetic energy) - warning SM 18x175 [2xM5] / N42

Table 9: Anti-corrosion coating durability SM 18x175 [2xM5] / N42

Table 10: Electrical data (Pc) SM 18x175 [2xM5] / N42

Table 11: Hydrostatics and buoyancy SM 18x175 [2xM5] / N42

1. Sliding resistance

2. Plate thickness effect

3. Thermal stability

4. Demagnetization curve and operating point (B-H)

Elemental analysis

Sustainability

Force (pull)

Magnetic Field

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Advantages as well as disadvantages of rare earth magnets.

Pros

Limitations

Pull force analysis

Maximum holding power of the magnet – what affects it?

Lifting capacity in practice – influencing factors

Safety rules for work with NdFeB magnets

Allergic reactions

Danger to the youngest

GPS and phone interference

Protect data

Mechanical processing

Implant safety

Risk of cracking

Serious injuries

Do not underestimate power

Heat warning

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs gap) - characteristics
SM 18x175 [2xM5] / N42

Table 2: Vertical capacity (wall)
SM 18x175 [2xM5] / N42

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
SM 18x175 [2xM5] / N42

Table 4: Steel thickness (substrate influence) - sheet metal selection
SM 18x175 [2xM5] / N42

Table 5: Working in heat (stability) - thermal limit
SM 18x175 [2xM5] / N42

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
SM 18x175 [2xM5] / N42

Table 7: Protective zones (implants) - warnings
SM 18x175 [2xM5] / N42

Table 8: Dynamics (kinetic energy) - warning
SM 18x175 [2xM5] / N42

Table 9: Anti-corrosion coating durability
SM 18x175 [2xM5] / N42

Table 10: Electrical data (P_c)
SM 18x175 [2xM5] / N42

Table 11: Hydrostatics and buoyancy
SM 18x175 [2xM5] / N42