MIN CI 100 Pcs Strong Magents, 30 mm x 2 mm Neodymium Magnet Disc with Double-Sided Adhesive, Round Rare Earth Magnets Heavy Duty, for Whiteboard Scientific Models Office Fridge
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Availability:
17 left in stock
Arrives
Thursday, Oct 9
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Size: 30mm x 2mm 100pack
Features
- Strong Magnets: Neodymium magnets strong have big suction, there are a variety of sizes to meet your needs. Diameter 30 x 2 mm, pack of 100
- Performance Magnets: Rare earth magnets heavy duty are made of rare earth materials. The disc magnets strong coated with a three-layer Ni+Cu+Ni plating process
- Easy To Use: Strong magnets heavy duty can be attached to any surface with adhesive or directly to metal surfaces, and magnets do not leave marks or stains
- Multipurpose Magnet: Heavy duty magnets are used to hang and fix various metal tools, and organize various metal objects. Magnets round are suitable for workshop woodworking, garages, crafts, whiteboards, refrigerators, and more
- What You Get: Neodymium disc magnets x 100 pcs, double-sided adhesive x 100 pcs. Magnets of various sizes are available
Material: Neodymium
Brand: MIN CI
Shape: Round
Number of Pieces: 100
Manufacturer: MIN CI
Package Dimensions : 5.83 x 4.13 x 3.35 inches; 2.48 Pounds
Date First Available : November 15, 2023
Manufacturer : MIN CI
Best Sellers Rank: #1,291 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #16 in Rare Earth Magnets
#16 in Rare Earth Magnets:
Customer Reviews: 4.4 4.4 out of 5 stars 2,052 ratings
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If you place your order now, the estimated arrival date for this product is:
Thursday, Oct 9
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View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 18mm x 3mm 40pack
I have worked with quite a few ultra-powerful neodymium magnets in the past 3 years, some of which are outright dangerous if handled recklessly, such as strong enough to crush fingers that get in the way, or outright lift refrigerators and small steel engine blocks. This is not one of those kind of magnets, but I still treat all neodymium permanent magnets with respect for safety. This was the perfect size to replace the anemic weak magnet in the antenna for a cellular network access "fail-over" device, so it would stay put on a vehicle or in a portable application in high winds. The original antenna underwent "sudden violent separation" from a car roof, followed by high velocity contact with the highway surface and dragging by its attached coaxial cable, accompanied by multiple secondary impacts with pavement and the side of the car until the driver was able to come to a stop after about 400 feet. Pieces of debris from the antenna base were recovered from the highway, bagged, and taken home to see if there was any hope of repair; not due to the cost - only a $25 antenna - but the 6 to 8 weeks of supply chain delays to acquire a replacement. Following examination of the debris, it was quickly determined that the tiny magnet used in the base during manufacture was woefully inadequate to hold it to the roof of a vehicle at highway speeds. A small mold was made to replicate the shape of the plastic base, the recovered fragments were placed approximately where they would have been before the accident, the metal parts were verified to still have electrical and RF integrity, and a small amount of resin was poured to reconstruct the base. The steel cup in which the original magnet had been placed, was measured for inside bottom diameter, as was its depth with a machinist's gauge. With sufficient cup clearance calculated to maximize magnetic field strength out of the bottom, these magnets were selected and ordered as the best fit and likelihood of sufficient strength to upgrade the base holding force to an acceptable performance level in the field. While the magnets were en route, the antenna system was tested with a rather expensive microwave antenna and feedline analyzer, and determined to be still functional within the cellular 4G spectrum. The empty cup was filled with JB Weld epoxy (which although it contains steel powder and is slightly magnetic, does not divert more than a few percent of magnetic flux). This was used to "pot" the magnet so when removing the modified rebuilt assembly from a car roof, it will stay firmly attached to the antenna and not the car. 24 hours later once the epoxy had fully cured, the repaired unit was placed on the car roof, with a camera anchored nearby to observe it. The antenna analyzer was connected to the coax, and set up to monitor impedance and reflected energy in the center of the 4G cellular spectrum, and the unit was taken on a test drive. The first leg consisted of about 2 miles of incredibly rough dirt road, which subjected the unit to extreme vibration, which should induce microscopic very fast separation and gap closure over millisecond intervals, which can cause data errors and "chopping" of voice over IP. The magnet was strong enough no significant signal degradation was observed. The second leg was about 4 miles of secondary road at between 35 and 50 mph. The final leg was 10 miles out and 10 miles back of highway between 75 and 80 mph to observe aerodynamic behavior and the magnet's ability to overcome these forces. The magnet passed with flying colors. Most people won't use them for this, but it worked well. I'm going to put another one in a TV remote so it stays put on a steel cabinet when not in use, and the cats can't hide it under furniture.
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Reviewed in the United States on August 1, 2023 by John Galt
Size: 18mm x 3mm 40pack
These magnets are perfect for creating crafts that 'stick'! Very strong and reasonable. Also, delivered on time and are exactly what the advertising said.
Reviewed in the United States on August 21, 2025 by David R.
Size: 18mm x 3mm 40pack
They are very strong and hard to separate. But I needed them to be strong, so we’re a good buy.
Reviewed in the United States on September 11, 2025 by Neri
Size: 10mm x 3mm 100pack
I've started to make some 3D printable toolbox organizers. They need the strongest magnets available to work over liners and keep tools from sliding around when opening/closing drawers. I had some strong 10x3mm magnets that worked great, so I designed the holders with pockets for that size magnet. These magnets are the same size as my old ones, but only a third of the strength. It held up about a pound from the tip of a wrench. (And would hold more weight if using the full surface area) Wich is pretty good for most applications. However, the old magnet held about 3lbs and that's what I was looking for. I spent many hours going through all the 10x3mm magnet reviews. This is one of the only ones that didn't have people complaining about the thickness being around 2.7mm instead of 3mm. I wish all sellers were required to list the actual dimensions (not just pictures of a micrometer showing the advertised dimensions) and the N rating of magnets. It's hard to believe no one on Amazon sells true 10x3mm N52 magnets.
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Reviewed in the United States on January 20, 2025 by Adam Wilson Adam Wilson
Size: 20mm x 3mm 30pack
Super strong flat magnets
Reviewed in the United States on October 1, 2025 by Timothy S. Johnson
Size: 20mm x 3mm 30pack
The magnets worked. Be very careful when working with them they can snap together and crack
Reviewed in the United States on September 28, 2025 by Mark thibault
Size: 18mm x 3mm 40pack
Strongest magnets I have ever seen and it worked on my project but they were hard to separate and several of them broke in pieces. Having said that it worked for me!
Reviewed in the United States on August 10, 2025 by Amazon Customer
Size: 15mm x 3mm 50pack
Super strong magnets! Just as I hoped!
Reviewed in the United States on September 1, 2025 by neva lewis