Rare Earth

Neodymium Rare Earth Magnets

Permanent Neodymium Magnets for Science, Engineering, Crafts

Neodymium Rare Earth Magnets

Fully sintered, High tolerance neodymium rare earth disc, rod magnet & ring magnets, N42 grade, 13,200 gauss, 80C for relays, sensors, switches, nanotechnology, hobbies and much more.

Every magnet is guaranteed for size & strength with on-line Drawings, Certificates of Compliance, MSDS, ROHS & Hysteresis graphs.

There is no minimum order so buy just one of any size for prototyping or buy just 10+ to get volume pricing.

Neodymium magnets, also known as NdFeB magnets, are the most popular type of rare-earth magnet having replaced samarium cobalt. It is a ceramic magnet made from neodymium, iron and boron with other metals such as dysprosium. Neodymium magnets are the strongest commercially available permanent magnets and are used in applications ranging from motors to sensors to magnetic clasps.

Indigo Neodymium magnets, are N42, rated at 13,000 gauss1, with a ± 5% variance 2, ideal.for reproducibility. Most of our sizes are "hard" metric done in multiples of 2.5mm to make prototyping straightforward. American sizes and other grade are readily available as custom orders.

Note (1): N42 are 13,200 gauss typical but 13,000 is guaranteed.
Note (2): N42 & other grades can be specified to meet a ± 2% variance on special order.

More Information

What Customers Say About our Neodymium Magnets

[Actual reviews done on Google Places]

Roman Teliszczuk: Purchased neodymium magnets for work. The quality, price, packaging and delivery were excellent. I highly recommend Indigo Instruments.

Mark Elliott: Great website especially the dimensional and polarity information. Magnets arrived quickly and were as expected. Used to replace weak door alarm sensor magnets.

Ron Bennett: Fantastic support and product. Beats Amazon price with real customer service. After online order was placed, they called and and asked if I had any questions and gave clear instructions on pickup process. Order was ready and in stock and the product was of the highest quality and exactly as described. Will buy other items from Indigo instruments.

Ian Kelly: I've dealt with Indigo Instruments for years now. They have always been personable and very knowledgeable. Most recently I sent them a hand-drawn sketch of my interpretation of something I saw on YouTube and wanted recommendations on what magnets to use. Chris called me up, discussed the project and made some recommendations. His recommendation was bang on. I couldn't be happier with the end product.

Tracy Myerson: Super fast shipping, excellent prices, and great quality product! I purchased N42 Neodymium magnets, they are the real deal. I had previously bought magnets on Amazon that were advertised as N52, they were just another cheap Chinese fake. These folks sell authentic, high quality stuff and get it to you fast. Highly recommended!

Brenda McIntyre: love these guys, high quality, quick service and reasonable pricing!!

Peter Maran: Been doing business with Indigo for many years. Their Neodymium magnets are superb in quality and price. Other items, tools, magnifiers, tweezers, and so on, all quality made withstanding the test of time.

Specifications for Fully Sintered/Pressed
Neodymium Magnets, N42 Grade
Flux Density


Energy Product




13,000G; 1300mT 12.0 Oe; 955 A/m 17.0 Oe; 1353 A/m 42 MGO; 334 kJ/m3 310oC 80oC -0.12%/Co

Specifications for Fully Sintered/Pressed
Neodymium Magnets, N42 Grade

RemanentFlux Density
13,000G; 1300mT
12.0 Oe; 955 A/m
Intrinsic Coercivity
17.0 Oe; 1353 A/m
Max.Energy Product
42 MGO; 334 kJ/m3
Curie Temperature
Working Temperature

Imperial/Metric Conversion Table

Inch Decimal mm Rounded
1/32" 0.031 0.8 1
3/32" 0.094 2.4 2.5
5/32" 0.156 4.0 4
1/16" 0.063 1.6 1.5
3/16" 0.188 4.8 5
2/10" 0.200 5.1 5
1/8" 0.125 3.2 3.75
1/4" 0.250 6.4 7.5
5/16" 0.313 7.9 7.5
3/8" 0.375 9.5 10
13/32" 0.406 10.3 10
1/2" 0.500 12.7 12.5
9/16" 0.563 14.3 15
5/8" 0.625 15.9 15
11/16" 0.688 17.5 17.5
3/4" 0.750 19.1 20
13/16" 0.813 20.6 20
7/8" 0.875 22.2 22.5
15/16" 0.938 23.8 25


Tolerances Sintered Rare Earth Magnets
  Dimensions Tolerances

Unfinished Surfaces:
Dimensions perpendicular to pressing (die formed)

Inches mm Inches mm
0 to 0.125 0 to 3 +/- 0.006 +/- 0.15
0.126 to 0.625 3 to 16 +/- 0.012 +/- 0.30
0.626 to 0.875 16 to 22 +/- 0.018 +/- 0.45
0.876 and Up 22 and Up +/- 2.5% +/- 2.5%



Safety Warning: Handle with Care!

  • Separate by sliding apart & keep well apart
  • Neodymium magnets are strong and can snap together if brought into close poximity
  • Neodymium magnets are brittle and can shatter on impact if they snap together
  • Neodymium magnets can break skin or bones if caught between magnets that snap together
  • Should be kept out of reach of children
  • Can damage computer gear & credit cards