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MW 29.9x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010052

GTIN/EAN: 5906301810513

Diameter Ø

29.9 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

52.66 g

Magnetization Direction

→ diametrical

Load capacity

21.50 kg / 210.90 N

Magnetic Induction

344.60 mT / 3446 Gs

Coating

[NiCuNi] Nickel

technical specifications »

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Technical - MW 29.9x10 / N38 - cylindrical magnet

Specification / characteristics - MW 29.9x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010052
GTIN/EAN 5906301810513
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 29.9 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 52.66 g
Magnetization Direction → diametrical
Load capacity ~ ? 21.50 kg / 210.90 N
Magnetic Induction ~ ? 344.60 mT / 3446 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 29.9x10 / N38 - cylindrical magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
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

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

Technical analysis of the assembly - technical parameters

The following values are the result of a engineering simulation. Values rely on models for the class Nd2Fe14B. Operational performance may differ from theoretical values. Treat these data as a reference point for designers.

Table 1: Static force (force vs gap) - power drop
MW 29.9x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3445 Gs
344.5 mT
 21.50 kg / 47.40 LBS
21500.0 g / 210.9 N
 dangerous!
1 mm 3261 Gs
326.1 mT
 19.26 kg / 42.45 LBS
19256.6 g / 188.9 N
 dangerous!
2 mm 3059 Gs
305.9 mT
 16.95 kg / 37.36 LBS
16947.4 g / 166.3 N
 dangerous!
3 mm 2848 Gs
284.8 mT
 14.70 kg / 32.40 LBS
14696.2 g / 144.2 N
 dangerous!
5 mm 2425 Gs
242.5 mT
 10.65 kg / 23.48 LBS
10650.1 g / 104.5 N
 dangerous!
10 mm 1519 Gs
151.9 mT
 4.18 kg / 9.21 LBS
4178.4 g / 41.0 N
 strong
15 mm 930 Gs
93.0 mT
 1.57 kg / 3.45 LBS
1565.8 g / 15.4 N
 low risk
20 mm 583 Gs
58.3 mT
 0.62 kg / 1.36 LBS
616.0 g / 6.0 N
 low risk
30 mm 258 Gs
25.8 mT
 0.12 kg / 0.27 LBS
121.0 g / 1.2 N
 low risk
50 mm 76 Gs
7.6 mT
 0.01 kg / 0.02 LBS
10.4 g / 0.1 N
 low risk
Grip strength weakens drastically with every subsequent millimeter of gap. Keep in mind that every additional insulation layer (e.g., dirt, paint, rust) strongly weakens the grip. Magnetic products work strongest at the point of direct contact; gap kills the force. Notice how flashily the load capacity fall, when the product does not adhere tightly to the steel surface. When planning the assembly, discard unnecessary gaps.

Table 2: Shear load (wall)
MW 29.9x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.30 kg / 9.48 LBS
4300.0 g / 42.2 N
1 mm Stal (~0.2) 3.85 kg / 8.49 LBS
3852.0 g / 37.8 N
2 mm Stal (~0.2) 3.39 kg / 7.47 LBS
3390.0 g / 33.3 N
3 mm Stal (~0.2) 2.94 kg / 6.48 LBS
2940.0 g / 28.8 N
5 mm Stal (~0.2) 2.13 kg / 4.70 LBS
2130.0 g / 20.9 N
10 mm Stal (~0.2) 0.84 kg / 1.84 LBS
836.0 g / 8.2 N
15 mm Stal (~0.2) 0.31 kg / 0.69 LBS
314.0 g / 3.1 N
20 mm Stal (~0.2) 0.12 kg / 0.27 LBS
124.0 g / 1.2 N
30 mm Stal (~0.2) 0.02 kg / 0.05 LBS
24.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
The table below shows the theoretical force sufficient to initiate the slippage of the magnet downwards against a vertical steel wall (assuming standard friction coefficient). This value varies with the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MW 29.9x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
6.45 kg / 14.22 LBS
6450.0 g / 63.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.30 kg / 9.48 LBS
4300.0 g / 42.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.15 kg / 4.74 LBS
2150.0 g / 21.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
10.75 kg / 23.70 LBS
10750.0 g / 105.5 N
When mounting a magnet on a vertical wall (e.g., a car body), it will maintain only about 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip mean that magnets slip easier than they pop off the substrate. Designing a vertical fastening? Note that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the magnet will slip down under a significantly smaller weight. Application of an anti-slip coating can effectively raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 29.9x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.08 kg / 2.37 LBS
1075.0 g / 10.5 N
1 mm
13%
 2.69 kg / 5.92 LBS
2687.5 g / 26.4 N
2 mm
25%
 5.38 kg / 11.85 LBS
5375.0 g / 52.7 N
3 mm
38%
 8.06 kg / 17.77 LBS
8062.5 g / 79.1 N
5 mm
63%
 13.44 kg / 29.62 LBS
13437.5 g / 131.8 N
10 mm
100%
 21.50 kg / 47.40 LBS
21500.0 g / 210.9 N
11 mm
100%
 21.50 kg / 47.40 LBS
21500.0 g / 210.9 N
12 mm
100%
 21.50 kg / 47.40 LBS
21500.0 g / 210.9 N
A too thin steel is incapable of absorb the entire magnetic field, which squanders power of the holder. Should you attach a powerful product to a weak sheet, the field will penetrate right through and the pull force will drop sharply. To squeeze the maximum of this magnet's power, you need a suitably thick element of steel. The saturation phenomenon causes that on sheet metal structures (e.g., appliance housings), the product works worse. We recommend selecting the steel cross-section based on the following data.

Table 5: Thermal resistance (material behavior) - thermal limit
MW 29.9x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 21.50 kg / 47.40 LBS
21500.0 g / 210.9 N
 OK
40 °C -2.2% 21.03 kg / 46.36 LBS
21027.0 g / 206.3 N
 OK
60 °C -4.4% 20.55 kg / 45.31 LBS
20554.0 g / 201.6 N
80 °C -6.6% 20.08 kg / 44.27 LBS
20081.0 g / 197.0 N
100 °C -28.8% 15.31 kg / 33.75 LBS
15308.0 g / 150.2 N
Standard neodymium magnets change their properties power above the temperature limit. Avoid high temperatures – excessive heat can irreversibly damage this magnet. As the temperature rises, the magnet's force briefly decreases. Avoid using this magnet near heat sources higher than its operating temperature limit. Ignoring the limit will cause permanent loss of magnetic properties.
*Technical advisory: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) are more susceptible to demagnetization under lower heat stress than long magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field collision
MW 29.9x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 51.38 kg / 113.28 LBS
4 963 Gs
7.71 kg / 16.99 LBS
7708 g / 75.6 N
 N/A
1 mm 48.76 kg / 107.50 LBS
6 712 Gs
7.31 kg / 16.12 LBS
7314 g / 71.7 N
 43.88 kg / 96.75 LBS
~0 Gs
2 mm 46.02 kg / 101.46 LBS
6 521 Gs
6.90 kg / 15.22 LBS
6903 g / 67.7 N
 41.42 kg / 91.32 LBS
~0 Gs
3 mm 43.26 kg / 95.37 LBS
6 322 Gs
6.49 kg / 14.31 LBS
6489 g / 63.7 N
 38.93 kg / 85.83 LBS
~0 Gs
5 mm 37.78 kg / 83.30 LBS
5 909 Gs
5.67 kg / 12.49 LBS
5667 g / 55.6 N
 34.00 kg / 74.97 LBS
~0 Gs
10 mm 25.45 kg / 56.11 LBS
4 850 Gs
3.82 kg / 8.42 LBS
3818 g / 37.5 N
 22.91 kg / 50.50 LBS
~0 Gs
20 mm 9.99 kg / 22.02 LBS
3 038 Gs
1.50 kg / 3.30 LBS
1498 g / 14.7 N
 8.99 kg / 19.81 LBS
~0 Gs
50 mm 0.63 kg / 1.38 LBS
761 Gs
0.09 kg / 0.21 LBS
94 g / 0.9 N
 0.56 kg / 1.24 LBS
~0 Gs
60 mm 0.29 kg / 0.64 LBS
517 Gs
0.04 kg / 0.10 LBS
43 g / 0.4 N
 0.26 kg / 0.57 LBS
~0 Gs
70 mm 0.14 kg / 0.32 LBS
364 Gs
0.02 kg / 0.05 LBS
22 g / 0.2 N
 0.13 kg / 0.28 LBS
~0 Gs
80 mm 0.08 kg / 0.17 LBS
265 Gs
0.01 kg / 0.03 LBS
11 g / 0.1 N
 0.07 kg / 0.15 LBS
~0 Gs
90 mm 0.04 kg / 0.09 LBS
198 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
 0.04 kg / 0.08 LBS
~0 Gs
100 mm 0.02 kg / 0.05 LBS
152 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
Two magnets interact from a significantly greater distance than a magnet and steel combination. The setup of two magnets creates a more powerful interaction and a wider radius of action. Designing a strong closure? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the collision energy is massive. The repulsion force is marginally weaker than the attraction, but still impressive.
*Flux density between like poles reaches ~0 Gs in the exact middle of the gap (due to field cancellation).
* Figures show shear force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - warnings
MW 29.9x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.5 cm
Hearing aid 10 Gs (1.0 mT) 11.0 cm
Timepiece 20 Gs (2.0 mT) 8.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Car key 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Powerful magnet radiation is a large risk to IT equipment as well as medical implants. These NdFeB products produce a flux that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and glass. Increased vigilance must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MW 29.9x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.72 km/h
(6.31 m/s)
 1.05 J
30 mm 35.42 km/h
(9.84 m/s)
 2.55 J
50 mm 45.58 km/h
(12.66 m/s)
 4.22 J
100 mm 64.44 km/h
(17.90 m/s)
 8.44 J
Neodymium magnets are very brittle – a strong collision with metal causes immediate chipping. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or dangerous crushing to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when working with powerful specimens.

Table 9: Coating parameters (durability)
MW 29.9x10 / N38

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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MW 29.9x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 25 588 Mx 255.9 µWb
Pc Coefficient 0.44 Low (Flat)
Flux value passing through the magnet pole. Key data in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Submerged application
MW 29.9x10 / N38

Environment Effective steel pull Effect
Air (land) 21.50 kg Standard
Water (riverbed) 24.62 kg
(+3.12 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Note: On a vertical wall, the magnet retains merely a fraction of its max power.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) severely reduces the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.44

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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 Pc (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 Pc 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
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%
Ecology and recycling (GPSR)
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: 010052-2026
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The presented product is a very strong rod magnet, produced from durable NdFeB material, which, with dimensions of Ø29.9x10 mm, guarantees optimal power. This specific item boasts an accuracy of ±0.1mm and industrial build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 21.50 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 210.90 N with a weight of only 52.66 g, this rod is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 29.9.1 mm) using epoxy glues. To ensure long-term durability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø29.9x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 29.9 mm and height 10 mm. The value of 210.90 N means that the magnet is capable of holding a weight many times exceeding its own mass of 52.66 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 29.9 mm. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Pros and cons of rare earth magnets.

Pros

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
  • Magnets effectively protect themselves against loss of magnetization caused by foreign field sources,
  • By covering with a reflective coating of silver, the element has an elegant look,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • 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...
  • Thanks to the potential of precise forming and customization to specialized requirements, magnetic components can be created in a wide range of geometric configurations, which makes them more universal,
  • Significant place in advanced technology sectors – they are used in hard drives, brushless drives, precision medical tools, as well as complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • 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
  • Limited possibility of creating threads in the magnet and complicated shapes - preferred is cover - magnet mounting.
  • Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum holding power of the magnet – what affects it?

The lifting capacity listed is a measurement result performed under the following configuration:
  • using a base made of mild steel, serving as a ideal flux conductor
  • with a cross-section of at least 10 mm
  • characterized by even structure
  • under conditions of no distance (surface-to-surface)
  • during detachment in a direction perpendicular to the mounting surface
  • at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

During everyday use, the actual lifting capacity is determined by a number of factors, ranked from the most important:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Base massiveness – too thin sheet does not close the flux, causing part of the power to be wasted to the other side.
  • Steel grade – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Surface structure – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity was assessed with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets
Crushing risk

Mind your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Adults only

Only for adults. Small elements pose a choking risk, causing severe trauma. Store away from kids and pets.

Combustion hazard

Combustion risk: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.

Cards and drives

Intense magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Do not underestimate power

Use magnets consciously. Their immense force can surprise even experienced users. Stay alert and respect their power.

Fragile material

Watch out for shards. Magnets can explode upon uncontrolled impact, launching shards into the air. We recommend safety glasses.

Pacemakers

People with a heart stimulator should keep an safe separation from magnets. The magnetism can interfere with the functioning of the implant.

Nickel coating and allergies

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If skin irritation appears, cease handling magnets and wear gloves.

Power loss in heat

Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. Damage is permanent.

Phone sensors

Note: neodymium magnets produce a field that confuses sensitive sensors. Keep a separation from your phone, device, and GPS.

Safety First! Learn more about hazards in the article: Magnet Safety Guide.