8kg. In terms of raw magnetic strength, neodymium magnets often outshine other types. They are from the Rare-Earth magnet family and have the highest magnetic properties of all permanent magnets, stronger than Samarium Cobalt (SmCo), Alnico and Ferrite. x 0. Historically, Neodymium reached an all time high of 1520000. To put the power of two. Composed of neodymium, iron & boron, these strong permanent magnets are the most powerful class of magnet materials. The magnet is made of N45 Grade Neodymium which gives it even stronger. 004” to 0. W. This disc magnet has the power of N35 grade neodymium alloy and promises durability, consistency, and powerful magnetic strength. Although the maximum possible energy product is calculated in to be N64, it is unlikely such high strengths of Neodymium will be achievable in the near future. Let's walk through a few examples to illustrate how to use these charts, and what it all means. For example, a neodymium magnet of grade N42 has a strength of 42MGOe. To put the power of two. Our business aims to operating faithfully, serving to all of our clients , and working in new technology and new machine continuously for Neodymium Magnet Strength Rating, Dc Neodymium Magnet Motor, Can You. Magnetic strength is most commonly measured in two ways: grade and. The number comes from an actual material property, the Maximum Energy Product of the magnet material, expressed in MGOe (Mega Gauss Oersteds). Even this can generate a force of over 1700 grams (3. 38 lb. We offer sintered neodymium magnets in grades ranging from N33 to N53. NdFeB Magnet. Neodymium magnets in the UK are the strongest commercially available magnets, meaning that they can lift objects many times their weight. The grade N42 means a neodymium magnet has a maximum energy product of 42 MGOe. The magnetic properties of the various grades of neodymium magnets are adjusted by using varying amounts of rare earth elements in the alloy mixture, with each element adjusting the. These magnets are widely used in products like microphones, professional loudspeakers, in-ear headphones, high-performance hobby DC electric motors, and computer hard disks, where low magnet mass (or volume) or strong magnetic fields. There are other N ratings of neodymium magnets. This is about 200 times the strength of the Earth’s magnetic field. 07046 - N35¸ 0. They were developed in the 1950s and have since become popular for many applications due to their affordability and durability. Neodymium magnets are permanent magnets (i. What is the pull force of N35 grade neodymium magnets? 1. Around 10% of permanent magnets (4 kt neodymium) were used for wind turbines, notably offshore turbines and Chinese onshore turbines. 10-100. Temp. Description. 25 D and the distance from the pole face (X) is 100% D. (mm)Manufacturing Methods & Finishes. Gap: This Gap Calculator estimates the magnetic field strength between two neodymium magnets separated by a small gap. It is the most commonly used neodymium magnets among N rating. Waterproof hook magnet, great for hanging decor. In every wind turbine and generator you will find one or more incredibly strong magnets. More Magnetic Strength. After cooling, most of the magnetic force can return to the original level, which is reversible. Add To Cart. by other permanent magnet shapes such as a disc of the same diameter. 4. Previously, grades of ferrite magnets where labelled with the letter ‘C’ then a number, for example C1, C2, C3. These ferrite magnets have a medium magnetic strength ratio and they can be used at high temperatures. 50" W x 0. Magnetic induction B (also known as magnetic flux density) has the SI unit tesla [T or Wb/m 2 ]. The north pole is indicated in red, and the south pole in indicated in gray. In fact, according to. 00 in February of 2022. Neodymium is the strongest type of permanent magnets, samarium cobalt is. OK. A round neodymium magnet with a diameter of 15mm and a thickness of 4mm has a pull force of about 2. Only this friction force keeps the magnet from sliding down the face of the refrigerator door. To clarify the power of the world's strongest magnet, a strong refrigerator magnet is 100 gauss. A rare earth magnet is a magnet made from one of the rare earth elements (of which there are 17) in the Lanthanide series of metals in the periodic table. + Moderate Mechanical Strength. When designing a magnetic solution, physical strength is not always the most important factor and each material has its own unique. 0. N38 – Low-grade neodymium magnet. Besides, in 10 years, a neodymium magnet might not lose up to 10% of its strength. With a few assumptions, flux density (in Gauss) can be related to the expected pull force. BROWSE CATALOG. In comparison to other types of magnets, rare earth magnets or neodymium magnets have a higher magnetic strength. Our collection of small and large Neodymium magnets are susceptible to demagnetization at elevated temperatures. Depending on the grade of the magnet, the heat will demagnetize the magnet. Most of our magnets are grade N42 or above. The following number comes from an actual material property, the Maximum Energy. Neodymium magnets are certainly usable at these low temperatures, but the loss in strength below -150°C should be planned for. Neodymium Magnets Products are divided into two major categories: Sintered Neodymium Magnet and. Be aware that standard neodymium magnets will lose strength if heated over 178°F. fastest shipping! No Minimum Order! K&J Magnetics, Inc. 59 for 1 to 99 items. Buy neodymium magnets in over 250 different shapes and sizes, including strong N42, N52, and N55 magnets. A Magnetic field is an invisible flux moving from one end of the magnet to the other, as shown in Figure 1. 0kg/mm²Factors Affecting the Strength of Neodymium Magnets Magnet Size. Meanwhile it shows how resistant it is to demagnetize, how a magnet’s shape affects. The number that follows is a little more technical because it represents the maximum energy. Neodymium magnets (NdFeB) are super strong and are the strongest rare earth permanent magnets available. 20. Compression Strength: 950 MPa (137,800 psi) Tensile Strength: 80 MPa (11,600 psi) Vickers Hardness (Hv) 560-600: Young's Modulus: 160 GPa (23,200 ksi) Recoil. Higher values mean stronger magnets. 2lbs (with a ½” ferrous ball) and can be purchased in square and round options. They are also great to be used as magnet fasters for. While N52 magnets have a strength of 52 MGOe, a magnet made to work in any direction might only achieve 10-12 MGOe. 1 15 10 Compressive 700 Tensile 35 Young's modulus (GPa) 200equations or charts; for example, see Rollin J. This magnetic power is known as maximum energy product / MGOe (Mega Gauss Oesteds). Neodymium Badge Magnets w/Adhesive Back. We will work with you to understand the operating parameters and whether a Neodymium magnet or other one constructed of another material is best suited for your needs. The neodymium magnets in a typical EV weigh up to 3kg (6 lb), but even at 1/12th of that weight, a neodymium magnet can support steel as heavy as prizefighter Tyson Fury, and will have about 18. Magnetic field drops off as the cube of the distance from a dipole source. e. Grade magnets 1st anchor chart 2nd science magnet activities. Demagnetization Curve. The major application of neodymium is in high-strength. When classifying neodymium magnets according to their magnetic strength, the grades come into view. All Pull Force values based on extensive testing in our laboratory. Developed in the 1970s and 1980s, rare-earth magnets are the strongest type of permanent magnets made, producing significantly stronger magnetic fields than other types such as ferrite or alnico magnets. 26 inch x 1/8 inch, Pack of 12. e. berkhamsted@buntingmagnetics. Salt Spray testing conducted with a 5% NaCl solution, at. The strongest permanent magnets in the world are neodymium (Nd) magnets, they are made from magnetic material made from an alloy of neodymium, iron and boron to form the Nd 2 Fe 14 B structure. Neodymium magnets in the UK are the strongest commercially available magnets, meaning that they can lift objects many times their weight. magnet pull strength: Exposing magnets to high temperatures outside their design range may cause magnets to fail completely or show signs of weakening. According to a study published in the Journal of Magnetism and Magnetic Materials, neodymium magnets typically have a magnetic energy density between 30 and 50. 49. com, we do not compromise on quality and the majority of our magnets are grade N42 or above, making them 20% more magnetic than many cheaper N35 grade neodymium magnets. Looking at the purple line on the graph, it is a little bit hard to read at 100% D but the magnetic field would be about 2% of the Residual value. K&J Magnetics, Inc. A rare earth magnet is a magnet made from one of the rare earth elements (of which there are 17) in the Lanthanide series of metals in the periodic table. 5 times Ferrite magnets). The grades that can usually be purchased range from N30 to N52, because low-grade neodymium magnets are usually no longer produced. 3. N42 is not as strong as N52, for example. 5 products. Our magnets are often used in oil pans, on oil filters or elsewhere to filter metal chips out of oil. References. Get in Touch to Discuss Your Application. Characteristics: Not as brittle as SmCo, but should not be used at temperatures above 300°F, without. 10% Off. 5 Teslas. New York, United States , June 27, 2023 (GLOBE NEWSWIRE) -- The Global Neodymium Magnet Market Size is to grow from USD 2. The grades of. If magnetism is inherent, the size. With proper care and protection, neodymium magnets can last for many years or even decades, retaining a significant portion of their original magnetic strength. Huge inventory, fast shipping. Never use clips or pins to hold that badge to your garments again! Our magnetic badge holders will not damage your clothing and are easy to use!!Thickness (Inches) – Direction of Magnetization: Calculate Result. 947. 439 products. kA/M. Despite their mega strength, Neodymium magnets are considered to have a low maximum temperature resistance. This number is a material property which is independent of the magnet shape. 3mm dia x 2mm thick N42 Neodymium Magnet - 0. They have an elaborate manufacturing process of vacuum melting, milling, pressing and sintering. When classifying neodymium magnets according to their magnetic strength, the grades come into view. Fill in all of the blank calculation fields, click the calculate button and the results will appear. If they break apart, the small pieces can be a choking hazard. Often measured in. The necessary. $1. Magnet Applications. WARNING: KEEP OUT OF REACH OF CHILDREN. F335-N52. At Stanford Magnets, we do not make any compromises on quality. The magnetic field of a neodymium magnet can reach up to. The grade without suffix letter has maximum operating temperature 80°C, however N52 & N55 (the highest. This neodymium magnet achieved the world's highest levels of residual magnetic flux density Br, intrinsic coercive force H. 70 per kg on Jan 1st 2021 it has increased +13. $2. The resultant space efficiency is a major advantage in modern, minimalist speaker designs where space is at a premium. In one tesla-unit there is 10. Different designs call for different grades of magnets. 2 Neodymium iron boron (NdFeB) magnets: These are the most powerful. Neodymium compounds are of low to moderate toxicity, yet its toxicity has not been thoroughly investigated. Boots horse mountain sovereign riding rider tall equestrian ladiesMountain horse winter boot collection – mountain horse usa Buy mountain horse vermont lace tall bootHorse boot size chart. 2 °C; −425. Good in ambient temperature. 12 hours. Neodymium iron boron (NdFeB), or “neo” magnets offer the highest energy product of any material today and are available in a wide range of shapes, sizes and grades. Strength magnets neodymium safety info neodymium cylindrical neodymium strength magnet neodymium grades magnetic reference properties following table their neodymium magnets carolina neodymium thicker. Add to cart. Alnico magnets are permanent magnets made of aluminum, nickel, and cobalt. The pull strength a neodymium magnet can achieve is the strongest of the permanent magnets you can buy. In this case, the N52 magnet is stronger than the N35 magnet. Getting started; neodymium magnets strength; neodymium magnets strength - Manufacturers, Suppliers, Factory from China We have now numerous great personnel members good at advertising, QC, and working with kinds of troublesome dilemma from the creation course of action for neodymium magnets strength, Irregular Motor Magnets,. Magnets come in many strengths, and you can use a gauss meter to determine the strength of a magnet. 44 for 1 to 9 items. magnets tumbled (honed) to create a slight radius (0. Neodymium magnets are typically composed of one -third neodymium, along with iron and boron. Neodymium magnets were first produced in response to the high price of samarium-cobalt magnets, giving need to identify an economical, high. Material corrodes easily and should be coated (plated) for long-term maximum energy output. Due to their high magnetic strength and relatively low-cost, neodymium magnets are. They are over 10 times stronger than the strongest ceramic magnets. Fish stirring bars out of containers using the magnetic end of these retrievers. Permanent magnets are graded by the maximum energy the magnet produces. The main ingredients of a neodymium magnet are neodymium itself, iron, and boron; the chemical compound known as NdFeb. For maximum energy product, convert megaGaussOersteds (MGOe) to. This disc magnet has the power of N35 grade neodymium alloy and promises durability, consistency, and powerful magnetic strength. Sharp edges from grinding or slicing and dicing magnets are more fragile and have an increased tendency to chip. This data sheet covers the standard production range of NdFeB magnets (currently 55 grades) that are commonly. About the Author. 180-750. They are high in magnetic strength, moderately priced and able to perform well in. They are assigned the values 35, 38, 40, 42, 45, 48, 50. Neodymium magnets are considered part of the family of rare earth magnets because their main element is the rare earth. 302-326. Key Features: Material: Premium N35 Neodymium. They are made from inexpensive raw materials and are very economical to produce. Neodymium Magnets from Master Magnetics, the Magnet Source. Despite offering substantial magnetic strength, they still fall short compared to neodymium magnets. Neodymium magnets are graded by their maximum energy product (BH)max with N52 grade neodymium providing the greatest magnetic performance and N35 being the weakest. Magnetized. Traditionally, magnetizing field H, is measured in amperes per meter. Magnetic Field Calculator. The grade is a good indicator of the strength of a magnet. Remember to follow safety precautions when handling these powerful. Roughly 2/3 of a neodymium magnet is composed of iron. Neodymium N38 Countersunk Ring Magnets – 15x5x5mm 9MAGNR15X10. It is also the most commonly used rare earth magnet. The fragments that come off can stick magnetically back onto the magnet creating a “dirty” magnet. Compared with many cheaper N35 grade neodymium magnets, their magnetism is. Key Features: Material: Premium N35 Neodymium. Measurements taken off the center axis will vary. This tool calculates magnetic field strength measured in gauss, on the centerline of a disc magnet or ring magnet magnetized through its thickness, at a distance of X from the surface of the magnet. Neodymium (Nd), chemical element, a rare-earth metal of the lanthanide series of the periodic table. The thickness of flexible magnetic sheets usually ranges from 0. I. Besides the relatively lower Curie temperature, Nd 2 Fe 14 B is an. Additionally, these particles have a magnetic anisotropy of 4. The “N” represents “neodymium,” while the number “52” indicates that the magnet has a maximum energy product of 52 Mega-Gauss-Oersteds (MGOe). Neodymium magnets are rare-earth magnet materials with the highest magnetic properties. –. Generally speaking, neodymium magnets range from N35 to N55 in grade. Magnetic characteristics distribution charts of FB Series Transition of material group development. Magnet neodymium magnets temperature chart strength magnetic low performance n52 rare earth temperaturesNeodymium magnet grades Neodymium magnets grades permanentSafety info – magneticpoetry. This huge difference means that the N52 magnets have around 49% more energy than that of the N35 magnets. Careful measurements with a fluxmeter noted the total magnetic moment of each magnet. 375 inches in diameter byAdjust the scale to zero to cancel the weight of the test piece and spacer. A 3-tesla magnetic field. 55. 5/cm³ Vickers Hardness 600Hv Tensile Strength 8. • Relatively easy to machine, compared to Alnico and SmCo magnets. Inspection Mirrors. Most come in round shapes, but we also offer a few Rectangular Mounting Magnets. 472'' Dia. The magnetic moment of a substance can be calculated based on whether the substance is an inherent magnetic field or a magnetic field caused by an electric current. 8" Long X 1/2" Wide X 5/32"Thick. 07046 - N35¸ 0. Christianity vs. This magnetic power is known as maximum energy product / MGOe (Mega Gauss Oesteds). See moreTechnical information about different grades of super strong neodymium magnets. Neodymium is the strongest type of permanent magnets, samarium cobalt is the second strongest. The Neo magnets are less brittle than SmCo. Generally speaking, higher grade numbers indicate a stronger or more powerful magnet. they generate their own magnetic field) made from an alloy of the metallic elements neodymium, iron and boron. Neodymium magnets are rare-earth magnet materials with the highest magnetic properties. There are four main types of permanent magnets – neodymium, samarium cobalt, alnico and ferrite. Master Magnetics is your Magnet Source for Neodymium Rare Earth Magnets. The 12,000 Gauss neodymium grate magnet option has a pull strength of 13. AMF Magnets USA has a range of Neodymium Magnets in various grades from N30 to N52 and with heat tolerances from 80° to 200°C. + Highest Energy of All Permanent Magnets. They are widely used as. Of Br −0. On returning to normal operating temperatures below 176 degrees F, there is an irreversible loss in magnetic strength and permanent damage. A higher grade number indicates a higher magnetic strength. Each individual layer of Nickel and Copper are 5-7 μm thick. com, we do not compromise on quality, the majority of our magnets are grade N42 or above, making them 20% more. Inhalation overexposure of iron dust may cause siderosis, a benign pneumoconiosis. The Original K&J Magnet Calculator. The magnet is 0. The magnetic field is the tendency for a magnetic force to be induced on moving charged particles in the presence of these. Neo magnets can be found in a variety of applications including high performance motors, brushless DC motors, magnetic separation, magnetic resonance imaging, sensors, switches. Choose from our selection of round magnets, including neodymium magnets, encased neodymium magnets, and more. Check out our full collection here. The Relationship between the Working Temperature and the Curie Temperature of a Magnet. The compound also has a high saturation. Better performance than 2x1x1/2" magnets 22. It is a method of measuring a magnet’s max strength & the limit of that magnet’s holding power. If you measure the one you have (or the pocket the missing one used to occupy), you can probably find that size online pretty easily. This small loss is fully recoverable on cooling, providing that the maximum operating temperature is not exceeded. Sintered Neodymium-Iron-Boron Magnets. All Surface Field values are at the magnet surface, in the center of the axis of magnetization. FB13B, FB14H : High-performance / thin-shaped molding materials. Dimensions: 1. Discover each grades magnetic properties. These 15mm diameter 5mm thick Neodymium N38. Magnetic sheets are produced using a calendering process; most tend to be 24 inches (610mm) wide with a length of up to 98 feet (30 m). Price - Chart - Historical Data - News. 75 pounds). Neodymium magnets were first developed in 1982 by General Motors and Sumitomo Special Metals following the formulation of the alloy NdFeB, which is made of neodymium as well as iron and boron. The distance between the magnets and the track rails is significant because the downforce is proportional to the square of the distance between them. 15 for 10 to 99 items and save 20%. Two D84 disc magnets repel one another, but must be constrained in the tube for stability. christian beliefs. 6 Neodymium magnets are also used in wind turbines, aeronau cs and space. A ferrite or ceramic magnet usually creates a weak. 03 inches (0. This magnet produced from rare earth. Remagnetize with a Strong Permanent Magnet: Follow these steps to remagnetize your magnet using a strong permanent magnet: a. Pull the scale upward very slowly while maintaining a perpendicular angle. Historically, Neodymium reached an all time high of 1520000 in February of 2022. A rare-earth magnet is a strong permanent magnet made from alloys of rare-earth elements. Magnet grade is the Arabic numerals used to distinguish the different properties. Neodymium magnets are available in a wide variety of grades such as N42, N52 and N42SH. Samarium Cobalt Block Magnet. Not only are they more potent, but they are also more compact, offering superior performance in a smaller package—a. 20mm O. Magnet physical properties is a good reference value when you choosing a magnet material from NdFeB, SmCo, AlNiCo and Ferrite Magnets. A magnetic bracelet using 20 - 5mm 3000 gauss magnets that are 2 mm thick will be 25% stronger than the same bracelet with 1. From £4. kA/M. Measuring Magnetic Field Strength of Neodymium Magnets Using a Gaussmeter. Price. Ferrofluid on glass, with a rare-earth magnet underneath. Alnico magnets come in several variations with different amounts of aluminum, nickel, and cobalt. The strongest magnet ever constructed weighed 34 tons and was 22 feet tall. F294. Characteristic: Units; C // C. Neodymium magnets are a combination of Neodymium (Nd), Iron (Fe) and Boron (B), and are also referred to as NdFeB or Neo. The main phase of Neodymium magnet is Nd 2 Fe 14 B and maximum energy products achieved 280kJ/m 3 at that time. 04% in value. 5 times Ferrite magnets). Nolen (National Superconducting Cyclotron Laboratory, 09/87) demonstrated SmCo having a better performance, with Sm 2 Co 17 offering 2-40 times. Neodymium Grades. Master Magnetics is your Magnet Source for Neodymium Rare Earth Magnets. For magnetic flux density and magnetic induction (B), convert Gauss (G) to Tesla (T). Demagnetization curve is a very important indicator of magnetic characteristic. Our site includes a history of magnets , a glossary of magnetic terms used. 10-100. 5 °F). This gives the compound the potential to have high coercivity (i. This calculator only considers discs and cylinders that are magnetized along the cylindrical axis. Each magnet has a grade, which typically denotes its strength. For magnetic flux density and magnetic induction (B), convert Gauss (G) to Tesla (T). Check Price On Amazon (USA, CA, & UK) - Click Here. pull. Generally speaking, higher grade numbers indicate a stronger or more powerful magnet. The available standard neodymium grades are N35, N38, N40, N42, N45, N48, N50, N52 and N55. Anti-lock brake sensors – If you have anti-lock brakes in your car, they utilize neodymium magnets wrapped inside copper coils in their sensors. )The following are the pulling force of some commonly used N35 magnets for reference. Just put two neodymium magnets with opposite magnetic poles on both sides, place some objects in the middle of the two magnets, and then release the two magnets to test the. Set of small size neodymium magnet disk of 1 mm x 1 mm made from the world's strongest magnet grade N52 to create micro actuators. Each one is unique, and there’s no simple formula for translating a system from one magnet type into the system for another. This force only increases with the magnet’s size. Grades of ndfeb magnetsBuy strong neodymium magnets,rare earth magnets,n52 magnets reviews Magnet grade grades magnets neodymium strong rare earth strength n52 temperature strongest reviews buy should chooseGrades magnets teachersparadise. And it is more completely and precisely than a single number like pull force or surface field. Neodymium magnets are sensitive to heat. Price - Chart - Historical Data - News. A Neodymium (Rare Earth) magnets Grade (eg:N42) is an accurate guide to the strength of a magnet. 763-540-9497 – Learn about the different types of magnets, their properties and common uses from US Magnetix and help determine if a neodymium or ceramic magnet is right for your project. e. Permeability is typically represented by the (italicized) Greek letter μ. The major application of neodymium is in high-strength permanent magnets based on Nd 2 Fe 14 B that are used in high-performance electric motors and generators,. 76. Mounting Magnets are strong neodymium magnets that are set inside a steel cup or channel. Neodymium compounds are of low to moderate toxicity, yet its toxicity has not been thoroughly investigated. N42 grade offers a high performance. N52 magnets are approximately 50% stronger than N35 magnets. The necessary. Maximum energy product, also referred to as BHmax is. Magnets don't pull with any lateral force when stuck to a steel plate. For example, each Toyota Prius is reported to contain as much as 1 kg of neodymium in its motor. If you took the magnet out of a Mounting Magnet, you might only see half the pull force that you had fully assembled. In terms of dollars spent per pound of pull force, they can be a better value than a plain magnet. Resulting Force (lbf): Neodymium Magnetic Pull Force Calculator calculates expected pull forces based on a single magne testing. Neo magnets can be found in a variety of applications including high performance motors, brushless DC motors, magnetic separation, magnetic resonance imaging, sensors, switches. At first4magnets. 70 per kg on Jan 1st 2021 it has increased +14. Our neodymium mounting magnet selection features – countersunk, counterbored, threaded male and female studs, and hook magnets in standard and metric sizes. Double the N number and you get. All Surface Field values are at the magnet surface, in the center of the axis of magnetization. Zeller & J. These magnets can then sliced into smaller magnets or ground to tighter tolerances. Available. Our Superiority: Customized is Available! * T/T, L/C, Paypal and other payment accepted. DIYMAG strong neodymium are made of. As gravity tries to pull the magnet down, the friction between the magnet and the door prevents it from sliding. 11% of their magnetism for every 1 degree celsius rise in temperature. 5550 FOR A FREE QUOTE. The neodymium disc magnet is in the group of rare earth magnets, the strongest type of permanent magnet available today. Box Package, SCB250. These indicate maximum working temperatures (we use celsius temperature), which range from M (up to 100 °C) to AH (220 °C). The number comes from the Maximum Energy Product of the magnet material, expressed in MGOe (Mega Gauss Oersteds). 200℃ (392℉) Neodymium Magnet ( also called Neodymium Iron Boron Magnet, Strong Magnet) can be supplied in different grade and size. Select Material Grades for Neodymium Magnets When you are trying to figure out which neodymium magnets to select for your design needs, you. Here I would like to mention an experiment done by. Available in disc and cylinder shapes, Neodymium magnets have magnetic properties that far exceed all other permanent magnet materials. The magnetic field of a neodymium magnet reaches about 1. A round neodymium magnet with a diameter of 20mm and a thickness of 3mm has a pull force of approximately 3. One special advantage they have is that they are corrosion resistant and very easy to magnetize, making them the first choice for a lot of consumers, industrial, technical and commercial applications. Most of our magnets are grade N40 so if they are heated above 80˚C or 176˚F they will demagnetize and lose their strength.